Patent ID: 7163781

Claim:
A process for producing a semiconductor device, comprising the steps of: forming, on an etching film formed on a substrate, a film containing a resist composition which comprises a resist resin obtained by copolymerizing at least one monomer selected from monomers represented by the general formulas (I-1) and (I-2): wherein R is acryloyl or methacryloyl group, R 11 and R 12 are hydrogen atom or a monovalent alkyl group, with proviso that at least one of R 11 and R 12 is monovalent alkyl group, and R 13 is OH group, ═O group, COOH group or COOR 14 group, wherein R 14 is a monovalent organic group, wherein R is an acryloyl or methacryloyl group, R 31 is hydrogen atom, or at least one group selected from the group consisting of OH group, OR 14 group, wherein R 14 is a monovalent organic group, and ═O group, R 32 is hydrogen atom or a monovalent organic group, and R 41 is vinyl, acryloyl or methacryloyl group, and a photo acid generator, subjecting the film coated onto the substrate to pattern-wise exposure, developing the film exposed to light, thereby forming a patterned photomask, and etching an etching film by dry etching, using the photomask as a mask.