Polarizing plate, polarizing plate adhesive composition for same, and optical display apparatus comprising same

Patent metadata

Field	Value
Publication number	US-2021318478-A1
Application number	US-201917272880-A
Country	US
Kind code	A1
Filing date	Dec 20, 2019
Priority date	Dec 24, 2018
Publication date	Oct 14, 2021
Grant date	—

Abstract

Provided are a polarizing plate, a polarizing plate adhesive composition for same, and an optical display apparatus comprising same, the polarizing plate comprising: a polarizer; and a polarizing plate adhesive layer and a protective layer which are sequentially formed on at least one surface of the polarizer, wherein the polarizing plate adhesive layer comprises poly(ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS), and the polarizing plate adhesive layer has a surface resistance of about 1×10 8 to about 1×10 12 (Ω/□).

First claim

1 . A polarizing plate comprising:
a polarizer; and a bonding layer for polarizing plates and a protective layer sequentially formed on at least one surface of the polarizer; wherein the bonding layer for polarizing plates comprises a poly(ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT:PSS), further wherein the bonding layer for polarizing plates has a surface resistance of about 1×10 8 Ω/□ to about 1×10 12 Ω/□.

2 . The polarizing plate according to claim 1 , wherein the bonding layer for polarizing plates has a surface resistance of about 1×10 8 Ω/□ to about 1×10 12 Ω/□ after leaving the polarizing plate under conditions of 85° C. and 85% RH for 250 hours.

3 . The polarizing plate according to claim 1 , wherein the polarizing plate has a surface resistance ratio of greater than about 0 and less than or equal to about 1 according to Equation 1:
surface resistance ratio=SR2/SR1  [Equation 1]
(where SR1 is a surface resistance (unit: Ω/□) of the bonding layer for polarizing plate before leaving the polarizing plate under conditions of 85° C. and 85% RH for 250 hours, and SR2 is a surface resistance (unit: Ω/□) of the bonding layer for polarizing plate after leaving the polarizing plate under conditions of 85° C. and 85% RH for 250 hours).

4 . The polarizing plate according to claim 1 , wherein the bonding layer for polarizing plates comprises poly(ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT:PSS) in an amount of about 1 wt % to about 50 wt %.

5 . The polarizing plate according to claim 1 , wherein the bonding layer for polarizing plates is formed of a bonding composition for polarizing plates comprising poly(ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT:PSS), a polyvinyl alcohol resin and a salt of glyoxylic acid.

6 . The polarizing plate according to claim 5 , wherein the poly(ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT:PSS) is present in an amount of about 5 parts by weight to about 30 parts by weight and the salt of glyoxylic acid is present in an amount of about 1 part by weight to about 50 parts by weight based on 100 parts by weight of the polyvinyl alcohol resin.

7 . The polarizing plate according to claim 5 , wherein the salt of glyoxylic acid includes at least one of lithium glyoxylate, sodium glyoxylate, potassium glyoxylate, magnesium glyoxylate, calcium glyoxylate, strontium glyoxylate, and barium glyoxylate.

8 . A bonding composition for polarizing plates comprising a polyvinyl alcohol resin, a poly(ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT:PSS) and a salt of glyoxylic acid.

9 . The bonding composition for polarizing plates according to claim 8 , wherein the bonding composition comprises about 5 parts by weight to about 30 parts by weight of the poly(ethylenedioxythiophene) poly(styrenesulfonate)(PEDOT:PSS) and about 1 part by weight to about 50 parts by weight of the salt of glyoxylic acid based on 100 parts by weight of the polyvinyl alcohol resin.

10 . The bonding composition for polarizing plates according to claim 8 , wherein the salt of glyoxylic acid includes at least one of lithium glyoxylate, sodium glyoxylate, potassium glyoxylate, magnesium glyoxylate, calcium glyoxylate, strontium glyoxylate, and barium glyoxylate.

11 . The bonding composition for polarizing plates according to claim 8 , wherein the polyvinyl alcohol resin comprises a polyvinyl alcohol resin having a degree of modification by an acetoacetyl group of about 1 mol % to about 30 mol %.

12 . The bonding composition for polarizing plates according to claim 8 , wherein the bonding composition has a surface resistance at 25° C. of about 1×10 8 to about 1×10 12 (Ω/□) measured with a cured specimen obtained by curing the bonding composition for polarizing plate, and has a surface resistance at 25° C. of about 1×10 8 to about 1×10 12 (Ω/□) measured with a specimen obtained by leaving the cured specimen under conditions of 85° C. and 85% RH for 250 hours.

13 . An optical display device comprising the polarizing plate according to claim 1 .

14 . The optical display device according to claim 13 , wherein the optical display device includes an in-cell type liquid crystal panel, a first polarizing plate disposed on a light exit surface of the in-cell type liquid crystal panel, and a second polarizing plate disposed on a light incident surface of the in-cell type liquid crystal panel, wherein the first polarizing plate includes the polarizing plate.

15 . The optical display device according to claim 14 , wherein the in-cell type liquid crystal panel includes a first substrate, a second substrate disposed to face the first substrate, a touch sensor layer and a liquid crystal layer interposed between the first substrate and the second substrate.

Assignees

• Samsung Sdi Co Ltd

Inventors

• Lee Tae Hyun
• Yu Mi Yeon
• Lee Seung Jun
• Jeong Woo Jin
• Kim Il Jin

Classifications

• G02F1/13338

  Input devices, e.g. touch panels · CPC title

• G02F2202/28

  Adhesive materials or arrangements · CPC title

• G02F1/133528

  Polarisers · CPC title

• C08L79/02

  Polyamines · CPC title

• C08L65/00

  Compositions of macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain (C08L7/00 - C08L57/00, C08L61/00 take precedence); Compositions of derivatives of such polymers · CPC title