Antireflection film containing ultrafine particles, polarizing plate and liquid crystal display device

• US 5,770,306 A
• Filed: 03/06/1996
• Issued: 06/23/1998
• Est. Priority Date: 03/09/1995
• Status: Expired due to Term

• Current Assignee: Dai Nippon Printing Company Limited
• Original Assignee: Dai Nippon Printing Company Limited
• Inventors: Suzuki, Hiroko, Katagiri, Hiroomi, Tsuchiya, Mitsuru, Takematsu, Kiyotaka
• Primary Examiner(s): Schofer, Joseph L.
• Assistant Examiner(s): SAROFIM, NABIL F
• Application Number:
  US08/611,661
• Time in Patent Office: 839 Days
• Field of Search: 428/328
• US Class Current: 428/328
• CPC Class Codes: B32B 2307/40 having particular optical properties light or UV resistant B32B2307/71
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2310/0881 using ion-radiation, e.g. alpha-rays
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/20 using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C09K 2323/031 Polarizer or dye
• CPC Class Codes: G02B 1/111 using layers comprising organic materials
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof

Abstract

An antireflection film, containing ultrafine particles, formed of a resin composition having excellent dispersibility of ultrafine particles in a binder resin and capable of preventing whitening, a polarizing plate, and a liquid crystal display device are provided.

At least one resin layer is provided on a transparent substrate film directly or through other layer(s), and at least one of the resin layer has a controlled refractive index and is formed of a resin composition containing ultrafine particles. The outermost layer has a lower refractive index than an underlying layer in direct contact therewith. The resin composition contains a carboxyl-containing (meth)acrylate as part or the whole of a binder resin component. A polyfunctional acrylate having in its molecule three or more acryloyl groups may be added to the binder resin component in order to further enhance the properties of the hard coating.

Claims

1. An antireflection film comprising:

a transparent substrate film; and

at least one resin layer provided on said transparent substrate film directly or through (an)other layer(s), said at least one resin layer having a controlled refractive index and formed of a resin composition containing ultrafine particles, the outermost layer having a lower refractive index than the underlying layer in direct contact therewith and disposed on either the transparent substrate film or the transparent substrate film side,

the resin composition containing as at least part of a binder resin component a carboxyl-containing (meth)acrylate prepared by reacting a compound having at least one acid anhydride in its molecule with an hydroxyl-containing polyfunctional acrylate having an hydroxyl group and at least three acryloyl groups in its molecule.

2. The antireflection film according to claim 1, wherein the resin composition contains a polyfunctional acrylate having in its molecule three or more acryloyl groups as part of the binder resin component.

3. The antireflection film according to claim 1, wherein the resin composition contains epoxy acrylate as part of the binder resin component.

4. The antireflection film according to claim 1, wherein the resin composition contains at least one compound selected from aromatic compounds and halogen compounds other than F compounds.

5. The antireflection film according to claim 1, wherein the resin composition is an ionizing radiation curing resin composition.

6. The antireflection film according to claim 1, wherein the resin layer having a controlled refractive index has a higher refractive index than the underlying layer in direct contact therewith.

7. The antireflection film according to claim 1, wherein the resin layer having a controlled refractive index has a lower refractive index than the underlying layer in direct contact therewith.