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In the formulae (A-3)-1 to (A-3)-18, each RL $^{43 }$may be the same or different, and represents a linear, branched, or cyclic alkyl group having 1 to 8 carbon atoms, or an aryl group having 6 to 20 carbon atoms, such as a phenyl group and a naphthyl group. RL $^{44 }$and RL $^{46 }$represent a hydrogen atom or a linear, branched, or cyclic alkyl group having 1 to 20 carbon atoms. RL $^{45 }$represents an aryl group having 6 to 20 carbon atoms, such as a phenyl group. 

Furthermore, as shown in the following formulae (A-3)- 19 and (A-3)-20, the polymer may contain RL 47 which represents a group with two or more valency such as an alkylene group and an arylene group to form intermolecular or intramolecular crosslinking. 

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