Patents by Inventor Nina Hassel

Nina Hassel 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 producing a polyurethane prepolymer
    Publication number: 20060004175
    Abstract: A method for producing a polyurethane prepolymer having terminal isocyanate groups is provided wherein one or more polyisocyanates are reacted with one or more polyols and wherein at least one asymmetric diisocyanate, at least one polyol having an average molecular weight (Mn) of 60 to 3000 g/mol, and at least one carboxamide catalyst are used. The ratio of isocyanate groups to hydroxyl groups is set in the range between 1.1:1 to 4:1.
    Type: Application
    Filed: June 8, 2005
    Publication date: January 5, 2006
    Inventors: Guido Kollbach, Nina Hassel, Hans-Georg Kinzelmann, Oliver Steil, Heike Hupfer-Bolte
  • Method for producing polyurethane prepolymer having a low content of monomers
    Publication number: 20050020706
    Abstract: This invention describes a process for the production of isocyanate-terminated polyurethane prepolymers by reacting polyisocyanates in stages with polyols and to their use.
    Type: Application
    Filed: June 18, 2004
    Publication date: January 27, 2005
    Inventors: Guido Kollbach, Gerd Bolte, Nina Hassel, Heike Hupfer-Bolte