Patent ID: 8735501

Claim:
A composition, comprising: a polymer having a repeated structural unit represented by at least one of the following formula (1) and formula (2) and having a number average molecular weight of 10000 or more and 200000 or lower, the composition further having a cross-linked structure having a repeated structural unit represented by Formula (3), and the cross-linked structure being contained in a proportion of 10 parts by weight or more and 1000 parts by weight or lower based on 100 parts by weight of the polymer, wherein, in Formulae (1) and (2), m is 0 or 1, n is an integer of 0 to 3, and p is 0 or 1, R 1 to R 14 each independently represent a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms, R 11 to R 14 may be combined with each other to form a monocyclic ring or a polycyclic ring and the monocyclic ring or the polycyclic may have a double bond, R 11 and R 13 or R 12 and R 14 may form an alkylidene group, and X, Y, and Z each are independently selected from —O—, —NH—, —S—, —CH 2 —, —CH 2 —CH 2 —, and —CH(CH 3 )—, wherein, in Formula (3), R 15 to R 20 and R′ 15 to R′ 20 each are independently selected from a hydrogen atom, a halogen atom, or a hydrocarbon group having 1 to 20 carbon atoms and A and A′ each are independently selected from —O—, —NH—, —S—, —CH 2 —, —CH 2 —CH 2 —, or —CH(CH 3 )—.