Adhesive composition

Patent metadata

Field	Value
Publication number	US-2016369135-A1
Application number	US-201615254078-A
Country	US
Kind code	A1
Filing date	Sep 1, 2016
Priority date	Apr 23, 2014
Publication date	Dec 22, 2016
Grant date	—

Abstract

An adhesive composition includes an acryl copolymer having a hydroxyl group and a weight average molecular weight of 800,000 to 1,500,000 g/mol; an isocyanate-based cross-linking agent, an aliphatic hydrocarbon solvent having 6 to 10 carbon atoms, and an acid additive having a molecular weight of 40 to 100 g/mol, thus low viscosity characteristics may be maintained for a long period of time, and thereby stirring and coating may be easily performed while it does not require an excess of diluted solvent.

First claim

What is claimed is:

1 . An adhesive composition comprising:
an acryl copolymer having a hydroxyl group and a weight average molecular weight of 800,000 to 1,500,000 g/mol; an isocyanate-based cross-linking agent; an aliphatic hydrocarbon solvent having 6 to 10 carbon atoms; and an acid additive having a molecular weight of 40 to 100 g/mol.

2 . The adhesive composition according to claim 1 , wherein the acryl copolymer has a weight average molecular weight of 1,000,000 to 1,400,000 g/mol.

3 . The adhesive composition according to claim 1 , wherein the aliphatic hydrocarbon solvent is at least one selected from the group consisting of; 3-methylpentane, normal hexane, 2,4-dimethylpentane, 2,2,3-trimethylbutane, 3,3-dimethylpentane, 2-methylhexane, 2,3-dimethylpentane, 3-methylhexane, normal heptane, cyclohexane, methyl cyclohexane, 2,2-dimethylhexane, 2,3-dimethylhexane, 2,5-dimethylhexane, 2,4-dimethylhexane, 3,3-dimethylhexane, 3,4-dimethylhexane, 2,3,4-trimethylpentane, 2,3,3-trimethylpentane, 2-methyl-3-ethylpentane, 2-methylheptane, 3-methylheptane, 4-methylheptane, 2,2,5-trimethylhexane, normal octane, cyclooctane, nonane, cyclononane, hexane, heptene, octene and nonene.

4 . The adhesive composition according to claim 1 , further comprising at least one solvent selected from the group consisting of an aromatic hydrocarbon solvent having 6 to 18 carbon atoms, an aliphatic carboxylic acid ester solvent having 4 to 20 carbon atoms and a ketone solvent.

5 . The adhesive composition according to claim 3 , wherein the aliphatic hydrocarbon solvent is included in an amount of 20 to 80 wt. % to a total weight of the solvent.

6 . The adhesive composition according to claim 1 , wherein the acid additive is at least one selected from the group consisting of acrylic acid, methacrylic acid, acetic acid, propionic acid, butanoic acid, formic acid, glycolic acid and lactic acid.

7 . The adhesive composition according to claim 1 , wherein the acid additive is included in an amount of 0.5 to 5 wt. parts to 100 wt. parts of the copolymer in terms of solid content.

8 . The adhesive composition according to claim 1 , further comprising a silane coupling agent.

9 . An adhesive sheet comprising an adhesive layer formed of the adhesive composition according to claim 1 .

10 . A polarizing plate comprising an adhesive layer formed of the adhesive composition according to claim 1 on at least one surface of the polarizing plate.

11 . An image display device comprising the polarizing plate according to claim 10 .

Assignees

• Dongwoo Fine Chem Co Ltd

Inventors

• Choi Han Young
• An Myung Young
• Yoo Min Keun

Classifications

• C08F2500/17

  Viscosity · CPC title

• C08F120/16

  of phenols or of alcohols containing two or more carbon atoms · CPC title

• C08F2800/20

  as weight or mass percentages · CPC title

• C09J133/066

  containing -OH groups · CPC title

• C08F2500/03

  Narrow molecular weight distribution, i.e. Mw/Mn < 3 · CPC title