Photocurable pressure-sensitive adhesive composition, photocurable pressure-sensitive adhesive layer, and photocurable pressure-sensitive adhesive sheet

An adhesive layer, light-curing technology, applied in the direction of adhesive types, non-polymer adhesive additives, adhesive additives, etc., can solve the problem of difficulty in preventing glue leakage, and achieve the maintenance of fluidity and adhesion. Excellent effect with excellent heat resistance

Active Publication Date: 2012-08-22
NITTO DENKO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since it contains low-molecular-weight epoxy resin, etc., it is difficult to prevent bleeding, etc. during temporary bonding

Method used

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  • Photocurable pressure-sensitive adhesive composition, photocurable pressure-sensitive adhesive layer, and photocurable pressure-sensitive adhesive sheet
  • Photocurable pressure-sensitive adhesive composition, photocurable pressure-sensitive adhesive layer, and photocurable pressure-sensitive adhesive sheet
  • Photocurable pressure-sensitive adhesive composition, photocurable pressure-sensitive adhesive layer, and photocurable pressure-sensitive adhesive sheet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0134] (Preparation of Acrylic Polymer)

[0135] 97 parts by weight of n-butyl acrylate, 3 parts by weight of hydroxyethylacrylamide (KONJIN HEAA), and 0.1 parts by weight of 2 , 2'-Azobisisobutyronitrile was put in together with 140 parts by weight of ethyl acetate and 60 parts by weight of toluene, nitrogen gas was introduced while stirring slowly, nitrogen replacement was carried out for 1 hour, and then the liquid temperature in the flask was kept at 55°C The polymerization reaction was carried out for 10 hours to prepare an acrylic polymer solution with a weight average molecular weight of 900,000. The glass transition temperature of the obtained acrylic polymer was 225K.

[0136] (Preparation of graft polymer)

[0137] The obtained acrylic polymer solution was diluted with ethyl acetate so that the solid content was 25%, to prepare a diluted solution (I). In a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube, and a condenser, 10 parts...

Embodiment 2

[0148] (Preparation of Acrylic Polymer)

[0149] An acrylic polymer solution was prepared in the same manner as in Example 1.

[0150] (Preparation of graft polymer)

[0151] The obtained acrylic polymer solution was diluted with ethyl acetate so that the solid content was 25%, to prepare a diluted solution (I). In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen inlet tube, and a condenser, 10 parts of 4-hydroxybutyl glycidyl acrylate, 10 parts of isobornyl acrylate and 400 parts by weight of the diluted solution (I) were added. 0.1 part of benzoyl peroxide, introduce nitrogen gas while slowly stirring, carry out nitrogen replacement for 1 hour, then keep the liquid temperature in the flask at around 60°C for 4 hours, then carry out polymerization reaction at 70°C for 4 hours to obtain the following polymer solution.

[0152] (Formation of Adhesive Adhesive Layer) Adhesive force measurement sample: 2A

[0153] Next, 0.3 parts by weight of a tr...

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Abstract

Provided is a photocurable pressure-sensitive adhesive composition which does not cause squeeze-out under ordinary temperature and pressure conditions and exhibits sufficient initial tack via drying and crosslinking and which is easily curable by light irradiation and can form a curable pressure-sensitive adhesive layer having high peel resistance. Also provided are a photocurable pressure-sensitive adhesive layer and a photocurable pressure-sensitive adhesive sheet. A photocurable pressure-sensitive adhesive composition which comprises both a graft polymer obtained by grafting a chain that contains a monomer bearing a cyclic ether group onto a (meth)acrylic polymer that contains 0.2 to 10wt% of hydroxyalkyl(meth)acrylamide monomer units, and a cationic photopolymerization initiator; a photocurable pressure-sensitive adhesive layer using the same; and a photocurable pressure-sensitive adhesive sheet.

Description

technical field [0001] The present invention relates to a photocurable adhesive composition, a photocurable adhesive layer, and a photocurable adhesive in which such a photocurable adhesive layer is formed on at least one side of a support. adhesive sheet. Background technique [0002] In recent years, optical components used in electronic devices such as liquid crystal display devices, such as polarizing plates and retardation plates, are attached to liquid crystal cells using adhesives. As such an adhesive, an acrylic adhesive is widely used because it is excellent in heat resistance and light resistance. [0003] However, acrylic adhesives do not exhibit high peel resistance like adhesives. [0004] In addition, as an adhesive sheet, a thermosetting adhesive sheet that is cured by heat treatment has been proposed for bonding applications such as electronic devices. Although such thermosetting adhesives are excellent in bonding strength and heat resistance, they have no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J151/00C08F265/06C09J7/02C09J11/06C09J7/38
CPCC08F265/06C09J2451/00C09J151/003C09J7/38Y10T428/2891C08F220/325C08F220/1808C09J7/385C09J7/22C09J7/30C09J11/06C09J151/00C09J2301/40
Inventor 藤田茂诸石裕中野史子井上彻雄
Owner NITTO DENKO CORP
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