Patents by Inventor Klaus Haefner

Klaus Haefner 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 polyvinylacetals with low solution viscosity
    Patent number: 6211289
    Abstract: Modified polyvinyl acetals are prepared by saponification of 1-alkylvinyl acetate-vinyl acetate copolymers, which contain 1-alkylvinyl acetate/vinyl acetate in a weight ratio of 1/99-40/60 and subsequent acetalization the saponification products containing at least 80% units of vinyl alcohol and 1-alkyl vinyl alcohol with one or more aliphatic aldehydes with 1-6 C atoms under acid catalysis in an aqueous and/or organic medium; as well as to a method for the manufacture and the use thereof, especially in printing inks.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: April 3, 2001
    Assignee: Wacker Chemie GmbH
    Inventors: Peter Tschirner, Peter Heiling, Otto-Sebastian Huber, Guenter Braunsperger, Klaus Haefner, Georg Friedl