Patents by Inventor Volkmar Weberndoerfer

Volkmar Weberndoerfer 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).

  • Patent number: 4940514
    Abstract: Paper, board, and cardboard having high dry strength are made by adding to the paper stock a dry strength agent which is obtainable by mixing enzymatically digested starch having a viscosity of from 20 to 2,000 mPa.s (measured in 7.5% strength aqueous solution at C.) and a cationic polymer which contains, as typical copolymerized monomers,(a) diallyldimethylammonium chloride,(b) N-vinylamine or(c) an unsubstituted or substituted N-vinylimidazoline, the K value of the cationic polymer in each case being not less than 30, and draining the paper stock with sheet formation.
    Type: Grant
    Filed: July 25, 1988
    Date of Patent: July 10, 1990
    Assignee: BASF Aktiengesellschaft
    Inventors: Andreas Stange, Hans-Juergen Degen, Werner Auhorn, Volkmar Weberndoerfer, Michael Kroener, Heinrich Hartmann
  • Patent number: 4818341
    Abstract: Paper and paperboard of high dry strength are produced by adding a dry strength enhancer to the paper stock and dewatering the paper stock with sheet formation by using as the dry strength enhancer a mixture of a cationic polymer which contains as characteristic monomers copolymerized units of(a) diallyldimethylammonium chloride,(b) N-vinylamine or(c) a substituted or unsubstituted N-vinylimidazoline and has a K value of not less than 30, and natural potato starch which is converted into a water-soluble form by heating in an aqueous medium at above the gelatinization temperature of natural potato starch in the absence of any oxidizing agents or alkali.
    Type: Grant
    Filed: February 12, 1988
    Date of Patent: April 4, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans-Juergen Degen, Sigberg Pfohl, Volkmar Weberndoerfer, Gerd Rehmer, Michael Kroener, Andreas Stange
  • Patent number: 4784724
    Abstract: Paper having a high dry strength is made using water-soluble homopolymers of salts or quaternary 1-vinyl-2-imidazolines and copolymers of these salts or quaternary compounds with acrylamide and/or methacrylamide as agents for increasing the dry strength of paper.
    Type: Grant
    Filed: April 15, 1986
    Date of Patent: November 15, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Sigberg Pfohl, Volkmar Weberndoerfer, Heinrich Hartmann, Friedrich Linhart
  • Patent number: 4770743
    Abstract: Engine sizes for paper are based on aqueous emulsions of C.sub.14 -C.sub.20 -alkyl diketenes and cationic copolymers of(a) from 40 to 99% by weight of acrylamide and/or methacrylamide,(b) from 1 to 40% by weight of an unsubstituted or substituted N-vinylimidazoline and(c) from 0 to 30% by weight of an unsubstituted or substituted N-vinylimidazole.
    Type: Grant
    Filed: July 10, 1987
    Date of Patent: September 13, 1988
    Assignee: BASF Aktiengesellschaft
    Inventors: Volkmar Weberndoerfer, Enrique Freudenberg, Hans-Juergen Degen, Ulrich Riebeling
  • Patent number: 4560745
    Abstract: A process for the preparation of dyes which contain sulfonic acid groups and have a low electrolyte content, wherein an aqueous solution or suspension, which may or may not contain inorganic salts, of the dye containing sulfonic acid groups is(a) mixed with an amount, equivalent to the said dye, of a non-emulsifying, water-insoluble amine of a total of 12 to 40 carbon atoms, which forms, with the said dye, a salt which is sufficiently lipophilic for it to separate spontaneously from the aqueous phase,(b) the pH is brought to <5 with an acid and the batch is mixed thoroughly,(c) the two resulting phases of different density are separated, and(d) the phase which consists of the lipophilic ammonium salt of the dye is mixed, with or without prior washing with water, with a water-soluble base whose sulfonate salt is to be prepared, and with water, the resulting phases are separated, and the salt is left in the aqueous solution or is isolated therefrom.
    Type: Grant
    Filed: May 12, 1981
    Date of Patent: December 24, 1985
    Assignee: BASF Aktiengesellschaft
    Inventors: Volkmar Weberndoerfer, Friedrich Brunnmueller, Manfred Eisert, Rudolf Bermes
  • Patent number: 4252531
    Abstract: A process for dyeing textile materials, consisting of wool or nylon fibers, with anionic dyes in an aqueous liquor at up to C., wherein dyeing is commenced at a pH of from 7 to 9 and from 0.2 to 5 parts by weight, per 1,000 parts by weight of liquor, of an ester of a saturated C.sub.2 -C.sub.4 -carboxylic acid with an alcohol having a tertiary amino group in the 2-position are added at the dyeing temperature to act as a pH regulator.
    Type: Grant
    Filed: February 26, 1979
    Date of Patent: February 24, 1981
    Assignee: BASF Aktiengesellschaft
    Inventors: Manfred Daeuble, Volkmar Weberndoerfer, Hans G. Schulze
  • Patent number: 4242187
    Abstract: Alkanes substituted by chlorine atoms and/or sulfochloride groups are prepared by reacting alkanes with chlorine, with or without sulfur dioxide, in a particular throughput ratio, in a reaction chamber inclined to the horizontal, the starting materials being passed through the reaction chamber in co-current, from below. The substituted alkanes or paraffins obtainable by the process of the invention are pesticides, plasticizers, solvents and starting materials for the preparation of such products, as well as of fat liquors, detergents, lubricating oils, synthetic resins and slip agents.
    Type: Grant
    Filed: January 31, 1979
    Date of Patent: December 30, 1980
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Schlecht, Volkmar Weberndoerfer, Rudi Widder