Patent ID: 8143343

Claim:
An immobilized microphase-separated structure formed by adding a photopolymerization initiator to a microphase-separated structure comprising a block copolymer, which contains at least a block chain A consisting of a monomer A as a repeating unit and a block chain B consisting of a monomer B as a repeating unit, and a solvent, wherein the solvent has a temperature zone 1 where the block chain A and the block chain B are soluble and a temperature zone 2 where the block chain A is insoluble but the block chain B is soluble, and the structural period thereof varies changing temperature between the temperature zone 1 and the temperature zone 2 and irradiating actinic rays thereto, wherein the amount of block copolymer is 1.0 to 15% by mass relative to the total amount of solvent and the weight average molecular weight of the block copolymer is 5.0×10 5 to 20×10 5 g/mol.