发明授权
US5639809A Azo compounds and polarizing films using the compounds 失效
使用该化合物的偶氮化合物和偏振膜

Azo compounds and polarizing films using the compounds
摘要:
The present invention provides a polarizing film having high heat resistance and a high degree of polarization and excellent optical properties by dyeing a polymer film with a novel azo compound represented by the following formula (1) or (2): ##STR1##
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