RESIN COMPOSITION FOR HOLE SHRINK

摘要

PROBLEM TO BE SOLVED: To provide a resin composition for hole shrink, capable of obtaining circular fine holes having uniform size by a hole shrink process.SOLUTION: The resin composition for hole shrink comprises: a block-copolymer (I) including an aromatic ring containing polymer and a poly (meta) acrylate as a block portion and having a molecular weight of 10,000 or more and 1 million or less (a ratio of the total of the aromatic ring containing polymer portion (Ia) and the poly (meta) acrylate portion (Ib) relative to the whole I is 50 mol % or more, and a molar ratio of Ia to Ib is 1:1 to 10:1.); and an aromatic ring containing homopolymer (II) consisting of a repeating unit constituting Ia of I as a by-product of I and having a molecular weight equal to or more than that of Ia of I. A ratio of II to I is more than 0 mass% and 10 mass% or less.