Patent Number: 6,200,479

Title: Phenolic resin purification

Abstract: The invention is for a process of removing acid salt contaminants from a resin solution. The process comprises providing an organic solution of a phenolic resin having a portion of its phenolic hydroxyl groups condensed with an acid halide in the presence of a base catalyst. The organic solutions is then contacted with a strong acid cation exchange resin and a base anion exchange resin for a time sufficient to remove essentially all of said acid salt contaminants. Acid salt contamination is reduced to a level below normal detection limits.

Inventors: Zampini; Anthony (Westborough, MA), Sandford; Harold F. (Groton, MA)


International Classification: B01J 39/00 (20060101); B01J 39/04 (20060101); C08G 8/28 (20060101); C08G 8/00 (20060101); C08G 8/10 (20060101); G03F 7/023 (20060101); B01D 015/04 ()

Expiration Date: 03/12013