Patent ID: 7638261

Claim:
A radiation-sensitive resin composition comprising: (A) a resin which comprises from 5 to 90 mole percent of a recurring unit (1-1) shown by the following formula (I-1): 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 comprising at least one compound selected from the group consisting of 1-(4-n-butoxynaphthalen-1-yl)tetrahydrothiophenium nonafluoro-n-butanesulfonate and bis(4-t-butylphenyl)iodonium nonafluoro-n-butanesulfonate, wherein the resin does not comprise an aromatic ring.