Polarizing plate

Patent metadata

Field	Value
Publication number	US-2016238745-A1
Application number	US-201414385726-A
Country	US
Kind code	A1
Filing date	Jun 13, 2014
Priority date	Sep 30, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

The present disclosure relates to a polarizing plate excellent durability even under high humidity conditions and more particularly, to a polarizing plate including a polarizer and a protective layer formed on at least one surface of the polarizer, wherein the protective layer is formed of a cured product of a radically curable composition including a compound represented by the following [Chemical Formula 1]; a vinyl ether compound; a carboxylic acid compound including at least one unsaturated double bond; and a radical initiator.

First claim

What is claimed:

1 . A polarizing plate comprising: a polarizer and a protective layer formed on at least one surface of the polarizer,
wherein the protective layer is formed of a cured product of a radically curable composition including a compound represented by the following [Chemical Formula 1]; a vinyl ether compound; a carboxylic acid compound including at least one unsaturated double bond; and a radical initiator,

where R 1 is an ester group or an ether group,
R 2 is a C 1-10 alkyl group having at least one hydroxy substituent or a C 4-10 cycloalkyl group having at least one hydroxy substituent, and
R 3 is hydrogen or a C 1-10 alkyl group.

2 . The polarizing plate of claim 1 , wherein the radically curable composition includes:
40 to 90 parts by weight of the compound represented by the [Chemical Formula 1]; 1 to 50 parts by weight of the vinyl ether compound; 1 to 50 parts by weight of the carboxylic acid compound including at least one unsaturated double bond; and 0.5 to 10 parts by weight of the radical initiator, based on 100 parts by weight of the total composition.

3 . The polarizing plate of claim 1 , wherein the compound represented by the [Chemical Formula 1] is at least one selected from among compounds represented by the following [Chemical Formula 2] to [Chemical Formula 9].

4 . The polarizing plate of claim 1 , wherein the vinyl ether compound is at least one selected from a group consisting of ethylene glycol monovinyl ether, 1,4-buthanol vinyl ether, di(ethylene glycol) divinyl ether, tri(ethylene glycol) divinyl ether, tert-butyl vinyl ether, 1-(vinyloxy)-2,2-bis((vinyloxy)methyl)butane, 1,3-bis(vinyloxy)-2,2-bis((vinyloxy)methyl)propane and cyclohexyl vinylether.

5 . The polarizing plate of claim 1 , wherein the carboxylic acid compound including at least one unsaturated double bond is at least one selected from a group consisting of a maleic acid, a fumaric acid, an angelic acid and a tiglic acid.

6 . The polarizing plate of claim 1 , wherein the radically curable composition further includes: a compound having an acid value of 100 to 1000 mgKOH/g.

7 . The polarizing plate of claim 6 , wherein the compound having an acid value of 100 to 1000 mgKOH/g is included in an amount of 10 to 50 parts by weight, based on 100 parts by weight of the radically curable composition.

8 . The polarizing plate of claim 6 , wherein the compound having an acid value of 100 to 1000 mgKOH/g is at least one selected from a group consisting of compounds represented by the following [Chemical Formula 10] to [Chemical Formula 21]:

9 . The polarizing plate of claim 1 , wherein the radically curable composition further includes: a photoacid generator.

10 . The polarizing plate of claim 1 , wherein a glass transition temperature of the radically curable composition is 60° C. to 500° C.

11 . The polarizing plate of claim 1 , further comprising: a protective film attached to a surface of the polarizer, opposite to the surface thereof on which the protective layer is formed, via an adhesive layer.

12 . The polarizing plate of claim 11 , wherein the protective film is a cellulose film, a polyethylene terephthalate (PET) film, a cycloolefin polymer (COP) film, or an acrylic film.

13 . The polarizing plate of claim 1 , further comprising: a pressure sensitive adhesive (PSA) formed on the protective layer.

14 . A display device comprising: the polarizing plate of claim 1 .

Assignees

• Lg Chemical Ltd

Inventors

• Lee Mi-Rin
• Park Kwang-Seung
• Park Jun-Wuk
• Huh Eun-Soo

Classifications

• G02B1/14

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

• C09D133/14

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

• B32B7/12 Primary

  using interposed adhesives or interposed materials with bonding properties · CPC title

• G02B5/3033 Primary

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

• B32B2255/26

  Polymeric coating · CPC title