Method for producing optical laminate

Patent metadata

Field	Value
Publication number	US-9348074-B2
Application number	US-201214114098-A
Country	US
Kind code	B2
Filing date	Apr 5, 2012
Priority date	Apr 26, 2011
Publication date	May 24, 2016
Grant date	May 24, 2016

Abstract

A method for producing an optical laminate including a film substrate and a polarizing layer which comprises the steps of: (A) laminating a re-releasable film on one main surface of the film substrate to obtain a laminate film substrate; B) performing a rubbing treatment on the other main surface of the film substrate of the laminate film substrate; C) coating the rubbing-treated surface of the film substrate with a solution containing a lyotropic liquid crystal compound and a solvent; and D) detaching the re-releasable film from the laminate film substrate.

First claim

What is claimed is:

1. A method for producing an optical laminate, comprising the steps of:
a preliminary step of preparing a film substrate;
(A) laminating a re-releasable film on one main surface of the film substrate to obtain a laminate film substrate;
(B) conducting a rubbing treatment on the other main surface of the film substrate of the laminate film substrate;
(C) applying a solution containing a lyotropic liquid crystal compound and a solvent onto the rubbing-treated surface of the film substrate; and
(D) releasing the re-releasable film from the laminate film substrate.

2. The method according to claim 1 , wherein a material for forming the film substrate is one of a cycloolefin-based polymer film and a cellulose-based polymer film.

3. The method according to claim 2 , wherein a material for forming the re-releasable film is one of an ester-based polymer film and an acrylic-based polymer film.

4. The method according to claim 2 , wherein the film substrate has a thickness of 20 μm to 50 μm, the re-releasable film has a thickness of 30 μm to 150 μm, and the laminate film substrate has a thickness of 100 μm to 200 μm.

5. The method according to claim 2 , wherein the rubbing treatment is a rubbing treatment of a tension web method.

6. The method according to claim 2 , wherein the liquid crystal compound is any one of an azo compound, an anthraquinone compound, a perylene compound, a quinophthalene compound, a naphthoquinone compound, a merocyanone compound or a mixture thereof.

7. The method according to claim 2 , wherein the solvent is any one of water, an alcohol, a ketone, ethylene glycol mono-ethyl ether or a thereof mixture.

8. The method according to claim 2 , wherein a system for applying the solution is any one of a wire bar, a gap coater, a comma coater, a gravure coater or a slot die.

9. The method according to claim 1 , wherein a material for forming the re-releasable film is one of an ester-based polymer film and an acrylic-based polymer film.

10. The method according to claim 1 , wherein the film substrate has a thickness of 20 μm to 50 μm, the re-releasable film has a thickness of 30 μm to 150 μm, and the laminate film substrate has a thickness of 100 μm to 200 μm.

11. The method according to claim 1 , wherein the rubbing treatment is a rubbing treatment of a tension web method.

12. The method according to claim 1 , wherein the liquid crystal compound is any one of an azo compound, an anthraquinone compound, a perylene compound, a quinophthalene compound, a naphthoquinone compound, a merocyanone compound or a mixture thereof.

13. The method according to claim 1 , wherein the solvent is any one of water, an alcohol, a ketone, ethylene glycol mono-ethyl ether or a mixture thereof.

14. The method according to claim 1 , wherein a system for applying the solution is any one of a wire bar, a gap coater, a comma coater, a gravure coater or a slot die.

Assignees

• Asanoi Yoshiaki
• Umemoto Toru
• Matsuda Shoichi
• Kameyama Tadayuki
• Nitto Denko Corp

Inventors

• Asanoi Yoshiaki
• Umemoto Toru
• Matsuda Shoichi
• Kameyama Tadayuki

Classifications

• G02B5/305

  including organic materials, e.g. polymeric layers · CPC title

• G02B5/3016 Primary

  involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528) · CPC title

• G02B5/30 Primary

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