Patent ID: 7015291
Filing Date: 2006-03-21
Classification: C08F,G03F

Abstract:
1. A process for producing a photoresist polymeric compound, which has a repeated unit corresponding to at least one monomer selected from a monomer (a) having a lactone skeleton, a monomer (b) having a group which becomes soluble in alkali by elimination with an acid, and a monomer (c) having an alicyclic skeleton having a hydroxyl group, which process comprises: the polymerization step (A) of subjecting a mixture of monomers containing at least one monomer selected from the above monomers (a), (b), and (c) to polymerization in a glycol or ester solvent by a dropping polymerization method, and the extraction step (B) comprising the step of adding an organic solvent having a specific gravity of 0.95 or less and a solubility parameter (SP value) of 20 MPa