Patents by Inventor Klaus Ihrig

Klaus Ihrig 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: 6583231
    Abstract: The invention relates to a process to make aminated polyolefins involving the steps of: ozonolysis of one or more low-molecular weight polyolefins with at least one end group that is unsaturated, in the presence of an alkanol-hydrocarbon mixture, to form polyolefin-alkoxyhydroperoxides, catalytic reduction of the polyolefin-alkoxyhydroperoxides with hydrogen and a suitable catalyst, to form a mixture of hemiacetals and hemiketals, in the presence of a solvent, removal of the catalyst and optional washing of the mixture resulting from step 2, to remove undesired side products, reductive amination of the hemiacetal hemiketal mixture to form the aminated polyolefin end product, preferably at a temperature of 50-200° C., optionally in the presence of a solvent, and removal of the catalyst and optional removal of the solvent. The aminated products obtained are pre-eminently suited for use as an adjuvant in oils and fuels.
    Type: Grant
    Filed: January 23, 2001
    Date of Patent: June 24, 2003
    Assignee: Akzo Nobel N.V.
    Inventors: Klaus Ihrig, Manfred Josef Bergfeld, Ulrich Wecker
  • Publication number: 20010027239
    Abstract: The invention relates to a process to make aminated polyolefins involving the steps of:
    Type: Application
    Filed: January 23, 2001
    Publication date: October 4, 2001
    Inventors: Klaus Ihrig, Manfred Josef Bergfeld, Ulrich Wecker
  • Patent number: 6222075
    Abstract: A process is described for the production of N,N,N′,N′-tetra-(2-hydroxyethyl)-ethylene diamine in a solvent, in which ethylene diamine is reacted selectively with ethylene oxide in the absence of water in one or more saturated C3-C9 alcohols at a temperature from 120 to 220° C. and at a pressure from 2 to 60 bar in a molar ratio of 1:4, with a high yield. The conversion is preferably carried out in isopropanol, isomeric C7-C9 alcohol mixtures, C8 alcohol mixtures or C9 alcohol mixtures at a temperature from 140 to 180° C.
    Type: Grant
    Filed: July 8, 1999
    Date of Patent: April 24, 2001
    Assignee: Akzo Nobel NV
    Inventors: Klaus Ihrig, Manfred Bergfeld, Christian Blaufelder