Patent ID: 8080362
Filing Date: 2011-12-20
Classification: G03F,Y10S

Abstract:
1. A positive resist composition consisting essentially of: (a) a resin that is decomposed by the action of an acid to increase solubility in an alkali developing solution, contains a structural unit having a group represented by formula (X) shown below, has a weight average molecular weight of not more than 5,000, and contains an acid decomposable group in an amount of not more than 40% based on the sum total of the number of acid decomposable groups and the number of alkali-soluble groups not protected with the acid decomposable group, in formula (X), R1 and R2, which may be the same or different, each represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms; R3 and R4, which may be the same or different, each represents a hydrogen atom or an alkyl group; Z represents a group represented by formula (X′) or formula (X″); and m represents an integer of from 1 to 20; (b) a compound that generates an acid upon irradiation with an actinic ray or radiation; (c) a nitrogen-containing basic compound; (d) a solvent; and (e) a surfactant; wherein the resin comprises a structural unit (B-29) or a structural unit (B-32) shown below: