Patent ID: 9057949
Filing Date: 2015-06-16
Classification: C08F,G03F

Abstract:
1. A pattern forming process comprising the steps of applying a resist composition comprising a polymer adapted to undergo deprotection reaction under the action of an acid, to form a hydroxyl group, which in turn, reacts with any neighboring ester to form a lactone ring so that the polymer may reduce its solubility in an organic solvent developer, an acid generator, and an organic solvent onto a substrate, prebaking the composition to form a resist film, exposing the resist film to high-energy radiation, baking, and developing the exposed film in an organic solvent-based developer to form a negative pattern wherein the unexposed region of film is dissolved away and the exposed region of film is not dissolved, wherein said polymer comprises recurring units of at least one type selected from the general formulae (1) and (2):  wherein R