Patent ID: 6838224

Claim:
A chemical amplification, positive resist composition comprising: (A) a photoacid generator and (B) a resin which changes its solubility in an alkali developer under the action of acid and has substituents of the following general formula (1): C 6 H 11 —(CH 2 ) n OCH(CH 2 CH 3 )— (1) wherein C 6 H 11 is cyclohexyl and n is 0 or 1, and wherein the resin has a weight average molecular weight of about 3,000 to about 100,000 and has a polydispersity of up to 1.5, to form said chemical amplification, positive resist composition, and wherein the resin (B) further has acid labile groups which are selected from the group consisting of formulae (6) and (7): R 14 is a straight, branched or cyclic alkyl group of 1 to 8 carbon atoms or a substituted or unsubstituted aryl group of 6 to 20 carbon atoms, h is equal to 0 or 1, and i is equal to 0, 1, 2 or 3, satisfying 2h+i=2 or 3, R 15 is a straight, branched or cyclic alkyl group of 1 to 8 carbon atoms or a substituted or unsubstituted aryl group of 6 to 20 carbon atoms, R 16 to R 25 are independently hydrogen or monovalent hydrocarbon groups of 1 to 15 carbon atoms which optionally contain a hetero atom, a pair of R 16 to R 25 , taken together, optionally form a ring, and each of R 16 to R 25 is a divalent hydrocarbon group of 1 to 15 carbon atoms which optionally contain a hetero atom when they form a ring, or two of R 16 to R 25 which are attached to adjoining carbon atoms optionally bond together directly to form a double bond.