Patent ID: 7816471
Filing Date: 2010-10-19
Classification: C08F,G03F

Abstract:
1. A process for producing a photoresist polymeric compound, having a repeating unit corresponding to at least one monomer selected from the group consisting of a monomer (a) having a lactone skeleton and a monomer (c) having an alicyclic skeleton having a hydroxyl group, and having another repeating unit corresponding to a monomer (b) having a group which becomes soluble in alkali by elimination with an acid, the process comprising a precipitation purification step (C) of precipitating or re-precipitating a polymer formed by polymerization of a mixture (I) including said monomers with a solvent being a poor solvent, wherein the poor solvent is a mixture (II) of (i) hydrocarbons, and (ii) at least one solvent selected from the group consisting of nitriles, ketones, esters and carbonates, wherein a mixing ratio of (i) to (ii) is 10/90 to 99/1 (volume ratio at 25° C.).