Patent ID: 7323284

Claim:
A negative type radiation sensitive resin composition comprising: (A) an alkali-soluble resin containing the polymerized unit of a polymerizable unsaturated compound having a phenolic hydroxyl group and having a weight average molecular weight of 4,100 to 20,000 and a weight average molecular weight/number average molecular weight ratio of more than 1.25 to not more than 2.00; (B) a radiation sensitive acid generating agent; and (C) an acid crosslinking agent; wherein the alkali-soluble resin (A) is at least one copolymer selected from the group consisting of a copolymer of p-vinylphenol and styrene and a copolymer of p-vinylphenol and α-methylstyrene; and wherein the acid crosslinking agent (C) is an N-(alkoxymethyl)glycoluril compound represented by the following formula (8): wherein R 23 to R 26 are each independently an alkyl group having 1 to 4 carbon atoms or a combination of an N-(alkoxymethyl)glycoluril compound represented by the formula (8) and a compound represented by the following formula (12): wherein As are each independently an α-hydroxyisopropyl group or hydrogen atom, with the proviso that at least one A is an α-hydroxyisopropyl group, and R 39 is a hydrogen atom, hydroxyl group, linear or branched alkylcarbonyl group having 2 to 6 carbon atoms, or linear or branched alkoxycarbonyl group having 2 to 6 carbon atoms.