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Title:
COMPOSITION, AND MANUFACTURING METHOD FOR POLARIZING FILM FOR USE THEREWITH
Document Type and Number:
WIPO Patent Application WO/2012/124407
Kind Code:
A1
Abstract:
[Problem] Conventional polarizing films with an aromatic bisazo compound have a low dichroic ratio due to the aromatic bisazo compound not being sufficiently oriented. This is assumed to result from low purity levels of the aromatic bisazo compound. [Solution] A manufacturing method for a polarizing film according to the present invention has a step A and a step B. In step A an aromatic bisazo compound that has a sulfonic acid group, or an aromatic bisazo compound that has a carboxylate group, is refined using reverse-phased chromatography and set so that the purity levels as determined by high-speed liquid chromatography at UV254 nm are 90% or higher. In step B an aqueous solvent having the refined aromatic bisazo compound obtained in step A is flow-cast into a thin film, whereby a polarizing film is obtained.

Inventors:
NAKANISHI SADAHIRO (JP)
SUZUKI SATORU (JP)
SHIMIZU HISAE (JP)
KUROGI MIYUKI (JP)
Application Number:
PCT/JP2012/052766
Publication Date:
September 20, 2012
Filing Date:
February 07, 2012
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Assignee:
NITTO DENKO CORP (JP)
NAKANISHI SADAHIRO (JP)
SUZUKI SATORU (JP)
SHIMIZU HISAE (JP)
KUROGI MIYUKI (JP)
International Classes:
C09B67/20; C09B31/08; C09B67/54; G02B5/30
Domestic Patent References:
WO2006003893A12006-01-12
Foreign References:
JP2003215338A2003-07-30
JP2009215442A2009-09-24
JP2007099823A2007-04-19
JPH0853625A1996-02-27
JPH04224867A1992-08-14
JP2009538957A2009-11-12
JP2011016922A2011-01-27
Attorney, Agent or Firm:
KUSUMOTO, Takayoshi (JP)
Takayoshi Kusumoto (JP)
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