Patents by Inventor Ansgar Schott

Ansgar Schott 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).

  • Process for the preparation of blocked polyisocyanates
    Patent number: 4258186
    Abstract: A process for the preparation of blocked polyisocyanates which comprises reacting a polyisocyanate with a cyclic amidine of the formula: ##STR1## wherein R are the same or different substituents selected from the group consisting of hydrogen, alkyl, cycloalkyl, aralkyl and aryl, and wherein either R' and R or two R' taken together form a cycloaliphatic ring, and wherein the reaction is carried out at temperatures of 0.degree.-150.degree. C. Polyisocyanates blocked with 6-membered ring bicyclic amidines.
    Type: Grant
    Filed: November 17, 1978
    Date of Patent: March 24, 1981
    Assignee: Chemisch Werke Huls AG
    Inventors: Ansgar Schott, Rainer Gras, Elmar Wolf