Patent ID: 6869742

Claim:
A positive photoresist composition comprising: (A) an alkali-soluble novolak resin containing 1,2-naphthoquinonediazidosulfonyl groups substituting for part of hydrogen atoms of phenolic hydroxyl groups; (B) an ester of at least one selected from compounds represented by following Formula (I) with a naphthoquinonediazidosulfonyl compound; and (C) a sensitizer (intensifier): wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and R 8 are each independently a hydrogen atom, a halogen atom, an alkyl group having from 1 to 6 carbon atoms, an alkoxyl group having from 1 to 6 carbon atoms or a cycloalkyl group; R 9 , R 10 and R 11 are each independently a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms; Q is a hydrogen atom or an alkyl group having from 1 to 6 carbon atoms, or Q is combined with R 9 to form a cycloalkyl ring having 3 to 6 carbon atom members or a residue represented by following Formula (II); a and b each independently denote an integer from 1 to 3; d denotes an integer from 0 to 3; and n denotes an integer from 0 to 3: wherein R 12 and R 13 are each independently a hydrogen atom, a halogen atom, an alkyl group having from 1 to 6 carbon atoms, an alkoxyl group having from 1 to 6 carbon atoms or a cycloalkyl group; and c denotes an integer from 1 to 3; wherein the ingredient (A) has a weight average molecular weight (Mw) in terms of polystyrene of from 4000 to 5000 and a molecular weight distribution (Mw/Mn) of less than or equal to 3.0, where Mn is a number average molecular weight.