Patents by Inventor Günter Sackmann

Günter Sackmann 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 the continuous production of superabsorbent polymers from PAN emulsions
    Patent number: 6590040
    Abstract: A process for producing a superabsorbent polymer is described. The process that entails a continuous hydrolysis of an aqueous emulsion of crosslinked or uncrosslinked polyacrylonitrile in the form of fine particles is carried out in a cascade of stirred tanks. The reaction with alkali-hydroxide solution an aqueous-alcoholic medium at 60 to 100° C. yields polymers that are suitable for the preparation of hygiene products, water-storing materials in agriculture, and sheathing of electrical cables.
    Type: Grant
    Filed: June 11, 2001
    Date of Patent: July 8, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Günter Sackmann, Rolf-Volker Meyer, Sergei Schapowalow, Telman Bayburdov, Jgor Nakonetschny
  • Process for the preparation of superabsorbent polymers from polyacrylonitrile precipitation polymers
    Patent number: 6573358
    Abstract: A process for the preparation of superabsorbers is disclosed. The process entails subjecting a polyacrylonitrile precipitation polymer alkaline hydrolysis to obtain a hydrolysis product. The hydrolysate that may optionally be neutralized is dried and ground and optionally modified by crosslinking of its surface. The inventive superabsorber is suitable for the preparation of nappies, incontinence articles, water-storage materials and electric cable coverings.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: June 3, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Gisbert Michels, Günter Sackmann, Klaus Struss
  • 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
  • Imparting water-repellency with polysiloxanes containing carboxyl groups
    Patent number: 6379751
    Abstract: The invention relates to polysiloxanes containing carboxyl groups that are useful for imparting water-repellency to substrates, a process for their preparation, a water-repellent system containing such polysiloxanes, and a process for the production of hydrophobic substrates.
    Type: Grant
    Filed: December 11, 2000
    Date of Patent: April 30, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Walter Schäfer, Günter Sackmann, Jürgen Reiners, Tillmann Hassel, Manfred Schnee, Fritz Novotny
  • Whitened polymers and the use thereof in coating slips for coating substrates
    Patent number: 6339117
    Abstract: The present invention relates to polymers whitened with optical brighteners obtained by (a) emulsion polymerization of acrylonitrile with or without a comonomer in the presence or absence of a graftable substrate, and (b) addition of an optical brightener before, during, or after the emulsion polymerization.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: January 15, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Udo Eckstein, Siegfried Korte, Ulrich Feldhues, Hans-Peter Geiger, Bernhard Hunke, Thomas Roick, Günter Sackmann
  • 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
  • Modified superabsorbent polymer based on polyacrylonitrile emulsions
    Patent number: 6288158
    Abstract: A process for modifying superabsorbent polymers is disclosed. The surface of a polymer containing hydrolyzed polyacrylonitrile in the form of particulates, is modified by crosslinking in a water/alcohol reaction mixture and in the presence of silica. The resulting product features improved absorbency under load and lesser degree of gel blocking.
    Type: Grant
    Filed: February 9, 1999
    Date of Patent: September 11, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Sergej Schapowalov, Günter Sackmann, Rolf-Volker Meyer, Siegfried Korte