Patent ID: 6340553
Filing Date: 2002-01-22
Classification: G03F,Y10S

Abstract:
A positive-working chemical-amplification photoresist composition which comprises, as a uniform solution in an organic solvent:(A) a resinous ingredient capable of being imparted with an increase in solubility in an aqueous alkaline solution by interacting with an acid and consisting essentially of (a) hydroxystyrene units or hydroxy-&agr;-methylstyrene units, (b) styrene units and (c) 1-alkylcyclohexyl (meth)acrylate units represented by the general formula in which R1 is a hydrogen atom or a methyl group and R2 is an alkyl group having 1 to 5 carbon atoms, and wherein component (A) is a combination of a first copolymeric resin consisting essentially of the monomeric units (a), (b) and (c) in molar fractions of 50 to 70%, 10 to 30% and 10 to 20%, respectively, and a second copolymeric resin consisting essentially of the monomeric units (a), (b) and (c) in molar fractions of 50 to 70%, 20 to 40% and 2 to 10%, respectively, in a weight proportion in the range from 90:10 to 50:50;(B) a radiation-sensitive acid-generating agent capable of releasing an acid by irradiation with actinic rays in an amount in the range from 1 to 10 parts by weight per 100 parts by weight of the component (A).