Patent ID: 9551931
Date: 2017-01-24
CPC Classifications: C07C,C08F,G03F,H01L

Claim:
1. A method of forming a pattern, comprising: (a) forming a film of an actinic-ray- or radiation-sensitive resin composition, (b) exposing the film to light, and (c) developing the exposed film with a developer comprising an organic solvent to thereby form a negative pattern, wherein the actinic-ray- or radiation-sensitive resin composition comprises: (A) a resin whose solubility in the developer comprising an organic solvent is lowered when acted on by an acid, which resin contains a repeating unit with any of lactone structures of general formula (1) below, and (B) a compound that when exposed to actinic rays or radiation, generates an acid, in which R a is an integer of 0 to 4.