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Title:
DYE-BASED POLARIZING ELEMENT AND POLARIZING PLATE
Document Type and Number:
WIPO Patent Application WO/2012/165223
Kind Code:
A1
Abstract:
[Problem] To develop a polarizing element having high durability and having favorable polarization properties without using a starting material belonging to a specific chemical substance such as a dianisidine. [Solution] The polarizing element, which contains dichroic pigments and comprises a film of a stretched polyvinylalcohol resin or a derivative thereof, is characterized by at least one of the dichroic pigments being the azo compound represented by formula (1) or a salt thereof. (In the formula: A indicates a benzene ring or a naphthyl group that is unsubstituted or has at least one substituent group selected from the group consisting of a sulfo group, an alkyl group, an alkoxy group, an alkoxyl group having a sulfo group, a carboxy group, a nitro group, an amino group, and a substituted amino group; R1, R2, R3, and R4 each independently indicate a hydrogen atom, an alkyl group, an alkoxy group, a sulfo group, or an alkoxy group having a sulfo group.)

Inventors:
MOCHIZUKI NORIAKI (JP)
HIGETA TAKAHIRO (JP)
NISHIGUCHI TAKUTO (JP)
Application Number:
PCT/JP2012/063048
Publication Date:
December 06, 2012
Filing Date:
May 22, 2012
Export Citation:
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Assignee:
NIPPON KAYAKU KK (JP)
POLATECHNO CO LTD (JP)
MOCHIZUKI NORIAKI (JP)
HIGETA TAKAHIRO (JP)
NISHIGUCHI TAKUTO (JP)
International Classes:
C09B33/28; G02B5/30; C09B45/28; G02F1/1335
Domestic Patent References:
WO2004092282A12004-10-28
Foreign References:
JPH0553014A1993-03-05
JPH03769A1991-01-07
JPS57145155A1982-09-08
JPH0718192A1995-01-20
JPS645623B21989-01-31
JPH0718192A1995-01-20
JP2985408B21999-11-29
JP2004075719A2004-03-11
JP2001033627A2001-02-09
JP2002296417A2002-10-09
JP2003215338A2003-07-30
JP2001056412A2001-02-27
JP2001027708A2001-01-30
JPH11218611A1999-08-10
JPH11218610A1999-08-10
JPS60156759A1985-08-16
Other References:
See also references of EP 2717076A4
Attorney, Agent or Firm:
IWASE, Yoshikazu et al. (JP)
Iwase Yoshiwa (JP)
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Claims:



 
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