Patents by Inventor Helmut Kopke

Helmut Kopke 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: 5462810
    Abstract: A magnetic recording medium comprises a nonmagnetic substrate and at least one ferromagnetic metal layer applied thereon and a protective layer formed on this metal layer and consisting of a compound which consists of an unfluorinated or partially fluorinated alkyl radical and a disulfide, hydroxyl or keto group.
    Type: Grant
    Filed: January 11, 1994
    Date of Patent: October 31, 1995
    Assignee: BASF Magnetics GmbH
    Inventors: Harald Keller, Ulrich Jaeger, Helmut Steininger, Helmut Kopke, Klaus D. Schomann, Hans-Peter Schildberg
  • Patent number: 5169721
    Abstract: Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder, not less than 50% by weight of the binder consisting of a high molecular weight branched polyurethane elastomer having OH-containing urea groups at the chain ends, and the frictional properties of the binder being improved and its coefficient of friction reduced by incorporation of perfluoro groups.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: December 8, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Bobrich, August Lehner, Albert Kohl, Rudolf Suettinger, Uwe Keppeler, Werner Lenz, Roller Hermann, Helmut Kopke, Guenther Schulz
  • Patent number: 5120608
    Abstract: Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder which may be crosslinked with a polyisocyanate, not less than 50% by weight of the binder consisting of a low molecular weight branched polyurethane having OH-containing urea groups at the chain ends, and the frictional properties of the binder being improved and its friction reduced by the incorporation of perfluoro groups.
    Type: Grant
    Filed: August 23, 1990
    Date of Patent: June 9, 1992
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Bobrich, August Lehner, Albert Kohl, Rudolf Suettinger, Uwe Keppeler, Werner Lenz, Hermann Roller, Helmut Kopke, Guenther Schulz
  • Patent number: 5064721
    Abstract: Magnetic recording media consist of a nonmagnetic base and at least one matnetizable layer which is firmly applied thereon and is based on a magnetic material finely dispersed in a binder, consisting of not less than 50% by weight of a polyurethane, and further conventional additives, wherein the magnetizable layer also contains a saturated, branched hydrocarbon.
    Type: Grant
    Filed: October 31, 1988
    Date of Patent: November 12, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Albert Kohl, Hermann Roller, Werner Lenz, Ludwig Kreitner, Helmut Kopke, Friedrich Sommermann, Ernst Ricker
  • Patent number: 4568612
    Abstract: Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer which consists of a dispersion of an anisotropic magnetic material in an organic binder which consists essentially of an OH-containing polyurea-urethane binder crosslinked with polyisocyanate. The OH-containing polyurea-urethane is obtained by reacting a polydiol, a diol and a primary or secondary aminoalcohol, and if appropriate a triol, with a diisocyanate.
    Type: Grant
    Filed: July 20, 1983
    Date of Patent: February 4, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Werner Balz, Werner Lenz, Helmut Kopke, Rudolf Bachmann, Milan Velic, Milena Melzer, Heinrich Hartmann, Reinhold Baur
  • Patent number: 4568610
    Abstract: Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) an OH-containing polyurethane which is crosslinked with polyisocyanates, (2) a high molecular weight thermoplastic linear polyurethane and (3) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: February 4, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Werner Balz, Milan Velic, Helmut Kopke, Werner Grau, Reinhold Baur
  • Patent number: 4567109
    Abstract: Magnetic recording media comprising a non-magnetic base which is provided with a magnetic layer which consists essentially of a dispersion of an anisotropic magnetic material in a mixture of an OH-containing polyurea-urethane binder, which is crosslinked with a polyisocyanate, with a physically drying binder.
    Type: Grant
    Filed: July 20, 1983
    Date of Patent: January 28, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Milan Velic, Helmut Kopke, Werner Balz, Werner Lenz, Reinhold Baur, Milena Melzer
  • Patent number: 4567108
    Abstract: Magnetic recording media comprise a non-magnetic base which is provided with a magnetic layer consisting of finely divided anisotropic magnetic material which is dispersible in binders and additives, the binder being a mixture of (1) a high molecular weight thermoplastic linear polyurethane, (2) a polyvinylformal binder, a phenoxy resin, a cellulose ester or a vinyl chloride copolymer and (3) an OH-containing polyurethane which is crosslinked with polyisocyanates.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: January 28, 1986
    Assignee: BASF Aktiengesellschaft
    Inventors: August Lehner, Helmut Kopke, Hermann Roller, Werner Balz, Werner Grau, Eberhard Koester, Friedrich Sommermann
  • Patent number: 4430362
    Abstract: Magnetic recording media are produced by a method wherein a fluid dispersion of finely divided magnetically anisotropic material in a film-forming binder mixture containing a polyurethane (obtained from a polyester which possesses free hydroxyl groups, and a di- or polyisocyanate) is applied to a non-magnetic base and the magnetic layer is then hardened.
    Type: Grant
    Filed: December 16, 1982
    Date of Patent: February 7, 1984
    Assignee: BASF Aktiengesellschaft
    Inventors: Milena Melzer, Norbert Schneider, Helmut Kopke, Klaus Schoettle, Eberhard Koester, Werner Balz, Werner Grau
  • Patent number: 4320171
    Abstract: Magnetic recording media comprising a non-magnetic base and, applied thereto, a firmly adhering magnetic coating based on a finely divided magnetic pigment dispersed in a binder which contains at least 50 percent by weight of a special polyurethane elastomer, namely a thermoplastic polyurethane which is soluble in tetrahydrofuran, is free from isocyanate groups and has been manufactured from (A) 1 mole of a hydroxyl-containing polyester having a molecular weight of from 700 to 2,500, (B) from 0.3 to 3 moles of a linear aliphatic diol of 2 to 10 carbon atoms, (C) from 0.05 to 0.4 mole of a triol of 3 to 10 carbon atoms, and (D) from 1.35 to 4.7 moles of a diisocyanate of 6 to 30 carbon atoms, the amount of NCO groups being approximately equivalent to the amount of OH groups of the sum of components (A) to (C).
    Type: Grant
    Filed: May 19, 1980
    Date of Patent: March 16, 1982
    Assignee: BASF Aktiengesellschaft
    Inventors: Herbert Motz, August Lehner, Heinrich Hartmann, Rudolf Bachmann, Hans-Joerg Hartmann, Harald Frischmann, Roland Falk, Joachim Hack, Milan Velic, Helmut Kopke
  • Patent number: 4091143
    Abstract: Magnetic recording media, the magnetic coating of which consists of a dispersion of elongated ferromagnetic chromium dioxide particles in an organic binder, the dispersions exhibiting particularly good storage stability. This is achieved by admixing 0.5 to 6% by weight, based on the amount of chromium dioxide pigment, of the zinc salt of an aliphatic carboxylic acid of 8 to 18 carbon atoms, during the manufacture of the chromium dioxide dispersions. Chromium dioxide dispersions with good storage stability and a high degree of orientation of the elongated magnetic particles in the magnetic coating are thus obtained in a simple manner.
    Type: Grant
    Filed: October 22, 1975
    Date of Patent: May 23, 1978
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Joerg Hartmann, Guenter Vaeth, Helmut Kopke
  • Patent number: 4059716
    Abstract: A process for the manufacture of acicular gamma-iron(III) oxide which, because of its improved dispersibility in organic binders, is suitable for the manufacture of magnetic recording media exhibiting a particularly high orientation ratio. For this purpose, the non-magnetic acicular .alpha.-iron(III) oxide or goethite pigment is treated with from 0.5 to 10% by weight, based on the pigment, of a compound of the formula I: ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are hydrogen, alkyl of 1 to 24 carbon atoms or alkenyl of 1 to 24 carbon atoms and (RX).sup.- is selected from the group consisting of an aliphatic carboxylic acid of 1 to 18 carbon atoms, an aromatic carboxylic acid of 1 to 18 carbon atoms, a sulfonic acid and an ester of phosphoric acid and is then further processed by conventional methods to give gamma-iron(III) oxide.
    Type: Grant
    Filed: June 12, 1975
    Date of Patent: November 22, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Kopke, Manfred Ohlinger, Werner Grau, Eduard Schoenafinger, Hans Henning Schneehage
  • Patent number: 4005242
    Abstract: A magnetic recording medium consists of a non-magnetic base, on which the magnetic coating is a layer of a dispersion, containing a lubricant, of a magnetic pigment in a polymeric binder. The lubricant is a block copolymer which contains siloxane units and alkyleneoxy units of 2 to 4 carbon atoms, the alkyleneoxy units being bonded to the polysiloxane radical through a Si--O--C or Si--C group. The use of this lubricant gives a magnetic recording medium which has the advantages of good fluid lubrication and an excellent coefficient of friction which does not vary with time.
    Type: Grant
    Filed: December 23, 1974
    Date of Patent: January 25, 1977
    Assignee: BASF Aktiengesellschaft
    Inventors: Helmut Kopke, Hans-Joerg Hartmann, Dieter Mayer, Herbert Motz