Patent ID: 9250531
Filing Date: 2016-02-02
CPC Classification: C08F,G03F

Claim Text:
1. A method of forming a resist pattern comprising: forming a resist film on a substrate using a resist composition containing a base component (A) which exhibits decreased solubility in an organic solvent by action of an acid and contains a resin component (A1) comprising a structural unit (a0) which generates acid upon exposure and a structural unit (a1) derived from an acrylate ester in which the hydrogen atom bonded to the carbon atom at the α-position is or is not substituted with a substituent and contains an acid decomposable group which exhibits increased polarity by the action of acid; exposing the resist film; and patterning by a negative-tone development using a developing solution consisting of the organic solvent comprising a nitrile solvent, thereby forming a negative tone resist pattern in which the unexposed portions of the resist film have been removed.