Patent ID: 8193285

Claim:
A microphase separation structure having a domain size of 20 nm or less, formed with a block copolymer having a mass average molecular weight of 50,000 or less, represented by formula (I) A-C-B (I) wherein: A represents a segment which is a homopolymer or random or block copolymer consisting of at least 1 kind of repeat units represented by formula (II) wherein: R 1 represents a hydrogen atom, fluorine atom, (R 4 ) 3 Si group, C 1-6 linear, branched or cyclic alkyl group, or C 1-6 linear, branched, or cyclic alkyl fluoride group; n represents an integer of 1 to 5; and R 4 represents independently a C 1-6 linear, branched, or cyclic alkyl group, C 6 - 14 aryl group, C 7-16 arylalkyl group, or heterocyclic group; B represents a segment which is a homopolymer, or a random or block copolymer consisting of at least 1 kind of repeat units represented by formula (III) wherein: R 2 represents a hydrogen atom or C 1-6 linear alkyl group; R 3 represents a hydrogen atom, C 1-6 linear, branched, or cyclic alkyl group, or R 5 (R 6 ) m group; R 5 represents C 1-20 linear, branched, or cyclic alkylene group; R 6 represents OH group, C 1-6 linear, branched, or cyclic alkyloxy group, COOH group, COCH 3 group, acetylacetone group, phosphate group, amino group, nitro group, cyano group, or epoxy group; R 5 (R 6 ) m represents that m×R 6 are bound to R 5 ; and m represents an integer of 1; and C represents A, B, or A-B; however, at least 1 segment of each A has a water-repellent group, or at least 1 segment of each B has a polar group; the microphase separation structure consists of a sea-island structure or a pillar structure; and 80 to 98 mol% of the block copolymer of formula (I) consists of styrene repeat units.