Patents by Inventor Stephan Kohlstruk

Stephan Kohlstruk 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: 10669293
    Abstract: The present invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilanoalkylamine is reacted with urea in the presence of an alcohol, optionally in the presence of at least one catalyst, to give alkoxysilanoalkylurethane, B) simultaneously or successively, if used, the catalyst is removed and/or deactivated, and low boilers, medium boilers and/or high boilers are removed, C) purified alkoxysilanoalkylurethane is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, in which, in step C), i) the bottoms material is wholly or partly discharged from the cleavage apparatus, ii) subjected to thermal treatment and/or purification and/or an aftertreatment in the presence of alcohol and iii) the material removed, after thermal treatment
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: June 2, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Dirk Hoppe, Emmanouil Spyrou
  • Patent number: 10633401
    Abstract: The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane, B) simultaneously or successively, the catalyst is deactivated, and low boilers, solids, salt burdens and/or high boilers are removed, C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, wherein the process regime at least of steps C) to D) is continuous.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: April 28, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Emmanouil Spyrou, Dirk Hoppe
  • Patent number: 10626131
    Abstract: The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane, B) simultaneously or successively, the catalyst is removed and/or deactivated, and low boilers, solids, salt burdens and/or high boilers are removed, C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, wherein the basic catalyst is a guanidine base.
    Type: Grant
    Filed: March 15, 2019
    Date of Patent: April 21, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Emmanouil Spyrou, Dirk Hoppe
  • Patent number: 10611782
    Abstract: The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) haloalkylalkoxysilane is reacted with metal cyanate and alcohol to give alkoxysilanoalkylurethane, B) alkoxysilanoalkylurethane is freed of low boilers, solids, salt burdens and/or high boilers and optionally purified, C) alkoxysilanoalkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from cleavage bottoms material and collected, wherein the process regime at least of steps C) to D) is continuous.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: April 7, 2020
    Assignee: Evonik Operations GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Emmanouil Spyrou, Dirk Hoppe
  • Patent number: 10519096
    Abstract: The present invention relates to a process for hydrogenating nitrile compounds to amino compounds, in which the cross-sectional loading of the reactor during the hydrogenation is less than or equal to 4.0 kg/m2*s, based on the liquid phase.
    Type: Grant
    Filed: May 17, 2018
    Date of Patent: December 31, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Anne Rittsteiger, Stephan Kohlstruk, Dirk Hoppe, Alexander Martin Rüfer, Sabrina Sowka, Sven Schneider, Norbert Schlüter, Axel Hengstermann, Markus Galle, Stefan Röder, Monika Berweiler
  • Publication number: 20190300551
    Abstract: The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) haloalkylalkoxysilane is reacted with metal cyanate and alcohol to give alkoxysilanoalkylurethane, B) alkoxysilanoalkylurethane is freed of low boilers, solids, salt burdens and/or high boilers and optionally purified, C) alkoxysilanoalkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from cleavage bottoms material and collected, wherein the process regime at least of steps C) to D) is continuous.
    Type: Application
    Filed: March 18, 2019
    Publication date: October 3, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Emmanouil Spyrou, Dirk Hoppe
  • Publication number: 20190300550
    Abstract: The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane, B) simultaneously or successively, the catalyst is deactivated, and low boilers, solids, salt burdens and/or high boilers are removed, C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, pa wherein the process regime at least of steps C) to D) is continuous.
    Type: Application
    Filed: March 15, 2019
    Publication date: October 3, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Emmanouil Spyrou, Dirk Hoppe
  • Publication number: 20190300549
    Abstract: The invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilano(cyclo)alkylamine is reacted with dialkyl carbonate in the presence of a basic catalyst to give alkoxysilano(cyclo)alkylurethane, B) simultaneously or successively, the catalyst is removed and/or deactivated, and low boilers, solids, salt burdens and/or high boilers are removed, C) alkoxysilano(cyclo)alkylurethane obtained after B) is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, wherein the basic catalyst is a guanidine base.
    Type: Application
    Filed: March 15, 2019
    Publication date: October 3, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Emmanouil Spyrou, Dirk Hoppe
  • Publication number: 20190300553
    Abstract: The present invention relates to a process for preparing isocyanate containing alkoxysilane groups, in which, in the sequence of steps A) to D), A) alkoxysilanoalkylamine is reacted with urea in the presence of an alcohol, optionally in the presence of at least one catalyst, to give alkoxysilanoalkylurethane, B) simultaneously or successively, if used, the catalyst is removed and/or deactivated, and low boilers, medium boilers and/or high boilers are removed, C) purified alkoxysilanoalkylurethane is thermally cleaved to release isocyanate containing alkoxysilane groups and by-product, leaving bottoms material, and D) isocyanate containing alkoxysilane groups and by-product are separated from one another and from bottoms material and collected, in which, in step C), i) the bottoms material is wholly or partly discharged from the cleavage apparatus, ii) subjected to thermal treatment and/or purification and/or an aftertreatment in the presence of alcohol and iii) the material removed, after thermal treatment
    Type: Application
    Filed: March 18, 2019
    Publication date: October 3, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Manfred Kreczinski, Stephan Kohlstruk, Dirk Hoppe, Emmanouil Spyrou
  • Patent number: 10343975
    Abstract: A process for fine purification of isophoronediamine (IPDA), including producing IPDA by aminating hydrogenation of isophorone nitrile in the presence of at least ammonia, hydrogen, a a hydrogenation catalyst and optionally further additions to obtain a crude IPDA, and subjecting the crude IPDA to a fine purification via two vacuum distillation columns, wherein in the first vacuum distillation column the removal of any remaining relatively low-boiling byproducts is effected and in the second vacuum distillation column the IPDA is obtained in pure form as tops and thus separated from the organic residues, and wherein the first vacuum distillation column has vacuum distillation column has a partial condenser fitted to it.
    Type: Grant
    Filed: March 30, 2017
    Date of Patent: July 9, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Anne Rittsteiger, Alexander Martin Rüfer, Guido Streukens, Stephan Kohlstruk, Matthias Orschel, Matthias Mendorf, Jorn Walscharts, Axel Hengstermann, Anja Müller
  • Publication number: 20190106377
    Abstract: A compound of the structural formula 1 Also disclosed is a process for producing 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine by A) reacting isophorone nitrile and malononitrile to afford the intermediate 2-(3-cyano-3,5,5-trimethylcyclohexylidene) malononitrile, and B) hydrogenating 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120° C. and at 20-300 bar.
    Type: Application
    Filed: November 1, 2018
    Publication date: April 11, 2019
    Applicant: Evonik Degussa GmbH
    Inventors: Alexander Martin RÜFER, Anne RITTSTEIGER, Jörg-Joachim NITZ, Stephan KOHLSTRUK, Martina ORTELT, Dirk FUCHSMANN, Michael DEMMING, Christine STEMMER, Denise OTT, Anja Poschen
  • Patent number: 10252980
    Abstract: A compound of the structural formula 1 as a hardener in epoxy resin composition.
    Type: Grant
    Filed: November 1, 2018
    Date of Patent: April 9, 2019
    Assignee: EVONIK DEGUSSA GMBH
    Inventors: Alexander Martin Rüfer, Anja Poschen, Anne Rittsteiger, Jörg-Joachim Nitz, Stephan Kohlstruk, Martina Ortelt, Dirk Fuchsmann, Michael Demming, Christine Stemmer, Denise Ott
  • Patent number: 10221277
    Abstract: An epoxy resin composition including A) at least one epoxy compound and B) a hardener composition including B1) 0.1%-100% by weight of 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine, and B2) 99.9%-0% by weight of at least one further diamine and/or polyamine, where the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1.
    Type: Grant
    Filed: May 23, 2017
    Date of Patent: March 5, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Eike Langkabel, Martina Ortelt, Dirk Fuchsmann, Jaclyn Balthasar, Alexander Martin Rüfer, Anne Rittsteiger, Jörg-Joachim Nitz, Stephan Kohlstruk
  • Patent number: 10214612
    Abstract: An epoxy resin composition including A) at least one epoxy compound, and B) a hardener composition including B1) from 0.1%-100% by weight of 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine, and B2) from 99.9%-0% by weight of at least one further diamine and/or polyamine, where the stoichiometric ratio of the epoxy groups of A) and the number of active hydrogen atoms of the functional groups of B) varies from 1:2 to 2:1.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: February 26, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Eike Langkabel, Martina Ortelt, Dirk Fuchsmann, Jaclyn Balthasar, Alexander Martin Rüfer, Anne Rittsteiger, Jörg-Joachim Nitz, Stephan Kohlstruk
  • Patent number: 10173979
    Abstract: The present invention relates to 2-(2,2,6,6-tetramethylpiperidin-4-yl)propane-1,3-diamine, which can be used as hardener in epoxide applications.
    Type: Grant
    Filed: December 5, 2017
    Date of Patent: January 8, 2019
    Assignee: Evonik Degussa GmbH
    Inventors: Alexander Martin Rüfer, Anne Rittsteiger, Jörg-Joachim Nitz, Stephan Kohlstruk, Martina Ortelt, Dirk Fuchsmann, Michael Demming, Christine Stemmer, Denise Ott, Anja Stasch
  • Patent number: 10160717
    Abstract: A compound of the structural formula 1 A process for producing 2-(3-(aminomethyl)-3,5,5-trimethylcyclohexyl)propane-1,3-diamine by A) reacting isophorone nitrile and malononitrile to afford the intermediate 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile, and B) hydrogenating 2-(3-cyano-3,5,5-trimethylcyclohexylidene)malononitrile in the presence of at least one catalyst. In another embodiment, the hydrogenation in step B) of the process is performed at 20-120° C. and at 20-300 bar.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: December 25, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Alexander Martin Rüfer, Anne Rittsteiger, Jörg-Joachim Nitz, Stephan Kohlstruk, Martina Ortelt, Dirk Fuchsmann, Michael Demming, Christine Stemmer, Denise Ott, Anja Stasch
  • Publication number: 20180339959
    Abstract: The present invention relates to a process for hydrogenating nitrile compounds to amino compounds, in which the cross-sectional loading of the reactor during the hydrogenation is less than or equal to 4.0 kg/m2*s, based on the liquid phase.
    Type: Application
    Filed: May 17, 2018
    Publication date: November 29, 2018
    Inventors: Anne Rittsteiger, Stephan Kohlstruk, Dirk Hoppe, Alexander Martin Rüfer, Sabrina Sowka, Sven Schneider, Norbert Schlüter, Axel Hengstermann, Markus Galle, Stefan Röder, Monika Berweiler
  • Patent number: 10125089
    Abstract: Process for preparing isophoronediamine, characterized in that A) isophoronenitrile is subjected directly in one stage to aminating hydrogenation to give isophoronediamine in the presence of ammonia, hydrogen, a hydrogenation catalyst and possibly further additions, and in the presence or absence of organic solvents; or B) isophoronenitrile is first converted fully or partly in at least two or more than two stages to isophoronenitrile imine, and this isophoronenitrile imine is subjected to aminating hydrogenation to give isophoronediamine as a pure substance or in a mixture with other components and/or isophoronenitrile, in the presence of at least ammonia, hydrogen and a catalyst.
    Type: Grant
    Filed: January 26, 2016
    Date of Patent: November 13, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Stephan Kohlstruk, Anne Rittsteiger, Alexander Martin Rüfer, Norbert Schlüter, Sven Schneider, Sabrina Sowka, Guido Streukens, Stefan Röder, Monika Berweiler
  • Patent number: 10093605
    Abstract: The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.
    Type: Grant
    Filed: November 27, 2017
    Date of Patent: October 9, 2018
    Assignee: Evonik Degussa GmbH
    Inventors: Stephanie Bajus, Jan Caßens, Jens Döring, Jörg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen
  • Publication number: 20180155264
    Abstract: The present invention provides a novel process for producing 2,6,6-trimethyl-2-cyclohexene-1,4-dione (keto-isophorone) by catalytic oxidation of 3,5,5-trimethylcyclohexa-3-ene-1-one (?-isophorone) with hydrogen peroxide as the oxidant. In particular, the novel process includes phase transfer reagent in a biphasic system including an organic phase and an aqueous phase wherein the biphasic system includes 1) a tungsten polyoxyometallate as catalyst and hydrogen peroxide, and/or 2) a mixture of a) a mineral acid, b) hydrogen peroxide, and c) a metal tungstate.
    Type: Application
    Filed: November 27, 2017
    Publication date: June 7, 2018
    Inventors: Stephanie Bajus, Jan Caßens, Jens Döring, Jörg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen