Patent ID: 9405190
Filing Date: 2016-08-02
CPC Classification: G03F

Claim Text:
1. A method for forming a resist pattern comprising: forming a resist film on a support by using a resist composition which generates an acid upon exposure and whose solubility in a developing solution changes by the action of the acid; exposing the resist film; and subjecting the exposed resist film to patterning by negative type development with a developing solution containing an organic solvent to form a resist pattern, wherein the resist composition contains: a high-molecular weight compound having a constituent unit (a1) represented by the following general formula, a constituent unit (a2) containing a lactone-containing cyclic group, and a constituent unit (a3) containing a polar group-containing aliphatic hydrocarbon group: wherein R represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, or a halogenated alkyl group having 1 to 5 carbon atoms; Va 0 represents a divalent hydrocarbon group which may have an ether bond, a urethane bond, or an amide bond; n a0 is an integer of 0 to 2; R 1 represents a chain or cyclic aliphatic hydrocarbon group; R 2 represents a group for forming a monocyclic group together with the carbon atom to which R 1 is bonded; and R 3 represents a cyclic group which may have a substituent; and an acid generator which generates acid upon exposure, wherein the solubility of the high-molecular weight compound in a developing solution is changed by the action of the acid.