Patent ID: 8703408

Claim:
A pattern forming process comprising the steps of coating a resist composition comprising a polymer comprising recurring units (a1) or (a2) and (b) represented by the general formula (1), an acid generator, and an organic solvent or a resist composition comprising a polymer comprising recurring units (a1) or (a2) represented by the general formula (1), a polymer comprising recurring units (b) represented by the general formula (1), an acid generator, and an organic solvent onto a substrate, heat treating the composition to form a resist film, exposing the resist film to high-energy radiation, heat treating, and developing the exposed film two times with an organic solvent and an alkaline aqueous solution: wherein R 1 , R 4 , and R 6 are each independently hydrogen or methyl, R 2 is a (m+1)-valent, straight, branched or cyclic, C 1 -C 16 hydrocarbon group which may contain an ether group, ester group or lactone ring, R 3 , R 5 , and R 7 are each independently an acid labile group, m is an integer of 1 to 3, Z is a single bond or —C(═O)—O—R 8 —, R 8 is a straight, branched or cyclic C 1 -C 10 alkylene group which may contain an ether group, ester group, lactone ring or hydroxyl group, or a naphthylene group, the number of the recurring units, a1, a2, and b are in the range: 0≦a1≦1.0, 0≦a2<1.0, 0<b<1.0, 0<a1+a2<1.0, and 0<a1+a2+b≦1.0.