Patent ID: 6136500
Filing Date: 2000-10-24
Classification: G03F,Y10S

Abstract:
A positive radiation sensitive resin composition comprising:(A) (a) an alkali-insoluble or alkali low-soluble resin protected by an acid-decomposable group and turning alkali-soluble when said acid-decomposable group is decomposed or (b) an alkali-soluble resin and an alkali dissolution controller; and(B) a photoacid generator comprising two or more chemical compounds, one being a compound which upon exposure to radiation generates a carboxylic acid having a boiling point of 150.degree. C. or higher under atmospheric pressure and the other a compound which upon exposure to radiation generates an acid other than a carboxylic acid;wherein said alkali-insoluble or alkali low-soluble resin contains an acidic functional group in which the hydrogen atoms are replaced with one or more acid-decomposable groups,wherein said acidic functional group is a phenolic hydroxyl group or carboxylic group,wherein said acid decomposable group is selected from the group consisting of substituted methyl groups, 1-substituted ethyl groups, 1-branched alkyl groups, silyl groups, germyl groups, alkoxycarbonyl groups, acyl groups, cyclic acid decomposable groups, t-butyl group, t-butoxycarbonyl group, t-butoxycarbonylmethyl group, and 1-ethoxymethyl group, andwherein said compound which upon exposure to radiation generates a carboxylic acid is an iodonium salt or sulfonium salt.