Patents by Inventor Lars Hellkuhl

Lars Hellkuhl 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).

  • Compositions comprising alkoxysilane-containing isocyanates and acid stabilisers
    Patent number: 9593135
    Abstract: The present invention relates to a composition comprising (A) an isocyanate of formula (I) OCN-A-SiR1R2R3 (I), wherein A is straight-chain, branched, substituted and/or unsubstituted aliphatic hydrocarbyl of 1 to 12 carbon atoms or substituted or unsubstituted cycloaliphatic hydrocarbyl of 4 to 18 carbon atoms, wherein R1 is selected from the group comprising —O—Ralk, wherein R2 and R3 are each independently selected from the group of substituents comprising —Ralk and —O—Ralk, and wherein —Ralk is hydrocarbyl of 1 to 6 carbon atoms, and B) a Bronstedt or Lewis acid or a compound which releases a Bronstedt or Lewis acid at room temperature; and also to a process for producing a stabilized alkoxysilane-containing isocyanate comprising the step of adding a Lewis or Bronstedt acid or a compound which releases a Bronstedt or Lewis acid at room temperature to an alkoxysilane-containing isocyanate.
    Type: Grant
    Filed: September 25, 2013
    Date of Patent: March 14, 2017
    Assignee: EVONIK DEGUSSA GmbH
    Inventors: Emmanouil Spyrou, Manfred Kreczinski, Holger Loesch, Andrea Thesing, Lars Hellkuhl
  • COMPOSITIONS COMPRISING ALKOXYSILANE-CONTAINING ISOCYANATES AND ACID STABILISERS
    Publication number: 20150274760
    Abstract: The present invention relates to a composition comprising (A) an isocyanate of formula (I) OCN-A-SiR1R2R3 (I), wherein A is straight-chain, branched, substituted and/or unsubstituted aliphatic hydrocarbyl of 1 to 12 carbon atoms or substituted or unsubstituted cycloaliphatic hydrocarbyl of 4 to 18 carbon atoms, wherein R1 is selected from the group comprising —O—Ralk, wherein R2 and R3 are each independently selected from the group of substituents comprising —Ralk and —O—Ralk, and wherein —Ralk is hydrocarbyl of 1 to 6 carbon atoms, and B) a Bronstedt or Lewis acid or a compound which releases a Bronstedt or Lewis acid at room temperature; and also to a process for producing a stabilized alkoxysilane-containing isocyanate comprising the step of adding a Lewis or Bronstedt acid or a compound which releases a Bronstedt or Lewis acid at room temperature to an alkoxysilane-containing isocyanate.
    Type: Application
    Filed: September 25, 2013
    Publication date: October 1, 2015
    Applicant: EVONIK INDUSTRIES AG
    Inventors: Emmanouil SPYROU, Manfred KRECZINSKI, Holger LOESCH, Andrea THESING, Lars HELLKUHL
  • Use of ?-isophorone as solvent
    Patent number: 8846979
    Abstract: The invention relates to the use of ?-isophorone as solvent.
    Type: Grant
    Filed: June 7, 2011
    Date of Patent: September 30, 2014
    Assignee: Evonik Degussa GmbH
    Inventors: Emmanouil Spyrou, Lars Hellkuhl, Marina Grammenos, Andrea Henschke
  • 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
  • USE OF BETA-ISOPHORONE AS SOLVENT
    Publication number: 20140005438
    Abstract: The invention relates to the use of ?-isophorone as solvent
    Type: Application
    Filed: June 7, 2011
    Publication date: January 2, 2014
    Applicant: Evonik Degussa GmbH
    Inventors: Emmanouil Spyrou, Lars Hellkuhl, Marina Grammenos, Andrea Henschke
  • 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
  • POWDER COATING COMPOSITIONS WITH CRYSTALLINE CONSTITUENTS THAT ARE STABLE IN STORAGE
    Publication number: 20100179273
    Abstract: The present invention relates to storage-stable reactive powder coating compositions based on (semi)crystalline and amorphous ingredients and to their use as powder coatings.
    Type: Application
    Filed: October 13, 2006
    Publication date: July 15, 2010
    Applicant: EVONIK DEGUSSA GmbH
    Inventors: Emmanouil Spyrou, Lars Hellkuhl