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Adhesive composition, adhesive layer and adhesive sheet for optical element and optical element

A technology for optical elements and compositions, applied in the direction of polarizing elements, adhesive types, ester copolymer adhesives, etc., can solve the problems of difficulty in fully satisfying durability and re-peelability, and prevent floating and peeling. Effect

Active Publication Date: 2008-09-17
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, even with the adhesive sheet for glass plates described in Japanese Patent Application Laid-Open No. 2002-309212, it is difficult to fully satisfy all of the above-mentioned physical properties such as durability and re-peelability required in this application.

Method used

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  • Adhesive composition, adhesive layer and adhesive sheet for optical element and optical element
  • Adhesive composition, adhesive layer and adhesive sheet for optical element and optical element
  • Adhesive composition, adhesive layer and adhesive sheet for optical element and optical element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Add 70 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of butyl acrylate, 1 part by weight and 0.07 part by weight of 3-propenoxypropyltriethoxysilane were emulsified with a homomixer to prepare an emulsion.

[0093] Then, after replacing the four-necked flask equipped with a nitrogen introduction tube, a condenser tube, and a thermometer with nitrogen for 1 hour, 30 parts by weight of water and 2,2'-azobis[N-(2-carboxyethyl ether) were added to the four-necked flask. Base)-2-methylpropionamidine]hydrate (VA-057, manufactured by Wako Pure Chemical Industries, Ltd.), 0.1 part by weight was added dropwise to the emulsion obtained above at 59° C. for 4.5 hours to carry out emulsion polymerization. After the polymerization, ammonia was added to adjust the pH to 8 to obtain an acrylic polymer emulsion A1.

[0094] Next, 0.2 parts by weight of 3-glycidoxypropyltriethoxysilane (KBE-403, manufactured by Shin-Etsu Chemical Co., Ltd.) was added to 100 parts by weigh...

Embodiment 2

[0098] Except that Aquaron HS-10 (reactive emulsifier, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) was changed to Aquaron HS-20 (reactive emulsifier, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.), the same operation was performed as in Example 1, Acrylic polymer emulsion A2 was obtained.

[0099] Then, corresponding to 100 parts by weight of the solid content of the acrylic polymer emulsion A2, 0.2 parts by weight of 3-glycidoxypropyltriethoxysilane (KBE-403, manufactured by Shin-Etsu Chemical Co., Ltd.) was added, An adhesive composition for optical elements was obtained.

[0100] Hereinafter, the pressure-sensitive adhesive sheet for optical elements and an optical element were obtained by operation similar to Example 1.

[0101] The gel component of the pressure-sensitive adhesive sheet for optical elements was 71% by weight.

Embodiment 3

[0103] 70 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of butyl acrylate, 1 part by weight, emulsified with a homomixer to prepare an emulsion.

[0104] Then, after replacing the four-necked flask equipped with a nitrogen introduction tube, a condenser tube, and a thermometer with nitrogen for 1 hour, the obtained emulsion and 2,2'-azobis[N-(2-carboxyethyl 0.03 parts by weight of )-2-methylpropionamidine]hydrate (VA-057, manufactured by Wako Pure Chemical Industries, Ltd.), was subjected to emulsion polymerization at 56° C. for 3.5 hours (concentrated polymerization portion).

[0105] Then, 70 parts by weight of 2-ethylhexyl acrylate, 30 parts by weight of butyl acrylate, 1 part by weight of acrylic acid, 2 parts by weight of Aquaron HS-10 (reactive emulsifier, manufactured by Daiichi Kogyo Pharmaceutical Co., Ltd.) and An emulsion was prepared with 30 parts by weight of water, and this emulsion was added dropwise at 59°C over 2.5 hours to perform emulsion pol...

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Abstract

To prepare an adhesive layer for an optical member, which prevents floating and peeling by change of a temperature and humidity environment, has excellent durability of heat resistance and moisture resistance and is readily releasable even in preservation after long-time passage and in a high-temperature and high-humidity environment after adhesion of an optical part, to prepare an adhesive sheet for an optical member, which is equipped with the adhesive layer for an optical member, to obtain an adhesive composition for an optical member, which is used for obtaining the adhesive layer for an optical member, and to provide an optical member having an optical part arranged on the adhesive layer for an optical member.The adhesive composition for an optical member comprises an acrylic polymer emulsion obtained by subjecting an emulsion composed of a monomer mixture having >=80 wt.% of a (meth) acrylic acid ester, a reactive emulsifying agent and a polymerization initiator to emulsion polymerization and 0.01-1 pt.wt., based on 100 pts.wt. of the solid content of the acrylic polymer emulsion, of a silane coupling agent, and the adhesive composition is applied to a substrate and dried to give the adhesive layer for the optical member.

Description

technical field [0001] The present invention relates to an adhesive composition for an optical element, an adhesive layer for an optical element, an adhesive sheet for an optical element, and an optical element, and more particularly to an optical film for laminating optical parts such as a polarizing plate, a phase difference plate, and an elliptical polarizing plate. The adhesive composition, the adhesive layer for an optical element, the adhesive sheet for an optical element, and an optical element in which the adhesive layer for an optical element is provided on an optical component. Background technique [0002] Optical elements used in liquid crystal display devices such as flat panel displays, such as polarizers and retardation plates, are bonded to liquid crystal elements with an adhesive. Adhesives used for this purpose usually expand and contract due to changes in the temperature and humidity environment, and the optical element tends to float and peel off from the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J133/00G02B5/30C09J7/02C09J133/04C09J133/06C09J183/04
CPCC09J11/06C09J133/06C09J2203/318G02B5/30
Inventor 矢野浩平诸石裕中野史子
Owner NITTO DENKO CORP