Polarizing plate and liquid crystal display comprising the same

Patent metadata

Field	Value
Publication number	US-9791608-B2
Application number	US-201113580333-A
Country	US
Kind code	B2
Filing date	Feb 28, 2011
Priority date	Feb 26, 2010
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

Abstract

The present invention relates to a polarizing plate and a liquid crystal display device. In the present invention, the polarizing plate is lightweight and has a small thickness and excellent properties including durability, water resistance, workability, pressure-sensitive adhesion and light leakage prevention ability; and the liquid crystal display device including the same are provided.

First claim

The invention claimed is:

1. A polarizing plate, comprising:
a polarizer;
an adhesive layer directly attached to at least one surface of the polarizer; and
an acrylic pressure-sensitive adhesive layer directly attached to the adhesive layer, wherein the acrylic pressure-sensitive adhesive layer includes a first layer and a second layer, and
wherein the first layer is directly adjacent to the adhesive layer and has a tensile modulus at 25° C. of 300 MPa to 850 MPa, and the second layer has a tensile modulus at 25° C. of 0.01 MPa to 1.0 MPa, and
wherein the first layer comprises a cross-linking structure comprising an acryl polymer cross-linked by a multifunctional cross-linking agent and a cross-linking structure comprising a polymerized multifunctional acrylate.

2. The polarizing plate according to claim 1 , wherein the second layer has a pressure-sensitive adhesive surface for attaching the polarizing plate to a liquid crystal panel.

3. The polarizing plate according to claim 1 , wherein the polarizer is a polyvinyl alcohol-based polarizer.

4. The polarizing plate according to claim 1 , wherein the acrylic pressure-sensitive adhesive layer has a thickness of 10 to 80 μm.

5. The polarizing plate according to claim 1 , wherein the adhesive layer includes at least one selected from the group consisting of a polyvinyl alcohol-based adhesive; an acryl-based adhesive; a vinyl acetate-based adhesive; a urethane-based adhesive; a polyester-based adhesive; a polyolefin-based adhesive; a polyvinylalkylether-based adhesive; a rubber-based adhesive; a vinylchloride-vinylacetate-based adhesive; a styrene-butadiene-styrene adhesive; a hydrogenated styrene-butadiene-styrene-based adhesive; an ethylene-based adhesive; and an acrylic acid ester-based adhesive.

6. The polarizing plate according to claim 1 , wherein the adhesive layer includes a thermocurable adhesive composition, a room temperature curable adhesive composition, a moisture curable adhesive composition, or a photocurable adhesive composition in a cured state.

7. The polarizing plate according to claim 1 , further comprising:
a protective film attached to the surface to which the acrylic pressure-sensitive adhesive layer of the polarizer is not attached.

8. The polarizing plate according to claim 1 , wherein the second layer has a tensile modulus at 25° C. of 0.03 to 0.7 MPa.

9. The polarizing plate according to claim 1 , wherein the polymerized multifunctional acrylate is present in an amount of 20 to 200 parts by weight with respect to 100 parts by weight of the acryl polymer.

10. A liquid crystal display device, comprising:
a liquid crystal panel; and
a polarizing plate according to claim 1 attached to one or both surfaces of the liquid crystal panel.

11. The device according to claim 10 , wherein the liquid crystal panel is a passive matrix panel, an active matrix panel, an in-plane switching panel or a vertical alignment panel.

Assignees

• Hwang In Ho
• Kwon Ki Ok
• Kim No Ma
• Nam Sung Hyun
• Park In Kyu
• Yoon Sung Soo
• Rah Kyun Il
• Lee Min Ki
• Lg Chemical Ltd

Inventors

• Hwang In Ho
• Kwon Ki Ok
• Kim No Ma
• Nam Sung Hyun
• Park In Kyu
• Yoon Sung Soo
• Rah Kyun Il
• Lee Min Ki

Classifications

• Y10T428/1077

  Cross-Sectional Technologies · mapped topic

• G02F2201/54

  Arrangements for reducing warping-twist · CPC title

• B32B2457/202

  LCD, i.e. liquid crystal displays · CPC title

• C09J2201/606

  Chemistry & Metallurgy · mapped topic

• G02F2202/28

  Adhesive materials or arrangements · CPC title