Adhesive composition for polarizer and polarizer using same

Patent metadata

Field	Value
Publication number	US-9790402-B2
Application number	US-201314383753-A
Country	US
Kind code	B2
Filing date	Feb 14, 2013
Priority date	Mar 9, 2012
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

Disclosed herein is an adhesive composition for polarizing plates having increased adhesion by preventing curing inhibition due to moisture. The present invention provides an adhesive composition for polarizing plates, comprising: (A) a radical polymerizable monomer; (B) a cationic polymerizable monomer; (C) an unsaturated dicarboxylic acid anhydride; and (D) an initiator.

First claim

The invention claimed is:

1. An adhesive composition for a polarizing plate, the adhesive composition comprising:
(A) 26.1 parts by weight to 79.8 parts by weight of a radical polymerizable monomer;
(B) 20 parts by weight to 60.9 parts by weight of a cationic polymerizable monomer;
(C) 0.2 parts by weight to 13 parts by weight of an unsaturated dicarboxylic acid anhydride; and
(D) 0.5 parts by weight to 10 parts by weight of an initiator, based on 100 parts by total weight of (A), (B) and (C).

2. The adhesive composition according to claim 1 , wherein the (D) initiator includes: (D1) a radical polymerization initiator, (D2) a cationic polymerization initiator, or a mixture thereof.

3. The adhesive composition according to claim 2 , wherein the (D1) radical polymerization initiator is present in an amount of 0.5 parts by weight to 5 parts by weight based on 100 parts by total weight of (A), (B) and (C), and the (D2) cationic polymerization initiator is present in an amount of 0.5 parts by weight to 5 parts by weight based on 100 parts by total weight of (A), (B) and (C).

4. The adhesive composition according to claim 1 , wherein the unsaturated dicarboxylic acid anhydride includes at least one of maleic anhydride and itaconic anhydride.

5. The adhesive composition according to claim 1 , wherein the radical polymerizable monomer is present in an amount of 45 parts by weight to 55 parts by weight, the cationic polymerizable monomer is present in an amount of 55 parts by weight to 45 parts by weight, and the unsaturated dicarboxylic acid anhydride is present in an amount of 0.8 parts by weight to 8 parts by weight.

6. The adhesive composition according to claim 1 , wherein the radical polymerizable monomer includes a monomer having any one of an acryloyl group, a methacryloyl group, a vinyl group, and an allyl group, and the cationic polymerizable monomer includes a monomer having any one of an epoxy group, an oxetane ring, and a vinyl ether group.

7. The adhesive composition according to claim 1 , further comprising: (E) a photosensitizer.

8. The adhesive composition according to claim 7 , wherein the (D) initiator includes (D2) a cationic polymerization initiator, and the (E) photosensitizer is present in an amount of 0.1 to 5 parts by weight based on 100 parts by total weight of (A), (B) and (C).

9. A polarizing plate comprising a protective film and a polarizer attached to each other by the adhesive composition as claimed in claim 1 .

Assignees

• Cheil Ind Inc
• Cheil Ind Inc

Inventors

• Ogawa Hirosh
• Suwa Tatsuhiro

Classifications

• G02B1/14

  Protective coatings, e.g. hard coatings · CPC title

• Y10T428/31515

  As intermediate layer · CPC title

• G02B5/3033

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• G02B5/30

  Polarising elements (light-modulating devices with active elements G02F1/00) · CPC title

• C09J163/00

  Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins · CPC title