Patent ID: 10113083

Abstract:
The present invention provides a resist underlayer film that has a wide focus position range within which a good resist shape can be obtained. A resist underlayer film-forming composition for lithography comprising a linear polymer that is obtained by a reaction of a diepoxy group-containing compound (A) with a dicarboxyl group-containing compound (B). The linear polymer has structures of the following formulae (1), (2), and (3) derived from the diepoxy group-containing compound (A) or the dicarboxyl group-containing compound (B): The linear polymer preferably contains a polymer obtained by a reaction of two diepoxy group-containing compounds (A) each having structures of Formulae (1) and (2) with a dicarboxyl group-containing compound (B) having a structure of Formula (3), or a polymer obtained by a reaction of a diepoxy group-containing compound (A) having a structure of Formula (1) with two dicarboxyl group-containing compounds (B) each having structures of Formulae (2) and (3).