Patents Examined by Steven Marguis
  • Method of incorporating polyamine into a cationic resin
    Patent number: 5089100
    Abstract: Disclosed herein is a method of incorporating amine functionality onto a polyepoxy resin to be used for cathodic electrocoat. This method has the following steps:a) reacting an epoxy resin with an amount of secondary amine so that unreacted epoxy functional groups remain; andb) further reacting the reaction product of a) with a polyamine so that there is a minimum of one equivalent of epoxy for every mole of polyamine. This method results in an electrocoat bath with the desired high pH and a stable dispersion.
    Type: Grant
    Filed: August 6, 1990
    Date of Patent: February 18, 1992
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: / Tapan K. Debroy, Ding Y. Chung