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).
-
Patent number: 9321893Abstract: The present invention relates to a process for the production of radiation-cured foams, characterized in that the radiation-cured foams are produced by 1) foaming of an aqueous composition A), 2) thermal drying of the foam produced from step 1), 3) curing of the foam by actinic radiation, the radiation-curable aqueous compositions A), the radiation-cured foams produced by the process according to the invention and the use of the radiation-cured foams for coating substrates.Type: GrantFiled: March 4, 2011Date of Patent: April 26, 2016Assignee: Covestro Deutschland AGInventors: Stefan Sommer, Jan Weikard, Holger Casselmann, Thomas Michaelis, Erhard Lühmann
-
Publication number: 20120329895Abstract: The present invention relates to a process for the production of radiation-cured foams, characterized in that the radiation-cured foams are produced by 1) foaming of an aqueous composition A), 2) thermal drying of the foam produced from step 1), 3) curing of the foam by actinic radiation, the radiation-curable aqueous compositions A), the radiation-cured foams produced by the process according to the invention and the use of the radiation-cured foams for coating substrates.Type: ApplicationFiled: March 4, 2011Publication date: December 27, 2012Applicant: Bayer Intellectual Property GmbHInventors: Stefan Sommer, Jan Weikard, Holger Casselmann, Thomas Michaelis, Erhard Lühmann
-
Publication number: 20060240264Abstract: 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: ApplicationFiled: April 20, 2006Publication date: October 26, 2006Inventors: Rolf Gertzmann, Erhard Luhmann, Richard Kopp
-
Patent number: 6960639Abstract: 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: GrantFiled: June 10, 2003Date of Patent: November 1, 2005Assignee: Bayer AktiengesellschaftInventors: Jan Weikard, Erhard Lühmann, Christoph Irle, Thorsten Rische, Karin Naujoks, Thomas Feller, Jan Mazanek
-
Publication number: 20040195731Abstract: 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: ApplicationFiled: June 10, 2003Publication date: October 7, 2004Inventors: Thorsten Rische, Jan Weikard, Thomas Feller, Erhard Luhmann, Karin Naujoks
-
Patent number: 6710120Abstract: 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: GrantFiled: March 31, 2003Date of Patent: March 23, 2004Assignee: Bayer AktiengesellschaftInventors: Rolf Gertzmann, Christoph Irle, Jan Weikard, Rolf Roschu, Erhard Lühmann
-
Publication number: 20040006152Abstract: 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: ApplicationFiled: June 10, 2003Publication date: January 8, 2004Inventors: Jan Weikard, Erhard Luhmann, Christoph Irle, Thorsten Rische, Karin Naujoks, Thomas Feller, Jan Mazanek
-
Publication number: 20030191273Abstract: 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: ApplicationFiled: March 31, 2003Publication date: October 9, 2003Inventors: Rolf Gertzmann, Christoph Irle, Jan Weikard, Rolf Roschu, Erhard Luhmann
-
Patent number: 6583215Abstract: 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: GrantFiled: August 30, 2001Date of Patent: June 24, 2003Assignee: Bayer AktiengesellschaftInventors: Joachim Probst, Erhard Lühmann, Horst Clemens, Wolfgang Kremer, Jürgen Meixner, Hans-Josef Laas
-
Patent number: 6541536Abstract: 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: GrantFiled: March 27, 2001Date of Patent: April 1, 2003Assignee: Bayer AktiengesellschaftInventors: Jan Weikard, Erhard Lühmann, Wolfgang Kremer, Jürgen Meixner
-
Patent number: 6521702Abstract: The present invention relates to a radiation-curable, aqueous polyurethane emulsion which is prepared by I) reacting A) 40 to 90 wt. % of an isocyanate-reactive component that contains a polyester acrylate containing hydroxyl groups and having an OH content of 40 to 200 mg KOH/g and optionally other isocyanate-reactive compounds other than B) and B) 0.5 to 20 wt. % of one or more monofunctional and/or difunctional isocyanate-reactive compounds that contain cationic or anionic groups, potential cationic or anionic or hydrophilic ether groups, with C) 10 to 50 wt. % of one or more diisocyanates and/or polyisocyanates, II) optionally converting any potential cationic or anionic groups into cationic or anionic groups by salt formation and III) forming a dispersion of the reaction product of A), B) and C) in water and reacting it with D) 0.1 to 10 wt. % of one or more diamines and/or polyamines, wherein the wt.Type: GrantFiled: November 20, 2000Date of Patent: February 18, 2003Assignee: Bayer AktiengesellschaftInventors: Jan Weikard, Erhard Lühmann, Dieter Erdmann, Wolfgang Fischer, Wolfgang Kremer
-
Publication number: 20020143101Abstract: 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: ApplicationFiled: August 30, 2001Publication date: October 3, 2002Inventors: Joachim Probst, Erhard Luhmann, Horst Clemens, Wolfgang Kremer, Jurgen Meixner, Hans-Josef Laas
-
Patent number: 6420478Abstract: The present invention relates to a binder composition containing A) 70 to 99% of a polyurethane dispersion having an OH number of <10 mg KOH/g of solid resin and B) 1 to 30% of a water-dispersible polyisocyanate mixture prepared from an aliphatic, cycloaliphatic, araliphatic and/or aromatic diisocyanate, wherein the polyisocyanate mixture has a) an average isocyanate functionality of at least 2.0, b) a content of isocyanate groups (calculated as NCO; molecular weight 42) of 5.0 to 25.0 wt. %, and c) a content of ethylene oxide units of 2 to 50 wt. % (calculated as C2H4O; molecular weight 44) present within polyether chains containing an average of 5 to 35 ethylene oxide units, wherein at least 60 mole % of the polyether chains are connected via allophanate groups to two polyisocyanate molecules which are each prepared from at least two diisocyanate molecules and wherein the solids contents of components A) and B) add up to 100%.Type: GrantFiled: June 23, 2000Date of Patent: July 16, 2002Assignee: Bayer AktiengesellschaftInventors: Christoph Irle, Hans-Josef Laas, Wolfgang Kremer, Rolf Roschu, Erhard Lühmann
-
Publication number: 20010038918Abstract: 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: ApplicationFiled: March 27, 2001Publication date: November 8, 2001Inventors: Jan Weikard, Erhard Luhmann, Wolfgang Kremer, Jurgen Meixner
-
Patent number: 6274653Abstract: A plasticized composition comprising 40 to 82 percent cellulose nitrate, having nitrogen content of less than 12.6% relative to the weight of said cellulose nitrate, and 18 to 60 percent formylated polyurethane, said percent, both occurrences, being relative to the weight of the composition, is disclosed. The plasticized composition is suitable for use in preparing paints.Type: GrantFiled: September 7, 1999Date of Patent: August 14, 2001Assignee: Wolff Walsrode AGInventors: Reinhold Hecht, Lutz Hoppe, Erhard Lühmann
-
Patent number: 6197874Abstract: The present invention relates to polyurethane-polyacrylate hybrid dispersions comprising A) 20 to 99% by weight, based on resin solids, of a polyurethane wherein i) the polyurethane is rendered hydrophilic by ionic and/or nonionic hydrophilic groups and ii) the polyisocyanate component used to prepare the polyurethane contains an aliphatic or cycloaliphatic polyisocyanate containing allophanate groups, and B) 1 to 80% by weight, based on resin solids) of a polyacrylate polymer, wherein the sum of components A and B is 100%, based on the total weight of A) and B). The present invention also relates to the use of these hybrid dispersions for coating substrates, in particular wood.Type: GrantFiled: January 21, 1999Date of Patent: March 6, 2001Assignee: Bayer AktiengesellschaftInventors: Christoph Irle, Harald Blum, Martin Brahm, Wolfgang Kremer, Rolf Roschu, Erhard Lühmann, Josef Pedain, Christian Wamprecht
-
Patent number: 5711793Abstract: 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: GrantFiled: December 4, 1996Date of Patent: January 27, 1998Assignee: Wolff Walsrode AGInventors: Wolfgang Dannhorn, Lutz Hoppe, Erhard Luhmann, Hans-Jurgen Juhl
-
Patent number: 5684081Abstract: 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: GrantFiled: July 9, 1996Date of Patent: November 4, 1997Assignee: Wolff Walsrode AGInventors: Wolfgang Dannhorn, Reinhold Hecht, Lutz Hoppe, Erhard Luhmann
-
Patent number: 5565504Abstract: 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: GrantFiled: May 23, 1995Date of Patent: October 15, 1996Assignee: Wolff Walsrode AktiengesellschaftInventors: Wolfgang Dannhorn, Lutz Hoppe, Erhard Luhmann, Hans-Jurgen Juhl
-
Patent number: 5510453Abstract: The invention relates to novel branched polyesters containing allyl groups, which polyesters are water-emulsifiable, and their use as raw materials for lacquers.Type: GrantFiled: April 7, 1995Date of Patent: April 23, 1996Assignee: Wolff Walsrode AktiengesellschaftInventors: Burkhard Kressdorf, Erhard Luhmann, Wolfgang Dannhorn, Lutz Hoppe