| abstract |
(57) [Summary] [Purpose] To provide a polarizing film having excellent polarization performance and excellent durability against water and heat. [Structure] At least one dye selected from the following formulas (I) and (II) is contained in a polarizing film substrate. Q1-N = N-Q2-X-Q3-N = N-Q4 (I) Wherein (I), Q1, Q 4 is phenyl which may be substituted or naphthyl group, Q2, Q 3 is an optionally substituted phenylene, X is is an azo or azoxy, X is azo, Q When 2, Q 3 is unsubstituted phenylene, Q 1, Q 4 cannot be phenyl substituted with alkylamino or with alkylamino and methyl. In formula (II), Me is a transition metal such as copper, and Q 5 and Q 6 may be substituted 1- or 2- At the naphthol residue, the hydroxy is adjacent to the azo and Me Y is azo or azoxy, R 1 and R 2 Is hydrogen, lower alkyl, lower alkoxy or sulfo. [Effect] This polarizing film has high polarization performance and high durability. |