Patent ID: 8921836

Claim:
A polymer compound having a repeating unit represented by the formula (1): wherein Ar 1 and Ar 2 are identical or different and are each an aromatic hydrocarbon ring which may have a substituent, a heterocycle which may have a substituent, or a fused ring of an aromatic hydrocarbon ring which may have a substituent and a heterocycle which may have a substituent; and R 1 , R 2 , R 3 and R 4 are identical or different and each represent a hydrogen atom, an alkyl group, an alkoxy group, an alkylthio group, an aryl group, an aryloxy group, an arylthio group, an arylalkyl group, an arylalkoxy group, an arylalkylthio group, a substituted silyl group, an unsubstituted or substituted carboxyl group, a monovalent heterocyclic group which may have a substituent, a cyano group or a fluorine atom.