Patent ID: 7521169

Claim:
A radiation-sensitive resin composition comprising: (A) a copolymer resin which comprises a recurring unit (1-1) shown by the following formula (I-1) and one or more other recurring units: wherein R 1a represents a hydrogen atom a methyl group, a hydroxyalkyl group having 1- 4 carbon atoms, or a perfluoroalkyl group having 1-4 carbon atoms, X 1 and X 2 individually represent a hydrogen atom, a fluorine atom, an alkyl group having 1-4 carbon atoms, or a fluoroalkyl group having 1-4 carbon atoms, 1 is an integer of 0-5, and n is an integer of 0-2, the resin being insoluble or scarcely soluble in alkali, but becoming alkali soluble by the action of an acid, and (B) a photoacid generator.