Patents by Inventor Michael Brockelt

Michael Brockelt 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: 7790804
    Abstract: The invention provides a process for the purification of polymer polyols that ensures a reduction of acrylonitrile, styrene as well as the residual amounts of optionally used chain regulator, and of occurring recombination products of the initiator when azo initiators are used, to levels of <25 ppm of acrylonitrile, <50 ppm styrene, <50 ppm chain regulator and <280 ppm of recombination products by stripping using packed columns.
    Type: Grant
    Filed: June 22, 2007
    Date of Patent: September 7, 2010
    Assignee: Bayer MaterialScience AG
    Inventors: Michael Brockelt, Ludwig Deibele, Manfred Dietrich, Markus Hadley, Jan Thomas Leu, Guido Naberfeld, Ralf Dohrn
  • Publication number: 20080033139
    Abstract: The invention relates to a process for the purification of polymer polyols by stripping using packed columns.
    Type: Application
    Filed: June 22, 2007
    Publication date: February 7, 2008
    Inventors: Michael Brockelt, Ludwig Deibele, Manfred Dietrich, Markus Hadley, Jan Leu, Guido Naberfeld, Ralf Dohrn
  • Patent number: 7141613
    Abstract: The invention relates to flame resistant rigid foams and formulations useful for the production thereof. The polyol formulation must include at least one substance which is inert with respect to isocyanates, does not deplete the ozone layer and has a boiling point below 55° C. and a reaction product of at least one compound with an aromatic ring, at least one aldehyde or ketone and at least one primary or secondary amine. This polyol formulation is reacted with an isocyanate, optionally with other commonly used additives, to produce rigid flame resistant foams.
    Type: Grant
    Filed: March 10, 2003
    Date of Patent: November 28, 2006
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rolf Albach, Michael Brockelt, Juan Cirujeda-Ranzenberger
  • Publication number: 20030225174
    Abstract: The invention relates to flame resistant rigid foams and formulations useful for the production thereof. The polyol formulation must include at least one substance which is inert with respect to isocyanates, does not deplete the ozone layer and has a boiling point below 55° C. and a reaction product of at least one compound with an aromatic ring, at least one aldehyde or ketone and at least one primary or secondary amine. This polyol formulation is reacted with an isocyanate, optionally with other commonly used additives, to produce rigid flame resistant foams.
    Type: Application
    Filed: March 10, 2003
    Publication date: December 4, 2003
    Inventors: Rolf Albach, Michael Brockelt, Juan Cirujeda-Ranzenberger
  • Patent number: 6472447
    Abstract: The present invention relates to finely dispersed, low-viscosity polymer polyols which are stabilized in a novel manner and which are characterized by a high content of polystyrene or polystyrene copolymers. This invention also relates to the preparation of such polymer polyols, and their use for the preparation of polyurethane materials.
    Type: Grant
    Filed: January 20, 2000
    Date of Patent: October 29, 2002
    Inventors: Klaus Lorenz, Manfred Dietrich, Michael Brockelt, Uwe Scholz, Robert-Joseph Kumpf, Jürgen Grönen, Gundolf Jacobs
  • Publication number: 20020077452
    Abstract: The present invention provides an improved process for the continuous filtration of filled polyols containing deformable solid particles, wherein filtration of the filled polyols is performed with dynamic pressure disc filters.
    Type: Application
    Filed: December 17, 2001
    Publication date: June 20, 2002
    Inventors: Arne Braun, Michael Brockelt, Manfred Dietrich, Hans-Jurgen Klocke, Matthias Wohak, Uwe Klingler
  • Patent number: 5684180
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: November 4, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5679840
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and their use.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: October 21, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5679841
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and the use thereof.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: October 21, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5675035
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to their use.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: October 7, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5672737
    Abstract: The invention relates to a process for the fractionation and purification of mixtures of aromatic polyamines and to the use thereof.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: September 30, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5663424
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and the use thereof.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: September 2, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5648519
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and to the use thereof.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: July 15, 1997
    Assignee: Bayer Aktiengesesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5648520
    Abstract: The invention relates to a process for the fractionation and purification of aromatic polyamine mixtures and the use thereof.
    Type: Grant
    Filed: March 28, 1996
    Date of Patent: July 15, 1997
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 5359141
    Abstract: The invention relates to an improved process for the production of polynuclear aromatic polyamines by condensation of aniline with formaldehyde in the presence of water and acidic catalysts and working up of the reaction mixture by extraction with a hydrophobic solvent, the acid catalyst accumulating in the aqueous phase of the extraction step being reused.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: October 25, 1994
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Marcel Petinaux, Rudolf Uchdorf, Hans-Peter Schal
  • Patent number: 5196591
    Abstract: The invention relates to an improved process for the production of polynuclear aromatic polyamines by condensation of aniline with formaldehyde in the presence of water and acidic catalysts and working up of the reaction mixture by extraction with a hydrophobic solvent, the acid catalyst accumulating in the aqueous phase of the extraction step being reused.
    Type: Grant
    Filed: April 6, 1992
    Date of Patent: March 23, 1993
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Marcel Petinaux, Rudolf Uchdorf, Hans-Peter Schal
  • Patent number: 4924028
    Abstract: This invention relates to an improved process for the preparation of polynuclear aromatic polyamines in which the reaction product is prepared by condensing aniline with formaldehyde in the presence of water and acidic catalysts and is worked up by extraction with a hydrophobic solvent. The acid catalyst that accumulates in the aqueous phase during the extraction process is reused.
    Type: Grant
    Filed: April 6, 1989
    Date of Patent: May 8, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Marcel Petinaux, Rudolf Uchdorf
  • Patent number: 4914236
    Abstract: The present invention relates to an improved process for the preparation of multinuclear aromatic polyamines by the condensation of aniline with formaldehyde in the presence of water and acid catalysts and working up of the reaction mixture by extraction with a hydrophobic solvent. The acid catalyst obtained in the aqueous phase of extraction is reused.
    Type: Grant
    Filed: April 25, 1988
    Date of Patent: April 3, 1990
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Marcel Petinaux, Rudolf Uchdorf
  • Patent number: 4879408
    Abstract: Diisocyanates and isomer mixtures of diisocyanates corresponding to the formula ##STR1## in which R.sup.1, R.sup.2, m and n are as defined herein are produced by phosgenating diamines and isomer mixtures of diamines corresponding to the formula ##STR2## in which R.sup.1, R.sup.2, m and n are as defined herein. These diisocyanates which are liquid at room temperature and highly compatible with polyols are particularly useful in the production of polyurethanes.
    Type: Grant
    Filed: April 7, 1987
    Date of Patent: November 7, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Stefan Penninger, Herbert Stutz
  • Patent number: 4879409
    Abstract: A diisocyanate corresponding to the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.3, m and n are as defined herein is prepared by phosgenating a diamine corresponding to the formula ##STR2## in which R.sup.1, R.sup.2, R.sup.3, m and n are as defined herein. The diisocyanate may contain C.sub.1 -C.sub.12 -monoalkyl-substituted methylene-bis-(cyclohexylisocyanate)isomers in an amount of up to 40 wt. %. These new diisocyanates which are liquid at room temperature and compatible with polyols are particularly useful in the production of polyurethanes.
    Type: Grant
    Filed: April 7, 1987
    Date of Patent: November 7, 1989
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Stefan Penninger, Herbert Stutz