Patent ID: 7288363

Claim:
A chemically amplified positive resist composition comprising: (A) at least one compound (1) of formula (1e) shown below, said compound (1) being capable of generating an acid upon exposure to radiation or electron beams; (B) a copolymer comprising p-hydroxystyrene and/or α-methyl-p-hydroxystyrene, p-hydroxystyrene and/or α-methyl-p-hydroxystyrene in which some of the hydrogen atoms of phenolic hydroxyl groups are replaced by acid labile groups of at least one type, and an acrylate and/or methacrylate, said acrylate and/or methacrylate being an ester protected with an acid labile group, said copolymer comprising recurring units of the general formula (2) wherein units derived from said acrylate and/or methacrylate are present in a proportion of more than 0 mol % to 50 mol %, on the average, and units having acid labile groups are present in a proportion of more than 0 mol % to 80 mol %, on the average, based on the entire copolymer, said copolymer having a weight average molecular weight of 3,000 to 100,000, wherein R 4 is hydrogen or methyl, R 5 is a straight, branched or cyclic alkyl group of 1 to 8 carbon atoms, R 6 is an acid labile group, R 6a is hydrogen or an acid labile group, at least some R 6a groups being acid labile groups, x is 0 or a positive integer, y is a positive integer, and x+y is up to 5, M is a positive integer, N and L each are 0 or a positive integer, excluding that N and L are equal to 0 at the same time, and satisfying 0<N/(M+N)≦0.5 and 0<(N+L)/(M+N+L)≦0.8; and (C) a basic compound.