Patent ID: 8492483

Claim:
An ABA triblock copolymer of vinyl ether series comprising: Segment A comprising an oxystyrene-series repeat unit (a) represented by the following general formula (1): wherein in the formula, R 1 represents hydrogen atom or an alkyl group with 1 to 4 carbon atoms; R 2 is hydrogen atom; and n represents a numerical figure of 1 or 2; and Segment B comprising vinyl ether-series repeat unit (b) represented by the following general formula (2): wherein in the formula, R 3 represents a linear or branched alkyl group with 1 to 6 carbon atoms, a fluoroalkyl group as a linear or branched alkyl group with 1 to 6 carbon atoms in which all or a part of the hydrogens in the alkyl group is substituted with fluorine, an alkoxyalkyl group with 2 to 6 carbon atoms, a cycloalkyl group with 5 to 10 carbon atoms or an aryl group or arylalkyl group represented by —(CH 2 ) m —X wherein m is 0, 1, 2 or 3; X represents unsubstituted phenyl group, or phenyl group substituted with one or more linear or branched alkyl groups with one to 4 carbon atoms, a fluoroalkyl group as a linear or branched alkyl group with 1 to 4 carbon atoms in which all or a part of the hydrogens is substituted with fluorine, an alkoxy group with 1 to 4 carbon atoms, or a halogen atom, wherein each Segment A is attached to the Segment B via a carbon-carbon single bond.