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).

  • MULTICOLOURED FUSED DEPOSITION MODELLING PRINT
    Publication number: 20160059488
    Abstract: The invention relates to a modified fused deposition modeling process for production of multicolored three-dimensional objects. More particularly, the invention relates to a 3D printing process with which 3D objects with particularly good color appearance compared to the prior art can be produced. The process according to the invention is based on coloring of the polymer strand used for production of the actual object in the nozzle, and on using a mixing apparatus which comprises a plurality of injection needles, a static mixer or a dynamic mixer.
    Type: Application
    Filed: September 8, 2015
    Publication date: March 3, 2016
    Applicant: EVONIK ROEHM GmbH
    Inventors: Markus PRIDOEHL, Guenter SCHMITT, Dirk POPPE, Stephan KOHLSTRUK, Benjamin HAMMANN, Sonja CREMER, Kris BEKS, Ludo DEWAELHEYNS
  • PROCESS FOR THE ELECTROCHEMICAL PRODUCTION OF 2,2,4-TRIMETHYLADIPIC ACID AND 2,4,4-TRIMETHYLADIPIC ACID
    Publication number: 20150225861
    Abstract: A process for the electrochemical production of 2,2,4-trimethyladipic acid and 2,4,4-trimethyladipic acid by electrochemical oxidative ring cleavage of a mixture of cis- and trans-3,3,5-trimethylcyclohexanol.
    Type: Application
    Filed: February 11, 2015
    Publication date: August 13, 2015
    Applicant: EVONIK INDUSTRIES AG
    Inventors: Carl-Friedrich HOPPE, Stephan KOHLSTRUK, Manfred KRECZINSKI, Matthias MENDORF, Holger WIEDERHOLD
  • Hydrolysis of the residues obtained in the production of isophorone to recover isophorone and acetone
    Patent number: 9035102
    Abstract: A process for preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) is provided wherein distillation vapors from the work-up of product fractions are recycled to earlier stages of operation of the process.
    Type: Grant
    Filed: August 8, 2014
    Date of Patent: May 19, 2015
    Assignee: Evonik Industries AG
    Inventors: Joerg-Joachim Nitz, Stephan Kohlstruk, Robert Jansen, Matthias Orschel, Andreas Merkel, Michael Demming, Matthias Mendorf, Jens Doering, Axel Hengstermann, Andreas Hoff, Anja Mueller
  • HYDROLYSIS OF THE RESIDUES OBTAINED IN THE PRODUCTION OF ISOPHORONE TO RECOVER ISOPHORONE AND ACETONE
    Publication number: 20150045585
    Abstract: A process for preparing isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) is provided wherein distillation vapors from the work-up of product fractions are recycled to earlier stages of operation of the process.
    Type: Application
    Filed: August 8, 2014
    Publication date: February 12, 2015
    Applicant: Evonik Industries AG
    Inventors: Joerg-Joachim NITZ, Stephan KOHLSTRUK, Robert JANSEN, Matthias ORSCHEL, Andreas MERKEL, Michael DEMMING, Matthias MENDORF, Jens DOERING, Axel HENGSTERMANN, Andreas HOFF, Anja MUELLER
  • Low monomer 1 : 1 monoadducts of reactive olefinic compounds and diisocyanates using insertable inhibitors
    Patent number: 8841479
    Abstract: The invention relates to low monomer 1:1 monoadducts of reactive olefinic compounds and diisocyanates, to the production and to the use thereof.
    Type: Grant
    Filed: October 22, 2009
    Date of Patent: September 23, 2014
    Assignee: Evonik Degussa GmbH
    Inventors: Emmanouil Spyrou, Stephan Kohlstruk, Elke Gollan, Andrea Henschke, Nicole Fresmann
  • Process for the continuous preparation of (cyclo)aliphatic diisocyanates
    Patent number: 8816125
    Abstract: The invention relates to a multi-stage process for the continuous, phosgene-free preparation of (cyclo)aliphatic diisocyanates that comprises the conversion of (cyclo)aliphatic diamines into the corresponding (cyclo)alkylene biscarbamates and the thermal cleaving of the latter into the (cyclo)alkylene diisocyanates and alcohol. The urea used in accordance with the invention and also the urea employed for the preparation of urea equivalents (e.g. alkyl carbonates, alkyl carbamates) as a possible precursor for the synthesis of the (cyclo)aliphatic biscarbamates is unconditioned.
    Type: Grant
    Filed: November 5, 2007
    Date of Patent: August 26, 2014
    Assignee: Evonik Degussa GmbH
    Inventors: Hans-Werner Michalczak, Stephan Kohlstruk, Manfred Kreczinski, Gerda Grund, Rainer Lomoelder
  • Method for producing 1:1 adducts having a low monomer content from hydroxyalkyl(meth)acrylates and diisocyanates
    Patent number: 8729259
    Abstract: The present invention relates to the production and the use of 1:1 adducts having a low monomer content from hydroxyalkyl(meth)acrylates and diisocyanates.
    Type: Grant
    Filed: February 8, 2010
    Date of Patent: May 20, 2014
    Assignee: Evonik Degussa GmbH
    Inventors: Emmanouil Spyrou, Stephan Kohlstruk, Lars Hellkuhl, Heinz Grosse-Beck, Marita Druener
  • MULTICOLOUR EXTRUSION-BASED 3D PRINT PROCESS
    Publication number: 20140134334
    Abstract: A 3D extrusion print process for producing multicolored three-dimensional objects is provided. The process produces mechanically stable, multicolored 3D objects with good color definition. The process according to the invention is based on coating, upstream of the printing head, of the polymer strand used for producing the actual object, and on fixing of the coating upstream of entry of the polymer strand into the printing head. Downstream of the extrusion process in the printing head, the coating remains predominantly at the surface of the extruded strand.
    Type: Application
    Filed: October 31, 2013
    Publication date: May 15, 2014
    Applicant: Evonik Industries AG
    Inventors: Markus PRIDOEHL, Guenter Schmitt, Dirk Poppe, Stephan Kohlstruk, Benjamin Hammann, Sonja Cremer, Kris Beks, Ludo Dewaelheyns
  • MULTICOLOURED FUSED DEPOSITION MODELLING PRINT
    Publication number: 20140088751
    Abstract: The invention relates to a modified fused deposition modeling process for production of multicolored three-dimensional objects. More particularly, the invention relates to a 3D printing process with which 3D objects with particularly good color appearance compared to the prior art can be produced. The process according to the invention is based on surface coloring or additive coating of the polymer strand used for production of the actual object or of the melt which results therefrom in the nozzle.
    Type: Application
    Filed: April 3, 2012
    Publication date: March 27, 2014
    Applicant: Evonik Roehm GmbH
    Inventors: Markus Pridoehl, Guenter Schmitt, Dirk Poppe, Stephan Kohlstruk, Benjamin Hammann, Sonja Cremer, Kris Beks, Ludo Dewaelheyns
  • MULTICOLOURED FUSED DEPOSITION MODELLING PRINT
    Publication number: 20140079841
    Abstract: The invention relates to a modified fused deposition modeling process for production of multicolored three-dimensional objects. More particularly, the invention relates to a 3D printing process with which 3D objects with particularly good color appearance compared to the prior art can be produced. The process according to the invention is based on coloring of the polymer strand used for production of the actual object in the nozzle, and on using a mixing apparatus which comprises a plurality of injection needles, a static mixer or a dynamic mixer.
    Type: Application
    Filed: April 3, 2012
    Publication date: March 20, 2014
    Applicant: Evonik Roehm GmbH
    Inventors: Markus Pridoehl, Guenter Schmitt, Dirk Poppe, Stephan Kohlstruk, Benjamin Hammann, Sonja Cremer, Kris Beks, Ludo Dewaelheyns
  • COMPOSITE SEMIFINISHED PRODUCTS, MOLDED PARTS PRODUCED THEREFROM, AND MOLDED PARTS PRODUCED DIRECTLY BASED ON HYDROXY-FUNCTIONALIZED (METH)ACRYLATES, WHICH ARE CROSS-LINKED BY MEANS OF URETDIONES IN A THERMOSETTING MANNER
    Publication number: 20130323993
    Abstract: The invention relates to a process for producing polyurethane prepregs which are stable during storage, and to mouldings (composite components) produced therefrom. The prepregs or components are produced by mixing (meth)acrylate monomers, (meth)acrylate polymers, hydroxy-functionalized (meth)acrylate monomers and/or hydroxy-functionalized (meth)acrylate polymers with uretdione materials and moreover with aromatic amines which accelerate a free-radical polymerization reaction. This mixture or solution is applied by known processes to fibre material, e.g. carbon fibres, glass fibres or polymer fibres, and is polymerized at room temperature or higher temperatures with the aid of initiators, e.g. dibenzoyl peroxide. Instead of amine acceleration and subsequent hardening with initiators, it is also possible to use other known room-temperature curing systems, e.g. permaleate systems. Polymerization, e.g. at room temperature or at up to 80° C.
    Type: Application
    Filed: December 1, 2011
    Publication date: December 5, 2013
    Applicant: Evonik Degussa GmbH
    Inventors: Guenter Schmitt, Sandra Reemers, Emmanouil Spyrou, Heike Heeb, Stephan Kohlstruk, Friedrich Georg Schmidt, Elke Gollan
  • Low chlorine, multi-staged method for producing cycloaliphatic disocyanates
    Patent number: 8536370
    Abstract: Low chlorine, multi-staged method for producing cycloaliphatic diisocyanates. The invention relates to a multi-staged method for the continuous low-chlorine production of cycloaliphatic diisocyanates, comprising the synthesis of diaminodipheynl alkanes, the hydration thereof into the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines to the corresponding cycloalkylene biscarbamates and the thermal cleaving of the latter into the cycloaliphatic diisocyanates and alcohol.
    Type: Grant
    Filed: May 18, 2009
    Date of Patent: September 17, 2013
    Assignee: Evonik Degussa GmbH
    Inventors: Gerda Grund, Manfred Kreczinski, Stephan Kohlstruk, Christian Lettmann
  • Polyolefin graft poly(meth)acrylate copolymer-based priming agent for polyolefin surfaces
    Patent number: 8507600
    Abstract: The invention relates to a novel halogen-free and acid-free, readily soluble priming bonding agent for polyolefins, said agent containing (meth)acrylate-grafted, amorphous polyolefins.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: August 13, 2013
    Assignees: Evonik Roehm GmbH, Evonik Degussa GmbH
    Inventors: Stephan Kohlstruk, Sven Balk, Hinnerk Gordon Becker, Lutz Mindach, Thomas Arnold, Cornelia Baumann, Elke Seipel
  • Polyolefin graft poly(meth)acrylate copolymer-based adhesion promoter for coating polyolefin surfaces
    Patent number: 8501861
    Abstract: The invention relates to a novel halogen-free and acid-free, readily soluble adhesion promoter for polyolefins, said promoter containing (meth)acrylate-grafted, amorphous polyolefins.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: August 6, 2013
    Assignees: Evonik Roehm GmbH, Evonik Degussa GmbH
    Inventors: Stephan Kohlstruk, Lutz Mindach, Stefanie Maus, Hinnerk Gordon Becker, Sven Balk
  • POLYOLEFIN GRAFT POLY(METH)ACRYLATE COPOLYMER-BASED ADHESION PROMOTER FOR COATING POLYOLEFIN SURFACES
    Publication number: 20110300322
    Abstract: The invention relates to a novel halogen-free and acid-free, readily soluble adhesion promoter for polyolefins, said promoter containing (meth)acrylate-grafted, amorphous polyolefins.
    Type: Application
    Filed: February 26, 2010
    Publication date: December 8, 2011
    Applicants: EVONIK DEGUSSA GmbH, EVONIK RÖHM GmbH
    Inventors: Stephan Kohlstruk, Lutz Mindach, Stefanie Maus, Hinnerk Gordon Becker, Sven Balk
  • METHOD FOR PRODUCING 1:1 ADDUCTS HAVING A LOW MONOMER CONTENT FROM HYDROXYALKYL(METH)ACRYLATES AND DIISOCYANATES
    Publication number: 20110301345
    Abstract: The present invention relates to the production and the use of 1:1 adducts having a low monomer content from hydroxyalkyl(meth)acrylates and diisocyanates.
    Type: Application
    Filed: February 8, 2010
    Publication date: December 8, 2011
    Applicant: Evonik Degussa GmbH
    Inventors: Emmanouil Spyrou, Stephan Kohlstruk, Lars Hellkuhl, Heinz Grosse-Beck, Marita Druener
  • POLYOLEFIN GRAFT POLY(METH)ACRYLATE COPOLYMER-BASED PRIMING AGENT FOR POLYOLEFIN SURFACES
    Publication number: 20110281054
    Abstract: The invention relates to a novel halogen-free and acid-free, readily soluble priming bonding agent for polyolefins, said agent containing (meth)acrylate-grafted, amorphous polyolefins.
    Type: Application
    Filed: February 26, 2010
    Publication date: November 17, 2011
    Applicants: EVONIK DEGUSSA GMBH, EVONIK ROEHM GMBH
    Inventors: Stephan Kohlstruk, Sven Balk, Hinnerk Gordon Becker, Lutz Mindach, Thomas Arnold, Cornelia Baumann, Elke Seipel
  • LOW MONOMER 1 : 1 MONOADDUCTS OF REACTIVE OLEFINIC COMPOUNDS AND DIISOCYANATES USING INSERTABLE INHIBITORS
    Publication number: 20110251424
    Abstract: The invention relates to low monomer 1:1 monoadducts of reactive olefinic compounds and diisocyanates, to the production and to the use thereof.
    Type: Application
    Filed: October 22, 2009
    Publication date: October 13, 2011
    Applicant: EVONIK DEGUSSA GMBH
    Inventors: Emmanouil Spyrou, Stephan Kohlstruk, Elke Gollan, Andrea Henschke, Nicole Fresmann
  • LOW CHLORINE, MULTI-STAGED METHOD FOR PRODUCING CYCLOALIPHATIC DISOCYANATES
    Publication number: 20110028755
    Abstract: Low chlorine, multi-staged method for producing cycloaliphatic diisocyanates. The invention relates to a multi-staged method for the continuous low-chlorine production of cycloaliphatic diisocyanates, comprising the synthesis of diaminodipheynl alkanes, the hydration thereof into the corresponding cycloaliphatic diamines and the subsequent conversion of cycloaliphatic diamines to the corresponding cycloalkylene biscarbamates and the thermal cleaving of the latter into the cycloaliphatic diisocyanates and alcohol.
    Type: Application
    Filed: May 18, 2009
    Publication date: February 3, 2011
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Gerda Grund, Manfred Kreczinski, Stephan Kohlstruk, Christian Lettmann
  • ALIPHATIC, CYCLOALIPHATIC OR (CYCLO)ALIPHATIC DIISOCYANATES THAT ARE STABLE IN STORAGE
    Publication number: 20100168329
    Abstract: The invention relates to aliphatic, cycloaliphatic or (cyclo)aliphatic diisocyanates, in addition to a method for their production.
    Type: Application
    Filed: October 14, 2005
    Publication date: July 1, 2010
    Applicant: DEGUSSA GmbH
    Inventors: Dirk Hoppe, Rainer Lomoelder, Stephan Kohlstruk, Hans-Werner Michalczak