Patents by Inventor Andrianus Hendrick Hofman

Andrianus Hendrick Hofman 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 removing hydrogenation catalyst residue from hydrogenated polymers
    Patent number: 6800725
    Abstract: This invention relates to a process for removing hydrogenation catalyst residue from hydrogenated polymers comprising: (I) treating a polymer cement comprising an unsaturated polymer in an inert water-immiscible liquid with a hydrogen source in the presence of a hydrogenation catalyst; (II) contacting the polymer cement of step (I) with one or more aqueous solution(s) of a weak acid having a pKa greater than 1.5 (determined in water at 25° C.); (III) contacting the polymer cement of step (II) with one or more aqueous solution(s) of a weak base having a pKa smaller than 10.5; and (IV) separating the hydrogenated polymer.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: October 5, 2004
    Assignee: KRATON Polymers U.S. LLC
    Inventors: Andrianus Hendrick Hofman, Heleen Johanna Augusta De Smet, Alan Villena, Anne Genevieve Charlotte Wirtz