Patents by Inventor John R. Kolb

John R. Kolb 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).

  • Method for making block siloxane copolymers
    Patent number: 4348504
    Abstract: A method for synthesizing block polysiloxane copolymers. Diorganoscyclosiloxanes and an end-blocking compound are interacted in the presence of a ring opening polymerization catalyst, producing a blocked prepolymer. The prepolymer is then interacted with a silanediol, resulting in condensation polymerization of the prepolymers. A second end-blocking compound is subsequently introduced to end-cap the polymers and copolymers formed from the condensation polymerization.
    Type: Grant
    Filed: February 25, 1981
    Date of Patent: September 7, 1982
    Assignee: The United States of America as represented by the Department of Energy
    Inventors: Nora Butler, Edward S. Jessop, John R. Kolb