Patent ID: 8198205

Claim:
A decomposition method of an aromatic block copolymer, wherein the aromatic block copolymer comprises a segment 1 represented by the following general formula (1) and a segment 2 comprising a structural unit represented by the following general formula (2) and/or a structural unit represented by the following general formula (3), and the segment 2 is subjected to chemical decomposition to form a high molecular component comprising the segment 1 wherein m represents an integer of 5 or more, Ar 1 represents a divalent aromatic group that may have a substituent, and Ar 1 s of 5 or more may be the same as or different from each other, Ar 10 —X 10 (2) Ar 20 —Y 20 —Ar 21 —X 20 (3) wherein Ar 10 , Ar 20 and Ar 21 each independently represent a divalent aromatic group that may have a substituent, X 10 and X 20 each independently represent an oxygen atom, a sulfur atom, an alkylene group having 1 to 10 carbon atoms or a fluorine-substituted alkylene group having 1 to 10 carbon atoms, and Y 20 represents a sulfonyl group, a carbonyl group or a fluorine-substituted alkylene group having 1 to 20 carbon atoms; wherein the chemical decomposition is a chemical decomposition decomposing the aromatic block copolymer by a basic compound; and wherein the basic compound contains an organic amine.