Patent ID: 7749677

Claim:
A negative resist composition comprising a silsesquioxane resin (A) comprising a constituent unit (a1) represented by the following general formula (I): wherein R 1 represents a methylene group, a constituent unit (a2) represented by the following general formula (II): and a constituent unit (a3) represented by the following general formula (III): wherein R 2 represents a linear or branched alkylene group having 1 to 5 carbon atoms, and R 3 represents a linear or branched alkyl group having 1 to 5 carbon atoms, an acid generator component (B) which generates an acid upon exposure, a crosslinking agent component (C), a nitrogen-containing organic compound (D) and an organic carboxylic acid or oxo acid of phosphorus or a derivative thereof (E), wherein said silsesquioxane resin (A) comprises 50 to 95 mol % of the constituent unit (a1) 5 to 40 mol % of the constituent unit (a2), and 0 to 20 mol % of the constituent unit (a3), wherein said acid generator component (B) and said crosslinking agent component (C) are selected from a combination of an oxime sulfonate-based acid generator (B) and an ethyleneurea-based crosslinking agent (C), or a combination of a mixture of an oxime sulfonate-based acid generator and a diazomethane-based acid generator (B) and an ethyleneurea-based crosslinking agent (C).