Patent ID: 8039056

Claim:
A method of manufacturing a polymer thin film in which cylindrical phases are distributed in a continuous phase, and the cylindrical phases are provided in a substantially periodic array pattern and oriented in a pass-through-direction of the polymer thin film, comprising the steps of: applying a solution on a surface of a substrate, the solution containing a solvent and at least a first block copolymer comprising a block chain A 1 , as a component of the continuous phase, composed of polymerized monomers a 1 , and a block chain B 1 , as a component of the cylindrical phases, composed of polymerized monomers b 1 , and, a second block copolymer comprising at least a block chain A 2 , as a component of the continuous phase, composed of polymerized monomers a 2 , and a block chain B 2 , as a component of the cylindrical phases, composed of polymerized monomers b 2 , the second block copolymer having a degree of polymerization different from that of the first block copolymer, a weight fraction of the first block copolymer is not less than 65% and not more than 95% of a total weight of the first and second block copolymers, and a ratio of a molecular weight of the block chain A 1 to a molecular weight of the block chain A 2 in the second block copolymer is more than 1.0 and not more than 5.0; forming a coating by evaporating the solvent from the solution, the coating formed on the surface of the substrate having a film thickness L thereof that satisfies an expression as follows: 3 2 ⁢ r × { 1 2 ⁢ ( 2 ⁢ n - 1 ) - 0.35 } ≤ L ≤ 3 2 ⁢ r × { 1 2 ⁢ ( 2 ⁢ n - 1 ) + 0.35 } ⁢ ⁢ ( n = 1 , 2 ⁢ , 3 ) (herein, r is an average center distance between adjacent cylindrical phases); and heat treating the coating and causing microphase separation of the coating into the continuous phase and the cylindrical phases.