Patent ID: 7045471
Filing Date: 2006-05-16
Classification: G03F

Abstract:
1. A method of forming a reverse tapered resist pattern by use of a negative-working radiation sensitive resin composition, wherein the negative-working radiation sensitive resin composition comprises an alkali-soluble resin obtained by polycondensation of methylol bisphenol compounds represented by the general formula (I) below, phenol compounds used at the ratio of from 40:60 to 100:0 by weight, respectively and aldehydes; wherein R 1 to R 4 each represent a hydrogen atom, a C 1 to C 3 alkyl group or —CH 2 OH whereupon at least one of R 1 to R 4 represents —CH 2 OH, and R 5 and R 6 each represent a hydrogen atom or a C 1 to C 3 alkyl group.