Patent ID: 8697343
Filing Date: 2014-04-15
Classification: C08F,G03F

Abstract:
1. A resist pattern forming method comprising: providing a radiation-sensitive acid generator (C), a nitrogen-containing compound (D) and a solvent (E); polymerizing unsaturated monomers having a fluorine atom in a ketone solvent having 2 to 10 carbon atoms to form a polymer solution which includes a fluorine-containing polymer (A) dissolved in the ketone solvent; contacting the polymer solution with a hydrocarbon solvent having 5 to 10 carbon atoms to provide a homogeneous solution including the fluorine-containing polymer (A), the ketone solvent, and the hydrocarbon solvent; removing a low molecular weight component (a) from the fluorine-containing polymer (A) using the homogeneous solution to purify the fluorine-containing polymer (A) such that the purified fluorine-containing polymer (A) has a solid content of a low molecular weight component (a) of 0.1% or less by weight based on 100% by weight of the purified fluorine-containing polymer (A), wherein the low molecular weight component (a) has a weight average molecular weight determined by gel permeation chromatography of 500 or less; polymerizing unsaturated monomers having an acid-unstable group to form a resin (B) having an acid-unstable group; removing a low molecular weight component (b) from the resin (B) to purify the resin (B) such that the purified resin (B) has a solid content of a low molecular weight component (b) of 0.1% or less by weight based on 100% by weight of the purified resin (B), wherein the low molecular weight component (b) has a weight average molecular weight determined by gel permeation chromatography of 500 or less; forming a resist film using a radiation-sensitive resin composition including the purified fluorine-containing polymer (A), the purified resin (B), the radiation-sensitive acid generator (C), the nitrogen-containing compound (D) and the solvent (E); and emitting radiation to the resist film through water provided between a lens and the resist film, the fluorine-containing polymer (A) comprising a repeating unit represented by the following general formula (2), wherein R wherein the purified fluorine-containing polymer (A) has a weight average molecular weight determined by gel permeation chromatography in the range from 1,000 to 50,000, a receding contact angle with water and the resist film formed from the radiation-sensitive resin composition is 70° or more, and the content of the purified fluorine-containing polymer (A) is 0.1% or more by weight based on 100% by weight of the whole of said radiation-sensitive resin composition.