Patents by Inventor Heinz-Herbert Müller

Heinz-Herbert Müller 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).

  • Process for producing diamines and polyamines of the diphenylmethane series
    Patent number: 9701617
    Abstract: The present invention relates to a process for producing diamines and polyamines of the diphenylmethane series (MDA) by reacting aniline and formaldehyde in the presence of an acid catalyst, wherein the aniline contains in total less than 0.5 wt. %, based on the total weight of aniline, of one or more compounds which contain at least one carbonyl group or of one or more compounds that are formed by reaction of these compounds which contain at least one carbonyl group with aniline.
    Type: Grant
    Filed: March 17, 2009
    Date of Patent: July 11, 2017
    Assignee: Covestro Deutschland AG
    Inventors: Stefan Wershofen, Heinz-Herbert Müller, Richard Adamson, Fritz Pohl, Knut Sommer
  • Method and device for determining the isomer composition in isocyanate production processes
    Patent number: 7662634
    Abstract: The invention relates to a method for determining the isomer composition in an isocyanate isomer mixture, wherein a spectrum of the isomer mixture is recorded and the spectrum is entered into a chemometric calibration model.
    Type: Grant
    Filed: May 14, 2004
    Date of Patent: February 16, 2010
    Assignee: Bayer MaterialScience AG
    Inventors: Jochen Mahrenholtz, Andrea Wimschneider, Hans-Georg Pirkl, Heinz-Herbert Müller, Stefan Dresely, Jeffrey Bolton, Martin Schiffhauer, Udo Wolf, Johannes Schweer, Martin Gerlach
  • Production of di- and polyisocyanates of the diphenylmethane series with defined acidity
    Patent number: 7205430
    Abstract: The invention relates to a process for the production of di- and polyisocyanates of the diphenylmethane series and mixtures thereof, in which aniline and formaldehyde are reacted in the presence of an acid catalyst to form di- and polyamines of the diphenylmethane series; the di- and polyamines of the diphenylmethane series are phosgenated, optionally in the presence of a solvent, to obtain a crude di- and polyisocyanate; from the crude di- and polyisocyanate, at least one fraction containing at least 5 wt. % 3-ring and multi-ring MDI and at least one fraction containing at least 95 wt. % 2-ring MDI are separated by distillation, and the acidities of the fraction containing at least 5 wt. % 3-ring MDI and multi-ring MDI, and/or the fraction containing at least 95 wt. % 2-ring MDI are determined analytically; and an acidic compound is added to the fraction containing at least 5 wt. % 3-ring MDI and multi-ring MDI, and/or the fraction containing at least 95 wt.
    Type: Grant
    Filed: February 1, 2005
    Date of Patent: April 17, 2007
    Assignee: Bayer MaterialScience Aktiengesellschaft
    Inventors: Ulrich Liman, Heinz-Herbert Müller, Robert Vieler, Ralf Echterhoff
  • Process for the preparation of di- and polyamines of the diphenylmethane series
    Patent number: 7186857
    Abstract: The present invention relates to a process for the preparation of di- and polyamines of the diphenylmethane series, and to the preparation of di- and poly-isocyanates of the diphenylmethane series from these di- and poly-amines. The di- and poly-amines of the diphenylmethane series are prepared by the reaction of aniline and formaldehyde in the presence of hydrochloric acid. In with the present invention, the hydrochloric acid employed contains less than 0.001 wt. % of metal ions which are divalent and/or more than divalent.
    Type: Grant
    Filed: October 25, 2005
    Date of Patent: March 6, 2007
    Assignee: Bayer MaterialScience AG
    Inventors: Heinz-Herbert Müller, Stefan Wershofen, Stefan Grabowski
  • Process for the production of polyisocyanates of the diphenylmethane series with a reduced color value
    Patent number: 6720455
    Abstract: Polyisocyanates of the diphenylmethane series are produced by a) reacting aniline and formaldehyde in the presence of an acidic catalyst to produce a polyamine, b) neutralizing the reaction mixture from step a) with a base at a temperature of more than 110° C. or neutralizing the reaction mixture from step a) with a base and heating the neutralized mixture to a temperature of more than 110° C., and c) phosgenating the polyamine from step b) to convert it to the corresponding polyisocyanate.
    Type: Grant
    Filed: August 20, 2002
    Date of Patent: April 13, 2004
    Assignee: Bayer Aktiengesellschaft
    Inventors: Torsten Hagen, Friedhelm Kämper, Daniel Koch, Heinz-Herbert Müller
  • Method for production of diaminodiphenylmethanes
    Patent number: 6649798
    Abstract: The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: November 18, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stephan Klein, Dirk Grotjohann, Christine Mendoza-Frohn, Daniel Koch, Heinz-Herbert Müller, Hans-Georg Pirkl, Rudolf Uchdorf, Gerhard Wegener