Polarizing plate and method for producing polarizing plate

Patent metadata

Field	Value
Publication number	US-2016334557-A1
Application number	US-201515110851-A
Country	US
Kind code	A1
Filing date	Jan 22, 2015
Priority date	Jan 30, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

The present invention is to provide a polarizing plate including an alignment layer applicable to various types of substrates, and having excellent light polarization properties.
A polarizing plate 1 of the present invention includes an alignment layer 3 , and a polarizing layer 4 disposed on the alignment layer 3 , and containing an organic dye having lyotropic liquid crystallinity, wherein the organic dye in the polarizing layer 4 is in a form of supramolecular aggregates, and the alignment layer 3 contains a cycloolefin based resin.

First claim

1 . A polarizing plate comprising:
an alignment layer; and a polarizing layer disposed on the alignment layer, and containing an organic dye having lyotropic liquid crystallinity, wherein the organic dye in the polarizing layer is in a form of supramolecular aggregates, and the alignment layer contains a cycloolefin based resin.

2 . The polarizing plate according to claim 1 further comprising:
a substrate,
wherein the alignment layer is disposed on the substrate.

3 . The polarizing plate according to claim 1 , wherein the cycloolefin based resin is amorphous.

4 . The polarizing plate according to claim 1 , wherein the cycloolefin based resin is a norbornene based resin.

5 . The polarizing plate according to claim 1 , wherein the alignment layer is substantially optically isotropic.

6 . The polarizing plate according to claim 2 ,
wherein the substrate is a resin film containing a resin, and the resin has a glass transition temperature (Tg) of 180° C. or less.

7 . The polarizing plate according to claim 2 , wherein the substrate has a surface having releasability.

8 . A method for producing a polarizing plate, comprising:
a step of applying a first coating liquid containing a cycloolefin based resin to form a first coating film; a step of drying the first coating film to form a first dry coating film; a step of performing an alignment treatment on a surface of the first dry coating film to form an alignment layer; a step of applying a second coating liquid containing an organic dye on the alignment layer to form a second coating film; and a step of drying the second coating film to form a second dry coating film as a polarizing layer.

9 . The method for producing a polarizing plate according to claim 8 , wherein the alignment treatment is a rubbing treatment.

Assignees

• Nitto Denko Corp

Inventors

• Asanoi Yoshiaki
• Okada Kazumasa
• Matsuda Shoichi
• Takemoto Hiroyuki

Classifications

• G02B5/3083

  Birefringent or phase retarding elements (G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001) · CPC title

• B29D11/0073

  Optical laminates · 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

• G02F1/133711

  by organic films, e.g. polymeric films · CPC title

• B29D11/00644

  polarizing · CPC title