Patent ID: 7135132

Claim:
A photochromic fluorescent polymer expressed by the following formula (1), wherein R 1 and R 2 represent CN or R 1 C═CR 2 chosen from where a broken line represents a bond to arylgroups; R 3 to R 6 represent a hydrogen atom, C 1 –C 10 alkyl or benzene and wherein n is an integer greater than 0; Ar 1 and Ar 2 are the same or different, independently represent where Y and Z represent O, S, N—CH 3 and a broken line represents a bond and a broken line with E represents a bond to the above formula (1); and Ar 3 represents where a broken line represents a bond; and R 7 to R 9 represent substituents at least one chosen from a hydrogen atom, benzene, an alkyl having not more than carbon atoms of 20, an alkylester having not more than carbon atoms of 20, and an alkoxy group having not more than carbon atoms of 20, trialkylsilyl group, or alkyleneoxy such as —(O—CH 2 CH 2 —O)— groups.