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

A technology of optical films and adhesives, applied in the direction of film/sheet adhesives, adhesive types, non-polymer adhesive additives, etc., can solve the problems of inability to reduce microgels, etc., and achieve re-peeling Excellent durability, well-balanced durability, smoothness reduction effect

Active Publication Date: 2013-08-21
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesive layers described in these documents cannot reduce the generation of microgels

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0231] The following examples illustrate the present invention, but the present invention is not limited by these examples. It should be noted that the parts and % in each example are based on weight. The room temperature storage conditions not specified below are all 23°C and 65%RH.

[0232] [Measurement of weight-average molecular weight of (meth)acrylic polymer]

[0233] The weight average molecular weight and dispersion ratio (weight average molecular weight / number average molecular weight) of the (meth)acrylic polymer are measured by GPC (Gel Permeation Chromatography).

[0234] ・Analyzer: HLC-8120GPC manufactured by TOSOH CORPORATION

[0235] ・Column: G7000H manufactured by TOSOH CORPORATION XL +GMH XL +GMH XL

[0236] · Column size: each Total 90cm

[0237] ·Column temperature: 40℃

[0238] ·Flow: 0.8ml / min

[0239] ·Injection volume: 100μl

[0240] ·Eluent: tetrahydrofuran

[0241] Detector: Differential refractometer (RI)

[0242] ·Standard sample: polys...

manufacture example 1

[0246]

[0247]85.8% by weight of butyl acrylate, 13.2% by weight of benzyl acrylate, 1 part of 4-hydroxybutyl acrylate, 0.1 part of 2,2'-azobisisobutyronitrile as a polymerization initiator, and 100 parts of ethyl acetate Put them together into a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction pipe, and a condenser, and introduce nitrogen gas while stirring slowly to perform nitrogen replacement. Then, keep the liquid temperature in the flask at around 55°C and perform polymerization for 8 hours. The reaction prepared a solution of an acrylic polymer (A) having a weight average molecular weight (Mw) of 750,000 and (weight average molecular weight (Mw)) / (number average molecular weight (Mn))=4.1.

manufacture example 2～10

[0249] In Production Example 1, the type or ratio of the monomers forming the acrylic polymer and the molecular weight of the acrylic polymer were changed as shown in Table 1, and the acrylic polymer was prepared in the same manner as in Production Example 1. (B) ~ (J) solution.

[0250] [Table 1]

[0251]

[0252] in FIG. 1,

[0253] BA: butyl acrylate, BzA: benzyl acrylate, HBA: 4-hydroxybutyl acrylate, HEA: 2-hydroxyethyl acrylate, AA: acrylic acid.

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Abstract

The adhesive composition for optical films containing a (meth)acrylic polymer of 300,000-1,200,000 weight average molecular weight on gel permeation chromatography obtained by copolymerizing as monomer units 30-98.9 weight % of alkyl (meth)acrylate, 1-50 weight % of polymerizable aromatic ring-containing monomer, and 0.1-20 weight % of hydroxyl group-containing monomer, is characterized in that the (meth)acrylic polymer does not contain carboxyl group-containing monomers as monomer units, the content of solids is 20 weight % or more, and the solvent content is 80 weight % or less.

Description

technical field [0001] The present invention relates to an adhesive composition for an optical film having excellent removability (reworkability) and excellent durability in a bonded state, and an adhesive composition formed on at least one surface of an optical film using the adhesive composition. Adhesive optical film with agent layer. Furthermore, the present invention relates to image display devices such as liquid crystal display devices, organic EL display devices, CRTs, and PDPs, and components commonly used with image display devices, such as front panels, using the adhesive optical film. As the aforementioned optical film, surface treatment films such as polarizing plates, retardation films, optical compensation films, brightness enhancement films, and antireflection films, and films laminated with these can be used. Background technique [0002] For liquid crystal display devices and organic EL display devices, due to their image forming methods, for example, in l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J133/14C09J7/02C09J11/06C09J175/04G02B5/30
CPCC09J133/066C09J2203/318C09J133/08G02F2202/28C08G18/6229C08G18/8029C09J175/04C08G2170/40G02B5/30G02B1/14G02B1/16C09J7/385Y10T428/2891Y10T428/269G02F1/13332C08F220/1804C08F220/1807C08F220/20C08F220/06C09J7/22C09J11/06C09J133/14G02B5/3025G02B5/305G02F1/133509H10K30/865G02B1/04
Inventor 外山雄祐保井淳木村智之佐竹正之后藤周作喜多川丈治宫武稔森智博上条卓史
Owner NITTO DENKO CORP
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