Patents by Inventor Paul P. Caruso

Paul P. Caruso has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Polyurethane curing agent dispersion, process and product
    Patent number: 4282344
    Abstract: To a dispersion of a complex of 3 moles of 4,4'-methylenedianiline with 1 mole of a specified inorganic salt in an inert liquid, which still contains some free methylenedianiline, there is added, with agitation, at least 0.5 equivalent of an organic isocyanate per equivalent of free methylenedianiline. Then, there is added, while continuing agitation, at least 0.5 weight % of lecithin. The resulting dispersion is a good curing agent for isocyanato-terminated polyurethane prepolymers. Compositions containing both the prepolymer and the curing agent of this invention have good shelf stability at room temperature and cure to polyurethane products having good physical properties and hydrolytic stability.
    Type: Grant
    Filed: November 21, 1979
    Date of Patent: August 4, 1981
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Paul P. Caruso