Polarizing plate and display apparatus comprising same

Patent metadata

Field	Value
Publication number	US-9952362-B2
Application number	US-201515507593-A
Country	US
Kind code	B2
Filing date	Sep 25, 2015
Priority date	Sep 30, 2014
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

The present specification relates to a polarizing plate and a display device comprising the same.

First claim

The invention claimed is:

1. A polarizing plate comprising:
a polarizer;
an adhesive layer formed on at least one surface of the polarizer; and
a protective film formed on the adhesive layer,
wherein the adhesive layer is a cured product of a radical curable adhesive composition comprising:
(A) a first compound represented by the following Formula 1;
(B) a second compound represented by the following Formula B; and
(C) a radical initiator:

in Formula 1,
R101 is an ester group; or an ether group,
R102 is a C 1 to C 10 alkyl group having at least one hydroxy group (—OH); or a C 4 to C 10 cycloalkyl group having at least one hydroxy group (—OH),
R103 is hydrogen; or a C 1 to C 10 alkyl group,

in Formula B,
at least one of R1 and R2 is hydrogen, and the other is a C 1 to C 10 alkyl group,
L1 is —N(H)C(═O)N(H)—; or —N(H)C(═O)-L4-C(═O)N(H)—,
L2 to L4 are the same as or different from each other, and are each independently a C 1 to C 10 alkylene group, which is unsubstituted or substituted with an alkyl group,
when L2 and L3 are the same as or different from each other, and are each independently an unsubstituted C 1 to C 10 alkylene group, one of R1 and R2 is a C 1 to C 10 alkyl group,
m and n are each 1 or 2, and
when m and n are each 2, two structures in the parenthesis are the same as or different from each other.

2. The polarizing plate of claim 1 , wherein the first compound is represented by any one of the following Formula 2 to Formula 9:

3. The polarizing plate of claim 1 , wherein the second compound is obtained by reacting an aziridine compound; and (meth)acrylic acid or a (meth)acrylate including a hydroxy group (—OH) as a substituent.

4. The polarizing plate of claim 3 , wherein the aziridine compound is represented by the following Formula 10 or 11:

in Formulae 10 and 11,
R3 to R11 are the same as or different from each other, and are each independently hydrogen; or a C 1 to C 10 alkyl group,
L12 and L14 are the same as or different from each other, and are each independently a C 1 to C 10 alkylene group, which is unsubstituted or substituted with an alkyl group,
m1 is 1 or 2, and
when m1 is 2, two L12s are the same as or different from each other.

5. The polarizing plate of claim 3 , wherein the (meth)acrylate comprising a hydroxy group as a substituent is represented by the following Formula 12:

in Formula 12,
R12 is hydrogen; or a C 1 to C 10 alkyl group, and
R13 is a C 1 to C 10 alkyl group, which is substituted with at least one hydroxy group (—OH); or a C 3 to 10 cycloalkyl group, which is substituted with at least one hydroxy group (—OH).

6. The polarizing plate of claim 1 , wherein the second compound is represented by the following Formula B-1 or B-2:

in Formulae B-1 and B-2,
the definitions of R1, R2, L2 to L4, m, and n are the same as those of Formula 1.

7. The polarizing plate of claim 1 , wherein the second compound is represented by any one of the following Formulae B-3 to B-5:

8. The polarizing plate of claim 1 , wherein the radical curable adhesive composition includes
40 to 85 parts by weight of the first compound,
5 to 50 parts by weight of the second compound, and
0.1 to 10 parts by weight of the radical initiator, based on 100 parts by weight of the radical curable adhesive composition.

9. The polarizing plate of claim 3 , wherein when the number of aziridine groups of the aziridine compound is defined as n, a molar ratio of the aziridine compound:(meth)acrylic acid or the (meth)acrylate comprising a hydroxy group as a substituent is 1:n, and n is an integer.

10. The polarizing plate of claim 1 , wherein the radical curable adhesive composition further comprises an acrylic monomer comprising an amine group as a third compound.

11. The polarizing plate of claim 10 , wherein the third compound is one or more selected from the group consisting of N,N-dimethyl acrylamide, acryloyl morpholine, N-isopropyl acrylamide, N,N-diethyl acrylamide, N,N-dimethylamino propylacrylamide, and 1,2,2,6,6-pentamethyl-4-piperidiyl methacrylate.

12. The polarizing plate of claim 10 , wherein a content of the third compound is 5 to 20 parts by weight based on 100 parts by weight of the radical curable adhesive composition.

13. The polarizing plate of claim 1 , wherein the radical curable adhesive composition has a glass transition temperature of 60° C. or more after UV curing.

14. The polarizing plate of claim 1 , wherein the radical curable adhesive composition has a storage modulus of 1,000 MPa to 5,000 MPa, which is measured by a dynamic mechanical analysis (DMA) method at 25° C. after curing.

15. A display device comprising:
a display panel; and
the polarizing plate of claim 1 , which is provided on one surface or both surfaces of the display panel.

Assignees

• Lg Chemical Ltd

Inventors

• Lee Mi Rin
• Park Kwang Seung
• Huh Eunsoo
• Park Jun Wuk
• Jeon Sung Hyun

Classifications

• G02F2202/28

  Adhesive materials or arrangements · CPC title

• G02F1/1335

  Structural association of cells with optical devices, e.g. polarisers or reflectors · CPC title

• G02B5/30 Primary

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

• G02F1/133528

  Polarisers · CPC title

• C09J4/00

  Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} · CPC title