Title:
OPTICAL ADHESIVE AGENT AND ADHESIVE SHEET
Document Type and Number:
WIPO Patent Application WO/2023/136131
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing an adhesive sheet and an adhesive agent having outstanding adhesive strength, heat resistance, resistance to humidity-induced whitening, outgas resistance, and light resistance. Said problem is solved by an optical adhesive agent including an acrylic copolymer (A) and a curing agent (B). The acrylic copolymer (A) is a copolymer of a monomer mixture in which the content of an alkyl (meth)acrylate ester monomer (a1) having a C1-2 alkyl group is 20-60 mass%, the content of an alkyl (meth)acrylate ester monomer (a2) having a C4-8 alkyl group is 30-70 mass%, and the content of ethylene unsaturated monomers (a3) having a hydroxyl group is 2.6-15 mass% in 100 mass% of the monomer mixture. The monomer mixture includes at least two varieties of ethylene unsaturated monomers (a3) having a hydroxyl group, and the ratio G'2/G/1 of the storage modulus G'1 thereof at 175°C to the storage modulus G'2 thereof at 225°C is 0.4-1.4.
Inventors:
SATO SATORU (JP)
Application Number:
PCT/JP2022/048104
Publication Date:
July 20, 2023
Filing Date:
December 27, 2022
Export Citation:
Assignee:
TOYO INK SC HOLDINGS CO LTD (JP)
TOYOCHEM CO LTD (JP)
TOYOCHEM CO LTD (JP)
International Classes:
C08F222/12; C09J133/06; C08F222/26; C08G18/65; C08K5/29; C08L33/08; C09J7/38; C09J11/06; C09J175/04
Foreign References:
| JP2011099078A | 2011-05-19 | |||
| JP2021188016A | 2021-12-13 | |||
| JP2021063204A | 2021-04-22 | |||
| JP2009126929A | 2009-06-11 | |||
| JP2017095660A | 2017-06-01 | |||
| JP2017095655A | 2017-06-01 | |||
| KR20170051620A | 2017-05-12 |
Attorney, Agent or Firm:
IEIRI Takeshi (JP)
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