Patent ID: 6749989
Filing Date: 2004-06-15
Classification: G03F,Y10S

Abstract:
A positive-working photoresist composition which comprises, as a uniform solution in an organic solvent:(A) 100 parts by weight of a resinous compound capable of being imparted with increased solubility in an aqueous alkaline solution by interaction with an acid; (B) from 0.5 to 30 parts by weight of a radiation-sensitive acid generating compound capable of generating an acid by irradiation with a radiation; and (C) an organic solvent in an amount sufficient to dissolve the components (A) and (B), the component (A) being a copolymer consisting of the monomeric units of (a1) from 30 to 60% by moles of 2-alkyl-2-adamantyl(meth)acrylate units having the formula: in which R1 is a hydrogen atom or a methyl group and R2 is an alkyl group having 1 to 4 carbon atoms,(a2) from 20 to 50% by moles of 2-oxooxapentyl(meth)acrylate units having the formula: in which R1 is a hydrogen atom or a methyl group,(a3) from 20 to 40% by moles of 1-hydroxyadamantyl(meth)acrylate units.