Patent ID: 8710165

Claim:
A multibranched polymer comprising a structure represented by formula (III): where: C represents a carbon atom, X 4 and X 5 each independently represents a linking group containing any atom of Groups 14 to 16 in the Periodic Table, Y 4 represents: a group having a structure represented by formula (IV): where: T 1 represents a divalent electron attractive group represented by formula (t11) or (t21): where: Z 11 represents an oxygen atom, a sulfur atom, or a group represented by N-r71, wherein r71 represents a hydrogen atom, a C1-C6 alkyl group, a phenyl group which may have a substituent, an alkylcarbonyl group, a phenylcarbonyl group which may have a substituent, an alkylsulfonyl group, or a phenylsulfonyl group which may have a substituent, R 20 represents a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C7-C12 aralkyl group, an aryl group, an ester group, or an acyl group, R 21 represents a hydrogen atom, a C1-C6 alkyl group, a C7-C12 aralkyl group, an aryl group, an ester group, or an acyl group, and the symbol ● represents a substitution position of a halogen atom; or a group having a structure represented by formula (V): where: R 22 represents a hydrogen atom, a halogen atom, a C1-C6 alkyl group, a C7-C12 aralkyl group, an aryl group, an ester group, or an acyl group, R 23 represents a hydrogen atom, a C1-C6 alkyl group, a C7-C12 aralkyl group, an aryl group, an ester group, or an acyl group, and the symbol ● represents the substitution position of a halogen atom, R 14 represents a hydrogen atom, a C1-C6 alkyl group, an aryl group which may have a substituent, a halogen atom, or a C1-C6 alkoxyl group, n 7 and n 8 each independently represents an integer of 0 or 1 or more, wherein when n 7 and n 8 each is 2 or more, X 4 (s) and X 5 (s) may be the same or different, m 3 represents 3 or 4, groups represented by the formula: —(X 4 ) n7 —Y 4 -Q 4 may be the same or different, and Q 4 represents an arm moiety having a repeating unit derived from a polymerizable unsaturated bond.