Patents by Inventor Stefan Groth

Stefan Groth 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: 6288198
    Abstract: The present invention relates to hybrid coating compositions containing A) 5 to 80 wt %, based on the weight of A) and B), of an aliphatic polyisocyanate-aminosilane adduct that is the reaction product of A1) a polyisocyanate component having an average NCO functionality of 2.5 to 5.5 and an isocyanate content, based on solids, of 9 to 50 wt % and containing aliphatic polyisocyanates with A2) at least 0.
    Type: Grant
    Filed: November 24, 1999
    Date of Patent: September 11, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Markus Mechtel, Stefan Groth, Lutz Schmalstieg
  • Patent number: 6281322
    Abstract: The present invention relates to coating compositions containing 40 to 100% by weight, based on resin solids, of an alkoxysilyl-functional polyisocyanate polyurea which is reaction product of A) a polyisocyanate component having an average functionality of 2.5 to 5.5, an NCO content of 11.0 to 20.0% by weight and a monomeric diisocyanate content of less than 10% by weight, and containing at least 50% by weight of a polyisocyanate prepared from 4,4′-diisocyanatodicyclohexyl-methane with B) at least 0.7 equivalents, based on the equivalents of isocyanate groups, of an aminosilane corresponding to formula (I) (RO)nY(3−n)Si—CH2CH2CH2—NHZ  (I),  wherein R represents methyl or ethyl, Y represents methyl, Z represents H, a C1-C12 alkyl or CH2CH2CH2—Si(OR)nY3−n, and n is 1, 2 or 3, and C) optionally other isocyanate-reactive compounds.
    Type: Grant
    Filed: December 1, 1999
    Date of Patent: August 28, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stefan Groth, Reinhard Halpaap, Markus Mechtel, Lutz Schmalstieg, Philip E. Yeske
  • Patent number: 6107484
    Abstract: The present invention relates to a process for the production of trimerized polyisocyanates containing at least 30 mole % of iminooxadiazinedione groups (asymmetric trimers) in the trimer mixture by catalytically trimerizing a starting isocyanate selected from organic di- or polyisocyanates having a number average molecular weight of 140 to 600 and containing aliphatically, cycloaliphatically and/or araliphatically bound isocyanate groups in the presence of quaternary ammonium and phosphonium fluoride trimerization catalysts corresponding to the formulaR.sub.4 E.sup.+ F.sup.- (I),whereinE represents N or P andR represents identical or different, optionally branched, aliphatic, aromatic and/or araliphatic C.sub.1 -C.sub.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: August 22, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Frank Richter, Stefan Groth, Eberhard Stelter, Wilfried Litz
  • Patent number: 6090939
    Abstract: The present invention relates to a process for the preparation of trimerized polyisocyanates that contain at least 30 mole % of iminooxadiazinedione groups (asymmetric trimers) in the trimer mixture, by catalytically trimerizing a starting isocyanate selected from organic di- or polyisocyanates having a number average molecular weight of 140 to 600 and containing aliphatically, cycloaliphatically and/or araliphatically bound isocyanate groups in the presence of a quaternary phosphonium polyfluoride trimerization catalyst corresponding to the formulaR.sub.4 P.sup.+ F.sup.- n(HF)whereinR represents identical or different, optionally branched aliphatic, aromatic and/or araliphatic C.sub.1 -C.sub.20 groups, or two or more R groups may also form, with one another and with the phosphorus atom, saturated or unsaturated rings andn has a value of 0.1 to 20.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: July 18, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Frank Richter, Eberhard Stelter, Wilfried Litz, Stefan Groth
  • Patent number: 6020419
    Abstract: The present invention relates to transparent coating compositions containing a binder and 0.5 to 25 wt. %, based on resin solids, of a material consisting of nanoscale primary particles obtained by jet dispersion of the nanoscale particles in the coating composition. The present invention also relates to a process for the production of these transparent coating compositions containing nanoscale particles by passing the coating compositions containing nanoscale primary particles and a binder in at least one pass through an apparatus which has at least one nozzle or at least one slit having a bore diameter or slit width of 0.05 to 1 mm and a length to diameter ratio of the bore or a depth to slit width ratio of the slit of 1 to 10, wherein there is a pressure differential between the nozzle inlet and outlet of at least 0.5, preferably of 1 MPa.
    Type: Grant
    Filed: March 16, 1999
    Date of Patent: February 1, 2000
    Assignee: Bayer Aktiengesellschaft
    Inventors: Manfred Bock, Theodor Engbert, Stefan Groth, Bernd Klinksiek, Philip Yeske, Gerhard Jonschker, Ulrike Dellwo
  • Patent number: 5998504
    Abstract: The present invention relates to colloidal metal oxides having blocked isocyanate groups, which are based on the reaction product ofA) blocked isocyanate group-containing silanes corresponding to formula (I) ##STR1## wherein R represents hydrogen or an organic group having 1 to 40 carbon atoms,X, Y and Z represent identical or different organic groups having 1 to 30 carbon atoms which are inert to isocyanate groups below 100.degree. C., provided that at least one of these groups is a C.sub.1 -C.sub.4 -alkoxy group,Q represents an organic group which contains at least one isocyanate group reacted with a blocking agent andn is 2, 3 or 4 withB) colloidal metal oxides selected from Al, Si, Ti, Ta, W, Hf, Zr, Sn and Y.The present invention also relates to the use of modified metal oxides, either alone or in combination with compounds containing at least two isocyanate-reactive groups, for the preparation of optionally expanded polyurethane plastics, lacquers or coating agents.
    Type: Grant
    Filed: April 3, 1998
    Date of Patent: December 7, 1999
    Assignee: Bayer Aktiengesellschaft
    Inventors: Stefan Groth, Claus Kobusch, Lutz Schmalstieg, Lothar Puppe, Theodor Engbert, Manfred Bock, Gerhard Jonschker