Patents by Inventor Volker Scharr

Volker Scharr 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 preparing methylenedianiline and methylenebis (phenylisocyanate)
    Patent number: 7230130
    Abstract: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.
    Type: Grant
    Filed: May 11, 2004
    Date of Patent: June 12, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckhard Ströfer, Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr, Ulrich Penzel
  • Light isocyanates, method for producing them and use thereof
    Patent number: 6900348
    Abstract: A process is provided for preparing light-colored isocyanates which can be used for preparing urethane compounds, in particular polyurethanes, for example polyurethane foams.
    Type: Grant
    Filed: June 16, 2000
    Date of Patent: May 31, 2005
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Reif, Peter van den Abeel, Filip Nevejans, Hans Volkmar Schwarz, Ulrich Penzel, Volker Scharr
  • Process for preparing methylenedianiline and methylenebis (phenylisocyanate)
    Publication number: 20050014975
    Abstract: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.
    Type: Application
    Filed: May 11, 2004
    Publication date: January 20, 2005
    Inventors: Eckhard Strofer, Jan Jacobs, Wilfried Seyfert, Hans Schwarz, Olaf Schweers, Volker Scharr, Ulrich Penzel
  • Process for preparing methylenedianiline and methylenebis(phenyl isocyanate)
    Patent number: 6831192
    Abstract: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.
    Type: Grant
    Filed: May 21, 2002
    Date of Patent: December 14, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckhard Ströfer, Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr, Ulrich Penzel
  • METHOD FOR PRODUCING MIXTURES CONSISTING OF DIPHENYLMETHANE DIISOCYANATES AND POLYPHENYLENE-POLYMETHYLENE-POLYISOCYANATES CONTAINING A REDUCED AMOUNT OF CHLORINATED SECONDARY PRODUCTS AND WITH A REDUCED IODINE COLOR INDEX
    Patent number: 6576788
    Abstract: In a process for preparing mixtures of diphenylmethane diisocyanates and polyphenylpolymethylene polyisocyanates having a reduced content of chlorinated by-products and a reduced iodine color number by two-stage reaction of the corresponding mixtures of diphenylmethanediamines and polyphenylpolymethylenepolyamines with phosgene in the presence of at least one inert organic solvent at elevated temperature, separation of the excess phosgene and solvent after the phosgenation is complete and thermal treatment of the reaction product, the mass ratios of phosgene to hydrogen chloride in the residence time apparatus of the second stage of the phosgenation are at the same time 10-30:1 in the liquid phase and 1-10:1 in the gas phase.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: June 10, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Ulrich Penzel, Volker Scharr, Dieter Starosta, Hilmar Boesel, Eckhard Ströfer, Joachim Pfeffinger, Frank Poplow, Jürgen Dosch, Hans Volkmar Schwarz, Fritz Näumann, Peter van den Abeel, Jan Jacobs, Filip Nevejans, Willy van Pee
  • Process for preparing methylenedianiline and methylenebis(phenyl isocyanate)
    Publication number: 20020132953
    Abstract: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C.
    Type: Application
    Filed: May 21, 2002
    Publication date: September 19, 2002
    Applicant: BASF Aktiengesellschaft
    Inventors: Eckhard Strofer, Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr, Ulrich Penzel
  • Method for the production of methylenedi(phenylamine and methylenedi(phenyl isocyanate)
    Patent number: 6433219
    Abstract: A process for preparing methylenedianiline by reacting aniline with formaldehyde in the presence of acid catalysts comprising, in a semicontinuous process, introducing aniline with or without acid catalyst, feeding formaldehyde with or without acid catalyst through a mixing element into a circuit in which aniline with or without acid catalyst and with or without previously added formaldehyde is circulated and, after feeding in at least 50% of the total amount of formaldehyde to be fed in, heating the reaction mixture to a temperature above 75° C. In addition, the invention relates to a process for preparing polyisocyanates by phosgenation of amines obtainable in this manner and to the polyisocyanates obtainable by this process.
    Type: Grant
    Filed: September 8, 2000
    Date of Patent: August 13, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckhard Ströfer, Jan Jacobs, Wilfried Seyfert, Hans Volkmar Schwarz, Olaf Schweers, Volker Scharr, Ulrich Penzel