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Adhesive for gas barrier laminates and laminated films

A technology for laminated products and adhesives, applied in the field of multi-layer packaging materials, packaging bags, and laminated films, can solve the problems of high production cost of laminated films, inconvenient lamination process, and low gas barrier properties.

Inactive Publication Date: 2004-12-01
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the polyurethane-based adhesives mentioned above and the epoxy-based adhesives proposed in WO 99 / 60068 all have low gas barrier properties
Therefore, when these adhesives are used in packaging materials requiring high gas barrier properties, it is necessary to separately laminate additional various gas barrier layers such as PVDC coating, polyvinyl alcohol (PVA) coating, ethylene-vinyl alcohol copolymer (EVOH) thin film layer, m-xylylene adipamide (m-xylyleneadipamide) thin film layer and vapor deposited aluminum oxide (Al 2 o 3 ), silicon dioxide (Si) and other inorganic substances to deposit thin film layers, which lead to high production costs of laminated films, or inconvenient lamination processes

Method used

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  • Adhesive for gas barrier laminates and laminated films
  • Adhesive for gas barrier laminates and laminated films
  • Adhesive for gas barrier laminates and laminated films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] An epoxy resin containing 50 parts by weight of an epoxy resin having a glycidylamine moiety derived from m-xylylenediamine ("TETRAD-X", purchased from Mitsubishi Gas Chemical Co., Ltd.) and 115 parts by weight of an epoxy resin were cured A 1:1 methanol / ethyl acetate solution of Agent A (solid content: 30% by weight) was mixed with 0.02 parts by weight of an acrylic wetting agent "BYK381" (purchased from BYK Chemie GmbH) and stirred together closely to prepare a coating solution.

[0114] The resulting coating solution was coated with a No. 3 scraper rod at 3 g / m 2 (solid content) coating amount applied to the surface of a 20 μm thick stretched polypropylene film, dried at 85 for 10 seconds, laminated with a 30 μm thick polypropylene film using a nip roll, and then aged at 35 1 day to obtain a laminated film. It was confirmed that the content of the skeleton structure represented by formula (1) in the formed adhesive layer (cured product of epoxy resin) was 59.5% by w...

Embodiment 2

[0116] The same procedure as in Example 1 was performed to prepare a laminated film, except that 142 parts by weight of epoxy resin curing agent B was used instead of epoxy resin curing agent A. As a result, it was confirmed that the content of the skeleton structure represented by formula (1) in the adhesive layer of the laminated film was 59.8% by weight. The resulting laminated film was tested to evaluate its gas barrier properties and the like. The results are shown in Table 1.

Embodiment 3

[0118] The same procedure as in Example 1 was performed to prepare a laminated film, except that 163 parts by weight of epoxy resin curing agent C was used instead of epoxy resin curing agent A. As a result, it was confirmed that the content of the skeleton structure represented by formula (1) in the adhesive layer of the laminated film was 60.2% by weight. The resulting laminated film was tested to evaluate its gas barrier properties and the like. The results are shown in Table 1.

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Abstract

The present invention provides an adhesive for laminates containing, as a main component, an epoxy resin composition comprising an epoxy resin and an epoxy resin-curing agent, the epoxy resin composition being formed into an epoxy resin cured product containing a skeleton structure represented by the formula (1): in an amount of at least 40% by weight. Since the adhesive of the present invention reveals not only a suitable adhesion to various film materials but also a high gas-barrier property, only a single layer formed therefrom can realize both an excellent gas-barrier property and an excellent adhesion property in combination, so that it is possible to produce a high gas-barrier laminated film for a packaging material without forming a separate gas-barrier layer therein.

Description

technical field [0001] The present invention relates to an adhesive for laminated products having high gas barrier properties and suitable adhesion to film materials such as various polymers, paper and metal, and laminated films and multilayer packaging materials using the adhesive and bags. Background technique [0002] In recent years, packaging materials are mainly produced from composite flexible films made of combinations of different kinds of polymer materials because of the strength of the composite flexible films, performance of preserving goods, workability, advertising effects provided by printing, etc. . A composite flexible film is generally composed of a thermoplastic resin film or the like, which functions as an outer layer of a product to be protected, and another thermoplastic resin film or the like, which functions as a sealing layer. By dry lamination (in which the sealing layer is bonded to the laminated film layer by an adhesive applied to the laminated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/12B32B17/10B32B27/36C08G59/50C08L63/00C08L79/02C09J163/00C09J179/02
CPCB32B17/10018C08G59/5033B32B7/12C09J179/02C08L63/00B32B27/36C08L79/02C09J163/00C08L2666/20C08L2666/22
Inventor 沓名贵昭木原秀太
Owner MITSUBISHI GAS CHEM CO INC
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