Patent ID: 8530148
Filing Date: 2013-09-10
Classification: G03F

Abstract:
1. A pattern forming method, comprising: (A) coating a substrate with a positive resist composition of which solubility in a positive developer increases and solubility in a negative developer decreases upon irradiation with actinic rays or radiation, so as to form a resist film; (B) exposing the resist film a plurality of times through a mask; and (D) developing the resist film with a negative developer, wherein the positive resist composition contains a resin whose solubility in an alkali developer increases and whose solubility in an organic solvent decreases under the action of an acid, the resin being selected from the group consisting of: (ii) an alicyclic hydrocarbon-based acid-decomposable resin having a lactone group; and (iii) an alicyclic hydrocarbon-based acid-decomposable resin containing a repeating unit having an alicyclic hydrocarbon structure substituted by a polar group, wherein the resin contains substantially no fluorine atom.