Patents by Inventor Eckehardt Witsuba

Eckehardt Witsuba 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).

  • Carboxyl-containing isobutene copolymers
    Patent number: 5473022
    Abstract: Carboxyl-containing isobutene copolymers are obtainablea) by cationic polymerization of a mixture of from 1 to 99 mol % of isobutene and from 99 to 1 mol % of a 2-methylalk-1-ene at less than 20.degree. C. in the presence of a halogen-containing Lewis acid andb) subsequent grafting of the isobutene copolymer obtainable in this manner with an .alpha.,.beta.-ethylenically unsaturated carboxylic acid or carboxylic acid derivative at above 100.degree. C. and in the presence of a free radical initiator.Such carboxyl-containing isobutene copolymers are particularly suitable as adhesive raw materials or as sealing compounds.
    Type: Grant
    Filed: September 2, 1994
    Date of Patent: December 5, 1995
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Deckers, Hans-Joachim Muller, Roger Klimesch, Eckehardt Witsuba, Heinz Plaumann, Erich Kolk, Gunther Isbarn, Karl-Heinz Fauth, Joachim Krobb