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Gas barrier adhesive, film and gas barrier film

A technology of adhesives and gas barrier properties, which is applied in the fields of thin films, gas barrier films, and gas barrier adhesives. It can solve the problems of damage to the appearance of films, poor ink resolvability, and difficulty in coating, etc., and achieve excellent The effect of appearance and excellent adhesive strength

Active Publication Date: 2018-08-03
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the viscosity of the polyester polyols disclosed among these is very high. As disclosed in Patent Document 2, unless it is diluted with an organic solvent such as ethyl acetate, it is particularly difficult to achieve coating on metal surfaces such as vapor-deposited films and aluminum foils.
In recent years, there has been a high demand for so-called solvent-free adhesives that do not contain volatile organic solvents, especially from the viewpoint of reducing environmental burdens and improving the work environment. From this point of view, the aforementioned patent documents 1 and 2 disclose There is room for improvement in the application of polyester polyols as solvent-free adhesives
[0005] On the other hand, since solventless adhesives have a large proportion of low-molecular-weight ester components that easily dissolve ink, they suffer from poor ink redissolution resistance and impair film appearance.

Method used

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  • Gas barrier adhesive, film and gas barrier film
  • Gas barrier adhesive, film and gas barrier film
  • Gas barrier adhesive, film and gas barrier film

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Embodiment

[0083]

[0084] Next, the present invention will be specifically described by way of examples and comparative examples. In the examples, unless otherwise specified, "parts" and "%" are based on mass.

manufacture example 1

[0085] (Manufacturing example 1) Polyester polyol (A) "EGoPA3MA70.9K" made of ethylene glycol, phthalic anhydride, and maleic acid

[0086] 851.3 parts of ethylene glycol, 474.15 parts of phthalic anhydride, 732.3 parts of maleic anhydride, and tetraisopropanol were put into a polyester reaction vessel equipped with a stirrer, a nitrogen introduction tube, a Snyder tube, and a condenser. 0.10 part of titanium was slowly heated so that the temperature of the upper portion of the rectifying tube did not exceed 100°C, and the internal temperature was kept at 200°C. When the acid value becomes below 5.0mgKOH / g, the esterification reaction is completed, and the design functional group number N=2, the hydroxyl value=125, the theoretical number average molecular weight calculated according to the hydroxyl value is 900, and the viscosity at 60°C is 25000mPa· s polyester polyol (A) "EGoPA3MA7 0.9K".

manufacture example 2

[0087] (Manufacturing example 2) Polyester polyol (A) "EGoPA1AA90.85K" made of ethylene glycol, phthalic anhydride, and adipic acid

[0088] In a polyester reaction vessel equipped with a stirrer, a nitrogen gas introduction pipe, a Snyder tube, and a condenser, 703.62 parts of ethylene glycol, 131.22 parts of phthalic anhydride, 1165.19 parts of adipic acid and 0.10 part of titanium tetraisopropoxide were added, Heating was performed gradually so that the temperature of the upper portion of the rectifying tube did not exceed 100°C, and the inner temperature was kept at 200°C. When the acid value becomes below 5.0mgKOH / g, the esterification reaction is completed, and the number of designed functional groups N=2, the hydroxyl value=135, the theoretical number average molecular weight calculated according to the hydroxyl value is 850, and the viscosity at 60°C is 850mPa. s polyester polyol (A) "EGoPA1AA9 0.85K".

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Abstract

A gas barrier adhesive that contains a base material containing a polyester polyol (A), which is a reaction product of a polyol component (D) and an acid component (E1) containing an ortho-directing aromatic dicarboxylic acid or an acid anhydride thereof, and a diluent (C) that is composed of a bi- or higher functional liquid alcohol, and a curing agent containing a polyisocyanate compound (B), and wherein the base material has a viscosity of 10,000 mPa.s or less at 60 DEG C; a film to which this gas barrier adhesive is applied; and a gas barrier film which uses this film.

Description

technical field [0001] The present invention relates to a gas barrier adhesive, a film and a gas barrier film. Background technique [0002] Oxygen barrier properties or water vapor barrier properties are often required for packaging materials used in packaging of foods, beverages, etc., from the viewpoint of protection of contents, extension of shelf life, and the like. In order to meet these needs, transparent vapor-deposited films on which inorganic substances such as silica and alumina are vapor-deposited, or laminated films combined with aluminum foil are used in the construction of flexible packaging. [0003] However, since the vapor-deposited thin film generally has a few vapor-deposition defects, there are problems such as imperfect barrier properties, cracks, etc., and poor handling properties. In addition, although aluminum foil is a perfect barrier to inert gas, there are problems such as being difficult to use and expensive from the viewpoint of recycling. [...

Claims

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Application Information

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IPC IPC(8): C09J175/06B32B27/00B32B27/40C08G18/66C09J7/30C09J7/20
CPCB32B27/00B32B27/40C08G18/66C09J175/06C09J7/20
Inventor 手岛常行近藤明宏武田博之笹本茜户田哲也
Owner DIC CORP
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