| abstract |
A polymer film, containing a merocyanine compound having λ max of not longer than 375 nm, and a compound represented by formula (II), which is different from said at least one merocyanine compound, is disclosed. In the formula, R 1 and R 2 each independently represent a hydrogen atom, alkyl group, aryl group, heterocyclic group, cyano, N-alkyl- or N-aryl carbamoyl group, aryloxy carbonyl group or —CH 2 COOR 5 , or R 1 and R 2 bind to each other to form a ring containing a nitrogen atom; R 5 represents an alkyl group, aryl group or a heterocyclic group; R 3 and R 4 each independently represent a substituent having a Hammett substituent constant σp of equal to or more than 0.2, or R 3 and R 4 bind to each other to form a cyclic active methylene compound structure. |