Patents by Inventor Erhard Luhmann

Erhard Luhmann 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).

  • Publication number: 20060240264
    Abstract: The present invention relates to aqueous polyurethane dispersions that are free from N-methylpyrrolidone and other solvents and wherein the polyurethanes are the reaction products of A) a mixture of 25% to 90% by weight of 1-isocyanate-3,3,5,-trimethyl-5-isocyanatomethylcyclohexane (IPDI) and 10% to 75% by weight of 4,4?-diisocyanatodicyclohexylmethane, wherein the preceding percentages are based on the weight of component A), with B) one or more polyols having average molarcular weights (Mn) of 500 to 6000, C) one or more compounds which have at least one OH— or NH-functional group and contain a carboxyl and/or carboxylate group, wherein at least 50 mol % of the acid groups, based on the total moles of acid incorporated into the polyurethane, are incorporated by dimethylolpropionic acid, D) one or more polyols and/or polyamines having average molecular weights (Mn) of below 500, and E) optionally one or more monoalcohols and/or monoamines.
    Type: Application
    Filed: April 20, 2006
    Publication date: October 26, 2006
    Inventors: Rolf Gertzmann, Erhard Luhmann, Richard Kopp
  • Publication number: 20040195731
    Abstract: A process for preparing glass fiber reinforced plastics using high-energy radiation. A sizing composition is applied to the glass fiber, and the curing mechanism of the sizing composition proceeds in a controlled way by the use of two crosslinking mechanisms which can be activated separately from one another. Aqueous UV-curing polyurethane dispersions containing few or no active hydrogen atoms are used in combination with water-dispersible or water-soluble blocked polyisocyanates.
    Type: Application
    Filed: June 10, 2003
    Publication date: October 7, 2004
    Inventors: Thorsten Rische, Jan Weikard, Thomas Feller, Erhard Luhmann, Karin Naujoks
  • Publication number: 20040006152
    Abstract: Aqueous coating compositions based on polyurethane dispersions which cure under the influence of high-energy radiation, to a process for preparing them and to their use. The coating compositions contain a polyisocyanate, a polyurethane containing free-radically polymerizable groups, and an initiator which is capable of initiating a free-radical polymerization.
    Type: Application
    Filed: June 10, 2003
    Publication date: January 8, 2004
    Inventors: Jan Weikard, Erhard Luhmann, Christoph Irle, Thorsten Rische, Karin Naujoks, Thomas Feller, Jan Mazanek
  • Publication number: 20030191273
    Abstract: The invention relates to aqueous polyurethane dispersions based on fatty acid dialkanolamides, to a process for preparing them and to use as coating compositions.
    Type: Application
    Filed: March 31, 2003
    Publication date: October 9, 2003
    Inventors: Rolf Gertzmann, Christoph Irle, Jan Weikard, Rolf Roschu, Erhard Luhmann
  • Publication number: 20020143101
    Abstract: The invention relates to an aqueous 2-component polyurethane (PU) coating composition comprising a vinyl polymer polyol dispersion, having a hydroxyl number between 10 and 264 mg KOH/g solid resin, an acid value (calculated from the sum of neutralized and non-neutralized acid groups) between 0 and 55 mg KOH/g solid resin, a number-average molecular weight Mn of at least 5000 g/mol and a weight average molecular weight Mw of at least 30,000 g/mol, a glass transition temperature of at least 20° C. and an average particle diameter of no greater than 300 nm, which is prepared in the presence of 0.1 to 10.0 wt. %, relative to the sum of the solids contents of polymer polyol and polyisocyanate, of a non-ionic polyether surfactant and a polyisocyanate having a viscosity at 23° C. of no more than 12,000 mPa*s and either a non-hydrophilic or a non-ionically or anionically hydrophilic character, whereby the equivalent ratio of isocyanate groups of component b) to hydroxyl groups of component a) is 0.
    Type: Application
    Filed: August 30, 2001
    Publication date: October 3, 2002
    Inventors: Joachim Probst, Erhard Luhmann, Horst Clemens, Wolfgang Kremer, Jurgen Meixner, Hans-Josef Laas
  • Publication number: 20010038918
    Abstract: The present invention relates to radiation curable aqueous polyurethane dispersions containing 0.05 to 20 wt. %, based on the weight of the non-aqueous constituents of the aqueous polyurethane dispersions, of 2,2-dimethyl-3-hydroxypropionic acid-(2,2-dimethyl-3-hydroxypropyl ester), (HPSNPG, calculated as MW 204.3). The invention also relates to substrates coated with these polyurethane dispersions, in particular to coated wood substrates with good grain enhancing properties.
    Type: Application
    Filed: March 27, 2001
    Publication date: November 8, 2001
    Inventors: Jan Weikard, Erhard Luhmann, Wolfgang Kremer, Jurgen Meixner
  • Patent number: 5711793
    Abstract: Lacquer vehicles in granular form, wherein the lacquer vehicles in granular form are composed of 10-82 weight % cellulose ester and 18-90 weight % resin and/or plasticizer as an explosive stabilizer.
    Type: Grant
    Filed: December 4, 1996
    Date of Patent: January 27, 1998
    Assignee: Wolff Walsrode AG
    Inventors: Wolfgang Dannhorn, Lutz Hoppe, Erhard Luhmann, Hans-Jurgen Juhl
  • Patent number: 5684081
    Abstract: The present invention relates to polyester acrylate/urethane dispersions based on polyester acrylate prepolymers containing hydroxyl groups, obtainable by polyaddition ofA. 40-90 wt. % of one or more polyester acrylate prepolymers containing hydroxyl groups and having an OH content of 40-120 mg of KOH/g andB. 0.1-20 wt. % of one or more mono- and/or difunctional compounds reactive towards isocyanate groups, which compounds contain groups which are cationic, artionic and/or have a dispersant action due to ether groups withC. 10-50 wt. % of one or more polyisocyanatesD. 0.0-30 wt. % of polyolstogether with a subsequent reaction withE. 0.1-10 wt. % of one or more di- and/or polyamines.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: November 4, 1997
    Assignee: Wolff Walsrode AG
    Inventors: Wolfgang Dannhorn, Reinhold Hecht, Lutz Hoppe, Erhard Luhmann
  • Patent number: 5565504
    Abstract: The present Application relates to an aqueous, reactive microgel dispersion, wherein the microgel particles have an average particle diameter of 0.01 to 1 .mu.m, are insoluble but are capable of swelling in the usual organic solvents, dry without additional film-forming agents to form uniform, transparent, reactive films, and have iodine numbers of 2 to 100.
    Type: Grant
    Filed: May 23, 1995
    Date of Patent: October 15, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Wolfgang Dannhorn, Lutz Hoppe, Erhard Luhmann, Hans-Jurgen Juhl
  • Patent number: 5510453
    Abstract: The invention relates to novel branched polyesters containing allyl groups, which polyesters are water-emulsifiable, and their use as raw materials for lacquers.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: April 23, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Wolfgang Dannhorn, Lutz Hoppe
  • Patent number: 5484826
    Abstract: The invention relates to free-flowing, quick-dissolving lacquer binder granules based on cellulose esters, more particularly cellulose nitrates, and to a process for their production.
    Type: Grant
    Filed: November 28, 1994
    Date of Patent: January 16, 1996
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Lutz Hoppe
  • Patent number: 5459196
    Abstract: This invention relates to new water-emulsifiable polyester resins, a process for their production and their use as a lacquer row material. These lacquer binders are produced by the reaction of at least one prepolymer A which contains (meth)acryloyl groups and at least one unsaturated water-emulsifiable polyester B with at least one polyisocynate C.
    Type: Grant
    Filed: June 10, 1993
    Date of Patent: October 17, 1995
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Burkhard Kressdorf, Wolfgang Dannhorn, Erhard Luhmann, Lutz Hoppe
  • Patent number: 5362313
    Abstract: This invention relates to a new solid lacquer binder comprising gelatinized nitrocellulose, useful for the preparation of blocking-resistant coating compositions comprising epoxidized natural fatty acids of epoxidized triglycerides.
    Type: Grant
    Filed: November 15, 1993
    Date of Patent: November 8, 1994
    Assignee: Wolff Walsrode AG
    Inventors: Lutz Hoppe, Burkhard Kressdorf, Erhard Luhmann, Reinhard Nader
  • Patent number: 5352730
    Abstract: The present invention relates to a coating compound for sheets, films, or molded products composed of modified or unmodified polysaccharides.
    Type: Grant
    Filed: June 5, 1992
    Date of Patent: October 4, 1994
    Assignee: Wolff Walstrode AG
    Inventors: Erhard Luhmann, Burkhard Kressdorf, Lutz Hoppe, Klaus Szablikowski, Gunter Weber, Sebastian Meyer-Stork
  • Patent number: 5274067
    Abstract: Unsaturated polyester polyurethanes based on an allyl-ether-modified polyester A and a polyisocyanate B are suitable for paints having improved hardness and appearance.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: December 28, 1993
    Assignee: Wolff Walsrode AG
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Lutz Hoppe, Wolfgang Koch, Klaus Szablikowski
  • Patent number: 5102976
    Abstract: Improved .alpha.,.beta.-unsaturated polyesters for paint applications are based on an unsaturated polycarboxylic acid, a polyalkylene glycol having an average molecular weight of 300 to 1,000 and an alkoxylated triol containing no unsaturated groups.
    Type: Grant
    Filed: March 29, 1991
    Date of Patent: April 7, 1992
    Assignee: Wolff Walsrode AG
    Inventors: Burkhard Kressdorf, Erhard Luhmann, Lutz Hoppe
  • Patent number: 5089586
    Abstract: Improved water-dispersible allyl urethanes are obtainable by reaction of a polyglycol mixture with a hydroxyallyl compound and an isocyanate containing at least two NCO groups, the allyl urethane being nonionic.
    Type: Grant
    Filed: August 16, 1989
    Date of Patent: February 18, 1992
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Michael Piepho, Lutz Hoppe, Erhard Luhmann
  • Patent number: 5011874
    Abstract: Improved cellulose ester-polymer combinations contain a cellulose ester A and at least one polymerized monomer B of the following formula ##STR1## wherein the substituents have the meaning given in the description and wherein the particles of the combinations are essentially 0.1 to 10 mm in size.
    Type: Grant
    Filed: October 10, 1989
    Date of Patent: April 30, 1991
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Lutz Hoppe, Wolfgang Koch, Erhard Luhmann, Michael Piepho
  • Patent number: 4970247
    Abstract: Improved cellulose ester dispersions in the aqueous phase contain dispersed particles which contain cellulose esters, a polymerized monomer A having a polymerizable double bond and a polymerized monomer B having at least two polymerizable double bonds.
    Type: Grant
    Filed: March 13, 1989
    Date of Patent: November 13, 1990
    Assignee: Wolff Walsrode Aktiengesellschaft
    Inventors: Lutz Hoppe, Wolfgang Koch, Erhard Luhmann, Michael Piepho
  • Patent number: 4933428
    Abstract: Water soluble, polymerizable binders suitable for surface coating contain co-condensed residues of at least two polyalkylene glycols with different molecular weights, an alkoxylated polyol, a polycarboxylic acid and an optionally substituted acrylic acid.
    Type: Grant
    Filed: December 12, 1988
    Date of Patent: June 12, 1990
    Assignee: Wolff Walsrode AG
    Inventors: Michael Piepho, Erhard Luhmann, Lutz Hoppe, Klaus Szablikowski