Adhesive composition for optical member, adhesive layer for optical member and its producing method, optical member with adhesive, and image display device

A technology for optical components and adhesive layers, applied in the directions of bonding methods, adhesive types, ester copolymer adhesives, etc., can solve the problems of undisclosed changes over time, achieve low viscosity, improve coating Excellent effect of coating and punching processability

Active Publication Date: 2005-10-19
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, there is no disclosure of an example in which properties are stabilized, changes over time are r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0211] Example

[0212] Hereinafter, Examples and the like which specifically show the configuration and effects of the present invention will be described. Here, the evaluation items in Examples and the like were measured by the methods shown below.

[0213]

[0214] Molecular weights were determined using GPC (gel permeation chromatography).

[0215] Analytical device: Toso One Manufacturing Co., Ltd., HLC-8120GPC

[0216] column:

[0217] Sample column:

[0218] East One System, G7000H XL +GMH XL +GMH XL

[0219] Column size: each 7.8mmΦ×30cm (total 90cm)

[0220] Flow: 0.8ml / min

[0221] Injection sample concentration: about 0.1 wt%

[0222] Injection volume: 100μl

[0223] Column temperature: 40℃

[0224] Eluent: Tetrahydrofuran

[0225] Detector: Differential Refractometer (RI)

[0226] In addition, the molecular weight was calculated|required by polystyrene conversion.

[0227] In addition, the ratio (weight fraction (Area %)) of the component whose wei...

Embodiment I

[0230]

[0231] About 0.1 g of the pressure-sensitive adhesive layer immediately after the cross-linking treatment was taken out, and weighed to obtain the weight (W 1 ). Next, it was wrapped with a microporous tetrafluoroethylene membrane (membrane weight W 2 ), after immersion in about 50 ml of ethyl acetate for 2 days, the soluble components were extracted. It was dried, and the total weight (W 3 ). From these measured values, the gel ratio (% by weight) of the pressure-sensitive adhesive layer can be determined according to the following formula. In addition, the gel ratio after being stored at room temperature for 1 week after application was measured.

[0232] Gel ratio (wt%)=((W 3 -W 2 ) / W 1 )×100

[0233]

[0234] The viscosity evaluation of the prepared binder solution was measured under the following conditions with a rotational viscometer (Toki Sangyo Co., Ltd., model TBV-20H, equipped with a small sampling nozzle).

[0235] Measurement temperature: 24℃...

Embodiment I-1

[0248] (Preparation of acrylic polymer)

[0249] Into a four-necked flask equipped with a nitrogen introduction tube and a condenser tube, 80 parts by weight of butyl acrylate, 20 parts by weight of 2-ethylhexyl acrylate, 5 parts by weight of acrylic acid, 0.08 parts by weight of 2-hydroxyethyl acrylate, and 0.35 parts by weight of benzoyl oxide and 100 parts by weight of ethyl acetate were fully replaced with nitrogen, and then the polymerization reaction was carried out at 56° C. for 10 hours while stirring under a nitrogen stream to obtain weight average molecular weights of 2.2 million and 100,000. The following ratios are 2 wt % solutions of the acrylic polymer (1). The polymerization rate was 70%, and the polymer concentration after polymerization was 36% by weight.

[0250] (dilution of acrylic polymer)

[0251] With respect to 100 parts by weight of polymer solids in the acrylic polymer solution (concentration: 36% by weight), n-heptane (SP value: 15.2 [(J / cm) was ad...

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Abstract

The adhesive composition for optical members contains a (methyl) acrylic polymer containing >=60 wt.% alkyl acrylate having a 1-9C alkyl group as a monomer unit, having a weight-average molecular weight of >=1,500,000 and containing >=20 wt.% component having a molecular weight of <=100,000, and an organic solvent. The composition contains a poor solvent having a solubility parameter [delta]2 satisfying the formula: +1.7<=[Delta][delta](=[delta]1-[delta]2)<=+5 wherein [delta]1 is the solubility parameter of the homopolymer of the monomer constituting the main part of the acrylic polymer. The amount of the poor solvent is 20-60 wt.% of the total organic solvent. The invention provides an adhesive composition having improved coatability and keeping the durability without particularly increasing the amount of solvent in coating, an adhesive layer produced by using the composition and a method for producing the composition.

Description

technical field [0001] The present invention relates to a solvent-based (meth)acrylic pressure-sensitive adhesive composition for optical members. Moreover, this invention also relates to the adhesive layer for optical members which consists of this adhesive composition for optical members, and its manufacturing method. Furthermore, the present invention relates to an adhesive optical member having the adhesive layer, and image display devices such as a liquid crystal display device, an organic EL display device, and a PDP using the above adhesive optical member. As said optical member, a polarizing plate, a retardation plate, an optical compensation film, a brightness improvement film, the member which laminated|stacked these, etc. are mentioned. Background technique [0002] The optical adhesive layer is required to have a high level of uniformity in its thickness or surface, and in order to improve coatability, a method currently adopted is to reduce the concentration du...

Claims

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Application Information

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IPC IPC(8): B32B7/12C09J133/06G02F1/1347
CPCC09J5/00C09J133/064C09J2203/00G02F1/01
Inventor 中野史子诸石裕矢野浩平佐竹正之小笠原晶子白藤文明细川敏嗣
Owner NITTO DENKO CORP
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