Abstract: The trisubstituted (2,5-dihydroxyphenyl)phosphonium hydroxide inner salts and their hydrolyzed derivatives are novel latent catalysts for promoting reaction between vicinal epoxides and phenols and/or carboxylic acids (or anhydrides). Precatalyzed epoxy resins are easily prepared using such catalysts.
Type:
Grant
Filed:
April 5, 1976
Date of Patent:
January 2, 1979
Assignee:
The Dow Chemical Company
Inventors:
George A. Doorakian, Lawrence G. Duquette