POLARIZER PROTECTIVE FILM, POLARIZING PLATE, AND IMAGE DISPLAY APPARATUS

• US 20090067047A1
• Filed: 02/27/2007
• Published: 03/12/2009
• Est. Priority Date: 03/10/2006
• Status: Active Grant

• Current Assignee: Nippon Shokubai Company Limited, Nitto Denko Corporation
• Original Assignee: Nippon Shokubai Company Limited, Nitto Denko Corporation
• Inventors: Ueda, Ken-ichi, Nakano, Yuuki, Otome, Shigeo, Nakata, Mie
• Granted Patent: US 9,297,932 B2
• Time in Patent Office: Days
• US Class Current: 359/485
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: G02B 1/10 Optical coatings produced by application to, or surface treatment of, optical elements G02B1/08 takes precedence
• CPC Class Codes: G02B 1/105 Protective coatings
• CPC Class Codes: G02B 1/14 Protective coatings, e.g. hard coatings
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid

Abstract

Provided is a polarizer protective film, which has high heat resistance, high transparency, high optical characteristics, and high mechanical strength, and is excellent in adhesion with respect to a polarizer. Further, provided are a polarizing plate using such a polarizer protective film and a polarizer, which has high adhesion with respect to the polarizer protective film and the polarizer and is excellent in optical characteristics, and an image display apparatus of high quality using such a polarizing plate.

A polarizer protective film according to the present invention includes a (meth)acrylic resin having a lactone ring structure and core-shell type nanoparticles having a core layer made of a rubber polymer and a shell layer made of a glass polymer.

Claims

1. A polarizer protective film, comprising:

a (meth)acrylic resin having a lactone ring structure; and

core-shell type nanoparticles having a core layer made of a rubber polymer and a shell layer made of a glass polymer.

2. A polarizer protective film according to claim 1, comprising 1 to 40 parts by weight of the core-shell type nanoparticles with respect to 100 parts by weight of the (meth)acrylic resin having a lactone ring structure.

3. A polarizer protective film according to claim 1, wherein the core-shell type nanoparticles have a particle diameter of 1 to 1,000 nm.

4. A polarizing plate, comprising a polarizer formed of a polyvinyl alcohol-based resin and the polarizer protective film according to claim 1.

5. The polarizing plate according to claim 4, comprising an easy adhesion layer and an adhesive layer between the polarizer protective film and the polarizer.

6. A polarizing plate according to claim 5, wherein the adhesive layer is formed of a polyvinyl alcohol-based adhesive.

7. A polarizing plate according to claim 4, comprising a cellulose-based resin film on a side of the polarizer opposite to the polarizer protective film.

8. A polarizing plate according to claim 4, further comprising a pressure-sensitive adhesive layer as at least one of an outermost layer.

9. An image display apparatus comprising at least one polarizing plate according to claim 4.