Abstract:
A branched polymer represented by formula (I): wherein at least one of L1, L2, L3, and L4 is a univalent organic group represented by formula (II): wherein L5, L6 and L7 are independently hydrogen or a univalent organic group, D1, D2 and D3 being independently a single bond or a divalent group, at least one of D1, D2, and D3 containing in which R1 is hydrogen or a methyl group and n is an integer ranging from 1 to 1000; and the remainder of L1, L2, L3, and L4 being independently hydrogen or a univalent organic group represented by formula (III): wherein R is a univalent end group, with the proviso that, when one of the remainder is hydrogen, the others of the remainder cannot be hydrogen.