Patent ID: 8298685

Claim:
A block copolymer characterized by comprising: a block (A) comprising two or more different types of repeating units represented by the following formula (I), and a repeating unit represented by the following formula (II); and a block (B) comprising a repeating unit represented by the following formula (II), and a repeating unit represented by the following formula (III), wherein R 1 and R 6 independently represent a halogen 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, an arylalkenyl group, an arylalkynyl group, a monovalent heterocyclic group, a heterocyclic thio group, an amino group, a silyl group, an acyl group, an acyloxy group, an imine residue, an amide group, an acid imide group, a carboxyl group, a cyano group, or a nitro group, wherein R 2 , R 3 , R 4 , and R 5 independently represent a hydrogen atom, a halogen 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, an arylalkenyl group, an arylalkynyl group, a monovalent heterocyclic group, a heterocyclic thio group, an amino group, a silyl group, an acyl group, an acyloxy group, an imine residue, an amide group, an acid imide group, a carboxyl group, a cyano group, or a nitro group, m and n represent 1, and X 1 , and X 3 represent a sulfur atom, X 2 represents an oxygen atom, a sulfur atom, or —C(R 7 )═C(R 8 )— wherein R 7 and R 8 independently represent a hydrogen atom, a halogen 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, an arylalkenyl group, an arylalkynyl group, a monovalent heterocyclic group, a heterocyclic thio group, an amino group, a silyl group, an acyl group, an acyloxy group, an imine residue, an amide group, an acid imide group, a carboxyl group, a cyano group, or a nitro group, —Ar 1 — (II) wherein Ar 1 represents an arylene group, and —Ar 2 — (III) wherein Ar 2 represents a divalent aromatic amine residue.