Polarizer plate and preparation method thereof

• US 8,603,291 B2
• Filed: 04/08/2011
• Issued: 12/10/2013
• Est. Priority Date: 12/07/2010
• Status: Active Grant

• Current Assignee: BENQ Materials Corporation
• Original Assignee: BENQ Materials Corporation
• Inventors: Tsai, Cheng-Hsin, Lee, Tsung-Han, Chang, Shu-Yi
• Primary Examiner(s): Orlando, Michael N
• Assistant Examiner(s): LEE, DANIEL H.
• Application Number:
  US13/082,398
• Publication Number:
  US 20120141813A1
• Time in Patent Office: 977 Days
• Field of Search: 156/325, 156/242, 156/244.11, 156/277, 156/289, 156/328, 428/520, 428/522
• US Class Current: 156/328
• CPC Class Codes: B32B 2037/243 Coating
• CPC Class Codes: B32B 2038/0076 Curing, vulcanising, cross-linking
• CPC Class Codes: B32B 2307/42 Polarizing, birefringent, filtering
• CPC Class Codes: B32B 2457/202 LCD, i.e. liquid crystal displays
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 37/025 Transfer laminating
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: Y10T 428/31928 Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31935 Ester, halide or nitrile of addition polymer

Abstract

Acrylic resin is used as a protection film of a polyvinyl alcohol polarizer film to compose a polarizer plate, wherein the glass transition temperature of the acrylic resin is higher than 50° C. A preparation method of the polarizer plate is also disclosed.

Claims

1. A preparation method of a polarizer plate, the preparation method comprising:

preparing an acrylic resin solution having solids content of 20 wt % to 50 wt %, wherein an acrylic resin in the acrylic resin solution has a glass transition temperature higher than 50°

C.;

coating the acrylic resin solution on a release substrate to form an acrylic resin protection film; and

laminating the acrylic resin protection film, a polarizer film, and a second protection film to form a polarizer plate, wherein the polarizer film is between the acrylic resin protection film and the second protection film.

2. The preparation method of claim 1, further comprising adding a cross-linking agent into the acrylic resin solution to cross-link the acrylic resin.

3. The preparation method of claim 1, wherein the acrylic resin protection film is formed by coating, extruding, casting, or screen printing on a release substrate.

4. The preparation method of claim 1, wherein a method of laminating the acrylic resin protection film, a polarizer film, and a second protection film is thermolaminating.

5. The preparation method of claim 1, further comprising standing the polarizer plate at 20°

C. to 60°

C. to increase a glass transition temperature of the acrylic resin protection film.

6. The preparation method of claim 1, wherein the polarizer film comprises a stretched polyvinyl alcohol film.

7. The preparation method of claim 1, wherein the second protection film is selected from the group consisting of acrylic resin, triacetate cellulose, cycloolefin polymer, poly(methyl methacrylate), and polyethylene terephthalate.