Patent ID: 6933094

Claim:
A negative-tone radiation-sensitive resin composition comprising (A2) a copolymer which comprises a recurring unit shown by the following formula (1) and a recurring unit shown by the following formula (3-1), (B) a photoacid generator, and (C) a compound which can cross-link the copolymer (A1) in the presence of an acid, wherein R 1 represents a hydrogen atom or a methyl group; wherein R 1 represents a hydrogen atom or a methyl group, R 3 and R 4 individually represent a substituted or unsubstituted alkyl group having 1-12 carbon atoms, a substituted or unsubstituted aromatic group having 6-15 carbon atoms, or a substituted or unsubstituted alkoxyl group having 1-12 carbon atoms, or R 3 and R 4 may form, in combination and together with the nitrogen atom with which the R 3 and R 4 groups bond, a cyclic structure having 3-15 carbon atoms.