Patent ID: 6358666
Filing Date: 2002-03-19
Classification: C08F,G03F,Y10S

Abstract:
A chemically amplified positive photoresist composition comprising a multi copolymer copolymer represented by the following formula I wherein polystyrene-calibrated weight average molecular weight (Mw) is 3,000Ëœ50,000 and molecular weight distribution(Mw/Mn) is 1.0Ëœ3.0, a low molecular additive represented by the following formula 2 or 3, an acid generator and a solvent: wherein the repeating units comprising X and Y are independent monomers, respectively, selected from the group consisting of the following formulae (II), (III) and (IV); wherein R1 is a hydrogen atom, a linear or branched alkyl group, a cyclic or polycyclic alkyl group, an alkyl carbonyl group, a branched alkyl carbonyl group, a cyclic or polycyclic alkyl carbonyl group of 1 to 20 carbon atoms such as an acetyl group, a t-butyl oxycarbonyl group, a cyclohexane carbonyl group, an adamantane carbonyl group a bicyclo[2,2,1]heptane methyl carbonyl group; R2 is a hydrogen atom, a hydroxyl group, carboxylic group, an alkyl group, an alkyl group containing an alkoxy group, a hydroxyl group or a carboxylic acid, an alkoxy group, a linear alkyl oxycarbonyl group, a branched alkyl oxycarbonyl group, an alkoxy alkyl carbonyl group, a cyclic alkyl oxycarbonyl group or polycyclic alkyl oxycarbonyl group of 1 to 20 carbon atoms; R3 is a hydrogen atom, a linear or branched alkyl group, a cyclic or polycyclic alkyl group of 1 to 20 carbon atoms such as a methyl group, an ethyl group, a t-butyl group, an isopropyl group, an adamantyl group, a bicyclo[2,2,1]heptane methyl group; l, m, n and o, which respresents the repeating units of a polymer, are 0&lE;1/(1+m+n+o)&lE;0.5, 0&lE;m/(1+m+n+o)&lE;0.5, 0&lE;n/(1+m+n+o)&lE;0.35 and 0.4&lE;o/(1+m+n+o)&lE;0.6, repectively, with a value of 0.15&lE;(1+m)/(1+m+n+o)&lE;0.5; wherein R1 is the same as defined above; wherein R2 and R3 are the same as defined above.