| 摘要 |
A polymer film comprising at least one compound represented by formula (I) is disclosed. A1 and A2 each independently represent a group having a Hammett's sigmap value of 0.2 or more, or bond each other to form a cyclic active methylene structure; and X1 and X2 each independently represent a hydrogen atom, aryl group, hetero-cyclic group, cyano, N-alkyl- or N-aryl-carbamoyl, or alkyl- or aryl-oxycarbonyl, or bond each other to form a saturated ring in which nitrogen and carbon atoms are embedded, and the group and ring may have at least one substituent. |
