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Adhesive composition, adhesive, and adhesive sheet

A composition and adhesive technology, applied in the direction of adhesive types, ester copolymer adhesives, polymer adhesive additives, etc., can solve the difficulty of stress relaxation of the adhesive layer, vitiligo, acrylic adhesives Problems such as low compatibility, to achieve the effect of favorable inventory burden and favorable production efficiency

Active Publication Date: 2013-10-23
LINTEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in order to improve the stress relaxation, the addition amount of the polyurethane elastomer is increased, but the compatibility of the acrylic adhesive and the acrylic adhesive becomes low, and problems such as white spots occur.
Thus, in the prior art, it was difficult to fundamentally improve the stress relaxation properties of the adhesive layer formed of the adhesive composition for optical parts

Method used

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  • Adhesive composition, adhesive, and adhesive sheet
  • Adhesive composition, adhesive, and adhesive sheet
  • Adhesive composition, adhesive, and adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] 1. Preparation of (meth)acrylate polymers

[0135] Into a reaction vessel equipped with a stirrer, a thermometer, a loop cooler, a dropping device, and a nitrogen introduction tube, 95 parts by mass of n-butyl acrylate, 5 parts by mass of acrylic acid, 200 parts by mass of ethyl acetate, and 2,2' - 0.08 mass part of azobisisobutyronitrile was added, and the air in the said reaction container was substituted with nitrogen gas. The temperature of the reaction solution was raised to 60° C. with stirring under this nitrogen atmosphere, and after 16 hours of reaction, it was cooled to room temperature. Here, a part of the obtained solution was subjected to molecular weight measurement by the following method, and the production of a (meth)acrylate polymer (polymer (A)) having a weight average molecular weight (Mw) of 2 million was confirmed.

[0136] 2. Preparation of reactive polyrotaxane compound (B)

[0137] The linear molecule is polyethylene glycol, the cyclic molec...

Embodiment 2－5

[0160] [Example 2-5, Comparative Example 1-2]

[0161] The types and amounts of the monomers constituting the (meth)acrylate polymer, and the blending amounts of the reactive polyrotaxane compound (B) and the photopolymerization initiator (C) are listed in Table 1. In the same manner as in Example 1, a polarizing plate having an adhesive layer was produced.

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Abstract

An adhesive composition, an adhesive, and an adhesive sheet are suitable for optical components such as a polarized sheet and have excellent stress relaxation property. The adhesive composition comprises monomer units which form a polymer, a (methyl) acrylate polymer (A) which has carboxyl-contained monomers and has weight-average molecular weight of being 500,000 to 3 million, and a reactive polyrotaxane compound (B) containing cyclic oligosaccharide having polymerized double bonds.

Description

technical field [0001] The present invention relates to an adhesive composition, an adhesive (material to harden the adhesive composition), and an adhesive sheet, and particularly relates to an adhesive composition, an adhesive, and an adhesive sheet suitable for optical components such as polarizers. Background technique [0002] In general, in a liquid crystal panel, a polarizing plate and a retardation plate are bonded to a glass substrate of a liquid crystal cell or the like, and an adhesive layer formed of an adhesive composition is often used. However, optical members such as polarizers and retardation plates shrink due to heat or the like, and shrinkage due to thermal changes occurs. As a result, the adhesive layer laminated on the optical member cannot follow the shrinkage, and an interface occurs. Peeling (so-called floating, peeling), and deviation of the optical axis of the optical member due to the stress at the time of shrinkage of the optical member, causes a p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/04C09J11/08C09J7/02
CPCC09J7/22C09J7/38C09J7/385C09J11/00C09J133/04C09J2203/318C09J2301/124C09J2301/302G02B5/00G02B5/005
Inventor 小泽祐树又野仁荒井隆行所司悟
Owner LINTEC CORP
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