Patent ID: 11440985

Abstract:
An underlayer film-forming composition which exhibits excellent solvent resistance, and which is capable of orthogonally inducing, with respect to a substrate, a microphase separation structure in a layer formed on the substrate, said layer including a block copolymer. The underlayer film-forming composition includes a copolymer which includes: (A) unit structures derived from styrene compounds including tert-butyl groups; (B) unit structures, other than those in (A) above, which are derived from aromatic-containing vinyl compounds which do not include hydroxy groups; (C) unit structures derived from compounds which include (meth)acryloyl groups, and do not include hydroxy groups; and (D) unit structures derived from compounds including crosslink-forming groups. The copolymerization ratios with respect to the whole copolymer are: (A) 25-90 mol %; (B) 0-65 mol %; (C) 0-65 mol %; and (D) 10-20 mol %. Unit structures including aromatics account for 81-90 mol % of (A)+(B)+(C).