Azo compound and polarizing film and polarizing plate each containing the same
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United States of America Patent
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Apr 7, 2009
Grant Date -
Jul 19, 2007
app pub date -
Feb 1, 2005
filing date -
Feb 4, 2004
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Expired
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Abstract
A polarizing film or polarizing plate containing, as a dichroic dye, an azo compound whose free acid form is represented by the following formula (1):wherein R1 and R2 each independently represents sulfo, carboxy, lower alkyl, or lower alkoxy; R3 represents lower alkyl, lower alkoxy, or acetylamino; R4 to R6 each independently represents hydrogen, lower alkyl, lower alkoxy, or acetylamino; and R7 represents hydrogen, amino, or hydroxy. The polarizing film and plate are excellent in polarizing performance and durability and are highly reduced in color leakage in the visible light region.
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