Improper handling-resistant wrapping film capable of withstanding sterilisation in autoclave, having oxygen impermeable layer and containing mixture of amorphous polyamide and polycrystalline polyamide

FIELD: chemistry.

SUBSTANCE: method involves: (A) putting a product in a packing article, containing a multilayer wrapping film welded onto itself, (B) heat sealing the closed product so that the product is surrounded by the multilayer wrapping film; (C) heating the packed product to temperature of at least 212°F for at least approximately 0.5 hours, where heating takes place in the presence of vapour under pressure. The multilayer wrapping film contains: (1) a cross-linked first outer layer which serves as an insulating layer and the in contact with the product, and (2) a cross-linked O2-impermeable layer containing a mixture of: (i) 50-95 wt % in terms of the weight of the mixture of amorphous polyamide, which contains at least one polyamide selected from a group comprising PA-6I/6T; PA-MXD,I/6,I; PA-6/6,T; PA-6/6I; PA-6,6/6,I; PA-6,6/6,T; and (ii) polycrystalline polyamide which contains at least one polyamide selected from a group consisting of (a) 5-50% of the weight of the PA-MXD,6/MXD,I mixture and (b) 5-15% of the weight of the mixture, polyamide with or without a nucleating agent, having reduced viscosity measured in accordance with the ISO 307 test method from 150 ml/g to 245 ml/g.

EFFECT: obtaining a packed food product sterilised in an autoclave and having a long shelf life.

11 cl, 2 ex, 2 tbl, 2 dwg

 

The technical field to which the invention relates

The present invention relates generally to packaging films and, more specifically, to packaging films suitable for packaging food products, which are subjected to sterilization in an autoclave, the inside of the package.

Background of the invention

Packages made from the films or laminates comprising such polymers as polyethylene or polypropylene, are used in many areas. Such packages are used for the maintenance of low viscosity liquids such as juice and soda water), high-viscosity liquids (for example, dressings and sauces), mixtures of liquid/solid (e.g., soups), jellies, powders and powder materials. The advantage of such packages is, at least partly, in the fact that these packets are easy to store before filling, and the fact that they produce very little waste for disposal. Packages can be produced in various shapes and sizes.

Packages can be formed from films, laminates or sheet materials using a vertical form-fill-sealing machines (VFFS). These machines accept a film, laminate or sheet material and process this material to give it a desired shape. For example, one or more films, laminates, and/or sheet materials is to hepatica and linked so that in order to obtain the desired shape. After obtaining the shape of the edge of the sealed package and the package is filled. Usually a film, laminate or sheet material with at least one heat sealable layer or a sticky surface that allows you to glue the edges with the application of heat.

In the process of welding a portion of at least one edge of the package is not closed before filling the package. The package is filled through the open part and then unclosed part of the brew. Alternatively, you can fill the package and simultaneously close nesavainotu part, to obtain a closed package with a minimum free space. The way VFFS known to specialists in this field and are described, for example, in patent US 4589247 (Tsuruta and others)entered as the reference. Liquid product is introduced through the Central vertical filling pipe formed in the tubular film is sealed transversely at the lower end and along. Then the formation of a complete package, brewing the upper edge of the tubular segment and severing the package from the tubular film above the welding point.

As a copolymer of ethylene vinyl alcohol (EVOH), and other polymers such as polyamide, can give a film with a high kislotonepronitsaemost, so that the resulting packaged product has a relatively long shelf life. Problems arise when filled with the initial package is subjected to autoclaving conditions. However, the sterilized film should also include outer layers, which serve termosvarivaemaya layers, and these layers usually contain polyethylene or a copolymer of ethylene and alpha-olefin. Usually the layers are films made of polyolefins such as copolymers of ethylene and alpha-olefin, difficult to stick to kislorodopronitsaemaya layer made of EVOH or polyamide. The result should be a layer of adhesive polymer, such as anhydride grafted linear low density polyethylene.

When autoclave sterilization of Packed food products is important to have a package that has a long shelf life. This is achieved by using a film having, among other properties, O2-impermeable layer, providing a low transmission rate of atmospheric oxygen. It is known that amorphous polyamides provide a good barrier to atmospheric oxygen. The thicker the layer of amorphous polyamide, the lower the transmission rate of atmospheric oxygen through the film. It would be desirable to provide a withstand sterilization in an autoclave film that provides long-term storage and which has a barrier layer containing an amorphous polyamide.

The essence of the invention

It has been found that can withstand sterilization in an autoclave multilayer film having O2-impermeable layer, with the present of amorphous polyamide, has an undesirable lack of resistance to cracking when bending and lack of resistance to shock. These defects occur in a wide temperature range, since the glass transition temperature (Tg) amorphous polyamides is generally at least 80°C.

It has been found that by mixing a semicrystalline polyamide with an amorphous polyamide oxygen-proof layer exhibits superior resistance to cracking when bending and damage of the shock influences such as the impact of the fall.

In the first aspect of the present invention relates to withstand sterilization in an autoclave multilayer packaging film containing crosslinked first outer layer, which is welded layer and a layer in contact with the product, and sewn On2-impermeable layer. O2-impermeable layer comprises a mixture of (i) from 50 to 95 weight percent, based on the weight of the mixture of amorphous polyamide with a glass transition temperature from about 80°to about 200°C, and (ii) a semicrystalline polyamide. Semi-crystalline polyamide contains at least one member selected from the group consisting of: (a) from 5 to 50 percent by weight of a mixture of PA-MXD, 6/MXD, I; and (b) from 5 to 15 percent by weight of a mixture of polyamide with or without nuclei of crystallization, having a given viscosity from 150 milliliters per gram is about 185 milliliters per gram, measured according to international standard ISO test method 307. Test method ISO 307, fourth edition, 2003-08-15, the name "shows the Definition of viscosity plastics-polyamides", copyright International organization for standardization imposed by reference in its entirety.

In a preferred embodiment, the implementation of the amorphous polyamide contains at least one member selected from the group consisting of PA-6I/6T; PA-MXD, I/6,I; PA-6/6,T; PA-6/6,I; PA-6,6/6,I; PA-6,6/6,T, PA-6,3/T.

In a preferred embodiment, the implementation of polyamide with or without germ crystallization contains at least one member selected from the group consisting of PA 6; PA 6,12; PA-6,10 and PA-6/6,9.

In a preferred embodiment, the implementation O2-impervious layer has a thickness of from about 7 microns to about 25 microns, and after autoclaving for 90 minutes at 250°F film detects bandwidth O2at 100%relative humidity on both sides of the film from about 5 to about 25 cm3/m2/day.

In a preferred embodiment, the implementation O2-impervious layer has a thickness of from about 7 microns to about 25 microns, and after autoclaving for 90 minutes at 250°F film detects bandwidth O2at 100%relative humidity on both sides of the film from about 10 deprimere 20 cm 3/m2/day.

In a preferred embodiment, the implementation O2-impermeable layer comprises a mixture of from 50 to 95 weight percent, based on the weight of the mixture of PA-6I/6T and at least one member selected from the group consisting of: (a) from 5 to 50 percent by weight of a mixture of RA-MXD and (b) from 5 to 15 percent by weight of a mixture of PA-MXD,6/MXD,I.

In a preferred implementation withstand sterilization in an autoclave multilayer packaging film contains, in addition, a second outer layer which is crosslinked and which serves as an upper layer and thermovalve layer.

In a preferred implementation stitched the first outer layer comprises a mixture of: (1) at least one member selected from the group consisting of: (a) homogeneous copolymer of ethylene and octene having a density of from about 0,905 g/cm3to about 0,93 g/cm3(b) homogeneous copolymer of ethylene and butene having a density of approximately 0.90 g/cm3to about 0,93 g/cm3and (c) homogeneous copolymer of ethylene and hexene having a density of approximately 0.90 g/cm3to about 0,93 g/cm3; and (2) at least one member selected from the group consisting of: (a) a heterogeneous copolymer of ethylene with alpha-olefin, having a density of from about 0,92 g/cm3to about 0.95 g/cm3[0,92-0,94], and (b) a copolymer of propylene with atilano is with a melting point from about 110°C to about 150°C, and with from 0.1 to 0,49% by weight of ethylene units.

In a preferred embodiment, the implementation of the crosslinked second layer comprises a mixture of isotactic polymer based on propylene and homogeneous copolymer of ethylene with C4-8alpha-olefin, having a density of from about 0,86 g/cm3to about of 0.91 g/cm3. Isotactic polymer based on propylene could be homopolymer propylene or a copolymer of propylene. Isotactic polymer based on propylene may also be a copolymer of propylene with ethylene and may be a copolymer of propylene with C4-20alpha-olefin. Preferably, the polymer based on propylene and has a melting point of at least 125°C, so that the film is easily separated from the metal autoclave grid. Although the polymer based on propylene may be heterogeneous or homogeneous, preferably a polymer based on propylene is a homogeneous polymer. Preferably, the polymer based on propylene has a density of from about 0,86 to approximately 0.90 g/cm3more preferably from about 0.88 g/cm3up to approximately 0.90 g/cm3.

In a preferred embodiment, the first outer layer contains, in addition, additive, reducing friction, and a parting agent, and the second outer layer also contains, in addition, additive, reducing friction, and parting agent.

In a preferred embodiment, the implementation of the crosslinked first layer comprises a mixture of: (i) homogeneous polymer based on propylene and (ii) a homogeneous copolymer of ethylene with C4-20alpha-olefin, having a density of from about 0,86 g/cm3to about of 0.91 g/cm3preferably from about 0.88 g/cm3to about 0,905 g/cm3.

In a preferred variant of realization of the polymer based on propylene and has a melting point of from 110°C to 150°C. Preferably, the polymer based on propylene is syndiotactic polymer based on propylene, having a density of from about 0,86 g/cm3to about 0.87 g/cm3. In a preferred implementation syndiotactic polypropylene has a melting temperature of 130°C and a density of 0.87 g/cm3.

In a preferred variant of realization of the polymer based on propylene contains isotactic polymer based on propylene having a melting point from about 110°C to about 150°C. Preferably, the isotactic polymer based on propylene is homogeneous polymer having a melting point of from about 125°C to about 150°C and has a density of from about 0.85 grams/cm3up to approximately 0.90 g/cm3.

Preferably, the homogeneous ethylene copolymer with C4-20the alpha-olefin contains a copolymer of ethylene and butene having latest from about 0.88 g/cm 3to about 0,905 g/cm3.

In a preferred embodiment, the first outer layer contains, in addition, additive, reducing friction, and a parting agent, and the second outer layer contains, in addition, additive, reducing friction, and parting agent.

In a preferred implementation withstand sterilization in an autoclave multi-layer film includes, in addition, made butter and irestone layer containing at least one member selected from the group consisting of: (i) crystalline grafted anhydride copolymer C2-3/C6-20alpha-olefin, having a density of from about 0,93 g/cm3to 0.97 g/cm3(ii) a crystalline copolymer of butene with C2-3alpha-olefin, having a density of at least 0,92 g/cm3, (iii) ionomer resin and (iv) a copolymer of ethylene with an unsaturated acid.

In a preferred implementation withstand sterilization in an autoclave multilayer film contains, in addition, the first resistant to deterioration at high temperatures, the layer between the first outer layer and O2-impermeable layer and the second resistant to deterioration at high temperatures, the layer between the O2-impermeable layer and the upper layer, each resistant to deterioration at high temperatures, the layer contains a polymer with Tgfrom about 50°C to 125°C. is preferred in which the Rianta implement at least one of the layers, resistant to deterioration at high temperature, contains a mixture resistant to deterioration at high temperature polymer with at least one polymer that is resistant to damage at moderate temperatures selected from the group consisting of polyamide-6/6,6, polyamide-6,12, polyamide-6/6,9, polyamide-12, polyamide-11.

In a preferred implementation withstand sterilization in an autoclave multi-layer film includes, in addition, at least one layer that is resistant to damage at moderate temperatures, which contains at least one resistant to damage at moderate temperatures the polymer, with Tgfrom about 16°to about 49°C. Preferred polymers that are resistant to damage at moderate temperatures, include polyamide-6/6,6, polyamide-6,12, polyamide-6/6,9, polyamide-12, polyamide-11.

In a preferred implementation withstand sterilization in an autoclave multilayer film contains, in addition, the first resistant to damage at low temperature layer between the first outer and O2-impermeable layer and the second resistant to damage at low temperatures, the layer between the O2-impermeable layer and the top layer, each resistant to damage at low temperatures, the layer contains a polymer with Tgto 15°C. Preferably, the first and resistant to deterioration at high temperature layer, and the second condition is stable to deterioration at high temperature layer include at least one member, selected from the group consisting of a semicrystalline polyamide containing at least one member selected from the group consisting of polyamide-6, polyamide-6,6, polyamide-6,9, polyamide-4,6 and nylon-6,10. Preferably, first and resistant to damage at low temperature layer, and the second is resistant to damage at low temperature layer include at least one member selected from the group consisting of olefin homopolymer, copolymer With2-3/S3-20alpha-olefins and anhydride grafted copolymer of ethylene and alpha-olefin.

In a preferred embodiment, the implementation of the multi-layer film contains, in addition: (A) the adhesive layer between the O2-impermeable layer and the upper layer, and the adhesive layer contains at least one member selected from the group consisting of anhydride grafted copolymer of ethylene and alpha-olefin, ionomer resin, a copolymer of ethylene with an unsaturated acid; and (B) crosslinked oil - and irestone layer between the first outer layer and the first resistant to the wrong treatment at a low temperature layer, and oil and irestone layer includes at least one member selected from the group consisting of: (i) crystalline grafted anhydride copolymer C2-3/C6-20alpha-olefin, having a density of from about 0,93 g/cm3to 0.97 g/cm3(ii) Chris is alicebraga copolymer butene/S 2-3alpha-olefin, having a density of at least 0,92 g/cm3, (iii) ionomer resin and (iv) a copolymer of ethylene with an unsaturated acid.

In the second aspect of the present invention is directed to sterilisable in an autoclave packaging article containing multilayer packaging film, sealed with sealing. Multi-layer film corresponds to the first aspect of the present invention.

In a preferred implementation withstand sterilization in an autoclave multilayer packaging film contains, in addition, a second outer layer which is crosslinked and which serves as an upper layer and thermovalve layer.

In a preferred implementation, the outer heat sealable layer is welded to itself.

In another preferred embodiment, the implementation can withstand sterilization in an autoclave multilayer film contains, in addition, a second outer layer, which serves as thermovalve layer and the upper layer, and the first outer layer is welded to the second outer layer (for example, a seam in the overlap).

In a preferred implementation sterilized in the autoclave packaging the product is sealed by sealing with the formation of element selected from the group consisting of a package, glued on the end of the package, glued side of the package with an adhesive seam in view of the letter L, package with U-shaped glue line package with gusseted, package, glued lap on form-fill-sealing machine, batch, glued together at the edges to form-fill-sealing machine, standing steadily package and shell.

In a preferred implementation sterilized in the autoclave packaging the product has less than 19% of current packages when filled with water, sealed plugging and autoclave at 250°F for 90 minutes and subsequent testing on a shaker in accordance with ASTM 4169 Assurance Level II within 30 minutes of shaking.

In the third aspect of the present invention is directed to sterilisable in an autoclave Packed product containing the product, is surrounded by a multilayer packaging film, heat sealing by sealing. Multilayer packaging film corresponds to the first aspect of the present invention.

In the fourth aspect of the present invention is directed to a method of obtaining sterilized in the autoclave packaged product, comprising: (A) placing the product in the packaging article containing multilayer packaging film, heat sealing by sealing; (B) sealing a closed product, so the product is surrounded by a multilayer packaging film; and (C) heating the packaged product to a temperature of at least 212°F for men is her least about half an hour. Multilayer packaging film corresponds to the first aspect of the present invention.

In a preferred implementation, the product contains at least one member selected from the group consisting of chili, rice, beans, olives, beef, pork, fish, poultry, corn grain, eggs, tomatoes and nuts. The product can be any food, i.e. meat, chicken broth, products, tomato-based, etc.

In a preferred embodiment, the implementation of the Packed product warm at a temperature of at least 230°F for at least about 75 minutes.

In a preferred embodiment, the implementation of a food product in the package has a weight of from about 0.5 to about 10 pounds, preferably from about 3 to about 5 pounds.

Brief description of drawings

Fig. 1 is a schematic cast manufacturing process can withstand sterilization in an autoclave multilayer film in accordance with the present invention.

Fig. 2 is a histogram illustrating the results of the test trials in the fall for the films of examples 1, 2 and 3.

Detailed description of the invention

Used the verb "to be autoclaved" refers to sterilization products, such as packaged food product at high temperature (i.e. from 212°F to 300°F) for a period of from about 10 minuto 3 hours or more in the presence of water, steam or steam under pressure. Used here, the expression "withstand sterilization in an autoclave film" refers to a packaging film that can be formed into a package, filled with the oxygen-sensitive product, thermocline and autoclaved without delamination of film layers. The autoclaving process is also carried out at elevated pressures. Usually the process of autoclaving is carried out at the premises of the packaged products in the environment, the pressure is increased to approximately 20-100 f/inch2. In another embodiment, from 30 to 40 F./inch2.

Used here, the term "film" includes plastic material, regardless of whether it is film or sheet. Preferably, the film according to the present invention and used in the present invention have a thickness of 0.25 mm or less. Preferably, withstand sterilization in an autoclave film according to the present invention has a thickness of from about 2 to 15 mils, more preferably from 4 to 8 mils.

Preferably, the film of the present invention is as fully sextravaganza film, i.e. all layers of the film emerge simultaneously from a single extrusion head. Preferably, the film is made with the use of the technological process of casting of flat films or process is casting all films. Alternatively, the film can be made by blowing film.

Multi-layered to withstand sterilization in an autoclave film according to the present invention can be heat shrinkable or netermousadochnymi. Shrink film may be uniaxial orientation or biaxial orientation. Used here, the expression "shrink" refers to films that are different full free shrinkage (i.e. in the machine direction and transverse) of at least 10% at 185°F, as measured by ASTM D 2732, which is introduced by this reference in its entirety. If the film is heat shrinkable film can be temperature stabilized at manufacturing. All films with full free shrinkage of less than 10% at 185°F, called here heteroscedacity.

Used here, the term "package" refers to the packaging material surrounding the packaged product. The expression "packaged product", as used here, refers to the combination products, which is surrounded by the packaging material.

Used here, the expression "inner layer" and "inside layer" refers to any layer of a multilayer film, in which both main surfaces directly stuck with another layer of the film.

Used here, the phrase "outer layer" refers to any of lanocreme layer film, in which at least two of its main surfaces directly stuck with another layer of the film. This expression includes single and multilayer films. In multilayer films, there are two outer layers, each of which main surface is stuck with only one other layer of the multilayer film. In single-layer films, there is only one layer, which, of course, is the outer layer, since none of its major surfaces are not stuck with another layer of the film.

After withstanding sterilization in the autoclave multilayer film brewed and thereby converted into a packaging product, one external layer of the film is the inner layer of the product, and the other outer layer becomes the outer layer of the product. The inner layer may also be called the "outer thermovalve/product contact layer. The other outer layer may be called "external thermovalve/upper layer.

Used here, the expression "inner layer" refers to the outer layer of the multilayer film, in which a packaged product that is closest to the product in comparison with the other layers of the multilayer film.

Used here, the phrase "outer layer" refers to the outer layer of the multilayer film, in which a packaged product that is furthest from the product compared to others is the other layers of the multilayer film. Similarly, outer surface of the package is a surface facing outward from the product packaged in this package.

Used here, the term "stuck" includes a film that is directly stuck to each other as a result of application of thermocline or other means, as well as films that are glued together with a glue between two films.

Used here, the phrase "sealant layer", "adhesive layer", "heat sealable layer and sealing layer" refers to the outer layer or layers of film, involved in heat-sealable film itself to itself, another film layer of the same or another film, and/or other object that is not a film. * Heat sealing can be performed by any one or more of a variety of methods, such as methods of heat sealing (for example, welded extruded rod, sealing, impulse welding, ultrasound welding, hot air, hot wire, infrared radiation and so on). In a preferred method of welding is used the same apparatus for welding a double rod, which is used in the examples given here to obtain a compression seal. The welded seam is relatively narrow seam (for example, a width of from 0.02 inches to 1 inch), running through the film.

Use Zoumana here the expression "irestone layer" refers to a film layer, which is resistant to grease, fat and/or oil, i.e. to a layer which does not swell and delamination between adjacent layers under the action of grease, fat and/or oil in the autoclave packaging made using film. The ability of the film to resist fat when autoclaving is measured by the packaging film food with high fat content (e.g., corn oil, Chile and so on), followed by sterilization of the Packed product in the autoclave. Sterilized packaging examined immediately upon completion of the sterilization cycle, to determine whether there was any separation of the layers. In the absence of stratification, the product is removed for storage and a week later checked again and then every two weeks, in total, at least 5 weeks from the date of sterilization. If visible signs of delamination no, the film is grease-resistant film.

Used here, the expression "layer, resistant to deterioration at high temperature" refers to a film layer containing a polymer capable of making a significant contribution to the resistance to deterioration when packaging incorrectly treated in the temperature range from about 60°C to about 180°C. the Polymer is able to provide resistance to deterioration at high temperatures, are polymers with Tgfrom about 50°C to 125°C. the Preferred p is the materials to obtain resistance to deterioration at high temperature include semi-crystalline polyamides, in particular polyamide-6, polyamide-6,6, polyamide-6,9, polyamide-4,6 and nylon-6,10.

Used here, the expression "layer, resistant to damage at moderate temperatures" refers to a film layer containing a polymer capable of making a significant contribution to the resistance to deterioration when packaging incorrectly treated in the temperature range from about 20°C to about 60°C. the Polymers capable of resistance to damage at moderate temperatures, are polymers with Tgfrom about 16°C to 49°C. Preferred polymers to provide resistance to damage at moderate temperatures include polyamide-6/6,6, polyamide-6,12, polyamide-6/6,9, polyamide-12, polyamide-11.

Used here, the expression "layer, resistant to damage at low temperature" refers to a film layer containing a polymer capable of making a significant contribution to the resistance to deterioration when packaging incorrectly treated in the temperature range from about -50°C to about 20°C. the Polymers capable of resistance to damage at low temperatures, are polymers with Tgto 15°C. Preferred polymers to provide resistance to damage at low temperatures include the olefinic homopolymers, copolymers With2-3/S3-20alpha-olefins and anhydride grafted ethylene copolymer and the LLF-olefin.

One standard for measuring the resistance to damage for a package containing a fluid or granular material is ASTM D 4169 Standard Practice for Performance Testing of Shipping Containers and Systems", which is hereby introduced as reference in its entirety. Of particular interest to him are "12. Schedule D - Stacked Vibration and Schedule E - Vehicle Vibration", and more specifically, Assurance Level II. These test methods evaluate the ability of the package to be subjected to vibrations of different frequencies in a long time, which can cause cracking at the bend film surrounding fluid or granular product, if the film does not have satisfactory resistance to vibration. This test simulates the transport of packaging, in particular road transport.

Another test for resistance to damage is known as the drop test. When testing withstand sterilization in an autoclave and autoclaved packaged product of the present invention, the drop test is preferably performed by a cast of 10 identical sterilized packages on a concrete floor from a height of three feet. After each drop packing examined to break the weld and the gap film, and after each drop is observed, the percentage of leaking packages, and flowing packing excluded. The number of remaining packages (i.e. from 0 to 10), multiplied by n is 10, is the percentage of packages that have passed the drop test.

Multi-layered to withstand sterilization in an autoclave packaging films of the present invention is preferably irradiated to cause the stitching all layers. Cross-linking of the polymer in the layer improves the ability of the film to withstand autoclaving. Preferably, all the multilayer film structure is sewn, and preferably cross-linking is initiated by exposure of the film. In the irradiation process, the film is subjected to processing by the energy irradiation, such as treatment by corona discharge, plasma, flame treatment, ultraviolet treatment, x-rays, gamma radiation, beta radiation and high-energy electrons, which causes the linking between molecules of the irradiated material. Irradiation of polymer films described in patent US 4064296 (BOKNSTEIN and others), which is hereby introduced by reference in its entirety. BORNSTEIN and others describe the application of ionizing radiation for crosslinking of the polymer present in the film.

Doses are described here in terms of units of ionizing radiation "happy", and one million pleased, also known as megarad, marked "Mr", or in terms of units of ionizing radiation kilogray (GSR), and 10 kilogray, as is well known to specialists in this area is 1 MP. The approach is based on the dose of irradiation by high-energy electrons is in the range from about 16 to 166 GSR, more preferably from about 40 to 90 kGy, and more preferably from 55 to 75 kGy. Preferably, irradiation is carried out using electron accelerator, and the dose is determined by the standard methods of dosimetry. Can be used with other accelerators such as the van de Graaff generator or a resonant Converter. Irradiation is not limited to electrons from the accelerator, as it can use any ionizing radiation.

Used here, the term "package" includes a package with a seam in the form of the letter L, packets with a side seam, the packets with the wrong stitch and bags. Package with a seam in the form of the letter L has an open top, the bottom weld seam, one side seam along the edge of the first side and seamless (i.e. folded, securepay) edge of the second side. Package with side seam has an open top, seamless bottom edge and along each of the two side edges is welded seam. Although the seams along the side edges and/or bottom edge can be on the very edge (i.e. the seams of the type usually called "welds cut"), preferably the seams are inside (preferably 1/4-1/2 inch, more or less) from the lateral edges of the package, and preferably made with application of the device for heat sealing impulse type, which uses the rod which is quickly heated and then cooled rapidly. Package symptom is night seam is a package, having an open top, welded seam running parallel to the length of the package in which the film package is welded or seam joining the ends of the material, or lapped seam, two seamless side edges and the bottom seam along the bottom edge of the package. The package is made of two films that are welded together along the bottom and along each side edge, resulting in a weld bead with the letter P. Several different types of packages described in the patent US 6790468 (Mize and others), entitled "Made of lining package and method of manufacturing", the content of which is hereby entered the link. In the patent Mize and other batch part of a package with lining does not include overlays.

The term "polymer"as used here, includes a homopolymer, copolymer, ternary copolymer, etc. "Copolymer" includes the copolymer, ternary copolymer, etc.

Used here, the phrase "heterogeneous polymer" refers to products of the polymerization reaction with a relatively wide distribution of molecular weight and relatively wide distribution in composition, i.e. typical polymers obtained, for example, with conventional catalysts of the Ziegler-Natta. Heterogeneous copolymers usually contain relatively wide range of lengths of chains and content of the comonomers. Heterogeneous copolymers have a molecular weight distribution Mw/Mn is higher than a 3.0.

Used ZV is camping the expression "homogeneous polymer" refers to products of the polymerization reaction with a relatively narrow molecular weight distribution and relatively narrow distribution of composition. Homogeneous polymers suitable for use in various layers of the multilayer film used in the present invention. Homogeneous polymers are structurally different from heterogeneous polymers that homogeneous polymers have relatively uniform sequence of comonomers within a chain, mirror the distribution of sequences in all circuits, and the proximity of the lengths of all chains, i.e. a narrower molecular weight distribution. In addition, homogeneous polymers typically get using metallocene catalysis or other catalysis with a single active site on the metal, and not with the use of catalysts of the Ziegler-Natta.

In particular, the homogeneous copolymers of ethylene with alpha-olefins can be characterized by one or more methods known to the person skilled in the art, such as molecular weight distribution (Mw/Mn, Mz/Mn, measure the width of the distribution (CDBI), and narrow range of temperature and melting behavior with a single melting point. Molecular weight distribution (Mw/Mn) is also known as the polydispersity can be determined by gel permeation chromatography. Homogeneous copolymers of ethylene and alpha-olefins suitable for use with this invention, generally have a Mw/Mn of up to 3, more preferably up to 2.7, more preferably from prima is but 1.9 to about 2.5, more preferably from about 1.9 to about 2.3. The measure of the width of the distribution (CDBI) of such homogeneous copolymers of ethylene and alpha-olefin will generally be higher than about 70 percent. CDBI is defined as the weight percentage of copolymer molecules having a content of co monomer in the 50 percent range (i.e. plus or minus 50%) of the median full molar content of co monomer. CDBI linear polyethylene, which does not contain comonomers, by definition, is 100%. The measure of the width of the distribution (CDBI) is determined according to the method lentago fractionation with increasing temperature (TREF). The CDBI determination allows to clearly distinguish between homogeneous copolymers (narrow distribution of composition assessed by CDBI values generally above 70%) from the commercially available polyethylenes, very low density (VLDPE), which usually have a wide distribution in composition, assessed by CDBI values generally less than 55%. The CDBI of a copolymer is easily calculated from the data obtained by the methods known in this field, such as luento fractionation with increasing temperature, as described, for example, in Wild et al., J. Poly. Sci. Poly. Phys. Ed., Vol. 20, p.441 (1982). Preferably, the homogeneous copolymers of ethylene and alpha-olefins have a CDBI greater than about 70%, i.e. CDBI from about 70% to 99%. Usually homogeneous copolymers of ethylene and alpha-Aleph is on in made with lining package of the present invention have a relatively narrow range of melting temperature compared to the "heterogeneous copolymers", i.e. polymers having a CDBI of less than 55%. Preferably, the homogeneous copolymers of ethylene and alpha-olefin differ essentially single melting point peak temperature of melting (Tm), defined by differential scanning calorimetry (DSC), from about 30°C to 130°C. Preferably, the homogeneous copolymer has a peak Tm according to DSC of from about 80°C to 125°C. is Used here, the phrase "essentially single melting point" means that at least about 80% of the material by weight corresponds to a single peak Tm at a temperature in the range from about 60°C to 110°C, and essentially, there are no significant fraction of the material having a high melting point, measured by analysis by DSC, above about 130°C. Measurement by DSC was carried out on the system thermal analysis Perkin Elmer System 7. The information reported about the melting represents the data on the secondary melting, i.e. the sample is heated with a programmed rate of 10°C/min to a temperature below its critical range. The sample was then again heated (second melt) with a programmed rate of 10°C/min higher melting peaks is harmful to the properties of the film, for example, leads to turbidity, and create a risk of significantly reducing the temperature of initiation of welding the finished film.

Homoge the hydrated copolymer of ethylene and alpha-olefin can be obtained, generally, the copolymerization of ethylene and any one or more alpha-olefins. Preferably, the alpha-olefin is a C3-C20alpha monoolefins, more preferably C4-C12alpha monoolefins, even more preferably C4-C6alpha monoolefins. Even more preferably, the alpha-olefin contains at least one member selected from the group consisting of butene-1, hexene-1 and octene-1, that is, 1-butene, 1-hexene and 1-octene, respectively. Most preferably the alpha-olefin contains octene-1 and/or a mixture of hexene-1 and butene-1.

Methods of obtaining and application of homogeneous polymers described in the patent US 5206075, patent US 5241031 and international application PCT/WO 93/03093, which are all hereby introduced as a reference in their entirety. Further details regarding the production and application of homogeneous copolymers of ethylene and alpha-olefins described in international publication PCT/WO 90/03414 and in international publication PCT/WO 93/03093, which both belong to Exxon Chemical Patents, Inc., as the applicant, and which are both hereby entered as a reference in their respective entirety.

Another type of homogeneous copolymers of ethylene and alpha-olefin described in the patent US 5272236 (LAI and others) and the US patent 5278272 (LAI and others), which both entered this as a reference in their respective entirety. Each of these patents is picavet essentially linear homogeneous branched copolymers of ethylene and alpha-olefin with a long chain, manufactured and sold by Dow Chemical company.

Used here, the expression "copolymer of ethylene and alpha-olefin" refers to such materials as linear low density polyethylene (LLDPE) polyethylene and very low and ultra low density (VLDPE and ULDPE); and homogeneous polymers such as the polymers produced with metallocene catalysts, such as resin EXACT®, manufactured by Exxon Chemical, and resin TAFMER®, manufactured by the Corporation Mitsui Petrochemical; and polymers obtained with the catalysts with only center on metal: Nova SURPASS® LLDPE (for example, Surpass® FPS 317-A and Surpass® FPS 117-C) and Sclair VLDPE (for example, Sclair® FP112-A). All these materials generally include copolymers of ethylene with one or more co monomer selected from C4-C10alpha-olefins, such as butene-1 (i.e. 1-butene), hexene-1, octene-1, etc. in which the molecules of the copolymers contain long chains with relatively small number of lateral branches or cross-linked structures. This molecular structure should be contrasted with conventional polyethylene of low or medium density, which are more highly branched than their respective equivalents. Heterogeneous copolymers of ethylene with alpha-olefin, usually known as LLDPE, have a density usually in the range of from about of 0.91 grams per cubic centimeter to about of 0.94 grams per cubic centimeter. Druginvolved ethylene and alpha-olefin, such as homogeneous copolymers of ethylene and alpha-olefin with long-chain branchings, available from the Dow Chemical company, known as AFFINITY resin®, are also included as another type of homogeneous copolymers of ethylene and alpha-olefins suitable in the present invention.

Used here, the expression "C2-3/C3-20the copolymer includes a copolymer of ethylene with C3-C20alpha-olefin and a copolymer of propylene with C4-C20alpha-olefin. Similar expressions shall be construed accordingly.

Used here, the term "polyethylene, very low density" refers to a heterogeneous copolymer of ethylene with alpha-olefin, having a density of 0,915 g/cm3and below, preferably from about 0.88 to to 0,915 g/cm3. Used here, the expression "linear low density polyethylene" refers to and includes both heterogeneous and homogeneous copolymers of ethylene and alpha-olefin, having a density of at least 0,915 g/cm3preferably from 0,916 to 0.94 g/cm3.

Used here, the term "package" includes a package with a seam in the form of the letter L, packets with a side seam, the packets with the wrong stitch and bags. Package with a seam in the form of the letter L has an open top, a bottom seam, one side seam along the edge of the first side and seamless (i.e. folded, securepay) the second edge with the parties. Package with side seam has an open top, seamless bottom edge and along each of the two side edges is welded seam. Although the seams along the side edges and/or bottom edges can be at the very edge (i.e. the seams of the type usually called "welds cut"), preferably the seams are inside (preferably 1/4-1/2 inch, more or less) from the lateral edges of the package, and preferably made with application of the device for heat sealing impulse type, which uses the rod which is quickly heated and then cooled rapidly. Package with reverse seam is a package having an open top, welded seam running parallel to the length of the packet, and the film package is welded or seam joining the ends of the material, or lapped seam, two seamless side edges and the bottom seam along the bottom edge of the package. The bag is made of two films that are welded together along the bottom and along each side edge, resulting in a weld bead with the letter P. Several different types of packages described in the patent US 6790468 (Mize and others), (Mize and others), entitled "Made of lining package and method of manufacturing", the content of which is hereby entered the link. In the patent Mize and other batch part of a package with lining does not include pads. Packing obtained by the use of form-fill-sealing process described in the patent US 4589247, burdensom above.

Shell is also included in the group of packaging of the present invention. Shell include seamless tubular shell having at the ends of the clamps or welded at the ends, and also shell with back seam. Shell with reverse seam include shell with reverse seam overlap (i.e. the reverse of the welded seam between the inner layer and the outer layer of the shell, i.e. the seam between one outer film layer with the other outer film layer of the same film), a shell with back seam joining the edges (i.e. the inside seam between the inner layer of the membrane, welded to itself, resulting in a "rib", protruding from the shell, and the shell from the inside seam, welded butt joint, in which the longitudinal edges of the film sheath adjacent to each other, and the outer layer film shell is welded to the ribbon, forming the inside seam. All these ways of implementation are disclosed in US patent 6764729 B2 (Ramesh and others), entitled "Sheath with back seam and including them Packed product", which is hereby introduced by reference in its entirety.

Examples 1 and 2

The following multi-layered to withstand sterilization in an autoclave films were obtained using the method cast casting film shown in Fig. 1. Polymer granules 10 was filed in zagruzochno the funnel 12 and melted, directed and degirolami in the extruder 14. For convenience in Fig. 1 shows only one funnel and one extruder. However, there was a hopper and an extruder for each of the nine layers of the obtained multilayer film. The molten streams from each extruder 14 was applied in multi-layer slotted cylinder 16, whence it flows out in the form of a multilayer extrudate 18. Multilayer extrudate 18 were cast below the head 16 on the rotating casting drum 20 with a diameter of about 43 inches, which was maintained at 40°F.

Soon after contact with the molding drum 20 extrudate 18 utverjdala and cooled water from the water knife 22, forming a multilayer film 19. Multi-layer film 19 were partially wrapped around a molding drum 20 and then passed partially wrapped around the first cooling roller 24, and then partially wrapped around the second cooling roller 26. Cooling platens 24 and 26 had a diameter of approximately 18 inches and was maintained at room temperature. Then the multilayer film 19 passed over valikamam feeder 28; shows how it is then passed through the camera exposure 30, upon receiving the irradiation dose of the electron beam 40 kGy, which resulted in sterilized stitched multilayer film 32. However, in reality, a multilayer film 19 was first wound, then unwrapped and held through the camera is plucene 30, where she was exposed to an electron beam, receiving a dose of 40 kGy, which resulted in sterilized stitched multilayer film 32.

The composition of layers, order of layers, the function layer and the thickness of each of the 9 layers of the films of examples 1-10 are shown below in tables 1, 2 and 3. In the table below table 3 shows the density, melt index and a General description is given of the chemical composition of various vintage resins indicated in the tables.

Table 1 (Films of examples 1 and 2)
The film of example No.Layer No. 1
(top)
Layer No. 2
(glutinous)
Layer No. 3Layer No. 4
(sustainable. to damage at high temp.)
Layer No. 5
(the oxygen-impermeable)
Layer No. 6
(sustainable. to damage at high temp.)
Layer No. 7
adhesive, irestone
Layer No. 8
(sustainable. damage at low temp.)
Layer No. 9
(welded and the wetted)
1Atofina
EODOI-03
(48%)
ExxonMobil Exact3128 (44%)
SLIP/AB (8%)
Mitsui
Admer
1053A
BASF
Ultramid
C40
(ostoich. to damage at a moderate pace.)
BASF
Ultramid
B40
EMS
Grivory G21
(92%)
BASF B3Q661 (8%)
BASF
Ultramid
B40
Equistar
Plexar
2246 (60%)
Plexar 2200 (40%)
Dow
Elite
5400G
Dow Dowlex
2037
(30%)
Nova FPs 317-A (63%)
SLIP/AB (8%)
Mil1,050,300,400,600,500,600,500,901,40
2Atofina EOD01-03
(48%)
ExxonMobil Exact3128 (44%)
SLIP/AB (8%)
Mitsui Admer
1053A
BASF Ultamid
C40
(ostoich. to damage at a moderate pace.)
BASF Ultamid
B40
EMS
Grivory G21
(70%)
EMS FE5299
(30%)
BASF Ultamid
B40
Equistar Plexar 2246
(60%)
Plexar 2220
(40%)
Dow Elite
5400G
Dow Dowlex 2037 (30%)
Nova FPs 317-A (63%)
SLIP/AB (8%)
Mil1,050,30 0,400,600,500,600,500,901,40
3
(prior art)
Atofina EOD01-03
(48%)
ExxonMobil Exact3128 (44%)
SLIP/AB (8%)
Mitsui Admer
1053A
BASF Ultamid
C40
(ostoich. to damage at a moderate pace.)
BASF Ultamid
B40
EMS Grivory
G21
BASF Ultamid
B40
Equistar Plexar 2246
(60%)
Plexar 2220 (40%)
Dow Elite
5400G
Dow Dowlex 2037 (30%)
Nova FPs 317-A (63%)
SLIP/AB (8%)
Mil1,050,300,400,600,500,600,500,901,40

Table material
MaterialDensityThe melt indexComposition
Dowlex® 20370,935of 2.5 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgThe copolymer of ethylene and octene obtained on the catalyst of the Ziegler-Natta
Slip/AB =uterine mixture of reducing friction + parting agent =Ampacet® 1027290,95of 1.8 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgAdditive against friction and release agent in the medium from the obtained catalyst of Ziegler-Natta linear low density polyethylene
Atofina EOD01-030,90to 8.0 DG/min, measured according to ASTM D1238, @ 230°C and 2.16 kgIsotactic polypropylene obtained by metallocene catalyst
Exxon Exact® 31280,90of 1.0 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgA copolymer of ethylene and butene obtained by metallocene catalyst
Nova FPs 317A0,917to 4.0 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgThe copolymer of ethylene and octane, obtained for the catalyst with only center p is liberizatsii on metal
Dow Elite® 5400G0,917of 1.0 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgA copolymer of ethylene and octane, obtained by metallocene catalyst
Admer ATI053A0,91of 1.0 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgThe adhesive layer of anhydride grafted LLDPE
Equistar Plexar® 22460,951of 0.6 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgThe adhesive layer of anhydride grafted HDPE
Equistar Plexar® 22200,943of 5.5 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgThe adhesive layer of anhydride grafted HDPE
BASF C401,13-PA-6/6,6
BASF B401,14-PA-6
EMS G211,18-Amorphous PA-6I/6T
AEGIS HCA73QP1,13-Semi-crystalline PA-6/6,6
Surlyn®16500,94of 1.5 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgZinc ionomer resin
Surlyn®18570,94to 4.0 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgZinc ionomer resin
EMS FE52991,21-Semi-crystalline PA-MXD,6/MXD,I
BASF B38Q6611,14-PA-6 with nuclei of crystallization
Exxon ECD3640,912of 1.0 DG/min, measured according to ASTM D1238, @ 190°C and 2.16 kgA copolymer of ethylene and hexene obtained by metallocene catalyst

In Fig. 2 shows the test results for fall for sterilized packages made using the films of examples 1, 2 and 3. As can be seen from Fig. 2, the test results for fall for packaging made from film p is Kerov 1 and 2, far exceeded the results of the test in the fall for packaging made with the film of example 3. It should be noted that the main difference between the films of examples 1 and 2 compared with the film of example 3 is that O2-impermeable layer in comparative example 3 was 100% amorphous polyamide, whereas the O2-impermeable layer in example 1 was a mixture of 92% by weight of amorphous polyamide with 8 weight percent semi-crystalline polyamide, and in example 2 was a mixture of 70 weight percent amorphous polyamide with 30 weight percent semi-crystalline polyamide. Barrier properties of the films of examples 1, 2 and 3 after sterilization in the autoclave were approximately equal, i.e. all had a bandwidth of about 15 cm3/m2/day at standard temperature and pressure.

Although the present invention has been described in relation to preferred variants of implementation, it should be understood that there may be modifications and changes of the invention, without departing from the principles and scope of the invention, as should be easily understood by the experts in this field. Thus, such modifications comply with the below claims.

1. The method of obtaining sterilized in the autoclave Packed food product, comprising: (a) placing a product in a packaging article containing multilayer at alvoco film, welded to itself, the multi-layer packaging film contains: (1) cross the first outer layer, which serves as an insulating layer and a layer in contact with the product, and (2) sewn On2-impervious layer comprising a mixture of: (i) from 50 to 95 wt.%, based on the weight of the mixture of amorphous polyamide comprising at least one polyamide selected from the group consisting of PA-6I/6T; PA-MXD, I/6,I; RA-6/6,T; RA-6/6,I; PA-6,6/6,I; PA-6,6/6,T; and (ii) a semicrystalline polyamide comprising at least one polyamide selected from the group consisting of (a) from 5 to 50% by weight of the mixture RA-MXD,6/MXD,I and (b) from 5 to 15%, by weight of the mixture of polyamide with or without nuclei of crystallization, having a given viscosity, measured in accordance with test method ISO 307, 150 ml/g to 245 ml/g; (C) heat-sealable closed product, so the product was surrounded by a multilayer packaging film; (C) heating the packaged product to a temperature of at least 212°F for at least about 0.5 h, where the heat goes in the presence of steam under pressure.

2. The method according to claim 1, where the product contains at least one member selected from the group consisting of chili, rice, beans, olives, beef, pork, fish, poultry, corn grain, eggs, tomatoes and nuts.

3. The method according to claim 1, where the Packed product heat at a temperature at least 20°F, at least about 75 minutes

4. The method according to claim 1, where the packaged product is warm at a temperature of at least 240°F, at least about 90 minutes

5. The method according to claim 1, in which O2-impervious layer has a thickness of from about 7 microns to about 25 microns, and after autoclaving for 90 minutes at 250°F film has a bandwidth O2at 100%relative humidity on both sides of the film from about 5 to about 25 cm3/m2/day.

6. The method according to claim 1, in which the O2-impervious layer has a thickness of from about 7 microns to about 25 microns, and after autoclaving for 90 minutes at 250°F film has a bandwidth Of2at 100%relative humidity on both sides of the film from about 10 to about 20 cm3/m2/day.

7. The method according to claim 1, in which O2-impermeable layer comprises a mixture comprising from 50 to 95 wt.% based on the weight of the mixture of PA-6I/6T and at least one polyamide selected from the group consisting of: (a) from 5 to 50% by weight of a mixture of PA-MXD and (b) from 5 to 15% by weight of a mixture of PA-MXD,6/ MXD,I.

8. The method according to claim 1, wherein the multilayer packaging film further comprises a second outer layer, which is sewn, which serves as an upper layer and thermovalve layer.

9. The method according to claim 8, in which: (A) crosslinked outer layer comprises a mixture of:
(1) at least one to the component selected from the group consisting of: (a) homogeneous copolymer of ethylene and octene density from about 0,905 g/cm3to about 0,93 g/cm3; (b) homogeneous copolymer of ethylene and butene having a density of approximately 0.90 g/cm3to about 0,93 g/cm3; and (C) homogeneous copolymer of ethylene with hexene density of approximately 0.90 g/cm3to about 0,93 g/cm3; and (2) at least one component selected from the group consisting of: (a) a heterogeneous copolymer of ethylene with an alpha olefin density from about 0,92 g/cm3to about 0.95 g/cm3(0,92-0,94 g/cm3); and (b) a copolymer of propylene with ethylene, having a melting point from about 110°to about 150°C, and (B) crosslinked second outer layer comprises a mixture of: (1) isotactic polymer based on propylene;
(2) a homogeneous copolymer of ethylene with C4-8alpha-olefin with a density of from about 0,86 g/cm3to about of 0.91 g/cm3.

10. The method according to claim 1, wherein the multilayer packaging film further comprises a crosslinked water - and oil-resistant layer containing at least one member selected from the group consisting of: (1) crystalline grafted anhydride copolymer With2-3/S6-20alpha-olefins density of from 0.93 g/cm3to 0.97 g/cm3(ii) a crystalline copolymer With2-3/butene density, what about the least 0,92 g/cm3, (iii) ionomer resin and (iv) a copolymer of ethylene with an unsaturated acid.

11. The method according to claim 1, where the film has a total free shrink of at least 10% at 185°F, as measured by ASTM D 2732.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: film is obtained from a polymer composition. The composition contains 90-99.95 wt % transparent thermoplastic - polycarbonate and 0.01-10 wt % transparent polymer particles on an acrylate base with a "core-cladding" structure with average diameter from 1 to 100 mcm. The film contains more than 500 mln-1 transparent polymer particles on the acrylate base with average diameter from 80 to 200 nm.

EFFECT: invention enables to obtain films with high light transmission and light scattering.

5 cl, 4 tbl, 7 ex

FIELD: construction.

SUBSTANCE: sheet includes, in standard version, a permeable fibre-reinforced thermoplastic middle layer, having the first surface and the second surface. The middle layer includes structures with open cells, formed by accidental weaving of multiple reinforcing fibres, having the average length approximately from 5 to 50 mm and attached to each other by thermoplastic resin, having density approximately from 0.1 g/cm3 to 1.8 g/cm3, content of cavities is approximately between 1 and 95%, and approximately 20-80 wt % of fully or mostly noncompacted fibres or particles of thermoplastic materials. The multilayer sheet also includes at least one first reinforcement shell on the first surface of the middle layer, and at least one second reinforcement shell on the second surface of the middle layer. Each first and each second reinforcement shell includes a matrix of reinforcement fibres and thermoplastic resin, where reinforcement fibres of the matrix on the first surface, and reinforcement fibres of the matrix on the second surface are aligned in two directions. The structural component of a vehicle interior includes a seat back of the specified multilayer fibre-reinforced material.

EFFECT: increased operational reliability.

20 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to use of terpolymers of propylene/butylene/ethylene with a nucleating agent to form sterilising films obtained via extrusion blowing. A film is obtained from a polymer composition containing (i) and (ii) 0.001-1.0 wt % of one or more phosphorus-containing and/or polymeric α-nucleating agents. The terpolymer of propylene, ethylene and butylene consists of 86.0-98.0 wt % propylene, 2.0-12.0 wt % butylene and 0.1 to less than 1.0 wt % ethylene. The obtained films have a) turbidity according to ASTM D 1003-92 for a 50 mcm film less than 8% before and after steam sterilisation at 121°C for 30 minutes and b) lustre at 20° according to DIN 67530 for a 50 mcm film of at least 55% before steam sterilisation at 121°C for 30 minutes and at least 60% after steam sterilisation at 121°C for 30 minutes. The films are sterilisable and have excellent optical and mechanical properties.

EFFECT: improved method of obtaining films.

16 cl, 4 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: silicon layer is extruded. The silicon layer can be extruded onto a carrier layer or the silicon layer and the carrier layer are extruded together from an extruder bore.

EFFECT: method enables to obtain thin silicon layers in a single step.

40 cl, 3 dwg, 3 ex

FIELD: process engineering.

SUBSTANCE: inventions relate to production of polyimide film used as heatproof electric insulation or as metalised film substrates for electronic hardware. Proposed device comprises two containers with solutions of polyamine acid with catalysts and dehydrating agent 1, two gear pumps 2, two-slit spinneret 3, drum 4 or endless tape 6, and high-temperature rolls. Primary element of proposed device is said two-slit spinneret with two separate slit heads to feed solutions and constrictors, 5-10 mm-wide and 10-20 mm-long, arranged on faces of each slit on spinneret edges. Said spinneret consists of two cheeks 7, two half-dies 12 and 14, spacer 13, differential screw 11, threaded coupling 10, lock screw 5, assembly screw 15 and four limiters 8. Produced method comprises feeding two solutions of polyamine acid with ring formation catalysts and dehydrating agent on drum or endless tape moulding surface via one spinneret at 0.8-1.0 MPa with solutions dynamic viscosity of 200-500 p, and performing imidine formation at stepped temperature increase from 150°C to 350°C.

EFFECT: high-quality, uniform-thickness polyiminide film.

4 cl, 4 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: composition contains polyethylene and traditional additives, has density of 0.915-0.955 g/cm3, melt index MI from more than 0 to 3.5 g/10 min, flow-rate rating HLMI/MI of 5-50 and polydispersity Mw/Mn of 5-20. Z-average molecular weight Mz of the mouldable composition is less than 1 million g/mol. The mouldable composition is obtained in one reactor in the presence of a mixed catalyst which contains a pre-polymerised chromium compound and metallocene.

EFFECT: films containing disclosed mouldable compositions have very good mechanical properties, high impact resistance and high breaking strength coupled with very good optical properties, the films do not easily stick together and they can be transported in a car without adding lubricants and anti-adhesives or only in their small amount.

9 cl, 3 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: composition contains a mixture of polyamide, where the ratio of terminal amino groups in the terminal carboxyl groups of the polyamide polymer is less than 0.2, polyester which is capable of crystallising and an interfacial tension reducing agent.

EFFECT: composition enables to obtain dispersed particles with average size of less than 200 nm when stretched, good colour composition which will not exhibit high increase in turbidity with increase in the amount of dispersed material, or has acceptable turbidity during production, and has good colour, especially in the absence of cobalt.

7 cl, 3 tbl, 18 ex, 8 dwg

FIELD: chemistry.

SUBSTANCE: invention describes multimodal polyethylene which is suitable for use as a film, as well as a pipe. The polyethylene is characterised by density between 0.940 and 0.965 g/cm3, flow melt index l21 between 4 and 20 dg/min. The polyethylene contains a low-molecular ethylene copolymer, having weight-average molecular weight between 5000 and 50000 amu, characterised by short-chain branching index between 2.5 and 4.5; and high-molecular ethylene copolymer, having weight-average molecular weight between 60000 and 800000 amu, characterised by short-chain branching index between 2 and 2.5. The invention also describes multimodal polyethylene, where the weight ratio of the high-molecular ethylene copolymer in terms of the overall multimodal composition is between 0.3 and 0.7. The ratio of branching indices of the low- and high-molecular ethylene copolymers is between 1.2 and 6.0.

EFFECT: balance of short-chain branches makes multimodal polyethylene suitable for use in making films, pipes, in fields using centrifugal moulding and blow moulding.

23 cl, 5 dwg, 6 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: air-permeable material contains a woven layer on which there is a polymer film layer. The polymer film layer contains a polymer composition and filler, where the air-permeable material was exposed to physical action in order to make the polymer layer mircroporous, so that SPVP of the air-permeable material is greater than 50 g/m2·24 h, and where the air-permeable material has primary dimension on the length and primary dimension on the width before the said physical action and secondary dimension on the length and secondary dimension on the width after the said physical action, where the secondary dimension on the length is not more than 2% greater than the primary dimension on the length and the secondary dimension on the width is not more than 2% greater than the primary dimension on the width. The invention also discloses methods of producing air-permeable material with said properties.

EFFECT: design of air-permeable material with improved properties.

49 cl, 11 dwg, 3 ex

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of modifying a biodegradable polymer or copolymer. Described is a method of modifying a polymer or copolymer, having the structure of one or more repeating units (1), where n is an integer, m is an integer between 0 and 6, and R is selected from hydrogen, substituted or unsubstituted C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 aralkyl and C7-C20 alkaryl, where said groups may include straight or branched alkyl fragments; optionally one or more substitutes are selected from a group comprising hydroxyl groups, alkoxy groups, straight or branched alk(en)yl, aryloxy, halogen, carboxylic acid, ester, carboxy, nitrile and amido, involving bringing the polymer or copolymer into contact with a cyclic organic peroxide under conditions where at least a certain amount of the said peroxide decomposes. The invention also describes a modified polymer or copolymer obtained using said method.

EFFECT: obtaining a (co)polymer characterised by high degree of branching without formation of gel.

7 cl, 4 ex, 8 tbl, 3 dwg

FIELD: transport, package.

SUBSTANCE: invention relates to plastic bad or pack intended for cooking. Container comprises corking appliance. Said corking appliance is made up of two strips, one per every inner lateral side of the container, and has collar and groove that get jointed in press-fitting. Container comprises discharge appliances to allow pressure control therein. A part of one of said strips, distant from access hole, is not secured to plastic material inner side but is secured to container wall closer to access hole than said press-fitted appliance so that to keep unsecured part closer to access hole than said press-fitted appliance. One strip can have flexible extending part with its free end and having collar/rid of corking appliance with flexible extending part running closer to access hole than said collar/rib so that, with pressure inside the container increasing. Is presses together appliances jointed when press-fitted in place.

EFFECT: prevention of uncoupling of press-fitted parts, ruling out release of steam.

12 cl, 7 dwg

FIELD: personal use articles.

SUBSTANCE: application describes method for manufacturing of multi-chamber pack with internal one or several open or closed chambers, suitable for use in microwave oven, as well as multi-chamber pack. Invention provides for the following: multi-chamber pack having inner permeable wall between chambers is made from single sheet of flexible packing film. The first chamber may contain food product, and the second chamber - source of steam.

EFFECT: increased operational reliability.

15 cl, 18 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to polymer packing films, in particular to those films intended for packing foodstuffs to be sterilised together with package. Proposed method comprises filling heat-sealed multiplayer packing film with product, heating packed product to at least 220°C, and holding it at this temperature for at least an hour in the presence of steam at sterilisation pressure. Film comprises first cross-linked layer, outer heat-sealed layer in contact with product, and second cross-linked layer, outer heat-sealed layer. Said first layer in contact with product comprises mix of homogeneous copolymer of ethylene and alpha-olefine and/or copolymer of propylene and ethylene with malting temperature varying from 110°C to 150°C and containing up to 4.9% by weight of monomer ethylene links. Said second, outer, layer comprises mix of isotactic propylene-based polymer and homogeneous copolymer of ethylene and alpha-olefines C4-8 with density varying from 0.86 g/cm3 to 0.91 g/cm3.

EFFECT: film easily sealed lapped, not sticking to walls of autoclave.

21 cl, 1 dwg, 2 tbl, 7 ex

FIELD: food industry.

SUBSTANCE: invention relates to food industry namely to method of warming of packed food product while using warmth produced during exothermal reaction. Flat thermal module is made with a neck. It contains solid reagent and is placed respectively pack with food product with thermal contact of first of two pack walls and first of two heat-transfering walls of flat thermal module provided. Exothermal chemical reaction is instigated in flat thermal module cavity by supply of fluid reagent. Warmed up vapour-gas mixture produced as a result of exothermal reaction and coming through the neck is warming up the second wall of the food product package by bending of previously flattened neck area of flat thermal module around food product package side segment. Flat thermal module which heat-transferring walls are made of sheet, flexible, heat-conducting material and hermetically connected around the opened loop is used. Conjointly connected neck and reagent solid cavity are formed. Neck segment length is at least 1.4 times longer than food product package thickness.

EFFECT: increased temperature distribution regularity is obtained around the warmed up food product with simultaneous reduce of its warming time.

7 dwg

FIELD: transportation, packing and storage.

SUBSTANCE: packing is intended for packing foodstuff for preparation in microwave. Packing has casing with top front main sheet, bottom front sheet and rear sheet, sealed edge-to-edge. Packing has repeatedly closing hole for feeding foodstuff, discharging means, located to close closing hole so that air flow is directed outside the said hole with increased inner air pressure, and direct air aside from an aperture at increase of internal pressure of air, and weakened sealing arranged on a part of aforesaid edge-to-edge sealing. With inner pressure reaching the critical point, weakened sealing is broken off. Aforesaid critical point is reached, when internal pressure exceeds external pressure in a degree, sufficient for breaking weakened seal.

EFFECT: foodstuff packing for microwave.

14 cl, 13 dwg

FIELD: food industry.

SUBSTANCE: food product package comprises lower and upper sections of containers. The lower section consists of at least one pair of communicating main containers with common flat flanging. The upper section consists of at least one first-type container with flat flanging which is made as a unit with the upper wall of the second main container of the lower section. The upper wall of the second main container is deflectable when a user applies external load to its central part which is a concave one. The lower part of the second main container is inclined in the direction to the respective first main container; the maximal height of its side wall does not exceed the height of the side wall of the respective first main container. A closed chamber with liquid reactant is placed in the second main container. The first-type container of the upper section is placed in the cavity of the first main container of the lower section producing a cell between its bottom and the bottom of the first main container of the lower section with a solid reactant being put in the cell.

EFFECT: invention allows for the increase of the performance parametres of the food product package due to ensuring tightness of both the reaction chamber and the lower section containers as well as for the simplification of the package design and method of its production.

19 cl, 22 dwg

FIELD: food products.

SUBSTANCE: food casing based on aliphatic polyamide and/or aliphatic copolyamide is saturated with smoking fluid on the side facing the food product. vapour permeability of such casing (WDD) determined in accordance with DIN 53 122 is at least 30 g/m2·day in case of unidirectional air supply to the casing at 23°C and 85% relative air humidity. Sausages and sausage chains to be smoked and packed in the casing made in accordance with the invention need not to be hanged in the smoking chamber and there is no oil or fat release during maturation stage.

EFFECT: combined advantages of polymer casings; casings are suitable for packing salami, cooked sausages and cooked smoked sausages.

19 cl, 1 tbl, 3 ex

FIELD: technological processes.

SUBSTANCE: invention is related to the field of package materials, namely, to multi-layer polymer films for food products, and may be used in food industry, and also in agriculture and household use. Package is made of multi-layer film material that includes several layers from polymer components and internal layer adjacent to product that contains polyolefine and modifier. At that as modifier of internal layer, synergetic mixture is used that consists of sodium salt of dehydroacetic acid, calcium lactate or citrate and calcium ethylene diamine tetraacetate with the following ratio of components, wt %: synergetic mixture of sodium salt of dehydroacetic acid, calcium lactate or citrate and calcium ethylene diamine tetraacetatet - 0.5-5.0, polyolefine - the rest. As polyolefine polyethylene is used with high or low density, or propylene, or their mixture, or copolymers of ethylene with propylene or with higher olefins, or vinyl acetate or their mixtures and alloys. Such package has higher protective properties, including antioxidant action, is able to more efficiently suppress microorganisms.

EFFECT: production of package with higher protective properties that is able to more efficiently suppress microorganisms.

5 cl, 6 ex

FIELD: technological processes; package.

SUBSTANCE: package consists of external and at least one internal packet from polymer film. Internal packet is a three-seam packet with zip-lock fastener and notching and is intended for packed liquid or semi-liquid food product. Thickness of film is 50-100 mcm. Volume and amount of loaded product are such that place remains for the loading of the main product. External packet is a packet with doy-pack and notching. Thickness of film is 60-120 mcm. Internal packet has larger size compared to the external one. Internal packet is filled with liquid or semi-liquid product, closed and rolled in tube along packet width, placed into external one and tightly sealed. For packet use external package is opened, internal packet is taken out, unrolled and opened. Product to be cooked is placed in the packet - for instance, meat, poultry, fish or vegetables, then closed and mashed with hands. Packet is put in refrigerator for 3-6 hours, then cooked by any method.

EFFECT: considerable comfort for consumer.

4 cl

Valve // 2338676

FIELD: food industry.

SUBSTANCE: on-off valve made so that it can be placed on packing and opened at excessive pressure inside of packing is suggested. A layer of adhesive is formed with an orifice aimed at joining while using with an orifice of packing. An additional elastic layer of adhesive is applied over the first layer. Two layers of adhesive are joined with each other so that when the valve opens it discloses a preliminary formed channel ensuring a pass-through between the layers of adhesive. Adhesive substance of the additional layer is spread over a surface, which forms part of the inner surface of the preliminary formed channel between two layers of adhesive.

EFFECT: valve has a high reliability when it's closed after first heating.

11 cl, 25 dwg

FIELD: process engineering.

SUBSTANCE: multilayer bottle comprises outer and extreme inner layers made from thermoplastic polyether polymer and, at least, one barrier layer arranged between extreme outer and extreme inner layers, and filler material. In compliance with proposed method, filler material is fitted into multilayer bottle with barrier layer that satisfies particular vitrification temperature (50°C<Tg<100°C) and particular water content Wb<1 wt % measured by Carl-Fisher method at 235°C for 30 min. Produced multilayer bottle boasts no lamination between layers at impact or falling effects and may be used for hot filling.

EFFECT: no lamination between layers, nor deformation of barrier layer in hot filling.

16 cl, 5 tbl, 16 ex

Up!