Patent ID: 8426115

Claim:
A process for forming a pattern, comprising the steps of: coating a first positive resist composition comprising a copolymer comprising recurring units having lactone as an adhesive group, recurring units having an acid labile group, and recurring units having a carbamate structure, and a photoacid generator onto a substrate to form a first resist film, exposing the first resist film to high-energy radiation, post-exposure baking, and developing the first resist film with a developer to form a first resist pattern, heating the first resist pattern at 100 to 200° C. for 3 to 200 seconds for inactivating the first resist pattern to acid, coating a second positive resist composition comprising a solvent containing an alcohol of 3 to 8 carbon atoms and an optional ether of 6 to 12 carbon atoms onto the first resist pattern-bearing substrate to form a second resist film, exposing the second resist film to high-energy radiation, post-exposure baking, and developing the second resist film with a developer to form a second resist pattern, wherein said recurring units having a carbamate structure are represented by formula (a1) or (a2) in the following general formula (1): wherein R 1 and R 7 are hydrogen or methyl, R 2 and R 8 are a single bond, methylene, ethylene, phenylene, phenylmethylene, phenylethylene, phenylpropylene, or —C(═O)—R 12 —, wherein R 12 is a straight, branched or cyclic C 1 —C 10 alkylene, C 6 -C 10 arylene, or C 2 -C 12 alkenylene group, R 3 and R 9 are hydrogen or a straight, branched or cyclic C 1 -C 10 alkyl, or when R 2 and R 8 are —C(═O)—R 12 —, and R 3 and R 9 may bond with R 12 to form a ring with the nitrogen atom to which they are attached, R 4 , R 5 and R 6 are hydrogen or a straight, branched or cyclic C 1 -C 10 alkyl, C 6 -C 14 aryl, or C 7 -C 14 alkenyl group, which may contain a straight, branched or cyclic C 1 -C 6 alkyl, nitro, halogen, cyano, trifluoromethyl, carbonyl, ester, lactone ring, carbonate, maleimide, amide, C 1 -C 6 alkoxy, or sulfo group, R 4 and R 5 , R 5 and R 6 , or R 4 and R 6 may bond together to form a ring with the carbon atom to which they are attached, exclusive of the case where all of R 4 , R 5 and R 6 are hydrogen or alkyl, R 10 and R 11 are a C 6 -C 14 aryl or C 7 -C 14 aralkyl group, which may contain a straight, branched or cyclic C 1 -C 6 alkyl, nitro, halogen, cyano, trifluoromethyl, C 1 -C 6 alkoxy, or carbonyl group.