Laminated multilayered welded flat film for manufacture of welded hose-type films and its and their application

FIELD: chemical engineering; production of the laminated multilayered welded flat film used for manufacture of welded hose-type films.

SUBSTANCE: the invention is pertaining to the laminated multilayered welded flat film for manufacture of a welded hose-type films used as a packing and a shell for food stuff. Both surface layers of the multilayered flat film are formed at least of one copolyamide and at least of one amorphous polyamide and-or at least of one homopolyamide and-or at least of a modified polyolefin. The multilayered flat film is manufactured using a method of masking, at least, of two flat films, which in turn are a single layered-or multilayered and not obligatory are biaxially stretched out. The invention allows to increase the strength of the welded seam and to improve impermeability for a water steam and oxygen.

EFFECT: the invention ensures an increased strength of the welded seams of the laminated multilayered welded flat film and its improved impermeability for a water steam and oxygen.

25 cl 5 ex

 

The present invention relates to multi-layer welded flat film of which the known method of welding is made tubular film used as packaging and wrappers for food products, primarily pasty food products, such multi-layer flat film made by laminating at least two flat films, which in turn can be single - or multi-layered biaxially stretched.

Multi-layer welded flat film, which is produced by plants, are well known. Such multilayer flat films by welding is possible by known techniques to produce a tubular film, which can be used as a universal packaging material, which is a flat film is bent in the form of a sleeve or tube and then it is mutually coupled to the opposite edges are connected using imposed on them and passing in the longitudinal direction of the heat-sealing tape. In accordance with another possible technology for the production of blown film, flat film first bend in the form of a sleeve or tube with overlapping overlap the opposite edges at each other and then these overlapping areas of the film are welded together. A third possible manufacturing technology of the bag p is yenok of the flat film is that first flat film bend in half in the form of a sleeve or tube and then its opposite peripheries welded between them along the longitudinal axis with the formation of a longitudinal folds, which are adjacent to each other surfaces are the initially flat film on the same side.

This film along with high impermeability to water vapor and oxygen must also meet the high requirements regarding weldability, primarily on the strength of the weld.

Based on the foregoing, the present invention was used to develop a flat film that would satisfy the above requirements.

This problem is solved according to the invention using a multi-layer, welded flat film, which is manufactured by laminating at least two flat films, which in turn can be single - or multi-layered biaxially stretched, and having both its welded surface layer formed of at least one copolyamid, and at least one amorphous polyamide and/or at least one homopolyamide, and/or at least one modified polyolefin, and between both of these welded surface, layers, optionally with at least one layer.

MC is connected above the surface layers obtained at least one heat sealable copolyamid. These are known as such copolyamids derived from monomers selected from the group comprising caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sabotinova acid, deconditioning acid, dodecadienol acid, terephthalic acid, isophthalic acid, tetramethylaniline, pentamethylenebis, hexamethylenediamine were, octamethylene and xylylenediamine. The thickness of each of the surface layers is from 5 to 16 microns.

With the invention it has been unexpectedly found that the formation of the surface layer from copolyamid with the addition thereto of an amorphous polyamide and/or homopolyamide and/or modified polyolefin can significantly increase the strength of the heat-sealed seam compared to the strength of the heat-sealed seam characteristic of the film, the surface layer which is formed of pure copolyamid, respectively, to achieve a high strength heat-sealed seam is already at a lower temperature of heat sealing. In accordance with this proposed invention the film has significant performance advantages over known films.

As amorphous polyamides for forming the surface layer use the polyamides, the glass transition temperature which is in a dry status and ranges from 50 to 200° With, preferably 90-160°C. Examples of such polyamides are polyamide 6I/6T, polyamide 6-3-T and polyamide 6I.

As homopolyamide for forming the surface layer use polyamides which can be obtained from the same monomers as described above copolyamids. Such homopolyamide can be an aliphatic and partially aromatic compounds.

Modified polyolefins are copolymers of ethylene or propylene and optionally other linear α-olefins containing from 3 to 8 C-atoms, with α,βunsaturated carboxylic acids, preferably acrylic acid, methacrylic acid and/or their salts with metals and/or their alkylamino esters, or the corresponding graft copolymers of these monomers grafted to a polyolefin or a partially saponified copolymers of ethylene with vinyl acetate, which are not necessarily subjected to graft copolymerization with α,β-unsaturated carboxylic acid and characterized by a low degree of saponification, or mixtures thereof. Modified polyolefins can also be a modified Homo - or copolymers of ethylene and/or propylene and optionally other linear α-olefins with 3 to 8 C-atoms, containing grafted on them monomers selected from the group α,βunsaturated dicarboxylic to the slot, preferably maleic acid, fumaric acid, taconova acid or their anhydrides, esters, amides or imides.

The main component of each of the surface layers is a heat sealable copolyamide or a mixture thermovalve of copolyamids, the number of such main component is from 50 to 95 wt.%. Each of the other components, which are amorphous polyamide, homopolyamide and the modified polyolefin can be added to the main component in an amount of from 0 to 30 wt.% in terms of the whole mass of the surface layer.

Between the two surface layers proposed in the invention of flat film is additionally at least one layer. This is located between the two surface layers, the additional layer, respectively, such positioned between the two surface layers additional layers along with weldability attached, respectively, give a flat film and other desirable properties, such as high barrier properties, prevents the penetration of oxygen and water vapor, high tensile piercing or high mechanical properties.

As the materials from which it is possible to form the intermediate layers located between both surface layers, use polyamides, polyolefins, modi is data polyolefins and copolymers of ethylene and vinyl alcohol. Such materials can also be used in mixtures with each other. In addition, if adjacent layers do not have sufficient adhesion to each other, between them you can include additional layers, obtained from the amplifiers (promoters) of adhesion.

The polyamides used for forming the intermediate layer may be a Homo - and/or copolyamids derived from monomers selected from the group comprising caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sabotinova acid, deconditioning acid, dodecadienol acid, terephthalic acid, isophthalic acid, tetramethylaniline, pentamethylenebis, hexamethylenediamine were, octamethylene and xylylene diamine. Preferred Homo - and copolyamids are polyamide 6, polyamide 12, polyamide 66, polyamide 610, polyamide 612, polyamide MXD6, polyamide 6/66, and polyamide 6/12, and nylon 6I/6T. The thickness of the polyamide intermediate layer is 5 to 30 μm.

The polyolefins used for forming the intermediate layer, are homopolymers of ethylene or of propylene and/or copolymers, linear α-olefins with 2 to 8 C-atoms. For formation of this layer, it is preferable to use a linear low density polyethylene, high density polyethylene, a homopolymer of polypro Elena, the block copolymer of polypropylene and a statistical copolymer of polypropylene. The thickness of the polyolefin of the intermediate layer is 5 to 30 μm.

Modified polyolefins used for forming the intermediate layer include copolymers of ethylene or propylene and optionally other linear α-olefins containing from 3 to 8 C-atoms, with α,βunsaturated carboxylic acids, preferably acrylic acid, methacrylic acid and/or their salts with metals and/or their alkylamino esters, or the corresponding graft copolymers of these monomers grafted to a polyolefin or a partially saponified copolymers of ethylene and vinyl acetate, which are not necessarily subjected to graft copolymerization with α,βunsaturated carboxylic acid and characterized by a low degree of saponification, or mixtures thereof. Modified polyolefins can also be a modified Homo - or copolymers of ethylene and/or propylene and optionally other linear α-olefins with 3 to 8 C-atoms, containing grafted on them monomers selected from the group α,βunsaturated dicarboxylic acids, preferably maleic acid, fumaric acid, taconova acid or their anhydrides, esters, amides or imides. The thickness of the intermediate layer formed of a modified floor is the olefin, is from 5 to 30 microns.

Copolymers of ethylene and vinyl alcohol, which is used for forming the intermediate layer, obtained by the complete saponification of copolymers of ethylene with vinyl acetate. In General, the proportion of ethylene in the copolymers with vinyl alcohol varies from 27 to 48 mol.%. The intermediate layer is preferably formed from a copolymer of ethylene and vinyl alcohol, in which the proportion of ethylene varies from 34 to 48 mol.%. The thickness of the intermediate layer formed of a copolymer of ethylene and vinyl alcohol is from 3 to 20 microns.

Amplifiers adhesion, if they are used in the intermediate layer can serve as a modified Homo - or copolymers of ethylene and/or propylene and optionally other linear α-olefins with 3 to 8 C-atoms, containing grafted on them monomers selected from the group α,βunsaturated dicarboxylic acids, preferably maleic acid, fumaric acid, taconova acid or their anhydrides, esters, amides or imides. The thickness of the layer with the adhesion promoter is from 3 to 20 microns.

Between the two surface layers proposed in the invention of flat film can optionally include one or more layers of glue for laminating providing bonding between the individual films, of which plants are made offered from the reteni multilayer flat film.

Below are the preferred sequencing of the individual layers in the proposed invention the multilayer flat films, used to symbolize such layers letters and numbers have the following meanings:

And: welded surface layer,

B: polyamide intermediate layer,

In: polyolefin intermediate layer,

G: intermediate layer of a modified polyolefin,

D: the intermediate layer of a copolymer of ethylene and vinyl alcohol,

E: intermediate layer of adhesion promoter,

//: the plane of the backing.

Numeric indices 1, 2, etc. indicate the presence in the film of an appropriate number of layers, formed from the original materials of the same class.

The three-layer structure:

And1//BA2, A1//B//A2And1//YES2

Four-layer structure:

And1B//GA2And1B//DA2And1G//YES2, A1B//B//A2

Five-layer structure:

A1E1B//GA2And1E1B//DA2And1G//BDA2And1//B1DB2//A2And1B////YES2, A1B1//B//B2A2And1//B1B2B3//A2

Six-plane structure:

And1DB//WEAH2And1E1D//BE2And2And 1G1E//BH2And2, A1E1B//DE2A2, A1E1B//BEA2, A1E1B1//B2E2A2And1G//B1B2B3//A2And1EB1//B2YES2And1G//B1DB2//A2

Layered structure:

And1G1//B1DB2//G2And2And1E1//BDE2And2And1G1//B1B2B3//G2And2, A1E1B1//B//B2E2A2, A1E1B1//B//B2E2A2

In addition to the above materials in the composition of the flat film may also contain conventional excipients, such as protecting the film from sticking together, stabilizers, antistatic agents or softeners. Such excipients are usually added in amounts of from 0.1 to 5 wt.%. In addition, the film can also be painted in a specific color by adding pigments or mixtures thereof.

On the original film for laminating can be applied printed. If such printed printed on the other side of the original film, which while backing overlaps another film, the finished laminated wrapped this film printed is between two separate layers and thereby protected from possible p is uridine during subsequent processing of the film.

Proposed in the invention of flat film made by laminating at least two flat films, which in turn can be single - or multi-layered biaxially stretched. The setting for laminating a separate film by stamping and, if necessary, application of the adhesive for laminating interconnected in such a way that the layers of which the main component is a heat sealable copolyamide form both the surface layer laminated wrapped flat film. This method can produce a wide flat film, the width of which exceeds that required for their use as packaging and wrappers for food products. In this case, a wide flat film can be cut in the longitudinal direction on the narrower the same type of tape, which then can be welded with getting blown film required dimensions.

The total thickness of the proposed invention blown film is from 30 to 100 μm, preferably from 40 to 80 microns.

Parameters weldability proposed in the invention blown film was determined by the strength of their heat-sealed seams in comparison with the strength of the heat-sealed seams comparative films.

To determine the strength of heat-sealed seams from each of the tested flat film perpendicular to the direction of formation of the deposits cut samples in the form of strips with a width of 50 mm Two cut off from one of the film strips were welded between them, while in the first case, the surface layer 1 of one of the strips were welded with its overlying lapped surface layer 2 of the other strips (1st welding method), and in the second case, the surface layer 1 of one of the strips were welded with overlaid surface layer 1 of the other strips (2nd welding method). As the welding machine used laboratory welding apparatus of the type SGPE 20 firms W. Verpackungsmaschinen. After welding, the samples from cut strips of a width of 25 mm so that the welded seam is perpendicular to the longitudinal length of the strips. Then these strips were subjected to tensile strength in a tensile testing machine company Instron with exhaust velocity of 500 mm/min until rupture of the weld. The maximum force at which the test film was torn weld seam, indicated below as the strength of the weld.

The strength of the weld at the proposed invention is a flat films obtained by sealing the 1st method at a temperature of 120°C, significantly higher than the strength obtained in the same conditions weld the comparative films. The samples produced by sealing in the 2nd method, the strength of their weld obtained at a temperature of 180°and at a temperature of 200°C, significantly higher than the strength obtained is ri the same temperature of the weld comparative films.

Below the invention is described in more detail in the examples.

Example 1

The setting for laminating of two three-layer, biaxially stretched, coextruding flat film using the adhesive for laminating the lamination produced six-plane is a flat film, with heat sealable layers (1 layer each three-layer film) is ready flat film was placed with its outer sides.

In the original three-layer film layers were arranged in the following order:

Film 1:

1st layer: a mixture of 90% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, and 10% ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 10 ám.

2nd layer: an adhesion promoter, which used a modified polyethylene, which is a product Bynel 4140 company Du Pont de Nemours GmbH, 7 microns.

3rd layer: polyethylene (LLDPE), which is a product

Dowlex 2049 E DOW Chemical Company, 13 mm

Film 2:

1st layer: a mixture of 90% polyamide 6/12, representing a product Grilon CP6S company EMS-Chemie, and 10% ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 10 ám.

2nd layer: an adhesion promoter, which used a modified polyethylene, which is a product Bynel 4140 company Du Pont de Nemours GmbH, 7 microns.

3rd layer: polyami is 6, representing a product Durethan 40 F Bayer AG, 13 microns.

When determining the strength of welded joints were obtained the following results:

Welding 1-m method:

welding temperature 120°:183 N/25 mm
welding temperature 200°:116 N/25 mm

Welding 2-m method:

welding temperature 180°:94 N/25 mm
welding temperature 200°:95 N/25 mm

Example 2

The setting for laminating of two three-layer, biaxially stretched, coextruding flat film using the adhesive for laminating the lamination produced six-plane is a flat film, with heat sealable layers (1 layer each three-layer film) is ready flat film was placed with its outer sides.

In the original three-layer film layers were arranged in the following order:

Film 1:

1st layer: a mixture of 85% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, 5% polyamide 6I/6T, which is a product Grivory G21 company EMS-Chemie, and 10% ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 10 ám.

2nd layer: an adhesion promoter, which COI is litovali modified polyethylene, representing a product Bynel 4140 company Du Pont de Nemours GmbH, 7 microns.

3rd layer: polyethylene (LLDPE), which is a product Dowlex 2049 E DOW Chemical Company, 13 microns.

Film 2:

1st layer: a mixture of 85% polyamide 6/12, representing a product Grilon CP6S company EMS-Chemie, 5% polyamide 6I/6T, which is a product Grivory G21 company EMS-Chemie, and 10% ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 10 ám.

2nd layer: a copolymer of ethylene and vinyl alcohol, which is a product Soarnol AT4406 company Nippon Gohsei, 6 ám.

3rd layer: polyamide 6, which is a product Durethan 40 F Bayer AG, 13 microns.

When determining the strength of welded joints were obtained the following results:

Welding 1-m method:

welding temperature 120°:192 N/25 mm
welding temperature 200°:116 N/25 mm

Welding 2-m method:

welding temperature 180°:88 N/25 mm
welding temperature 200°:97 N/25 mm

Comparative example

Analogously to example 1 of the two-layer film plants produced six-plane is a flat film, with the only difference that for the formation of each of the first layers obey the three-layer films used pure polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie.

When determining the strength of welds such comparative films were obtained the following results:

Welding 1-m method:

welding temperature 120°:167 N/25 mm
welding temperature 200°:113 N/25 mm

Welding 2-m method:

welding temperature 180°:77 N/25 mm
welding temperature 200°:79 N/25 mm

Example 3

The setting for laminating of the monolayer, biaxially stretched flat film and a two-layer, biaxially stretched coextruding flat film using the adhesive for laminating the lamination produced three-layer flat film, with heat sealable layer (1st layer) double layer flat film was disposed on both outer sides of the obtained flat film.

In the original film layers were arranged in the following order:

Film 1:

1st layer:

a mixture of 85% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, and 15% of the ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 15 ám.

Film 2:

1st layer:

a mixture of 85% polyamide 6/12, to depict allaudio a product Grilon CF6S company EMS-Chemie, and 15% of the ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 10 ám.

2nd layer:

polyamide 6, which is a product Durethan In 40F Bayer AG, 15 ám.

When determining the strength of welded joints were obtained

the following results:

Welding the first method:

Welding temperature 120°:194 N/25 mm
Welding temperature 200°:110 N/25 mm

Welding the second method:

Welding temperature 180°:91 N/25 mm
Welding temperature 200°:95 N/25 mm

When determining the permeability to water vapor and oxygen obtained the following results:

The water vapor permeability: 14 g/m2day

The oxygen permeability: 26 cm3/m2day bar

Example 4

The setting for laminating of three-layer, biaxially stretched flat film and a four-layer, biaxially stretched coextruding flat film using the adhesive for laminating the lamination produced seven-layer flat film, with heat sealable layers (in each case, the 1st layer) were placed on both outer sides of the obtained flat film.

In source the x films layers were arranged in the following order:

Film 1:

1st layer:

a mixture of 85% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, and 15% of the ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 12 microns.

2nd layer: an adhesion promoter, which was used polyethylene, which is a product Bynel 4140 company Du Pont de Nemours GmbH, 6 ám.

3rd layer:

polyethylene (LLDPE), which is a product Dowlex 2049 E DOW Chemical Company, 12 microns.

Film 2

1st layer:

a mixture of 85% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, and 15% of the ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 10 ám.

2nd layer:

an adhesion promoter, which used a modified polyethylene, which is a product Bynel 4140 company Du Pont de Nemours GmbH, 7 microns.

3rd layer:

a copolymer of ethylene and vinyl alcohol, which is a product Soamol AT4406 company Nippon Gohsei, 7 microns.

4th layer:

polyamide 6, which is a product Durethan In 40F company Voeg AG, 11 mm.

When determining the strength of welded joints were obtained the following results:

Welding the first method:

Welding temperature 120°:192 N/25 mm
Welding temperature 200°:114 N/25 mm

Welding the second method:

Welding temperature 180°:89 N/25 mmWelding temperature 200°:93 N/25 mm

When determining the permeability to water vapor and oxygen obtained the following results:

The water vapor permeability: 2 g/m2day

The oxygen permeability: 4 cm3/m2day bar

Example 5

The setting for laminating of two single-layer, biaxially stretched flat film using the adhesive for laminating the lamination produced two-layer flat film.

In the original film layers were arranged in the following order:

Film 1:

1st layer:

a mixture of 90% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, and 10% ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 20 ám.

Film 2:

1st layer:

a mixture of 85% polyamide 6/12, representing a product Grilon CF6S company EMS-Chemie, 5% polyamide 6I/6T company EMS-Chemie and 10% ionomer resin, which is a product Surlyn 1652 company Du Pont de Nemours GmbH, 25 ám.

When determining the strength of welded joints were obtained the following results:

Welding the first method:

Welding temperature 120°:190 N/25 mm
Welding temperature 200°: 111 H/25 mm

Welding the second method:

Welding temperature 180°:89 H/25 mm
Welding temperature 200°:91 H/25 mm

When determining the permeability to water vapor and oxygen obtained the following results:

The water vapor permeability: 13 g/m2day

The oxygen permeability: 93 cm3/m2day bar

Indicators of permeability to water vapor and oxygen in the films obtained in the examples given in the description.

Example 1

When determining the permeability to water vapor and oxygen obtained the following results:

The water vapor permeability: 3 g/m2day

The oxygen permeability: 30 cm3/m2day bar

Example 2

When determining the permeability to water vapor and oxygen obtained the following results:

The water vapor permeability: 2 g/m2day

The oxygen permeability: 4 cm3/m2day bar

Comparative example

When determining the permeability to water vapor and oxygen obtained the following results:

The water vapor permeability: 3 g/m2day

The oxygen permeability: 29 cm3/m2day bar

1. Laminated weldable p is Oska film to obtain a welded tubular film, characterized in that both the surface layer are welded and formed of at least one copolyamid and at least one amorphous polyamide and/or at least one homopolyamide, and/or at least one modified polyolefin, and the flat film made by laminating at least two flat films, which in turn are single or multi - layer and optional biaxially stretched.

2. The flat film according to claim 1, characterized in that the copolyamids included in the composition of the surface layers derived from monomers selected from the group comprising caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sabotinova acid, deconditioning acid, dodecadienol acid, terephthalic acid, isophthalic acid, tetramethylaniline, pentamethylenebis, hexamethylenediamine were, octamethylene and xylylenediamine.

3. The flat film according to claim 2, characterized in that the content of copolyamids in each of the surface layers is 50 to 95 wt.%.

4. The flat film according to any one of claims 1 to 3, characterized in that the surface layers contain amorphous polyamides, glass transition temperature which is in a dry condition ranges from 50 to 200°C.

5. The flat film according to claim 4, characterized in that the glass transition temperature of the amorphous polyamide is preferably from 90 to 160° C.

6. The flat film according to any one of claims 1 to 5, characterized in that the surface layers contain homopolyamide derived from monomers selected from the group comprising caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sabotinova acid, deconditioning acid, dodecadienol acid, terephthalic acid, isophthalic acid, tetramethylaniline, pentamethylenebis, hexamethylenediamine were, octamethylene and xylylenediamine.

7. The flat film according to any one of claims 1 to 6, characterized in that the surface layers contain modified polyolefins, which are copolymers of ethylene or propylene and optionally other linear α-olefins containing from 3 to 8 C-atoms, with α,βunsaturated carboxylic acids, preferably acrylic acid, methacrylic acid, and/or their salts with metals and/or their alkylamino esters, or the corresponding graft copolymers of these monomers grafted to a polyolefin or a partially saponified copolymers ethylene and vinyl acetate, which are not necessarily subjected to graft copolymerization with α,βunsaturated carboxylic acid and characterized by a low degree of saponification, or mixtures thereof.

8. The flat film according to any one of claims 1 to 7, characterized in that the quantity of each is C included in the composition of surface layers of other components, which are amorphous polyamide, homopolyamide and the modified polyolefin is from 0 to 30 wt.% in terms of the whole mass of the respective surface layer.

9. The flat film according to any one of claims 1 to 8, characterized in that the thickness of each of the surface layers is from 5 to 16 microns.

10. The flat film according to claim 1, characterized in that between the surface layer additionally has at least one intermediate layer.

11. The flat film according to any one of claims 1 to 10, characterized in that located between the surface layers of the intermediate layer, respectively located between the surface layers, intermediate layers, respectively, obtained from materials or their mixtures selected from the group comprising polyamides, polyolefins, modified polyolefins and copolymers of ethylene and vinyl alcohol.

12. The flat film according to any one of claims 1 to 11, characterized in that the polyamide forming part located between the surface layer of the intermediate layer is at least one homopolyamide and/or at least one copolyamide derived from monomers selected from the group comprising caprolactam, laurinlactam, ω-aminoundecanoic acid, adipic acid, azelaic acid, sabotinova acid, deconditioning acid, dodecadienol acid, t is metalevel acid, isophthalic acid, tetramethylaniline, pentamethylenebis, hexamethylenediamine were, octamethylene and xylylenediamine.

13. The flat film according to item 12, characterized in that the thickness of the intermediate polyamide layer is from 5 to 30 microns.

14. The flat film according to any one of claims 1 to 13, characterized in that the polyolefin member is located between the surface layer of the intermediate layer include homopolymers of ethylene or of propylene and/or copolymers, linear α-olefins containing from 2 to 8 C-atoms.

15. Flat film 14, characterized in that the thickness of the intermediate polyolefin layer is from 5 to 30 microns.

16. The flat film according to any one of claims 1 to 15, characterized in that the modified polyolefin member is located between the surface layers, the additional layer are copolymers of ethylene or propylene and optionally other linear α-olefins containing from 3 to 8 C-atoms, with α,βunsaturated carboxylic acids such as acrylic acid, methacrylic acid, and/or their salts with metals and/or their alkylamino esters, or the corresponding graft copolymers of these monomers grafted on the polyolefin or a partially saponified copolymers of ethylene and vinyl acetate, which are not necessarily subjected to graft copolymerization with α thatβunsaturated carboxylic acid and characterized by a low degree of saponification, or mixtures thereof.

17. The flat film according to item 16, characterized in that the thickness of the modified polyolefin is from 5 to 30 microns.

18. The flat film according to any one of claims 1 to 14, characterized in that the proportion of ethylene in the copolymer of vinyl alcohol, part of which is located between the surface layer additional layer varies from 27 to 48 mol.%, preferably from 34 to 48 mol.%.

19. Flat film on p, characterized in that the thickness of a layer of a copolymer of ethylene and vinyl alcohol is from 3 to 20 microns.

20. The flat film according to any one of claims 1 to 19, characterized in that it is in the intermediate layer contains an adhesion promoter, which are modified Homo - or copolymers of ethylene and/or propylene and optionally other linear α-olefins with 3 to 8 C-atoms, containing grafted on them monomers selected from the group α,βunsaturated dicarboxylic acids such as maleic acid, fumaric acid, taconova acid, or their anhydrides, esters, amides or imides.

21. The flat film according to claim 20, characterized in that the thickness of the layer of adhesion promoter is from 3 to 20 microns.

22. The flat film according to any one of claims 1 to 21, characterized in that its total thickness is from 30 to 100 μm, predpochtitelno 40 to 80 microns.

23. Laminated weldable flat film according to any one of claims 1-22, manufactured by laminating at least two flat films.

24. The use of flat film according to any one of claims 1 to 23 for the manufacture of tubular film.

25. The use of tubular film at a point 24 as packaging and wrappers for food products.



 

Same patents:

FIELD: polymers.

SUBSTANCE: invention relates to thermoplastic polymer comprising block of thermoplastic polymer and at least one block of polyalkylene oxide. Block of thermoplastic polymer comprises: macromolecular chain of stellate or H-like form comprising at least one polyfunctional core and at least one by-side chain or one segment of thermoplastic polymer bound with a core. Core comprises at least three similar functional reaction groups or linear macromolecular chain comprising one bifunctional core and at least one segment of thermoplastic polymer bound with the core. Block or blocks of polyalkylene oxide are bound at least with one part of free terminal groups of thermoplastic polymer block by the following manner: at least one free terminal group of macromolecular chain of stellate or H-like form taken among terminal groups of by-side chain or segment of thermoplastic polymer and terminal groups of polyfunctional core is bound with polyalkylene oxide block and/or at least one free terminal group of linear macromolecular chain taken among terminal groups of segment of thermoplastic polymer and terminal groups of bifunctional core is bound with polyalkylene oxide block. Two free terminal groups of linear macromolecular chain are bound with polyalkylene oxide blocks if block of thermoplastic polymer comprises macromolecular chains of linear type only. Also, invention relates to a method for preparing thermoplastic polymer, using thermoplastic polymer, polymeric thermoplastic composition, threads, fibers and filaments, textile article and article. Invention provides preparing thermoplastic polymer possessing the stable hydrophilic properties and retaining mechanical properties.

EFFECT: valuable properties of polymer.

29 cl, 6 tbl, 23 ex

FIELD: polymer materials.

SUBSTANCE: invention relates to a method for preparing composition for flexible tubes designed transportation of crude oil or gas when developing offshore oil and gas deposits, in particular to tube containing polyamide-based layer. Composition contains 70-96% at least one polyamide, 4-10% plasticizer, 0-25% elastomer, and stabilizers - the rest. Polyamide is selected from group including: PA 11; PA 12; aliphatic polyamides obtained by condensation of aliphatic diamine containing 6-12 carbon atoms with dibasic aliphatic acid containing 9-12 carbon atoms; and copolyamides 11/12 containing either above 90% units 11 or above 90% units 12. Elastomer utilized is nitrile-butadiene rubber or hydrogenated analogue thereof. Total amount of plasticizer and elastomer ranges from 4 to 30%.

EFFECT: increased resistance of composition to ageing.

9 cl, 4 tbl, 4 ex

Fuse // 2265629

FIELD: protective devices.

SUBSTANCE: fuse comprises housing and two leads projecting out of the housing. The housing has fuse members interconnected between the two leads. The housing of the fuse is made of a polyamide composition that comprises, in mass%, 5-95 of polyamide copolymer and 5-95 of polyamide homo-polymer.

EFFECT: enhanced reliability.

5 cl, 2 dwg, 5 tbl, 45 ex

FIELD: composite materials.

SUBSTANCE: invention relates to a method for preparing compositional tribotechnical material that could be used in mechanical engineering for manufacturing tribotechnical articles and coatings for friction units of various-functional destination machines and mechanisms. Material contains 0.01-5.9% ultrafine modifier, 0.1-1.0 functional additive, and, as the rest, polyamide 6/polyamide 11 mixture. Ultrafine modifier utilized are fine particles of naturally occurring silicate-containing minerals with particle size not larger than 100 nm.

EFFECT: improved adhesive, physico-mechanical and tribotechnical characteristics.

2 cl, 2 tbl

FIELD: synthetic fiber production.

SUBSTANCE: preparation of composition, which can be used for molding-mediated manufacture of synthetic threads, fibers, and filaments and therefore manufacture of woven, knitted, nonwoven, or napped colored ware, is characterized by that 0.01-0.04% of phosphorus-containing stabilizing additive, 0.10-0.30% of sterically hindered phenol antioxidant, and 0.15-0.5% of light stabilizer are introduced into polymerization medium before or during polymerization, said phosphorus-containing stabilizing additive being selected from phosphorous and hypophosphorous acids and said hindered phenol containing at least one sterically hindered amino group.

EFFECT: increased light stability of polyamide ware and avoided significant foaming during polymerization process.

15 cl, 1 tbl, 3 ex

The invention relates to self-lubricating anti-friction composition, which is used for the manufacture of bearings and bearings operated without lubrication or limitation

The invention relates to polymer compositions for anti-friction material, which is used as antifriction details of friction in automotive, instrument, electric industry, agregatostroyeniya and other industries

The invention relates to a colored molding composite materials on the basis of the filled aliphatic polyamides, which are used for different components in mechanical engineering

The invention relates to the development of a thermoplastic composition based on a mixture of polyethylene terephthalate (PET) and its waste is recycled by molding by injection molding, extrusion, etc

The invention relates to hyperbranched copolyamide, to a method for producing hyperbranched copolyamid, which can be used as a viscosity modifier molten thermoplastic polymer compositions, as well as a modifier of thermomechanical properties of polymer materials and as an additive to the thermoplastic matrix to form filaments, fibers

FIELD: packaging materials.

SUBSTANCE: sleeve-like shell is composed of inner layer A, central layer E and outer layer G. Inner layer A tightly fits the contents and mainly consists of aliphatic polyamide or copolyamide and/or polyamide or copolyamide including aromatic links. Central layer E is mainly formed of aliphatic polyamide or copolyamide and/or polyamide or copolyamide including aromatic links. Outer layer G is also formed of aliphatic polyamide or copolyamide and/or polyamide or copolyamide including aromatic links. Located between inner layer A and central layer E is polyolefin intermediate layer C preventing water vapors from penetrating through the layer. Connected with layer A is adhesive layer B. Layer E is coated with adhesive layer D. Oxygen-barrier intermediate layer F is located between outer layer G and central layer E.

EFFECT: increased impenetrability for water vapor and oxygen, increased shelf life of products packed in above shell.

11 cl, 2 tbl, 8 ex

FIELD: film for food packing.

SUBSTANCE: claimed tubular film contains at least three polyamide layers, wherein each layer consists mixture of (mass parts) polyamide 6 70-77; polycaprolactam-hexamethylenediamine-adipic acid copolymer 5-11; amorphous resin 20-25; aromatic polyamide containing hexamethylene diamine and terephthalic acid units in molecule 3-8; and mixture of acid modified copolymers 0.3-5.

EFFECT: film of improved barrier properties, moldability, abrasive and oil resistance.

3 cl

The invention relates to the production of multi-layer materials and can be applied in the construction field at facing of walls, finish floor coverings, insulation, roll roofing materials
The invention relates to a polymer composition for the extrusion of water-insoluble food packaging film, capable of transmitting water vapor and smoke matter smoke

The invention relates to a multilayer thermoformed film to protect the substrate and to the resulting products

The invention relates to at least four, rocafuerte, biaxially elongated casing for food products with an external layer consisting essentially of a mixture, respectively, at least one aliphatic and partially aromatic (co)polyamide and, possibly, pigments, and the inner layer consisting essentially of aliphatic (co)polyamide
The invention relates to biaxially-oriented thermally stabilized bag films on the basis of polyamides, in particular sausage, sosisochnykh or Satelitni shells, and can be used in the manufacture of food products, formed from a paste-like or viscous-flow state and subjected to heat treatment, for which a significant indicator of quality is the possibility of long-term storage in the shell sausage products without compromising consumer properties

The invention relates to a packaging film having sufficiently high permeability with respect to smoke substances smoke and/or water vapor and can efficiently carry out the curing and/or drying Packed in it products

The invention relates to the field of processing technology of polymers, and more particularly to methods of producing a multilayer polymeric nonwoven materials in the form of paintings of unlimited length

FIELD: food processing industry, in particular production of edible collagen membrane for sealing of foodstuffs such as ham, etc.

SUBSTANCE: according to invention fresh porcine skins are rapidly frozen. Then before further treatment thereof skins are defrosted and defatted by using enzymes. Further skins are sequentially treated by fast alkaline hydrolysis, acid hydrolysis and ground to produce gel-like liquid mass. In last step gel-like mass is extruded, plated and dried to produce target membrane.

EFFECT: collagen sealing membrane with excellent protective characteristics against food oxidation and dehydration.

22 cl, 1 dwg, 2 ex

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