Patent ID: 7208567

Claim:
A polymer compound having a polystyrene reduced number average molecular weight of 10 3 -10 8 , and comprising a repeating unit selected from the below formulae (2-1) to (2-5), wherein, X represents S or O; R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 , each independently represent an alkyl group, alkoxy group, aryl group, aryloxy group, arylalkyl group, arylalkoxy group, arylalkylthio group; a and b each independently represent an integer of 0-3; c, d, e, and f independently represent an integer of 0-5; g, h, i, and j each independently represent an integer of 0-7; and each of a+b, c+d, e+f, g+h, and i+j is one or more.