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Adhesive composition and optical film

A technology of adhesive and composition, which is applied in the field of optical films, can solve the problems of poor repositionability, oozing pollution, and no record of repositionability, etc., and achieve the effects of excellent durability, suppression of leakage, and easy repositioning

Active Publication Date: 2013-05-08
NIPPON CARBIDE KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Japanese Patent Laying-Open No. 10-279907 discloses a combination of a high-molecular-weight acrylic copolymer and a low-molecular-weight acrylic copolymer with a weight-average molecular weight of 30,000 or less. Although there are descriptions of durability and leakage, there is no description Repostability, it can fully predict that the adherend will be polluted by exudation of low molecular weight copolymer components, and the repostability is poor
[0007] In addition, Japanese Patent Application Laid-Open No. 2006-235568 discloses an adhesive that has excellent durability even under high temperature and high humidity by using an active energy ray-curable adhesive composition, and is less prone to leakage. But there is no record about repostability
The inventors of the present invention conducted additional tests on the examples described in the above-mentioned laid-open patent publication. Although the obtained adhesive was excellent in durability and leakage, the adhesion after 24 hours at 50°C, which was an index of repositionability, was not satisfactory. High strength, poor repositioning

Method used

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  • Adhesive composition and optical film
  • Adhesive composition and optical film
  • Adhesive composition and optical film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0100] Examples and comparative examples are described below. In addition, preparation of test pieces used in Examples and Comparative Examples, various test methods, and evaluation methods are as follows.

[0101] (1) Preparation of optical film for test

[0102] As an example of an optical film, a polarizing film having an adhesive layer is produced using a polarizing film. Apply the adhesive composition to a release film surface-treated with a silicone-based release agent so that the coating weight 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, an adhesive layer was attached to the back surface of the polarizing base film (a material in which triacetate cellulose (TAC) films were laminated on both sides of a polarizing plate mainly composed of polyvinyl alcohol (PVA) films, approximately 190 μm) The surface is pressed by pressurized nip rollers. After lamination,...

manufacture example 1

[0132] In the reactor equipped with thermometer, stirrer, nitrogen inlet pipe and reflux cooling pipe, add 96.2 parts by weight of n-butyl acrylate (BA), 0.6 parts by weight of acrylic acid (AA), 3.2 parts by weight of 2-hydroxyethyl acrylate (2HEA) 100 parts by weight of ethyl acetate (EAc) and 0.2 parts by weight of azobisisobutyronitrile (AIBN), the air in the reaction vessel was replaced with nitrogen. Then, under stirring and in a nitrogen atmosphere, the temperature of the contents in the reaction vessel was raised to 65° C., reacted for 6 hours, and then raised to 70° C. for 2 hours. Then, the solution which melt|dissolved 0.4 weight part of AIBN in 20 weight part of EAc was dripped over 1 hour, and it was made to react for 2 more hours. After completion of the reaction, the reaction mixture was diluted with toluene to obtain an acrylic copolymer solution having a solid content of 17.7% by weight and a viscosity of 5030 mPa·s. The weight average molecular weight of the...

manufacture example 2

[0134] Polymerization was carried out in the same manner as in Production Example 1 except that the copolymer composition was set to the monomer composition shown in each Production Example in Table 1 instead of the copolymer composition used in Production Example 1. Table 1 shows the copolymer composition, solid content, glass transition temperature (Tg), and weight average molecular weight (Mw) of Production Example 2.

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Abstract

The invention relates to an adhesive composition and an optical film. The invention provides the adhesive for the optical film which can easily repeat to paste under the condition that the optical film is needed to paste and have excellent durability and inhibit white leakage even at high temperature and high humidity environment, and the optical film. The adhesive composition of the invention comprises an acrylic acid copolymer (A), 1-30 weight parts of multi-vinyl monomer (B), 0.01-5 weight parts of crosslinking agent (C) and 0.01-1 weight parts of tri(3-trialkoxy silyl alkyl) isocyanurate (D) corresponding to 100 weight parts of the acrylic acid copolymer (A).

Description

technical field [0001] The present invention relates to an adhesive composition for an optical film used when attaching an optical film such as a polarizing film or a retardation film to an adherend such as a liquid crystal cell, and an optical film having the adhesive. More specifically, the present invention relates to an adhesive for an optical film and an optical film having the adhesive, which can be peeled off when a problem occurs when the optical film is attached to an adherend, and can be peeled off even at high temperature and high temperature. It exhibits excellent durability even under wet conditions, and it is less likely to cause white leakage. Background technique [0002] A liquid crystal display device used in a wide range of fields as a display device generally consists of a liquid crystal cell with a liquid crystal component aligned in a predetermined direction sandwiched between two support substrates such as glass, a polarizing film, a retardation film, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J4/06G02B1/10G02B5/30C09J4/00C09J11/06C09J133/00
CPCY02P20/149Y02P20/141C09J133/08
Inventor 古江直美服部慎也柳原润一中野宏人宫崎英树齐藤雅仁
Owner NIPPON CARBIDE KOGYO KK