Patents by Inventor Donald J. Burchell, Jr.

Donald J. Burchell, Jr. 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 elastomers prepared from high molecular weight prepolymers
    Patent number: 4701476
    Abstract: This invention is an improvement in a process for preparing polyurethane and/or polyurea polymers wherein an isocyanate terminated quasi-prepolymer is reacted with an active hydrogen-containing composition to form a polyurethane and/or polyurea polymer, the improvement comprising employing as the quasi-prepolymer a solution of an isocyanate terminated prepolymer in a monomeric polyisocyanate, wherein said isocyanate-terminated prepolymer is the reaction product of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive material, and said isocyanate-terminated prepolymer has an average molecular weight of at least twice that of said relatively high equivalent weight isocyanate-reactive material.
    Type: Grant
    Filed: December 27, 1985
    Date of Patent: October 20, 1987
    Assignee: The Dow Chemical Company
    Inventors: Donald J. Burchell, Jr., Richard D. Peffley