Patent ID: 6838225

Claim:
A radiation-sensitive resin composition comprising: (A) an acid-dissociable group-containing resin which is insoluble or scarcely soluble in alkali and becomes alkali soluble when the acid-dissociable group dissociates, the resin comprising the recurring unit of the following formula (1) and the recurring unit of the following formula (2), wherein R 1 and R 2 individually represent a hydrogen atom or methyl group, R 3 represents a hydrogen atom or methyl group, and R 4 individually represents a linear or branched alkyl group having 1-4 carbon atoms or a monovalent alicyclic hydrocarbon group having 4-20 carbon atoms or a derivative thereof, or any two of R 4 groups form in combination a divalent alicyclic hydrocarbon group having 4-20 carbon atoms or a derivative thereof, with the remaining R 4 group being a linear or branched alkyl group having 1-4 carbon atoms or a monovalent alicyclic hydrocarbon group having 4-20 carbon atoms or a derivative thereof, and (B) a photoacid generator of the following formula (3), wherein R 5 represents a monovalent aromatic hydrocarbon group having 6-20 carbon atoms or a derivative thereof, m is an integer of 1-8, and n is an integer of 0-5.