Patent ID: 9182670
Filing Date: 2015-11-10
Classification: C08F,G03F

Abstract:
1. A pattern forming process comprising the steps of: applying a negative resist composition onto a processable substrate to form a resist film, exposing the film patternwise to high-energy radiation, and developing the exposed film with an alkaline developer to form a resist pattern; wherein the negative resist composition is a chemically amplified negative resist composition comprising a polymer, adapted such that the polymer may turn insoluble in alkaline developer by reacting with a crosslinker and/or a recurring unit having a crosslinkable functional group in the polymer under the catalysis of an acid generated upon exposure to high-energy radiation, to form crosslinks between polymer molecules, said polymer comprising: recurring units of the general formula (1), recurring units of at least one type selected from the general formulae (2), (3), and (4), and recurring units of the general formula (5): wherein A is a C 1 -C 10 divalent hydrocarbon group in which some or all hydrogen atoms may be replaced by fluorine or a methylene moiety may be replaced by oxygen, Rf is each independently hydrogen, fluorine, trifluoromethyl, or pentafluoroethyl, with the proviso that not all Rf's are hydrogen, B is a single bond or a C R R R a is an integer of 0 to 4, b is an integer of 1 to 5, c and d each are an integer of 1 to 4, e is an integer of 0 to (4-c), f is an integer of 0 to (4-d), p is independently 0 or 1, and t is an integer of 0 to 2, wherein C is a single bond or a C 1 -C 10 alkylene group which may be separated by ethereal oxygen, R 1 is as defined above, R 6 is each independently chlorine, bromine, an optionally halo-substituted C 1 -C 8 alkoxy group, a C 6 -C 20 aromatic ring-containing hydrocarbon group selected from the group consisting of optionally alkyl-substituted, naphthyl, benzyloxy, naphthyloxy and phenethyl groups, or an optionally halo-substituted C 1 -C 12 acyloxy group, g is an integer of 1 to 5, q is 0 or 1, and s is an integer of 0 to 2, wherein the recurring units of formula (1) account for 0.5 to 10 mol % and the sum of recurring units of formulae (2), (3), and (4) accounts for 50 to 99.5 mol %, based on the entire recurring units of the polymer.