Patent ID: 8426115
Filing Date: 2013-04-23
Classification: G03F

Abstract:
1. A process for forming a pattern, comprising the steps of: coating a first positive resist composition comprising a copolymer comprising recurring units having lactone as an adhesive group, recurring units having an acid labile group, and recurring units having a carbamate structure, and a photoacid generator onto a substrate to form a first resist film, exposing the first resist film to high-energy radiation, post-exposure baking, and developing the first resist film with a developer to form a first resist pattern, heating the first resist pattern at 100 to 200° C. for 3 to 200 seconds for inactivating the first resist pattern to acid, coating a second positive resist composition comprising a solvent containing an alcohol of 3 to 8 carbon atoms and an optional ether of 6 to 12 carbon atoms onto the first resist pattern-bearing substrate to form a second resist film, exposing the second resist film to high-energy radiation, post-exposure baking, and developing the second resist film with a developer to form a second resist pattern, wherein said recurring units having a carbamate structure are represented by formula (a1) or (a2) in the following general formula (1): wherein R R R —C(═O)—R R R