Patent ID: 8642253
Filing Date: 2014-02-04
Classification: C08F,G03F,Y10S

Abstract:
1. A pattern forming method, comprising: forming a resist film by applying a resist composition for negative tone development, which contains (A) a resin capable of increasing a polarity of the resin (A) by an action of an acid to increase the solubility of the resin (A) in a positive tone developer which is an alkali developer and decrease the solubility of the resin (A) in a negative tone developer containing an organic solvent, (B) a compound capable of generating an acid having an acid dissociation index pKa of −4.0 or less upon irradiation with an actinic ray or radiation, and (C) a solvent; exposing the resist film; and developing the resist film after the exposing to form a negative tone pattern by using the negative tone developer, wherein in the developing step, unexposed parts of the resist film dissolve in the negative tone developer.