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).

  • Iisocyanato-2,2,6-trimethylcyclohexane polyisocyanates containing
    Publication number: 20010027243
    Abstract: The invention provides polyisocyanates containing isocyanate groups from 1,4-diisocyanato-2,2,6-trimethylcyclohexane, having a trimer fraction of more than 80% by weight and an NCO content of at least 19.3%.
    Type: Application
    Filed: March 29, 2001
    Publication date: October 4, 2001
    Applicant: Degussa AG
    Inventors: Stephan Kohlstruk, Emmanouil Spyrou, Klaus Pinske
  • Solid polyurethane hardeners having triazine groups, processes for preparing such compounds, and their use
    Patent number: 6258915
    Abstract: Solid polyurethane hardeners (curing agents) having triazine groups, are prepared by reacting polyaddition compounds with a second compound having a >C═N— group. The polyaddition compounds are prepared by reacting a uretdione-functional polyisocyanate with a hydroxy-functional chain extender.
    Type: Grant
    Filed: November 1, 1999
    Date of Patent: July 10, 2001
    Assignee: Degussa-Huels Aktiengesellschaft
    Inventors: Emmanouil Spyrou, Stephan Kohlstruk, Holger Loesch
  • Two-component (PU) polyurethane coating composition with high environmental and mechanical resistance
    Patent number: 6160075
    Abstract: A two-component polyurethane coating composition essentially comprising (A) a polyols component, (B) a polyisocyanate component, wherein the polyisocyanate component (B) comprises at least 30% by weight of a polyisocyanate based on 2-methylpentane-1,5-diisocyanate and a polyisocyanate based on isophorone diisocyanate, the sum of the two polyisocyanates being 100% by weight.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: December 12, 2000
    Assignee: Huels Aktiengesellschaft
    Inventors: Friedrich Plogmann, Rainer Lomoelder, Stephan Kohlstruk
  • Process for preparing a reduced-color isocyanurate-functional polyisocyanate prepared from 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI)
    Patent number: 6093817
    Abstract: A reduced-color isocyanurate-functional polyisocyanate is prepared by partially trimerizing 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (IPDI) having a low total chlorine content of less than 80 mg/kg in the presence of a catalyst, thereby resulting in a product isocyanurate-functional polyisocyanate having a content of free NCO groups of between 10 and 22% and a residual monomer content of less than 0.7%.
    Type: Grant
    Filed: December 29, 1998
    Date of Patent: July 25, 2000
    Assignee: Huels Aktiengesellschaft
    Inventors: Stephan Kohlstruk, Jansen Volker, Rainer Lomoelder