Patents by Inventor Michael Ludewig

Michael Ludewig 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: 11059934
    Abstract: The present invention relates to a process for producing (cyclo)aliphatic polycarbonate polyols comprising the steps of a) reaction of at least one (cyclo)aliphatic polyol and at least one alkyl carbonate in the presence of at least one basic catalyst and b) neutralization by addition of at least one organic sulfonic acid having a molecular weight of 250 to 1000 g/mol and at least one branched or unbranched alkyl substitution having at least four carbon atoms, wherein step b) is performed after step a).
    Type: Grant
    Filed: December 18, 2017
    Date of Patent: July 13, 2021
    Assignee: Covestro Deutschland AG
    Inventors: Michael Ludewig, Stefan Sommer, Holger Breuer, Michael Grahl
  • Patent number: 11007711
    Abstract: A process for manufacturing an object involves the steps of: I) depositing a radically cross-linked resin on a carrier so that a layer of a structuring material joined to the carrier is obtained, said layer corresponding to a first selected cross-section of the object; II) depositing a radically cross-linked resin on a previously applied layer of the structuring material so that an additional layer of the structuring material is obtained which corresponds to a further selected cross-section of the object and which is joined to the previously applied layer; III) repeating step II) until the object is formed, wherein the deposition of a radically cross-linked resin in steps I) and II) includes the application of a radically cross-linkable resin to the carrier or the previously applied layer and is performed at least in step II) by applying energy to a selected region of a radically cross-linkable resin, corresponding to the selected cross-section of the object, the radically cross-linkable resin having a viscos
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: May 18, 2021
    Assignee: Covestro Deutschland AG
    Inventors: Dirk Achten, Thomas Buesgen, Roland Wagner, Florian Stempfle, Michael Ludewig, Christoph Tomczyk
  • Publication number: 20210046696
    Abstract: A process for manufacturing an object involves the steps of: I) depositing a radically cross-linked resin on a carrier so that a layer of a structuring material joined to the carrier is obtained, said layer corresponding to a first selected cross-section of the object; II) depositing a radically cross-linked resin on a previously applied layer of the structuring material so that an additional layer of the structuring material is obtained which corresponds to a further selected cross-section of the object and which is joined to the previously applied layer; III) repeating step II) until the object is formed, wherein the deposition of a radically cross-linked resin in steps I) and II) includes the application of a radically cross-linkable resin to the carrier or the previously applied layer and is performed at least in step II) by applying energy to a selected region of a radically cross-linkable resin, corresponding to the selected cross-section of the object, the radically cross-linkable resin having a viscos
    Type: Application
    Filed: November 8, 2018
    Publication date: February 18, 2021
    Inventors: Dirk Achten, Thomas Buesgen, Roland Wagner, Florian Stempfle, Michael Ludewig, Christoph Tomczyk
  • Patent number: 10882942
    Abstract: The invention relates to storage-stable aqueous dispersions of hydrophilically modified polycarbodiimide resins, a method for producing same, and the use of a salt component to reduce carbodiimide hydrolysis in aqueous polycarbodiimide dispersions.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: January 5, 2021
    Assignee: Covestro Deutschland AG
    Inventors: Joerg Buechner, Michael Ludewig, Evgeny Avtomonov, Martin Melchiors
  • Publication number: 20200385508
    Abstract: The invention relates to storage-stable aqueous dispersions of hydrophilically modified polycarbodiimide resins, a method for producing same, and the use of a salt component to reduce carbodiimide hydrolysis in aqueous polycarbodiimide dispersions.
    Type: Application
    Filed: December 12, 2018
    Publication date: December 10, 2020
    Inventors: Joerg Buechner, Michael Ludewig, Evgeny Avtomonov, Martin Melchiors
  • Publication number: 20200198226
    Abstract: The invention relates to a method for producing an object, comprising the step of producing the object from a construction material by means of an additive manufacturing process, wherein the construction material comprising a polyurethane and/or polyester polyol. The construction material further comprises a polyamine component and during and/or after the production of the object, the construction material is heated to a temperature of ?50° C. The invention also relates to an object obtained according to the claimed method.
    Type: Application
    Filed: June 13, 2018
    Publication date: June 25, 2020
    Inventors: Dirk Achten, Thomas Buesgen, Christoph Eggert, Hans-Josef Laas, Florian Johannes Stempfle, Michael Ludewig
  • Publication number: 20200190245
    Abstract: The present invention relates to polymerizable compositions which contain components that can be crosslinked both via isocyanurate bonds and by a radical reaction mechanism. The invention further relates to methods by way of which polymers can be produced from said compositions.
    Type: Application
    Filed: November 14, 2017
    Publication date: June 18, 2020
    Inventors: Paul HEINZ, Richard MEISENHEIMER, Jöng TILLACK, Dirk ACHTEN, Thomas BÜSGEN, Michael LUDEWIG, Christoph TOMCZYK, Roland WAGNER
  • Publication number: 20200140707
    Abstract: The present invention relates to a method for producing an object in an additive manufacturing process from a precursor and comprises the following steps: I) depositing a layer of a radically cross-linkable construction material, which corresponds to a first selected cross-section of the precursor, on a carrier; II) depositing a layer of a radically cross-linkable construction material, which corresponds to a further selected cross-section of the precursor, on a previously applied layer of the radically cross-linked construction material; III) repeating step II) until the precursor is formed. The radically cross-linkable construction material comprises a thermoplastic radically cross-linkable polyurethane with a urethane group content of ?5% by weight and a photoinitiator. The radically cross-linkable construction material is also heated to a processing temperature that is greater than the melting point of the radically cross-linkable polyurethane. After step III) the precursor having a temperature of 20° C.
    Type: Application
    Filed: June 29, 2018
    Publication date: May 7, 2020
    Inventors: Dirk Achten, Thomas Buesgen, Christoph Tomczyk, Michael Ludewig, Thomas Faecke, Roland Wagner, Florian Stempfle
  • Patent number: 10640604
    Abstract: The present invention relates to hydrophilized polyurethanes having a particularly high content of hydroxy-functional, unsaturated triglycerides, to a process for preparing polyurethane dispersions based thereon, to the use of the dispersions as binders in oxidatively drying coating materials having particularly high chemical resistance, and to articles and substrates coated with these coating materials.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: May 5, 2020
    Assignee: Covestro Deutschland AG
    Inventors: Michael Ludewig, Maria Almato Guiteras, Pantea Nazaran, Eva Tejada Rosales
  • Publication number: 20200071449
    Abstract: The present invention relates to a process for producing (cyclo)aliphatic polycarbonate polyols comprising the steps of a) reaction of at least one (cyclo)aliphatic polyol and at least one alkyl carbonate in the presence of at least one basic catalyst and b) neutralization by addition of at least one organic sulfonic acid having a molecular weight of 250 to 1000 g/mol and at least one branched or unbranched alkyl substitution having at least four carbon atoms, wherein step b) is performed after step a).
    Type: Application
    Filed: December 18, 2017
    Publication date: March 5, 2020
    Inventors: Michael LUDEWIG, Stefan SOMMER, Holger BREUER, Michael Grahl
  • Publication number: 20190367666
    Abstract: The present invention relates to polymerizable compositions which contain components that can be crosslinked both via isocyanurate bonds and by a radical reaction mechanism. The invention further relates to methods by way of which polymers can be produced from said compositions.
    Type: Application
    Filed: November 14, 2017
    Publication date: December 5, 2019
    Inventors: Jörg TILLACK, Dirk ACHTEN, Paul HEINZ, Richard MEISENHEIMER, Thomas BÜSGEN, Michael LUDEWIG, Christoph TOMCZYK, Roland WAGNER
  • Publication number: 20190367665
    Abstract: The present invention relates to polymerizable compositions which contain components that can be crosslinked both via isocyanurate bonds and by a radical reaction mechanism. The invention further relates to methods by way of which polymers can be produced from said compositions.
    Type: Application
    Filed: November 14, 2017
    Publication date: December 5, 2019
    Inventors: Paul HEINZ, Richard MEISENHEIMER, Jörg TILLACK, Dirk ACHTEN, Thomas BÜSGEN, Michael LUDEWIG, Christoph TOMCZYK, Roland WAGNER, Alisa KAYSER
  • Publication number: 20190337224
    Abstract: A process for producing an object from a precursor comprises the steps of: I) depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; II) depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; III) repeating step II) until the precursor is formed; wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the object and wherein the free-radically crosslinkable resin has a viscosity (23° C., DIN EN ISO 2884-1) of ?5 mPas to ?100000 mPas.
    Type: Application
    Filed: November 14, 2017
    Publication date: November 7, 2019
    Inventors: Dirk Achten, Thomas BÜSGEN, Jörg TILLACK, Michael LUDEWIG, Christoph TOMCZYK, Roland WAGNER
  • Patent number: 10449714
    Abstract: A process for producing an object from a precursor comprises the steps of: depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; repeating step II) until the precursor is formed; wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the object and wherein the free-radically crosslinkable resin has a viscosity (23° C., DIN EN ISO 2884-1) of ?5 mPas to ?100000 mPas.
    Type: Grant
    Filed: November 14, 2017
    Date of Patent: October 22, 2019
    Assignee: Covestro Deutschland AG
    Inventors: Dirk Achten, Thomas Büsgen, Jörg Tillack, Michael Ludewig, Christoph Tomczyk, Roland Wagner
  • Publication number: 20190275732
    Abstract: A method for producing an article in which a layer with a radically cross-linkable resin is selectively crosslinked at least partially. This takes place according to a selected cross section of the article to be formed by means of selective application of a radical initiator. The at least partially crosslinked material is added on layer by layer to a carrier or to previous layers bonded to the carrier. A system that is suitable for carrying out the method according to the invention has a substrate, a control unit, an application unit for applying the resin to the substrate, an application unit for applying an initiator to the resin, an energy exposure unit and a contacting unit.
    Type: Application
    Filed: December 4, 2017
    Publication date: September 12, 2019
    Inventors: Dirk ACHTEN, Thomas BÜSGEN, Michael LUDEWIG, Roland WAGNER, Christoph TOMCZYK, Jörg TILLACK, Arnaud GENOU
  • Publication number: 20180273797
    Abstract: The present invention concerns coated films, comprising a plastic film and a radiation-curable aqueous coating material, wherein the coating material comprises a polyurethane (meth)acrylate with particularly high hydrolysis resistance. Furthermore, it concerns a method for producing such films, the use of such films for producing mouldings, a method for producing mouldings with a radiation-cured coating and mouldings that can be produced by this method and the aqueous radiation-curable binding and coating material, which are contained in the coating.
    Type: Application
    Filed: September 13, 2016
    Publication date: September 27, 2018
    Applicant: COVESTRO DEUTSCHLAND AG
    Inventors: Michael LUDEWIG, Joachim PETZOLDT
  • Patent number: 9988485
    Abstract: The present invention provides a process for preparing radiation-curing allophanates having residual monomer contents of less than 0.5% by weight and an NCO content of less than 1% by weight, wherein (A) compounds containing isocyanate groups, (B) hydroxy-functional compounds which contain groups which react, with polymerization, with ethylenically unsaturated compounds on exposure to actinic radiation (radiation-curing groups) and (C) optionally further compounds containing NCO-reactive groups, also optionally in the presence of a catalyst, are used to form NCO-group-containing urethanes having radiation-curing groups, which are subsequently reacted, without further addition of compounds containing isocyanate groups, in the presence of an allophanatization catalyst, the ratio of NCO groups of the compounds from A) to the OH groups of the compounds from B) and, where used, C) being 1.45:1.0 to 1.1:1.0.
    Type: Grant
    Filed: December 23, 2015
    Date of Patent: June 5, 2018
    Assignee: ALLNEX NETHERLANDS B.V.
    Inventors: Michael Ludewig, Jan Weikard
  • Publication number: 20180133953
    Abstract: A process for producing an object from a precursor comprises the steps of: depositing a free-radically crosslinked resin atop a carrier to obtain a ply of a construction material joined to the carrier which corresponds to a first selected cross section of the precursor; depositing a free-radically crosslinked resin atop a previously applied ply of the construction material to obtain a further ply of the construction material which corresponds to a further selected cross section of the precursor and which is joined to the previously applied ply; repeating step II) until the precursor is formed; wherein the depositing of a free-radically crosslinked resin at least in step II) is effected by exposure and/or irradiation of a selected region of a free-radically crosslinkable resin corresponding to the respectively selected cross section of the object and wherein the free-radically crosslinkable resin has a viscosity (23° C., DIN EN ISO 2884-1) of ?5 mPas to ?100000 mPas.
    Type: Application
    Filed: November 14, 2017
    Publication date: May 17, 2018
    Inventors: Dirk Achten, Thomas Büsgen, Jörg Tillack, Michael Ludewig, Christoph Tomczyk, Roland Wagner
  • Publication number: 20170166685
    Abstract: The present invention relates to hydrophilized polyurethanes having a particularly high content of hydroxy-functional, unsaturated triglycerides, to a process for preparing polyurethane dispersions based thereon, to the use of the dispersions as binders in oxidatively drying coating materials having particularly high chemical resistance, and to articles and substrates coated with these coating materials.
    Type: Application
    Filed: December 6, 2016
    Publication date: June 15, 2017
    Inventors: Michael Ludewig, Maria Almato Guiteras, Pantea Nazaran, Eva Tejada
  • Patent number: 9631117
    Abstract: The present invention relates to a process for the preparation of highly reactive, low-viscosity and water-dilutable polyisocyanate reaction products which contain activated groups which react, by polymerization, with ethylenically unsaturated compounds under the action of actinic radiation. The present invention furthermore relates to a process for the preparation of such products and their use.
    Type: Grant
    Filed: October 15, 2012
    Date of Patent: April 25, 2017
    Inventors: Stefan Sommer, Michael Ludewig, Wolfgang Fischer, Nusret Yuva