Patents by Inventor Maria Gleixner

Maria Gleixner 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: 11976165
    Abstract: The present invention relates to a method for producing a double metal cyanide (DMC) catalyst, comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand, optionally a complex-forming component to form a dispersion, the dispersion being produced using a mixing nozzle and a peroxide. The invention further relates to double metal cyanide (DMC) catalysts obtainable by means of the method according to the invention and to the use of DMC catalysts to produce polyoxyalkylene polyols.
    Type: Grant
    Filed: January 11, 2021
    Date of Patent: May 7, 2024
    Assignee: Covestro Deutschland AG
    Inventors: Joerg Hofmann, Klaus Lorenz, Elisabeth Vogelsang, Maria Gleixner
  • Patent number: 11813595
    Abstract: The present invention relates to a process for preparing a double metal cyanide catalyst (DMC) comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand and a complex-forming component, to form a dispersion, wherein the reaction is effected using a mixing nozzle and wherein the process temperature of the dispersion during the reaction is between 26° C. and 49° C. The subject matter of the invention further encompasses double metal cyanide catalysts (DMC) obtained in accordance with the process according to the invention and also the use of the DMC catalysts for the preparation of polyoxyalkylene polyols.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: November 14, 2023
    Assignee: Covestro Intellectual Property GmbH & Co. KG
    Inventors: Joerg Hofmann, Maria Gleixner, Thomas Asma
  • Publication number: 20230046210
    Abstract: The present invention relates to a process for preparing a double metal cyanide (DMC) catalyst, comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of an alkaline metal cyanide salt, an organic complex ligand and optionally a complex-forming component, wherein the metal cyanide salt is one or more compound(s) and is selected from the group consisting of potassium hexacyanocobaltat(III), potassium hexacyanoferrate(II), potassium hexacyanoferrate(III), calcium hexacyanocobaltate(III) and lithium hexacyanocobaltat(III), where the organic complex ligand is one or more compound(s) and is selected from the group consisting of dimethoxyethane, tert-butanol, 2-methyl-3-buten-2-ol, 2-methyl-3-butyn-2-ol, ethylene glycol mono-tert-butyl ether and 3-methyl-3-oxetanemethanol, and wherein the alkaline metal cyanide salt used has an alkalinity by the titration method disclosed in the Experimental of between 0.700% and 3.
    Type: Application
    Filed: February 17, 2021
    Publication date: February 16, 2023
    Inventors: Joerg Hofmann, Maria Gleixner, Thomas Asma
  • Publication number: 20230038100
    Abstract: The present invention relates to a method for producing a double metal cyanide (DMC) catalyst, comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand, optionally a complex-forming component to form a dispersion, the dispersion being produced using a mixing nozzle and a peroxide. The invention further relates to double metal cyanide (DMC) catalysts obtainable by means of the method according to the invention and to the use of DMC catalysts to produce polyoxyalkylene polyols.
    Type: Application
    Filed: January 11, 2021
    Publication date: February 9, 2023
    Inventors: Joerg HOFMANN, Klaus LORENZ, Elisabeth VOGELSANG, Maria GLEIXNER
  • Publication number: 20210308657
    Abstract: The present invention relates to a process for preparing a double metal cyanide catalyst (DMC) comprising the reaction of an aqueous solution of a cyanide-free metal salt, an aqueous solution of a metal cyanide salt, an organic complex ligand and a complex-forming component, to form a dispersion, wherein the reaction is effected using a mixing nozzle and wherein the process temperature of the dispersion during the reaction is between 26° C. and 49° C. The subject matter of the invention further encompasses double metal cyanide catalysts (DMC) obtainable in accordance with the process according to the invention and also the use of the DMC catalysts for the preparation of polyoxyalkylene polyols.
    Type: Application
    Filed: August 6, 2019
    Publication date: October 7, 2021
    Inventors: Joerg Hofmann, Maria Gleixner, Thomas Asma