Patents by Inventor Johan Kijlstra

Johan Kijlstra 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).

  • Fine-particle polymer dispersions for paper sizing
    Patent number: 6426381
    Abstract: This invention relates to aqueous polymer dispersions obtained by free radical emulsion copolymerization of ethylenically unsaturated monomers comprising (a) 30 to 60% by weight of at least one optionally substituted styrene, (b) 60 to 30% by weight of at least one C1-C4-alkyl (meth)acrylate, and (c) 0 to 10% by weight of other ethylenically unsaturated copolymerizable monomers, in the presence of (d) 10 to 40% by weight of degraded starch having a molecular weight Mn of 500 to 10,000, and (e) a graft-linking, water-soluble redox system as free radical initiator for the free radical emulsion copolymerization, wherein the sum (a)+(b)+(c)+(d) is 100%.
    Type: Grant
    Filed: August 11, 2000
    Date of Patent: July 30, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Joachim König, Eckhard Wenz, Günter Sackmann, Thomas Roick, Bernd Thiele, Gabriele Kinkel, Johan Kijlstra, Bernd Hauschel
  • Cationic polymer dispersions for paper sizing
    Publication number: 20020040088
    Abstract: The present invention relates to cationic aqueous polymer dispersions comprising small particles, the cationic aqueous polymer dispersions are used for internal sizing and surface sizing of paper, board and cardboard.
    Type: Application
    Filed: August 14, 2001
    Publication date: April 4, 2002
    Inventors: Bernd Hauschel, Vera Buchholz, Bernd Thiele, Johan Kijlstra
  • Sizing agents for paper
    Patent number: 6310132
    Abstract: This invention relates to novel aqueous emulsion polymers obtained by free-radical initiated addition polymerization of at least one monomer in the presence of degraded starch and at least one polymeric emulsifier from the series of sulfo-containing maleic anhydride copolymers and/or sulfo-containing oligourethanes with a branched molecular structure. The invention further relates the use of such emulsion polymers as surface sizing agents for paper and paperlike materials.
    Type: Grant
    Filed: December 15, 1998
    Date of Patent: October 30, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Sackmann, Eckhard Wenz, Joachim König, Bernhard Jansen, Thomas Roick, Bernd Thiele, Johan Kijlstra
  • Water dispersable, isocyanates with enhanced absorbing capacity as paper auxiliary agents
    Patent number: 6201060
    Abstract: The present invention relates to water-dispersible polyisocyanates obtained by reacting a) at least one polyisocyanate, b) at least one polyalkylene oxide polyether alcohol optionally containing ester groups, c) at least one quatemized tertiary aminopolyethylene oxide polyether alcohol, and d) optionally, further auxiliaries and additives.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: March 13, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Bernhard Jansen, Bernd Thiele, Thomas Roick, Johan Kijlstra
  • Magnetorheological liquids, a process for producing them and their use, and a process for producing magnetizable particles coated with an organic polymer
    Patent number: 5989447
    Abstract: Magnetorheological liquids, a process for producing them, their use and a process for producing polymer-coated magnetisable particles used in the magnetorheological liquids.
    Type: Grant
    Filed: November 24, 1997
    Date of Patent: November 23, 1999
    Assignee: G E Bayer Silicones GmbH & Co. KG
    Inventors: Wolfgang Podszun, Olaf Halle, Johan Kijlstra, Robert Bloodworth, Eckhard Wendt
  • Pigment preparations for inkjet printing
    Patent number: 5969002
    Abstract: Pigment preparations comprisinga) 0.1 to 70% by weight of pigment,b) 10 to 99% by weight of water, each based on the preparation,c) 0.1 to 100 % by weight, based on pigment used as component a), of a water-soluble polyisocyanate addition product, said polyisocyanate addition product having hydrophilic polyether chains and an isocyanate group content of not more than 1.0% by weight, containing 30 to 95% by weight of ethylene oxide units (molecular weight=44 g/mol) arranged within polyether chains and incorporated via monofunctional alcohols B), having an ionic group content of 0 to 200 milliequivalents/100 g of polyisocyanate addition product, and having been prepared by reaction of component A to E, the meaning of which is specified in the descriptive part,are highly useful as printing inks for inkjet printing.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: October 19, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Johan Kijlstra, Stephan Kirchmeyer, Peter-Roger Nyssen, Dirk Pfutzenreuter, Christian Wamprecht