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Adhesive composition for optical films, adhesive optical film and image display

A technology for optical films and adhesives, applied in the direction of film/sheet adhesives, adhesive types, ester copolymer adhesives, etc., which can solve the problems of insufficient reworkability and workability. , to achieve the effect of inhibiting shedding or contamination, improving reworkability, and improving machinability and reworkability

Active Publication Date: 2009-06-24
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acrylic adhesives described in these patent documents can all improve durability, but cannot sufficiently satisfy reworkability and processability.

Method used

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  • Adhesive composition for optical films, adhesive optical film and image display
  • Adhesive composition for optical films, adhesive optical film and image display
  • Adhesive composition for optical films, adhesive optical film and image display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0156] Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited to these Examples. However, the parts and % in each example are based on weight. Evaluation items in Examples and the like were measured as follows.

[0157]

[0158] The weight average molecular weight of the obtained (meth)acrylic polymer was measured by GPC (gel permeation chromatography). As the sample, a sample was dissolved in dimethylformamide to obtain a 0.1% by weight solution, which was allowed to stand overnight, and then filtered through a 0.45 μm membrane filter.

[0159] ·Analyzing device: Tosoh-manufactured by HLC-8120GPC

[0160] ·Column: Tosoh—manufactured by the company, SuperAWM—H, AW4000, AW2500

[0161] ·Column size: each 6.0mmΦ×150mm

[0162] Eluent: 30mM-lithium bromide, 30mM-phosphoric acid in dimethylformamide

[0163] ·Flow rate: 0.4ml / min

[0164] Detector: Differential Refractometer (RI)

[0165] ·Column temperature: 40℃

[0166] ·...

manufacture example 1

[0170]

[0171]Put 99.1 parts of butyl acrylate, 0.1 part of N,N-dimethylaminoethyl acrylate, 0.3 parts of acrylic acid, and 4-hydroxybutyl acrylate into a four-necked flask equipped with a stirring paddle, a thermometer, a nitrogen inlet tube, and a cooler. 0.5 parts of ester, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 200 parts of ethyl acetate were slowly stirred while nitrogen gas was introduced, and after nitrogen substitution, the liquid temperature in the flask was maintained to The polymerization reaction was carried out at around 60° C. for 6 hours to prepare an acrylic polymer solution. The weight average molecular weight of the acrylic polymer is 2.05 million.

manufacture example 2～25

[0173] In Production Example 1, an acrylic polymer solution was prepared in the same manner as in Production Example 1, except that at least one of the types and amounts of monomer components used and the solvent were changed as shown in Table 1. Table 1 shows the weight average molecular weight of the acrylic polymer obtained in each example.

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Abstract

The present invention provides an optical film pressure-sensitive adhesive composition, pressure-sensitive optical films and an image display device. The invention particularly provide an optical film pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer that has reworkability such that optical films therewith can be easily separated from liquid crystal panels with no adhesive residue and also has satisfactory processability such that it can be processed without causing adhesive stain or dropout after it is formed on an optical film. The optical film pressure-sensitive adhesive composition includes 100 parts by weight of a (meth)acrylic polymer including, as monomer units, (a) 50 to 99.79% by weight of an alkyl (meth)acrylate monomer, (b) 0.01 to 0.45% by weight of a tertiary amino group-containing monomer, and (c) 0.1 to 3% by weight of a hydroxyl group-containing monomer; and 0.01 to 2 parts by weight of a crosslinking agent that is at least one selected from the group consisting of hexamethylene diisocyanate, hydrogenated xylylene diisocyanate, and isophorone diisocyanate, or a polyisocyanate compound derived therefrom.

Description

technical field [0001] The present invention relates to an adhesive composition for an optical film that requires transparency, and an adhesive optical film in which an adhesive layer is formed on at least one surface of the optical film using the adhesive composition. Furthermore, the present invention relates to image display devices such as liquid crystal display devices and organic EL display devices using the pressure-sensitive adhesive optical film. As the above-mentioned optical film, a polarizing plate, a retardation film, an optical compensation film, a brightness improving film, and a film obtained by laminating them can be used. Background technique [0002] In terms of liquid crystal displays, etc., it is necessary and indispensable to arrange polarizing elements on both sides of the liquid crystal cell from the perspective of its image forming method, and usually a polarizing plate is attached. In addition, in addition to using polarizing plates on the liquid c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/06C09J175/04C09J7/00G02B5/30G02F1/1335
CPCC09J9/00C09J11/06C09J133/10C08K5/544G02B5/305G02F1/1306
Inventor 井上真一外山雄祐长田润枝细川敏嗣诸石裕中野史子
Owner NITTO DENKO CORP
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