Patent ID: 6475699
Filing Date: 2002-11-05
Classification: G03F,Y10S

Abstract:
A chemically amplified positive resist composition comprisinga resin (X) which, per se, is insoluble or slightly soluble in alkali but becomes soluble in alkali when subjected to an action of acid, and has (a) a polymeric unit represented by the following formula (I): â€ƒwherein R1 represents hydrogen or methyl, R2 and R3 each independently represent alkyl having 1 to 4 carbon atoms, and R4 and R5 each independently represent hydrogen, hydroxyl or alkyl, wherein the adamantly ring bonds to the carbon linking R2 and R3 at either the 1-position or the 2-position, (b) polymeric unit, derived from an alicyclic olefin, represented by the following formula (II): â€ƒwherein R6 and R7 each independently represent hydrogen, alkyl having 1 to 3 carbon atoms, hydroxyalkyl having 1 to 3 carbon atoms, carboxyl, cyano or a group represented by â€”COOR8, wherein R8 represents an alcohol residue, â€ƒor R6and R7 together form a carboxylic acid anhydride residue represented by â€”C(&boxH;O)OC(&boxH;O)â€”, and (c) a polymeric unit derived from unsaturated dicarboxylic acid anhydride selected from maleic anhydride and itaconic anhydride; and an acid generating agent (Y).