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Adhesive agent composition

A composition and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, adhesives, etc., can solve problems such as insufficient capacity, and achieve less change over time, excellent whitening inhibition ability, and reworkability. excellent effect

Active Publication Date: 2013-04-03
NIPPON CARBIDE KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no description about white spots in Patent Document 2, and the ability to suppress white spots is not sufficient if only the above-mentioned structure is provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0085] Hereinafter, although an Example demonstrates in detail, this invention is not limited to these Examples. In addition, preparation of the test piece used in the Example, various test methods, and evaluation methods are as follows.

[0086] (1) Preparation of optical film for test

[0087] As an example of an optical film, a polarizing film is used, and a polarizing film having an adhesive layer is produced. Apply the adhesive composition on the release film surface-treated with a silicone-based release agent so that the coating amount after drying becomes 25 g / cm 2 . Next, it dried at 100 degreeC for 90 second with the hot-air circulation type dryer, and formed the adhesive layer. Next, attach the adhesive layer to the back of the polarizing base film [a film in which triacetyl cellulose (TAC) films are laminated on both sides of a polarizer mainly composed of polyvinyl alcohol (PVA) films; about 190 μm] , crimping by pressurized rollers. After crimping, aging was ...

manufacture example 1）

[0121] Add 99 parts by weight of n-butyl acrylate (BA), 1 part by weight of acrylic acid (AA), 100 parts by weight of ethyl acetate (EAc) and 0.1 parts by weight of Parts of azobisisobutyronitrile (AIBN), and replace the air in the reaction vessel with nitrogen. Thereafter, the temperature of the contents of the reaction vessel was raised to 65° C. under a nitrogen atmosphere with stirring, and the mixture was reacted for 8 hours. After completion of the reaction, the reaction mixture was diluted with ethyl acetate to obtain an acrylic copolymer solution having a solid content of 16.8% by weight. The weight average molecular weight of the acrylic polymer was 1.67 million.

manufacture example 2）

[0123] Add 83.5 parts by weight of n-butyl acrylate (BA), 15 parts by weight of tert-butyl acrylate (t-BA), 0.5 parts by weight of acrylate-2- Hydroxyethyl ester (2HEA), 1 part by weight of acrylic acid (AA), 100 parts by weight of ethyl acetate (EAc), and 0.1 part by weight of azobisisobutyronitrile (AIBN), and the air in the reaction vessel was replaced with nitrogen. Thereafter, the temperature of the contents of the reaction vessel was raised to 65° C. under a nitrogen atmosphere with stirring, and the mixture was reacted for 8 hours. After completion of the reaction, the reaction mixture was diluted with ethyl acetate to obtain an acrylic copolymer solution having a solid content of 19.7% by weight. The weight average molecular weight of the acrylic polymer was 1.46 million.

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Abstract

To provide an adhesive agent composition that is used in the adhesion of an optical film, exhibits superior durability even in high-temperature high-humidity environments, and has an excellent ability to suppress white spots from arising. [Solution] The adhesive agent composition contains: a (meth)acrylic copolymer (A) containing a carboxyl group; a (meth)acrylic copolymer (B) containing a carboxyl group and a hydroxyl group; 5-20 parts by weight of a tolylene diisocyanate compound (C) for every total of 100 parts by weight of the (meth)acrylic copolymers (A and B); and an epoxy-group-containing silane coupling agent (D).

Description

technical field [0001] The present invention relates to an adhesive composition used when bonding optical films such as polarizing films and retardation films to adherends such as liquid crystal cells. More specifically, the present invention relates to an adhesive composition that exhibits excellent durability even under high temperature and high humidity and is excellent in whitening suppression ability. Background technique [0002] A liquid crystal display device is generally composed of a liquid crystal cell in which a liquid crystal component aligned in a predetermined direction is sandwiched between two support substrates such as glass, and optical films such as polarizing films, retardation films, and brightness enhancement films. An adhesive is often used when laminating these optical films and bonding the optical film to a liquid crystal cell. [0003] Liquid crystal display devices are widely used as display devices for personal computers, televisions, car naviga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/14C09J11/06C09J11/08C09J175/04C09J183/04C09J7/10
CPCC08G77/14C08G18/4081C09J175/04C08G18/6492C08G18/6254C09J133/06C08K5/5435C08G18/289C09J2433/00C08L33/068C08L33/14C09J7/10C09J2301/124C09J133/14C09J11/06C09J183/04
Inventor 米田庸佑服部慎也中野宏人齐藤雅仁
Owner NIPPON CARBIDE KOGYO KK
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