Acrylic adhesive, adhesive sheet for polarizing film that uses the same, and adhesive polarizing film

An adhesive, acrylic technology, applied in the direction of adhesive types, pressure-sensitive films/sheets, non-polymer adhesive additives, etc., can solve the problems of poor copolymerization, poor compatibility, and decreased adhesion. , to achieve excellent durability, reduce birefringence, and prevent light leakage

Inactive Publication Date: 2012-01-25
SOKEN CHEM & ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in general, structures with higher positive intrinsic birefringence have molecular structures with higher planarity, and thus exhibit higher crystallinity , so when a cross-linking agent having a high positive intrinsic birefringence including such a relatively planar naphthalene structure etc. is added in excess to the extent that light leakage is eliminated, the compatibility with the binder polymer will be Deterioration, resulting in whitening of the coating film, decrease in adhesion, or peeling over time
In addition, even in the copolymerization of monomers, when a large amount of monomers having a positive intrinsic birefringence is used, the copolymerizability deteriorates and workability deteriorates, or the glass transition temperature of the binder polymer The rise of the film will cause the coating to harden, which may cause a decrease in the adhesion

Method used

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  • Acrylic adhesive, adhesive sheet for polarizing film that uses the same, and adhesive polarizing film
  • Acrylic adhesive, adhesive sheet for polarizing film that uses the same, and adhesive polarizing film
  • Acrylic adhesive, adhesive sheet for polarizing film that uses the same, and adhesive polarizing film

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1

[0083] Preparation of acrylic polymer:

[0084] Add 73 parts of n-butyl acrylate (BA), 25 parts of benzyl acrylate (BzA), and 2 parts of 2-hydroxyethyl acrylate (2HEA) to a reaction device equipped with a stirrer, a reflux cooler, a thermometer, and a nitrogen introduction tube. And 150 parts of ethyl acetate, and 0.2 part of azobisisobutyronitrile (AIBN), polymerized at 68°C for 8 hours in a nitrogen gas stream to obtain a weight average molecular weight (Mw) of 1.1 million and a molecular weight distribution (weight average molecular weight) (Mw) / number average molecular weight (Mn)) 35 solution of acrylic polymer A-1. In addition, Mw and Mn are obtained by the following measurement method.

[0085] (Mw and Mn measuring method)

[0086] The weight average molecular weight (Mw) and the number average molecular weight (Mn) in terms of standard polystyrene are determined by gel permeation chromatography (GPC) under the following conditions.

[0087]

[0088] Device: HLC-8120 (manufac...

manufacture example 2

[0097] Except that the composition of the comonomer was replaced with 88 parts of BA, 10 parts of BzA, and 2 parts of 2HEA, the rest was the same as in Production Example 1, and a solution of acrylic polymer A-2 was obtained. The Mw of this polymer was 1.1 million, and the molecular weight distribution (Mw / Mn) was 35.

manufacture example 3

[0099] Except that the composition of the comonomer was replaced with 23 parts of BA, 75 parts of BzA, and 2 parts of 2HEA, it was the same as in Production Example 1, and a solution of acrylic polymer A-3 was obtained. The Mw of this polymer was 1.1 million, and the molecular weight distribution (Mw / Mn) was 35.

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Abstract

Disclosed is an acrylic adhesive that features superior durability and light leakage prevention, even under harsh ambient use conditions. Said acrylic adhesive contains constituents (A) through (C): (A) an acrylic polymer obtained by copolymerizing the following monomers: (a-1) a (meth)acrylic acid ester, (a-2) a monomer containing an aromatic ring, and (a-3) a monomer containing a functional group, wherein the content of the monomer (a-2) is 3-50% by mass with respect to the total quantity of the monomers (a-1) and (a-2), (B) a polyfunctional isocyanate compound (C) an aromatic ring-containing spacer compound with an isocyanate group-reactive functional group, wherein the equivalence ratio of the isocyanate group-reactive functional groups in constituent (C) with respect to the isocyanate groups in constituent (B) is 0.01-0.60, and the photoelastic coefficient of the adhesive layer formed thereby is not less than 100 10-12 m2/N and not more than 1000 10-12 m2/N.

Description

Technical field [0001] The present invention relates to an adhesive with optical compensation function, and in more detail, to an acrylic adhesive capable of reducing birefringence by controlling the photoelastic coefficient, thereby effectively preventing light leakage, and an acrylic adhesive using the acrylic adhesive Agent's polarizing film. Background technique [0002] The liquid crystal element has a structure in which a liquid crystal material is sandwiched between two substrates, and a polarizing plate is attached to the surface of the substrate through an adhesive layer. In recent years, liquid crystal elements have been expanded for use in vehicles, outdoor meters, personal computer monitors, televisions, and other applications. With this, the use environment has become too harsh. Therefore, the adhesives used are required to High durability such as peeling or floating occurs. [0003] In addition, under such severe use environment, due to the internal stress generated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J175/04C09J133/14C09J11/06C09J7/02G02B5/30C09J7/22C09J7/38
CPCC09J2433/00C09J7/0246C09J175/04C09J7/0217C08G18/6229G02B5/3033C09J133/08C08G18/8022C09J2203/318C09J7/38C09J7/385C09J7/22C08L2666/20C09J7/30C09J133/04G02B5/3025G02B5/305C09J2301/302
Inventor 目黑晃
Owner SOKEN CHEM & ENG CO LTD
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