Patent ID: 7314701

Claim:
A positive tone radiation-sensitive resin composition comprising: (A) compound shown by the following formula (1), (B) a photoacid generator, and (C-a) a resin protected by an acid-dissociable group, insoluble or scarcely soluble in alkali, but becoming soluble in alkali when the acid-dissociable group dissociates, wherein R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 individually represent a hydrogen atom, cyano group, substituted or unsubstituted alkyl group having 1-20 carbon atoms, substituted or unsubstituted alicyclic group having 3-20 carbon atoms, substituted or unsubstituted alkenyl group having 2-20 carbon atoms, substituted or unsubstituted aryl group, or substituted or unsubstituted heteroaryl group, provided that any two groups selected from R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 may be bonded together to form a ring which may comprise a hetero atom or may bond together to form a dimer and further provided that at least one of the R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 groups is not a hydrogen atom; wherein the resin (C-a) protected by an acid-dissociable group, insoluble or scarcely soluble in alkali, but becoming soluble in alkali when the acid-dissociable group dissociates comprises a recurring unit of the following formula (10), wherein R 12 represents a hydrogen atom or monovalent organic group and a and b indicates a natural number from 1 to 3.