Patent ID: 8883379
Filing Date: 2014-11-11
Classification: C08G,C08L,C09D,G03F

Abstract:
1. A pattern forming process comprising the steps of forming a photoresist layer on a wafer, forming a protective film thereon, and exposure in vacuum, the protective film being formed from a resist protective film-forming composition, the photoresist layer being formed from a resist composition comprising a copolymer comprising recurring units of at least one type selected from recurring units (a1) and (a2) having a carboxyl group and phenol group whose hydroxyl moiety is substituted with an acid labile group, respectively, as represented by the general formula (2) and recurring units of at least one type selected from recurring units (b1) and (b2) of a sulfonium salt as represented by the general formula (3) and having a weight average molecular weight of 1,000 to 500,000, as a base resin, in formula (2), R in formula (3), R the resist protective film forming composition comprising a novolak resin of a bisphenol compound having the general formula (1) as a base resin, wherein R α is each independently hydrogen, a C 1 -C 10 alkyl group, C 2 -C 10 alkenyl group, or C 6 -C 10 aryl group, R β is a single bond or a 2n-valent C 1 -C 40 hydrocarbon group of straight, branched or cyclic structure which may have a bridged cyclic hydrocarbon radical, aliphatic unsaturation, heteroatom, or C 6 -C 30 aromatic radical, n is an integer of 1 to 4, R γ is a single bond or a straight or branched alkylene group which may have an aromatic radical, p and q each are an integer of 1 to 3.