Polarizing plate and image display device comprising same

Patent metadata

Field	Value
Publication number	US-9442223-B2
Application number	US-201414765785-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Sep 30, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

The present invention relates to a polarizing plate including a polarizer; and a protective layer formed on at least one surface of the polarizer, in which the protective layer is a cured product of a radical curable composition including (A) a first compound represented by [Formula 1], (B) a radical curable second compound having two or more of each of a benzene ring, a (meth)acryloyl group, and a carboxy group in a molecule thereof, and (C) a radical initiator, and an image display device including the same.

First claim

The invention claimed is:

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 a cured product of a radical curable composition comprising (A) a first compound represented by Formula I, (B) a radical curable second compound having two or more of each of a benzene ring, a (meth)acryloyl group, and a carboxyl group in a molecule thereof, and (C) a radical initiator:

wherein R 1 is an ester group or an ether group; R 2 is a C 1˜10 alkyl group, a C 4˜10 cycloalkyl group, or a combination thereof, and in this case, R 2 has at least one hydroxy substituent in a molecule thereof; and R 3 is hydrogen, or a substituted or unsubstituted C 1˜10 alkyl group.

2. The polarizing plate of claim 1 , wherein the second compound is a compound represented by Formula II:

wherein R 4 and R 5 are each independently a C 1˜10 aliphatic chain, a C 4˜14 aliphatic ring, a C 6-14 aromatic ring, or a combination thereof; R 6 and R 7 are each independently a C 1˜14 alkyl group, a C 4˜14 cycloalkyl group, a C 6˜14 aryl group, or a combination thereof, and in this case, R 6 and R 7 each independently has at least one carboxyl substituent in a molecule thereof; R 8 and R 9 are each independently an acryloyl group or a methacryloyl group; R 10 is a single bond, or a C 1˜10 alkylene group; R 11 and R 12 are each independently a halogen atom, or a C 1˜10 alkyl group; a and b are each independently an integer of 0 to 2; X 1 and X 2 are each independently a single bond, or —O—; X 3 and X 4 are each independently a single bond, —O—, —CO—, —COO—, or —OCO—; and X 5 and X 6 are each independently a single bond or —O—.

3. The polarizing plate of claim 1 , wherein the radical curable composition comprises 10 to 80 parts by weight of the first compound, 1 to 80 parts by weight of the second compound and 0.5 to 10 parts by weight of the radical initiator, based on 100 parts by weight of the radical curable composition.

4. The polarizing plate of claim 1 , wherein the first compound is one or more selected from the group consisting of compounds represented by Formula 1 to Formula 10:

5. The polarizing plate of claim 1 , wherein the second compound is one or more selected from the group consisting of compounds represented by the Formula 11 and Formula 12:

6. The polarizing plate of claim 1 , wherein the second compound has an acid value of 50 to 300 mg KOH/g.

7. The polarizing plate of claim 1 , wherein the radical curable composition further comprises a photoacid generator.

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

9. The polarizing plate of claim 1 , wherein the protective layer has a thickness of 0.5 to 20 μm.

10. The polarizing plate of claim 1 , wherein a protective film is attached to a surface opposite to a surface of the polarizer, on which the protective layer is formed, through an adhesive layer.

11. The polarizing plate of claim 1 , further comprising:
an adhesion layer at an upper portion of the protective layer.

12. The polarizing plate of claim 1 , wherein the polarizer is a polyvinyl alcohol-based film comprising iodine or a dichroic dye.

13. An image display device comprising the polarizing plate of claim 1 .

14. An image display device comprising the polarizing plate of claim 2 .

15. An image display device comprising the polarizing plate of claim 3 .

16. An image display device comprising the polarizing plate of claim 4 .

17. An image display device comprising the polarizing plate of claim 5 .

18. An image display device comprising the polarizing plate of claim 6 .

19. An image display device comprising the polarizing plate of claim 7 .

20. An image display device comprising the polarizing plate of claim 8 .

Assignees

• Lg Chemical Ltd

Inventors

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

Classifications

• G02B1/14 Primary

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

• G02B5/3033

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

• G02B5/30 Primary

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

• G02F1/1335

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

• Y10T428/105

  Cross-Sectional Technologies · mapped topic