Patent ID: 8012603

Claim:
A polymer compound comprising a repeating unit of below formula (1), and having a polystyrene reduced number average molecular weight of 10 3 to 10 8 , wherein, Ar 1 and Ar 2 each independently represent a trivalent aromatic hydrocarbon group or a trivalent aromatic heterocyclic group having adjacent carbons, —X 1 —X 2 — represents a group selected from: and wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 each independently represent a hydrogen atom, halogen atom, alkyl group, alkyloxy group, alkylthio group, aryl group, aryloxy group, arylthio group, arylalkyl group, arylalkyloxy group, arylalkylthio group, acyl group, acyloxy group, amide group, acid imide group, imine residue, amino group, substituted amino group, substituted silyl group, substituted silyloxy group, substituted silylthio group, substituted silylamino group, a monovalent heterocyclic group, arylalkenyl group, arylethynyl group, carboxyl group or cyano group, R 1 and R 2 , or R 3 and R 4 may be connected mutually to form a ring, X 1 and X 2 are not the same, X 1 and Ar 2 bond to adjacent carbons in the aromatic ring of Ar 1 , and X 2 and Ar 1 bond to adjacent carbons in the aromatic ring of Ar 2 .