Method of purifying photoacid generators for use in photoresist compositions

摘要

The present invention is directed to a process of removing trace acidic impurities from an impure solution of photoacid generating compounds in a solvent, comprising contacting an impure solution of at least one photoacid generating compound containing trace amounts of acidic impurities with an amine-containing ion exchange resin for a sufficient amount of time to remove substantially all of the acidic impurities from the impure solution, thereby producing a pure solution of at least one photoacid generating compounds substantially free of trace acidic impurities. The invention is also directed to a solution of at least one photoacid generating compound substantially free of trace acidic impurities made by the above process.