Patents by Inventor Bonnie L. Lawson

Bonnie L. Lawson 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).

  • Modified PMDI for faster press times or lower press temperatures and reduction of MDI from hot presses
    Patent number: 6022444
    Abstract: Isocyanate prepolymers which are useful as binders are made from a polyisocyanate mixture and a hydroxyl compound having at least about 1 hydroxyl group. The polyisocyanate mixture is made up of from about 50 to about 60% by weight of polyphenyl polymethylene polyisocyanate and from about 40 to about 50% by weight of an isomeric mixture of diphenylmethane diisocyanate (MDI). The isomeric mixture of MDI is made up of from about 4 to about 30% by weight of the 2,4'-isomer and from about 70 to about 96% by weight of the 4,4'-isomer. The binders of the present invention are advantageous in that they may be used in high moisture, low temperature conditions without a catalyst. Reduced MDI emissions are also achieved when the binders of the present invention are used to make composite materials.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: February 8, 2000
    Assignee: Bayer Corporation
    Inventors: Karl W. Haider, John W. Frink, Heber D. Layton, Peter H. Markusch, James W. Rosthauser, Bonnie L. Lawson, Michael A. Joseph