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: 4786751
    Abstract: Diisocyanates and isomeric mixtures of diisocyanates corresponding to the formula ##STR1## in which R.sub.1, R.sub.2, R.sub.3, m and n are as defined herein are made by phosgenating diamines corresponding to the formula ##STR2## in which R.sub.1, R.sub.2, R.sub.3, m and n are as defined herein at a temperature of from -20.degree. to 250.degree. C. These diisocyanates are particularly useful as starting materials for the production of polyurethanes by the isocyanate polyaddition process.
    Type: Grant
    Filed: November 12, 1985
    Date of Patent: November 22, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Stefan Penninger, Herbert Stutz
  • Patent number: 4761498
    Abstract: The instant invention is directed to diisocyanates based on diphenylmethane which may be methyl-substituted and which are characterized in particular by isocyanate groups in the 3,4'- and optionally in the 3,2'-position. The instant invention is also directed to a number of independent processes for their production and to their use as isocyanate component in the production of polyurethanes.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: August 2, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Gerhard Wegener
  • Patent number: 4720582
    Abstract: Diamines corresponding to the general formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 may be identical or different and represent hydrogen or straight- or branched-chain C.sub.1 -C.sub.12 alkyl groups, provided that two of the radicals,R.sup.1, R.sup.2 and R.sup.3, represent hydrogen, m and n each represent 0 or 1, provided that m+n=1; where m or n=0, the free valence is saturated by hydrogen, optionally in the form of isomeric mixtures, and optionally containing up to 35%, by weight, of the corresponding perhydrogenated diamines, and up to 10%, by weight, of the corresponding unhydrogenated aromatic diamines.Also, a process for preparing these diamines by catalytically-hydrogenating the corresponding aromatic diamines with 3 moles of hydrogen per mole of diamine, or catalytically-hydrogenating the corresponding dinitro compounds with 9 moles of hydrogen per mole of dinitro compound.
    Type: Grant
    Filed: August 15, 1983
    Date of Patent: January 19, 1988
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt, Stefan Penninger
  • Patent number: 4675437
    Abstract: Cycloaliphatic triisocyanates or isomer mixtures of such triisocyanates corresponding to the formula ##STR1## in which R represents hydrogen or a C.sub.1 -C.sub.4 alkyl group are produced by phosgenating the corresponding cycloaliphatic triamines or isomer mixtures of such triamines or a salt thereof.These triisocyanates are useful in the production of polyisocyanate addition products, particularly polyurethane coatings and lacquers.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: June 23, 1987
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Stefan Penninger, Michael Brockelt, Gunter Hammen, Herbert Stutz
  • Patent number: 4613687
    Abstract: A polyisocyanate or mixture of polyisocyanates in which the main component(s) correspond to the formula: ##STR1## in which R.sub.1, R.sub.2, and R.sub.3 each represent hydrogen or a saturated alkyl group containing from 1 to 12 carbon atoms, provided that at least two of these radicals represent hydrogen; andm, n, o and p each represent 0 or 1, provided that when m, n, o and/or p represent 0, the free valency is taken up by a hydrogen atom and that the sum of m+n+o+p is greater than 1 on a statistical average.Such polyisocyanate or mixture of polyisocyanates may be produced by first reacting a 4-nitrobenzyl halide, a 3-nitrobenzyl halide, a benzyl halide, a benzyl alcohol or a nitrobenzyl chloride isomer mixture with nitrobenzene, an alkyl-substituted nitrobenzene, an alkyl benzene or benzene in the presence of a Friedel-Crafts or an acid catalyst.
    Type: Grant
    Filed: August 17, 1981
    Date of Patent: September 23, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt
  • Patent number: 4603189
    Abstract: Triisocyanates and isomeric mixtures of triisocyanates corresponding to the formula ##STR1## in which R represents hydrogen or an alkyl group having from 1 to 4 carbon atoms are made by phosgenating the corresponding triamine. These triisocyanates are particularly useful in the production of polyurethanes, especially polyurethane lacquer coats.
    Type: Grant
    Filed: April 29, 1985
    Date of Patent: July 29, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Stefan Penninger, Michael Brockelt, Gunter Hammen, Herbert Stutz
  • Patent number: 4587058
    Abstract: A diisocyanate corresponding to the general formula: ##STR1## in which R.sub.1, R.sub.2 and R.sub.3 represent hydrogen or a C.sub.2 -C.sub.12 alkyl group provided that two of the radicals R.sub.1, R.sub.2 and R.sub.3 represent hydrogen and the third represents an alkyl group containing from 2 to 12 carbon atoms. Mixtures of diisocyanates in which the described diisocyanate is a major substituent are also within the scope of this disclosure. Such compounds and mixtures are made by reacting a nitrobenzyl halide, an unsubstituted benzyl halide or a benzyl alcohol in the presence of a Friedel-Crafts catalyst with an alkylbenzene or a nitroalkylbenzene and then converting the nitro groups to amino groups by hydrogenation or reduction. The thus-produced amino compound is then phosgenated to form the diisocyanate.The compounds and mixtures of the present invention are useful in the production of polyurethane plastics.
    Type: Grant
    Filed: August 7, 1981
    Date of Patent: May 6, 1986
    Assignee: Bayer Aktiengesellschaft
    Inventors: Hartmut Knofel, Michael Brockelt