Hydroxy Containing (h Of -oh May Be Replaced By A Group Ia Or Iia Light Metal) Patents (Class 568/638)
  • Patent number: 4132706
    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