Azo compounds, and dye-based polarizing films and polarizing plates comprising the same
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United States of America Patent
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May 31, 2016
Grant Date -
Mar 31, 2011
app pub date -
May 19, 2009
filing date -
May 20, 2008
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Abstract
Azo compounds represented by formula (1) or (2) (In the formulas, A represents a phenyl group or naphthyl group that has at least 1 substituent. R1-R4 represent a hydrogen atom, lower alkyl group or lower alkoxy group, with at least one of R1-R4 being a lower alkoxy group that has a sulfone group. X represents an optionally substituted amino group, optionally substituted benzoylamino group, optionally substituted phenylamino group, optionally substituted phenyl azo group or optionally substituted naphthotriazole group) and salts thereof.
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