Patent ID: 7338740

Claim:
A positive resist composition, comprising: (A) a resin comprising at least one kind of acrylate derivative repeating units, having a glass transition temperature in the range of 70 to 155° C. and capable of increasing its solubility in an alkali developer under action of an acid, wherein the resin has repeating units of at least one kind selected from repeating units represented by the following formula (IV) and repeating units having groups represented by the following formula (V-1), (V-2), (V-3) and (V-4); and repeating units represented by the following formula (AII), (B) a compound capable of generating an acid upon irradiation with an actinic ray or radiation, and (C) a mixed an organic solvent comprising (a) at least one solvent selected from a propylene glycol monoalkyl ether carboxylate, an alkyl lactate and a linear ketone; and (b) a cyclic ketone: wherein R 1a represents a hydrogen atom or a methyl group, W 1 represents a divalent single group selected from the class consisting of a single bond, an alkylene group, an ether group, a thioether group, a carbonyl group and an ester group, or a combination thereof, R a1 , R b1 , R c1 , R d1 and R e1 each independently represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and m and n each independently represents an integer of 0 to 3, provided that m+n is from 2 to 6: wherein R 1b to R 5b each independently represents a hydrogen atom, an alkyl group, a cycloalkyl group or an alkenyl group, and any two of them may be combined with each other to form a ring: wherein R 1c represents a hydrogen atom or a methyl group, R 2c to R 4c each independently represents a hydrogen atom or a hydroxyl group, provided that at least one of R 2c to R 4c represents a hydroxyl group.