Patent ID: 9250532
Filing Date: 2016-02-02
CPC Classification: G03F

Claim Text:
1. A pattern forming method comprising: (i) a step of forming a first film on a substrate by using a first resin composition (I), (ii) a step of forming a second film on the first film by using a second resin composition (II) different from the resin composition (I) and which contains a basic compound, (iii) a step of exposing a multi-layered film having the first film and the second film, and (iv) a step of developing the first film and the second film in the exposed multi-layered film by using an organic solvent-containing developer to form a negative pattern, wherein the first resin composition (I) contains a resin containing a repeating unit having a group capable of decomposing by the action of an acid to produce a polar group.