Patent ID: 7276575
Filing Date: 2007-10-02
Classification: C08F,G03F

Abstract:
1. A process for refining a crude resin of a resist resin (A) used in a photoresist composition comprising at least said resist resin (A) and an acid generator (B) dissolved in a first organic solvent (C1), comprising synthesizing a crude resin of said resist resin (A) followed by washing said synthesized crude reins of the resist resin (A) using a washing solvent by filtering off, and subsequently (i) preparing a crude resin solution comprising said washed crude resin of said resist resin (A) so that Y is smaller than X, and (ii) filtering said crude resin solution to obtain a filtrate containing a refined resin of said resist resin (A), wherein X represents a concentration of said resist resin (A) in said photoresist composition, and Y represents a concentration of said washed crude resin of said resist resin (A) in said crude resin solution dissolved in a second organic solvent (C2).