Patents by Inventor Wolf-Stefan Schultz

Wolf-Stefan Schultz 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).

  • Invert size for the internal and surface sizing of paper
    Patent number: 4983257
    Abstract: An invert size for the engine and tub sizing of paper. It contains an aqueous dispersion of a fortified, unfortified, hydrogenated, or disproportionated and optionally esterified rosin or mixture of such rosins and of a dispersant that contains digested casein or an emulsifier of the general formula[R--(OCH.sub.2 CH.sub.2).sub.n --O--A].sub.x.sup.- M.sup.X+(I)wherein R is an alkylphenyl, alkyl, or alkenyl group or a cycloalkyl group with condensed rings, A is a group with the formula --CH.sub.2 COO or --SO.sub.3, M.sup.x+ is a cation, x is 1 or 2, and n is a number such that approximately 21 to 76% of the molecular weight of the anion is in the --OCH.sub.2 CH.sub.2 group. To allow sizing control, the dispersant also contains cationic starch.
    Type: Grant
    Filed: January 9, 1989
    Date of Patent: January 8, 1991
    Assignee: Klebstofwerke Collodin Dr. Schultz & Nauth GMBH
    Inventors: Wolf-Stefan Schultz, Uwe Beyer