Adhesive composition for optical use

Patent metadata

Field	Value
Publication number	US-10815406-B2
Application number	US-201715771744-A
Country	US
Kind code	B2
Filing date	Apr 11, 2017
Priority date	Apr 12, 2016
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

Provided is an adhesive composition for optical use, the adhesive composition including: a monofunctional urethane (meth)acrylate-based oligomer; and a polyfunctional urethane (meth)acrylate-based oligomer, in which a weight ratio of the monofunctional urethane (meth)acrylate-based oligomer and the polyfunctional urethane (meth)acrylate-based oligomer is 1:2 to 1:4.

First claim

The invention claimed is:

1. An adhesive composition for optical use, the adhesive composition comprising:
a monofunctional urethane (meth)acrylate-based oligomer; and
a polyfunctional urethane (meth)acrylate-based oligomer,
wherein a weight ratio of the monofunctional urethane (meth)acrylate-based oligomer and the polyfunctional urethane (meth)acrylate-based oligomer is 1:2 to 1:3,
wherein the monofunctional urethane (meth)acrylate-based oligomer has a weight average molecular weight (Mw) of 10,000 g/mol to 20,000 g/mol and
wherein the polyfunctional urethane (meth)acrylate-based oligomer has a weight average molecular weight (Mw) of 30,000 g/mol to 40,000 g/mol.

2. The adhesive composition of claim 1 , wherein the monofunctional urethane (meth)acrylate-based oligomer comprises one or more selected from the group consisting of a polybutadiene urethane (meth)acrylate oligomer, an epoxy urethane (meth)acrylate oligomer, a polyester urethane (meth)acrylate oligomer, and a polyether urethane (meth)acrylate oligomer.

3. The adhesive composition of claim 1 , wherein the polyfunctional urethane (meth)acrylate-based oligomer comprises one or more selected from the group consisting of a polybutadiene urethane (meth)acrylate oligomer, an epoxy urethane (meth)acrylate oligomer, a polyester urethane (meth)acrylate oligomer, and a polyether urethane (meth)acrylate oligomer.

4. The adhesive composition of claim 1 , wherein a total content of the monofunctional urethane (meth)acrylate-based oligomer and the polyfunctional urethane (meth)acrylate-based oligomer is 9 wt % to 30 wt % based on the adhesive composition for optical use.

5. The adhesive composition of claim 1 , wherein the adhesive composition for optical use further comprises a hydroxy group-containing (meth)acrylate-based monomer.

6. The adhesive composition of claim 5 , wherein the hydroxy group-containing (meth)acrylate-based monomer comprises one or more selected from the group consisting of 2-hydroxyethyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 6-hydroxyhexyl (meth)acrylate, 8-hydroxyoctyl (meth)acrylate, 2-hydroxyethylene glycol (meth)acrylate, and 2-hydroxypropylene glycol (meth)acrylate.

7. The adhesive composition of claim 5 , wherein a content of the hydroxy group-containing (meth)acrylate-based monomer is 3 wt % to 8 wt % based on the adhesive composition for optical use.

8. The adhesive composition of claim 1 , wherein the adhesive composition for optical use further comprises one or more selected from the group consisting of an alkyl group-containing (meth)acrylate-based monomer and a cycloalkyl group-containing (meth)acrylate-based monomer.

9. The adhesive composition of claim 8 , wherein the contents of the alkyl group-containing (meth)acrylate-based monomer and the cycloalkyl group-containing (meth)acrylate-based monomer are each 20 wt % to 40 wt % based on the adhesive composition for optical use.

10. The adhesive composition of claim 1 , wherein the adhesive composition for optical use further comprises one or more additives selected from the group consisting of a plasticizer, an adhesive promoter, and a photoinitiator.

11. The adhesive composition of claim 10 , wherein the plasticizer comprises one or more selected from the group consisting of an epoxy-based plasticizer, a fatty acid ester-based plasticizer, a polyester-based plasticizer, a polybutadiene-based plasticizer, and an ether-based plasticizer.

12. The adhesive composition of claim 10 , wherein a content of the plasticizer is 10 wt % to 20 wt % based on the adhesive composition for optical use.

Assignees

• Lg Chemical Ltd

Inventors

• Huh Jin Young
• Yoon Kyung Joon
• Yeon Bo Ra
• Kim Hyun Mee
• Kim Jang Soon

Classifications

• C09J2203/326

  for bonding electronic components such as wafers, chips or semiconductors · CPC title

• C09J175/14 Primary

  Polyurethanes having carbon-to-carbon unsaturated bonds · CPC title

• C09J11/08

  Macromolecular additives · CPC title

• C09J11/06

  organic · CPC title

• C08G18/8175 Primary

  with esters of acrylic or alkylacrylic acid having only one group containing active hydrogen · CPC title