Patents Assigned to Wolff Walsrode AG
  • Water-soluble polymers and their use as auxiliaries for building materials
    Patent number: 4703087
    Abstract: New water-soluble copolymers based on acrylic acid derivatives and their use as auxiliaries for building materials.
    Type: Grant
    Filed: December 16, 1986
    Date of Patent: October 27, 1987
    Assignee: Wolff Walsrode AG
    Inventors: Werner Lange, Frank Hohl, Klaus Szablikowski
  • Internal dusting of film tubes composed of thermoplastics
    Patent number: 4659532
    Abstract: A process for providing film tubes with anti-blocking means in that the film tube is cooled internally by an aqueous suspension containing a suspended release agent directly after extrusion, the excess suspensions are sucked from the interior and the tube, which is additionally cooled on the exterior in a water bath, is freed of remaining liquid by squeezing rollers.
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: April 21, 1987
    Assignee: Wolff Walsrode AG
    Inventor: Wolfgang Renger
  • Nitrocellulose moistened with tertiary alcohols and the use thereof in polyurethane lacquers
    Patent number: 4659387
    Abstract: Nitrocellulose moistened with alcohol, particularly for polyurethane lacquers, characterized in that a lower aliphatic tertiary alcohol is used as moistening agent.
    Type: Grant
    Filed: July 30, 1985
    Date of Patent: April 21, 1987
    Assignee: Wolff Walsrode AG
    Inventors: Erhard Luhmann, Lutz Hoppe
  • Water-soluble, polymer-modified hydroxyalkyl methyl cellulose and its use as an additive for asbestos-free tile adhesive formulations
    Patent number: 4588772
    Abstract: Water-soluble substances of high molecular weight obtained by reacting hydroxyalkyl methyl celluloses with copolymers of 2-acrylamido-2-methyl-3-propane sulfonic acid/acrylamide/ethylacrylate and a bifunctional crosslinking component in an alkaline medium.
    Type: Grant
    Filed: October 26, 1984
    Date of Patent: May 13, 1986
    Assignee: Wolff Walsrode AG
    Inventors: Branislav Bohmer, Werner Lange, Frank Hohl
  • Purification of cellulose and starch ethers with counter current washing
    Patent number: 4404370
    Abstract: A process for the purification and isolation of cellulose or starch ethers wherein directly after the etherification step the suspension agent and the extraction of the ether product with the purifying agent is carried out on the same continuously working filter.
    Type: Grant
    Filed: November 23, 1980
    Date of Patent: September 13, 1983
    Assignee: Wolff Walsrode AG and Bayer AG
    Inventors: Claus-Rudiger Bernert, Volker Hartwig, Christian Kords, Detmar Redeker
  • Process for the production of water-soluble hydrolyzed products of polyacrylonitrile polymers
    Patent number: 4357437
    Abstract: A process for the production of water-soluble hydrolyzed polyacrylonitrile polymers, wherein the acrylonitrile is polymerized in the presence of 1-8% by weight of hydrolyzed polyacrylonitrile and hydrolyzed without intermediate isolation from the reaction mixture.
    Type: Grant
    Filed: July 23, 1981
    Date of Patent: November 2, 1982
    Assignee: Wolff Walsrode AG
    Inventors: Helmut Huhn, Werner Karstens, Lutz Hoppe
  • Fibre-reinforced metallic luster pigmented tubular casing and a process for its production
    Patent number: 4336828
    Abstract: Fibre-reinforced metallic pearlescent luster flake pigmented tubular casing with a seamless coating on its inside of a vinylidene halide copolymer lacquer, wherein the copper-, silver- or gold-colored pigment is embedded in a film forming impregnating agent in dispersed form; and a suitable process for the production of such fibre-reinforced pigmented casing.
    Type: Grant
    Filed: July 9, 1980
    Date of Patent: June 29, 1982
    Assignee: Wolff Walsrode AG
    Inventors: Klaus Balser, Walter Beger
  • Water soluble copolyamide from (1) polyalkylene polyamine, (2) dicarboxylic acid, (3) diamine or lactam or amino acid and (4) epichlorohydrin
    Patent number: 3945983
    Abstract: A process for the production of an anchoring agent of copolyamide resin by condensing certain amounts of polyalkylene polyamines, dicarboxylic acids and at least one member of the group consisting of diamine, .epsilon.-caprolactam and amino caproic acid, and then reacting the secondary amino groups of said copolyamide partially with epichlorhydrin for crosslinking.
    Type: Grant
    Filed: February 26, 1973
    Date of Patent: March 23, 1976
    Assignee: Wolff Walsrode AG
    Inventors: Lutz Hoppe, Rudolf Behn