Polyazo compound or salt thereof and dye-based polarization film containing the same

摘要

A polyazo compound or salt thereof covering the region of from 500 to 580 nm and manifesting high initial polarization ability and represented by the following formulae (I) or (II):wherein,A represents a phenyl having sulfo and/or carboxyl and optionally having a lower alkyl or lower alkoxy, or a naphthyl having 1 to 3 sulfos,R<1 >to R<6 >represent hydrogen, lower alkyl or alkoxy,m and n each independently represent 0 or 1,R<7 >represents hydrogen or sulfo,D and E each independently represents -NHCO- or -N=N-,G represents -CH2-, alkylene having 2-4 carbon atoms, phenylene or -CH=CH-,and R<8 >represents sulfo, carboxyl or lower alkoxycarbonyl; is provided.