Method of fabricating resilient packing laminate

FIELD: process engineering.

SUBSTANCE: invention relates to food packing materials, particularly, to production of packing flexible laminate. At least, one plastic film and, at least, other plastic film, metal foil or paper are coated with adhesive to make laminate layers and bonded together to make said laminate. Then, laminate is continuously irradiated at the line with microwave radiation station for hardening the adhesive.

EFFECT: faster hardening.

9 cl, 2 dwg

 

The present invention relates to a method of manufacturing a flexible laminate (laminated sheet material for packaging, in which at least one plastic film and at least another plastic film, metal foil or paper as the layers of the laminate are connected to each other by means of a polyurethane adhesive, and then the laminate is affected by energy source for curing the adhesive.

In the manufacture of flexible laminates for packaging consisting of a plastic film, aluminum foil or paper as the layers of the laminate, is used, mainly, two-component polyurethane adhesives for joining the individual layers of the laminate. After laminating these adhesives must be able to withstand more than 10 days on parts of the curing at high temperature 45-50°C to achieve complete curing of the adhesive. Similar conditions apply, in particular, for packaging materials that must withstand the processes thermocycler, for example, in an autoclave. Phase curing leads to polymerization of the adhesive by cross-linkage isocyanate and an alcohol component groups of the adhesive. In addition, flow in all chemical reactions leading to the formation of relationships with layers of laminate.

A long period of curing affects the delivery time, and needed the e-capacity storage. In addition, the traditional method of curing requires a high expenditure of energy to maintain the desired temperature. Solution fast curing will significantly reduce the period of time from lamination to shipment of the laminate. System with a combined carrying out lamination and curing will also allow you to avoid the need in the plot/shop-cured with the use of high temperature, which adds to the advantage of lowering power consumption.

Known curing adhesives with a combined carrying out the lamination process with the use of technology on the basis of the electron beam. However, the technology of electron beam curing requires adhesives, which does not come in contact with food products.

The aim of the present invention is to provide a method by which you can reduce the time required for curing of the adhesive in packaging laminates, in comparison with the curing time of the adhesive in the traditional production of the laminate while maintaining established polyurethane adhesives. Furthermore, the method should provide a continuous production of laminates.

This goal is achieved through the present invention, which offers the curing of the adhesive by irradiation of the laminate microwave.

The energy required is for curing the layer of adhesive, and the optimal frequency of microwaves for irradiation laminates depend on the thickness of the laminates and the speed of the tape during continuous lamination process. These parameters can easily be determined by simple experiments.

In addition, the laminate can be heated.

A system of curing accelerating curing, which requires no special adhesive, but applies adhesives based on polyurethane, currently used on the market for packaging food products.

The most effective source of microwave energy completes the polymerization, i.e. the curing of the adhesive, in a much shorter time in comparison with standard heat energy currently used and provide a plot of curing by heating to 45-50°C.

A significant advantage of the present invention a method based on the application of microwave energy for curing adhesives provides a significant reduction in the curing time of adhesives based on polyurethane, used mainly in areas that require high quality laminates, for example where used autoclaves, regardless of the production technology of the source material or cost.

Microwave heating for curing, proposed by the present invention, in particular suitable d is I continuous production of laminates, at which layers of the laminate is continuously coated with adhesive and connect with the formation of the laminate. Then, the laminate is irradiated on the line with the source of energy for curing the adhesive. The irradiation process is preferably applied to the canvas in the process of continuous rental (winder roll or the roll of the layers of the laminate.

The layers of the laminate preferably includes a plastic film of polyester, polyamide, polyvinyl chloride, polypropylene or polyethylene, aluminum foil or paper.

Preferably the adhesive is a two component polyurethane adhesive, consisting of isocyanates, forming a cross connection, and high molecular weight alcohols.

Two-component polyurethane adhesives are formed during chemical reactions between the isocyanate and alcohol components. Chemical reactions begin during phase laminating and completed during the curing phase. Chemical reactions include the reaction of condensation of the Oh-group with NCO-groups of the two components of the adhesive and the reaction with the plastic, metal and paper substrates to ensure the bond strength required within the layers of the laminate. Since both components of a two-component polyurethane adhesive, i.e. the NCO and Oh groups of the two components, is capable of absorbing microwave energy, a chemical reaction begins immediately, N. greva entire laminate rapid kinetic energy without dissipation of energy.

The applied microwave energy preferably is a non-ionizing microwave radiation with a frequency from 300 MHz to 300 GHz, corresponding to a wavelength of 1 m to 1 mm, preferably radiation with a frequency 245 GHz corresponding to a wavelength 12,24 cm, or radiation with a frequency of 915 MHz, corresponding to the wavelength 32,7 see

The preferred field of application of the laminated packaging material, obtained using the proposed in the invention method, is the packaging of food and pharmaceutical products.

The preferred laminated packaging material for packaging of food and pharmaceutical products differs by two or more layers, preferably:

PET film (PET - polyethylene terephthalate)/adhesive/aluminum foil/adhesive/PP (PP - polypropylene), or

PET film/adhesive/ASO (ASO - oriented polyamide film)/PP, or

OPA film/adhesive/aluminum foil/adhesive/PVC (PVC-PVC).

The above laminated packaging material suitable for carrying out the heat treatment under the conditions of the autoclave. Thus, the laminated packaging material recognize suitable for packaging products under conditions of pasteurization or sterilization (autoclave).

Other advantages, features and details of the proposed invention is a revelation what s in the following description of preferred embodiments of the present invention and with the aid of the drawings, schematically showing:

figure 1 - cross section of a packaging laminate according to line 1-1, presented in figure 2;

figure 2 - manufacturing of the packaging laminate, shown in figure 1.

List of reference numbers:

10 laminate

11 PET film

14 a layer of polyurethane adhesive

16 aluminum foil

18 layer of polyurethane adhesive

20 PE sealing film

22 of the first coil

24 the second coil

26 the third coil

28 station microwave irradiation

30 fourth coil

Figure 1 shows a laminate 10, which, for example, can be used for the manufacture of standing packages for beverages, different printed PET film 12, representing the outer side of the aluminum foil 16 as a barrier layer and a sealant PE film 20, representing the inner side. PET film 12 is firmly connected with aluminum foil 16 through the first layer 14 of adhesive consisting of two-component polyurethane adhesive, and aluminum foil 16 is firmly connected with PE sealing film 20 through the second layer 18 of a two-component polyurethane adhesive. In a typical packaging laminate 10, the thickness of the PET film is, for example, 12 μm, the thickness of the aluminum foil 8-10 μm and the thickness of the sealing layer 90-100 microns.

Figure 2 shows the fabrication is of Aminata 10, shown in figure 1, by a triple layering that occurs when connecting PET film 12, the aluminum foil 16 and PE sealing film 20, and the bonding layers of the laminate through two layers 14, 18 adhesive in a single pass. Printed PET film 12 is unwound from the first spool 22 and continuously coated with adhesive 14. Aluminum foil 16 is served in the form of a tape from the second spool 24 to the PET film 12 coated with the adhesive 14, and a continuous layer on the PET film 12 with obtaining partial laminate. PE sealing film 20 unwound from the third coil 26 and cover with adhesive 18 is applied in the form of a tape to the partial laminate, and layer on the partial laminate in a continuous way, creating the packaging laminate 10. The packaging laminate 10 is passed through microwave irradiation station 28 corresponding capacity, providing for a fraction of a second curing both layers of adhesive 14, 18 by means of microwave radiation in a single pass. After exiting the station 28 microwave radiation of the packaging laminate 10 is wound on the fourth coil 30, after which it is ready for further processing to packaging.

The following are examples of laminates, in particular, suitable for packaging food products. Adhesives, connecting the individual layers of the laminate, are two-component polyurethane, edge the willows.

Examples of laminates

Polyester/adhesive/nylon/adhesive/polypropylene

Polyester/adhesive/nylon/adhesive/polyethylene

Polyester/adhesive/nylon/adhesive/polypropylene

Polyester/adhesive/nylon/adhesive/polyethylene

Polyester/adhesive/aluminum/adhesive/polypropylene

Polyester/adhesive/polypropylene

Polyester/adhesive/nylon/adhesive/nylon/adhesive/polypropylene

Podifier/adhesive/nylon/adhesive/nylon/adhesive/polyethylene

Polyester/adhesive/aluminum/adhesive/nylon/adhesive/polypropylene

1. Method of manufacturing a flexible laminate (10) for packaging, in which at least one plastic film (12) and at least another plastic film (20), metal foil (16) or paper as the layers of the laminate are combined by means of a polyurethane adhesive (14, 18) with subsequent application of energy to the laminate (10) for curing of the adhesive (14, 18),
characterized in that
the layers of the laminate (12, 16, 20) is continuously coated with adhesive (14, 18)formed from isocyanates, forming a cross connection, and high molecular weight alcohols, and connect with the formation of a laminate (10), followed by continuous irradiation of the laminate (10) microwaves.

2. The method according to claim 1, characterized in that the laminate (10) is additionally heated.

3. The method according to claim 1, characterized in that the irradiation process is used the canvas in the process of continuous winder roll.

4. The method according to claim 1, characterized in that the irradiation process is applied to the roll of laminate.

5. The method according to any one of claims 1 to 4, characterized in that the layers of the laminate (12, 16, 20) include plastic films of polyester, polyamide, polyvinyl chloride, polypropylene or polyethylene, aluminum foil or paper.

6. The method according to any one of claims 1 to 4, characterized in that the applied microwave energy is non-ionizing microwave radiation with a frequency from 300 MHz to 300 GHz, preferably radiation with a frequency of 2.45 GHz or 915 MHz.

7. The laminated packaging material manufactured by the method according to any one of claims 1 to 6 for the packaging of food and pharmaceutical products.

8. The laminated packaging material according to claim 7, characterized in that it includes two or more layers, preferably:
PET film (polyethylene terephthalate film)/adhesive/aluminum foil/adhesive/PP (polypropylene), or
PET film/adhesive/ASO(oriented polyamide)/adhesive/PP, or OPA film/adhesive/aluminum foil/adhesive/PVC (polyvinyl chloride).

9. The use of the laminated packaging material according to claim 7 or 8 for products processed in the autoclave.



 

Same patents:

FIELD: chemistry.

SUBSTANCE: invention relates to an adhesive composition for mutual attachment of two objects and a method of attaching an article to a substrate and can be used to attach articles to building walls and similar bases. The adhesive composition is double-packed in form of mounting set. The adhesive composition consists of a mixture of an aerobic adhesive substance and a hydrophilic material. The set has two containers for separate storage of the aerobic adhesive substance and the hydrophilic material. The adhesive aerobic substance is silane MS polymers. The method of attaching an object to a base using the adhesive composition involves mixing the aerobic adhesive substance with the hydrophilic substance, attaching the object by pressing a layer of the adhesive composition to the base and hardening the adhesive composition.

EFFECT: invention provides fast hardening of the adhesive layer and easier attachment of objects to each other.

8 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to moisture-cured hot-melt adhesives. Disclosed is a moisture-cured hot-melt adhesive composition containing at least one silane group-containing polyurethane prepolymer of formula (I), where R1 is an n-valent organic radical of prepolymer P, which is obtained from at least one polyol and at least one polyisocyanate and has at least n isocyanate groups, followed by removal of the n isocyanate groups; R2 is a C1-C10 alkyl group; R3 is a linear or branched C1-C10 alkylene group; X is a hydrolysable radical OR4, wherein R4 is a C1-C10 alkyl group which can contain 1 or 2 oxygen atoms of an ether; a equals 0, 1 or 2; n equals 2 or more; where the prepolymer of formula (I) is obtained from reaction of the polyurethane prepolymer P with a mercaptosilane of formula (II), wherein the prepolymer P is solid at room temperature and does not have an additional silane group, and the composition has longer storage life (viscosity stability) in uncured form. Disclosed also is a method for adhesive binding of substrates using the disclosed adhesive composition and an article obtained using the adhesive.

EFFECT: disclosed adhesive compositions do not form bubbles neither when heated nor during curing and have stable viscosity at high temperatures.

20 cl, 7 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to an aqueous polyurethane-polyurethane-urea dispersion which is used as a starting adhesive material in dispersion adhesives, as well as a method of producing such a dispersion, use thereof, adhesive compositions containing said dispersion and adhesive composite materials. The aqueous polyurethane-polyurethane-urea dispersion is composed of: A) one or more di- or higher functional polyols, having average molecular weight of 400-5000 Da, B) optionally one or more di- or higher functional polyol components, having molecular weight of 62-399 Da, C) one or more di- or higher polyisocyanate components, and D) a mixture (D) of primary and/or secondary monoamine compounds D1) and primary and/or secondary diamine compounds D2), wherein at least one of the components (D1) and/or (D2) contains sulphonate groups, wherein the average amine functionality of the mixture (D) is 1.65-1.95, and the equivalent ratio of NCO groups in the NCO prepolymer and total number of amine and hydroxyl groups of the mixture (D) which react with the isocyanate is equal to 1.04-1.9.

EFFECT: obtaining stable aqueous dispersions of adhesives without the need to use an emulsifying agent, films from which have improved initial thermal stability and high final thermal stability.

14 cl, 10 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: present invention relates to an aqueous polyurethane-polyurethane-urea dispersion which is used as a starting adhesive material in dispersion adhesives, as well as a method of producing such a dispersion, use thereof, adhesive compositions containing said dispersion and adhesive composite materials. The aqueous polyurethane-polyurethane-urea dispersion is composed of: A) one or more di- or higher functional polyols, having average molecular weight of 400-5000 Da, B) optionally one or more di- or higher functional polyol components, having molecular weight of 62-399 Da, C) one or more compounds which are monofunctional when reacting with a polyisocyanate and which have ethylene oxide content of at least 50 wt % and molecular weight of at least 400 Da, D) one or more di- or higher polyisocyanate components, and E) a mixture (E) of primary and/or secondary monoamine compounds E1) and primary and/or secondary diamine compounds E2), wherein at least one of the components (E1) and/or (E2) contains sulphonate groups, wherein the average amine functionality of the mixture (E) is 1.65-1.98, and the equivalent ratio of NCO groups in the NCO prepolymer and the total number of amine and hydroxyl groups of the mixture (E) which react with the isocyanate is equal to 1.04-1.9.

EFFECT: obtaining stable aqueous dispersions of adhesives without the need to use an emulsifying agent, films from which have improved initial thermal stability and high final heat stability.

14 cl, 4 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: adhesive composition contains a polyfunctional isocyanate, polyether polyol and a catalyst. The catalyst consists of at least one organic compound of iron and at least one chelating ligand. The multicomponent adhesive composition is prepared in form of at least two inter-reacting chemical components. One of the at least two inter-reacting chemical components contains a polyfunctional isocyanate and a catalyst, and the other contains polyether polyol. The multicomponent adhesive composition is used to produce articles from bound lignocellulose composite based on a lignocellulose substrate, especially for making oriented fibre panels.

EFFECT: invention enables to obtain articles using filler with high moisture content, which are structured at low pressing temperatures without reducing efficiency of the press.

4 tbl, 1 ex, 17 cl

FIELD: chemistry.

SUBSTANCE: moisture-curable and biodegradable adhesive which contains a reaction product of: (a) an isocyanate component having an average functionality of at least 2, the isocyanate component being selected from a group consisting of lysine diisocyanate and derivatives thereof, lysine triisocyanate and derivatives thereof, and combinations thereof; (b) an active hydrogen component having an average functionality greater than 2.1, the active hydrogen component containing a component with a hydroxyl functional group; and (c) an ionic salt component having an average hydroxyl or amino functionality, or combination thereof, of at least 1, selected from a group consisting of ammonium salts, halides, sulphonates, phosphonates, carboxylates and combinations thereof.

EFFECT: obtaining a moisture-curable and biodegradable adhesive.

18 cl, 1 dwg, 17 ex

FIELD: chemistry.

SUBSTANCE: adhesive polyurethane composition consists of a prime coat and polyurethane adhesive, comprising urethane rubber and ethyl acetate, applied on its surface. The prime coat consists of a solution of polyurethane thermoplastic elastomer with ethyl acetate in ratio: polyurethane thermoplastic elastomer 10-18 wt % and ethyl acetate - the balance. The polyurethane adhesive contains a solution of polyurethane thermoplastic elastomer and a mixture of polar organic solvents consisting of ethyl acetate and methylene chloride, with the following ratio of components: polyurethane thermoplastic elastomer 17-27 wt %; methylene chloride 7-10 wt % and ethyl acetate - the balance. The polyurethane adhesive can contain perchlorovinyl resin as a target additive in amount of 0-10% to the total weight of the adhesive.

EFFECT: low cost and improved adhesion properties of the adhesive composition and cohesion strength characteristics of the adhesive joints.

2 cl, 2 tbl

FIELD: chemistry.

SUBSTANCE: composition contains the following in pts.wt: 100 bifunctional prepolymer with terminal isocyanate groups, 10.6-12.8 - 3,3'-dichloro-4,4'-diaminodiphenylmethane, 15.9-19.2 dioctylsebacate, 1.2-1.4 - 1,4-butanediol, 0.31-0.35 - para-phenylenediamine and 0.015-0.030 - Agidol 51,52,53 (mixture of 2-dimethylaminomethylphenol, 4-dimethylaminophenol, 2,6-bis (dimethylaminomethyl)phenol, 2,4-bis-(dimethylaminomethyl)phenol,2,4,6-tris-dimethylaminomethyl)phenol.

EFFECT: obtaining a fixing composition which, after prolonged storage, retains strength and adhesion parameters vital for operation of charges of antitank grenades at both high and low temperatures, and also prevents accidental exposure to substances which are harmful to health of personnel, in cases of technical faults and emergencies.

3 tbl

FIELD: transport.

SUBSTANCE: invention relates to method for covering light airplanes with polyester sheathing fabric, as well as to dispersive hot-gluing glue and its application for covering. For covering, polyester sheathing fabric with longitudinal shrinkage of 7% and transversal shrinkage of 5% at 160-180°C is used. In the process of covering light airplanes and/or their parts consisting of frame system, sheathing fabric in the area of its overhangs and frame parts is covered by dispersive hot-gluing glue and wrapped around longeron part of frame so that when connection between sheathing fabric and frame produced by glue is destructed the fabric could be held on frame carcass. Dispersive hot-gluing glue contains 80-88% of adhesive, 12-15% of hardener and 0.15-0.3% thickener, and the glue is polymerised at temperatures >40°C. The hardener contains 54-60% of solvent, 0.35-0.5% of naphthalensulfonic acid sodium salt-based stabiliser, 0.25-0.35% of propoxylated spirit-based emulsifier, 1.7-1.9% of polyetheramines-based hardener, 37-41% of polyisocyanate.

EFFECT: reliability and durability of light airplanes and/or their parts covering.

15 cl, 3 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to aldimines of formula (I)

where A does not contain active hydrogen and a primary amine group, or together with R7 denotes a (n+2)-valent hydrocarbon radical containing 3-20 carbon atoms and, if necessary, at least one heteroatom in form of oxygen of an ether group or nitrogen or a tertiary amine group; n equals 1, 2, 3 or 4; m equals 0,1, 2, 3 or 4; R1 and R2 each denotes a univalent hydrocarbon residue with 1-12 carbon atoms or together denote a divalent hydrocarbon radical which is part of a carbocyclic ring with 5-8 carbon atoms; R3 denotes H or alkyl; R4 and R5 independently denote CH3 or a univalent aliphatic radical containing 2-12 carbon atoms and optionally hydroxy groups; X denotes O, S, N-R6, or N-R7, where R6 denotes a univalent hydrocarbon radical containing 1-20 carbon atoms and having at least one hydroxy group; as well as curable compositions containing such aldimines and use of said compositions.

EFFECT: obtaining novel aldimines which can be used as curing agents in curable compositions.

22 cl, 18 ex, 6 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of plywood articles yielding to subsequent forming, method of its fabrication and self-adhesives. Proposed article is produced by jointing plywood sheets together. Note here that said sheets are jointed by self-adhesive made of polyolefin film. Note here that said polyolefin film comprises polyolefin functionalised by maleic acid derivative and including reactive groups of maleic anhydride capable of reacting with OH-groups of wood to form covalent bonds between sheet and film. Note also that said polyolefin film comprises, at least three layers and outer layers 1, 2 represent self-adhesive layers reacting with OH-groups of wood.

EFFECT: higher quality, duration and stability.

16 cl, 2 dwg, 3 ex

Protective coating // 2470967

FIELD: radio engineering.

SUBSTANCE: protective coating includes at east two layers of polymer nanofibres fastened by radiotransparent material. A film of hydrogenated carbon is vacuum sputtered onto each layer of polymer nanofibres, said film having embedded particles of a ferromagnetic or ferrimagnetic material. Content of particles of ferromagnetic or ferrimagnetic material is equal to 0.5-10 wt % in the film deposited on the outer layer of polymer nanofibres, and up to 80-100 wt % in the film deposited on the layer of polymer nanofibres adjoining the protected surface. The direction of polymer nanofibres of one layer and the direction of polymer nanofibres in the neighbouring layer form an angle φ, which is equal to 180°/N, where N is the number of layers of polymer nanofibres.

EFFECT: stealthiness in the acoustic frequency band while maintaining a wide frequency band and high efficiency of microwave absorption.

14 cl, 4 dwg, 6 tbl

FIELD: chemistry.

SUBSTANCE: disclosed is a polyurethane adhesive for laminating films. The polyurethane adhesive for laminating films contains at least one NCO-reactive polyurethane prepolymer and/or polyisocyanates and is cross-linked only through NCO-/acidic H groups. The adhesive is characterised by that it contains between 0.5 and 20 wt % low-molecular weight compound (A) having molecular weight lower than 2000 g/mol, which contains at least one group which is reactive with respect to primary amine groups, selected from an epoxy group, oligomeric polyethers of unsaturated carboxylic acids or vinylphosphonic acid, wherein compound (A) reacts with primary amine groups at a rate slower than the rate of the cross-linking reaction. Disclosed also is use of said adhesives in a method of producing laminated multilayer films which are glued using the disclosed polyurethane adhesives.

EFFECT: films glued using said adhesive contain a negligible amount of aromatic amines capable of migrating.

13 cl, 3 ex

FIELD: process engineering.

SUBSTANCE: invention relates to pre-stretched multilayer films, fixers, webs, etc. Proposed article comprises at least two layers, one low-crystalline and one high-crystalline layers. Low-crystalline layer comprises low-crystalline olefin (co)polymer while high-crystalline layer comprises high-crystalline olefin (co)polymer with melting point below that of low-crystalline olefin (co)polymer. Difference between crystallinity of both (co)polymers makes at least 1 wt%. Article allows elongation at temperature below low-crystalline polymer melting point in at least one direction to elongation degree making at least 50% of its initial length or width. Preferably, high-crystalline layer should be subjected to plastic deformation after elongation.

EFFECT: pre-stretched multilayer articles.

49 cl, 4 dwg, 3 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to production of polymer film labels. Label consists of polymer film (A) containing styrene components with top and bottom surface and features water vapor penetration rate varying from about 15 to 150 g/m2/day, and water-based adhesive component in contact with film bottom surface. Said labels are applied on glass, metal or plastic substrate by side containing water-based adhesive component, and, thereafter, dried.

EFFECT: higher efficiency of production.

25 cl, 2 tbl, 15 ex

FIELD: construction.

SUBSTANCE: invention relates to transparent mounting sheet of electronic device display window onto surface of display with the possibility of removal and to structure for mounting of detachable protective panel. Transparent mounting sheet of protective panel installation (1, 71) consists of single-sided detachable sheet (3) from central element (3a) of thin layer of transparent plastic, sheet of silicon rubber or sheet of urethane rubber (3c, 13c), which is pressed to previously processed surface, formed by one of surfaces of central element, exposed to treatment with corona discharge or application of intermediate agent, and able of entering in contact with one of protective panels (1, 71) for window of display (6) of electronic device, and also layer (3d) of acrylic adhesive substance, applied onto other surface of central element, and also gel sheet (4), at least one of surfaces of which is joined to layer of acrylic adhesive substance, as a result of which the error that occurs between rated distance between back external surface of protective panel and surface of display and distance between back external surface of protective panel and surface of display, produced in assembly of sheet, may be compensated, and in which thickness of transparent mounting sheet is more than rated distance between back external surface of protective panel and surface of display, at the same time thickness of layer of plastic, forming central element (3a) makes 12-75 mcm, layer (3d) of acrylic adhesive substance has thickness of 10-50 mcm, sheet of silicon rubber or sheet of urethane rubber has thickness of 20-100 mcm, gel sheet (4) has thickness of 0.2-10 mm.

EFFECT: compensation of error of distance between back external surface and surface of display, and also adhesion without bubbles of protective panel of electronic device.

6 cl, 3 ex, 15 dwg

FIELD: chemistry.

SUBSTANCE: sheet contains base material and a pressure-sensitive layer. End-to-end holes which run from the front surface of the base material to the working surface of the adhesive layer are made in the pressure-sensitive adhesive sheet through laser thermal treatment. The base material used is material which, when heated at a rate of temperature increase of 20°C/min in a nitrogen atmosphere, temperature at peak thermal decomposition where thermal decomposition of this material is maximum does not exceed 450°C, and the difference between the peak thermal decomposition temperature of the base material and the melting peak temperature does not exceed 250°C. The base material is a film based on a synthetic resin, a foamed film or a laminated film.

EFFECT: prevention of capture of air and therefore prevention of formation of bubbles after gluing the sheet.

5 cl, 6 ex, 3 tbl, 10 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to an adhesive system which is an adhesive composition and which can be used for gluing wood-based elements, and to a method of obtaining the said adhesive system. The adhesive system contains at least partially helium-saturated starch and a polymer (P) which is an acetoacetylated polyvinyl alcohol. The adhesive system also contains a polymer or copolymer which contains primary amino- or amido groups. The adhesive composition is obtained by mixing starch and polymer (P), which is an acetoacetylated polyvinyl alcohol. The adhesive composition can be used as an adhesive system for gluing wood-based material elements. The wood-based material elements can be sheet materials or wood chips.

EFFECT: invention enables use of the adhesive system to obtain wood-based products through application of the adhesive system and gluing, such as laminated or facing materials or moulded slabs.

8 cl, 3 tbl, 5 ex

FIELD: process engineering.

SUBSTANCE: invention relates to multi-component structure, for example multi-layer film that comprises at least first and second components with jointing layer arranged directly there between. Note here that jointing layer comprises at least one copolymer of olefine and unsaturated ether of carbonate acid and at least one photoinitiator wherein at least first component comprises vinylidene chloride polymer or combination of vinylidene chloride polymers that make prevailing ingredient with structure that features increased interlayer adhesion as measured in compliance with ASTM F904-98 at 93 °C after irradiation by UV-radiation and as compared with interlayer adhesion prior to irradiating by UV radiation. Invention relates to method of preparing food that comprises enveloping food in multi-layer packing structure to be subjected to increased temperature sufficient for food preparation, and to method of gluing first layer to second layer in multi-layer film that comprises extruding first and second layer together. Note here that first layer comprises at least 80% of vinylidene chloride polymer and third layer arranged between said first and second layers. Third layer comprises basic polymer including olefine copolymer and that of unsaturated carbonate acid ether and at least one photoinitiator. Said method comprises also forming film and UV irradiation of the latter.

EFFECT: increased adhesion between first and second layer.

18 cl, 5 tbl, 21 ex

FIELD: construction industry.

SUBSTANCE: material includes base and flexible film the front surface of which is attached to base by means of adhesive; attachment point located near the end of extensible sandwich material; and activation area located on the inside of attachment point. Adhesive is applied in activation area in the form of set of straps separated from each other. Ratio of strap width and distance between neighbouring straps in the part of activation area is approximately 0.33 to 1. Method consists in mechanical activation of intermediate sandwich structure in activation area at deformation speed which is more than or equal to approximately 100 s-1.

EFFECT: material obtained with such method contains decreased quantity of adhesive at maintaining delamination force and creep resistance criteria, and is used for manufacturing non-reusable absorbing products.

20 cl, 1 tbl, 19 dwg

FIELD: process engineering.

SUBSTANCE: invention relates to production of plywood articles yielding to subsequent forming, method of its fabrication and self-adhesives. Proposed article is produced by jointing plywood sheets together. Note here that said sheets are jointed by self-adhesive made of polyolefin film. Note here that said polyolefin film comprises polyolefin functionalised by maleic acid derivative and including reactive groups of maleic anhydride capable of reacting with OH-groups of wood to form covalent bonds between sheet and film. Note also that said polyolefin film comprises, at least three layers and outer layers 1, 2 represent self-adhesive layers reacting with OH-groups of wood.

EFFECT: higher quality, duration and stability.

16 cl, 2 dwg, 3 ex

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