Adhesive composition for polarizing plate, polarizing plate including the same and optical display including the same

Patent metadata

Field	Value
Publication number	US-2016177145-A1
Application number	US-201514971441-A
Country	US
Kind code	A1
Filing date	Dec 16, 2015
Priority date	Dec 19, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

An adhesive composition for polarizing plates, a polarizing plate, and an optical display, the composition including a tertiary amine group-containing (meth)acrylic copolymer; a cellulose resin; an isocyanate compound; and a metal chelate compound.

First claim

What is claimed is:

1 . An adhesive composition for polarizing plates, the composition comprising:
a tertiary amine group-containing (meth)acrylic copolymer; a cellulose resin; an isocyanate compound; and a metal chelate compound.

2 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the adhesive composition has a gel fraction of about 50% or more after 12-hour aging, as calculated according to the following equation:
Gel fraction=( WC−WA )/( WB−WA )×100,
wherein WA is a weight of a wire mesh; WB is a total weight of the wire mesh and a specimen of an adhesive film for polarizing plates, which is obtained by depositing 1.0 g of an adhesive composition for polarizing plates to a thickness of 20 μm on a release film, followed by aging the adhesive composition for polarizing plates on the release film at 23° C. and 55% RH for 12 hours, and then is placed on the wire mesh; and WC is a total weight of the wire mesh and the adhesive film, which are placed in a sample bottle, left for 1 day after adding 50 cc of ethyl acetate to the sample bottle, and then dried at 90° C. for 24 hours.

3 . The adhesive composition for polarizing plates as claimed in claim 2 , wherein the adhesive composition has an absolute value of a difference between a gel fraction after 12-hour aging and a gel fraction after 48-hour aging of about 5% or less.

4 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the composition includes:
100 parts by weight of the tertiary amine group-containing (meth)acrylic copolymer; about 3 parts by weight to about 10 parts by weight of the cellulose resin; about 0.05 parts by weight to about 5 parts by weight of the isocyanate compound; and about 0.01 parts by weight to about 10 parts by weight of the metal chelate compound.

5 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the tertiary amine group-containing (meth)acrylic copolymer includes about 0.01 wt % to about 5 wt % of (meth)acrylic repeat units having a tertiary amine group, based on a total weight of repeat units in the copolymer.

6 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the tertiary amine group-containing (meth)acrylic copolymer is prepared by copolymerization of a monomer mixture, the monomer mixture including:
a hydroxyl group-containing (meth)acrylic monomer, a tertiary amine group-containing (meth)acrylic monomer, and a monomer having a glass transition temperature Tg of about 100° C. or higher.

7 . The adhesive composition for polarizing plates as claimed in claim 6 , wherein the monomer mixture further includes an alkyl group-containing (meth)acrylic monomer.

8 . The adhesive composition for polarizing plates as claimed in claim 6 , wherein the tertiary amine group-containing (meth)acrylic monomer includes N,N-(dimethylamino)ethyl (meth)acrylate or N,N-(diethylamino)ethyl (meth)acrylate.

9 . The adhesive composition for polarizing plates as claimed in claim 6 , wherein the monomer having a glass transition temperature Tg of about 100° C. or more includes (meth)acryloyl morpholine, N-vinylpyrrolidone, or isobornyl (meth)acrylate.

10 . The adhesive composition for polarizing plates as claimed in claim 7 , wherein the monomer mixture includes:
about 0.1 wt % to about 20 wt % of the hydroxyl group-containing (meth)acrylic monomer, about 0.01 wt % to about 5 wt % of the tertiary amine group-containing (meth)acrylic monomer, about 1 wt % to about 30 wt % of the monomer having a glass transition temperature Tg of about 100° C. or more, and about 60 wt % to about 95 wt % of the alkyl group-containing (meth)acrylic monomer.

11 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the tertiary amine group-containing (meth)acrylic copolymer has a glass transition temperature of about −45° C. to about −30° C.

12 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the cellulose resin is cellulose acetate butyrate.

13 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the cellulose resin includes about 1 wt % to about 10 wt % of a hydroxyl group, based on a total weight of the cellulose resin.

14 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein the metal chelate compound is a tin-based chelate compound or an aluminum-based chelate compound.

15 . The adhesive composition for polarizing plates as claimed in claim 1 , wherein a weight ratio of the isocyanate compound to the metal chelate compound is 1:0.05 to 1:5.

16 . The adhesive composition for polarizing plates as claimed in claim 1 , further comprising a silane coupling agent or a reworking agent.

17 . The adhesive composition for polarizing plates as claimed in claim 16 , wherein:
the composition includes the silane coupling agent, and the silane coupling agent includes an acetoacetyl group-containing silane coupling agent.

18 . A polarizing plate comprising an adhesive film for polarizing plates, the adhesive film being formed of the adhesive composition for polarizing plates as claimed in claim 1 .

19 . An optical display comprising the polarizing plate as claimed in claim 18 .

Assignees

• Samsung Sdi Co Ltd

Inventors

• Nam Irina
• Kim Young Jong
• Kim Il Jin

Classifications

• C09J2401/00

  Presence of cellulose · CPC title

• C08F220/18

  with acrylic or methacrylic acids · CPC title

• C09J7/22

  Plastics; Metallised plastics · CPC title

• C09J133/14 Primary

  of esters containing halogen, nitrogen, sulfur or oxygen atoms in addition to the carboxy oxygen · CPC title

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title