Patents by Inventor Sonja E. Stammler

Sonja E. Stammler 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).

  • Stable aqueous polyurethane dispersions
    Patent number: 6017998
    Abstract: The present invention discloses a stable aqueous polyurethane dispersions comprising a reaction product of a water dispersible isocyanate-terminated polyurethane prepolymer (A), an aqueous polyurethane dispersion (B) and water, and a method wherein a water dispersible isocyanate-terminated polyurethane prepolymer (A) is dispersed in at least one aqueous polyurethane dispersion (B) and water, and reacted at about 35.degree. C. to about 95.degree. C. until substantially free of isocyanate. The inventive dispersions are useful in adhesives, coatings, binders, primers and sizers.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: January 25, 2000
    Assignee: H.B. Fuller Licensing & Financing,Inc.
    Inventors: Youlu Duan, Yi Wei, Yuduo Zhu, Sonja E. Stammler, Brian L. Marty, Gary J. Haider, Ronald R. Davies, Michael J. Maksymkiw
  • Aqueous polyurethane dispersions formed from polyisocyanates having a methylene bridge
    Patent number: 5900457
    Abstract: The present invention is directed to aqueous polyurethane dispersions and aqueous polyurethane-acrylic dispersions, especially polymer dispersions formed from norbornane diisocyanate. The dispersions, and the dried polymers therefrom, are useful adhesives that provide enhanced bond strength when subjected to increased thermal and mechanical stress. Additionally, the inventive dispersions form polymers having increased adhesion compared to similar polymers based on cycloaliphatic diisocyanates which are free of a methylene bridge.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: May 4, 1999
    Assignee: H.B. Fuller Licensing & Financing, Inc.
    Inventors: Youlu Duan, Douglas U. Gwost, Yi Wei, Yuduo Zhu, Sonja E. Stammler, Michael J. Maksymkiw