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).
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Patent number: 5462810Abstract: 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: GrantFiled: January 11, 1994Date of Patent: October 31, 1995Assignee: BASF Magnetics GmbHInventors: Harald Keller, Ulrich Jaeger, Helmut Steininger, Helmut Kopke, Klaus D. Schomann, Hans-Peter Schildberg
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Patent number: 5169721Abstract: 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: GrantFiled: August 23, 1990Date of Patent: December 8, 1992Assignee: BASF AktiengesellschaftInventors: Michael Bobrich, August Lehner, Albert Kohl, Rudolf Suettinger, Uwe Keppeler, Werner Lenz, Roller Hermann, Helmut Kopke, Guenther Schulz
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Patent number: 5120608Abstract: 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: GrantFiled: August 23, 1990Date of Patent: June 9, 1992Assignee: BASF AktiengesellschaftInventors: Michael Bobrich, August Lehner, Albert Kohl, Rudolf Suettinger, Uwe Keppeler, Werner Lenz, Hermann Roller, Helmut Kopke, Guenther Schulz
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Patent number: 5064721Abstract: 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: GrantFiled: October 31, 1988Date of Patent: November 12, 1991Assignee: BASF AktiengesellschaftInventors: August Lehner, Albert Kohl, Hermann Roller, Werner Lenz, Ludwig Kreitner, Helmut Kopke, Friedrich Sommermann, Ernst Ricker
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Patent number: 4568610Abstract: 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: GrantFiled: November 19, 1984Date of Patent: February 4, 1986Assignee: BASF AktiengesellschaftInventors: August Lehner, Werner Balz, Milan Velic, Helmut Kopke, Werner Grau, Reinhold Baur
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Patent number: 4568612Abstract: 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: GrantFiled: July 20, 1983Date of Patent: February 4, 1986Assignee: BASF AktiengesellschaftInventors: August Lehner, Werner Balz, Werner Lenz, Helmut Kopke, Rudolf Bachmann, Milan Velic, Milena Melzer, Heinrich Hartmann, Reinhold Baur
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Patent number: 4567109Abstract: 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: GrantFiled: July 20, 1983Date of Patent: January 28, 1986Assignee: BASF AktiengesellschaftInventors: August Lehner, Milan Velic, Helmut Kopke, Werner Balz, Werner Lenz, Reinhold Baur, Milena Melzer
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Patent number: 4567108Abstract: 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: GrantFiled: November 19, 1984Date of Patent: January 28, 1986Assignee: BASF AktiengesellschaftInventors: August Lehner, Helmut Kopke, Hermann Roller, Werner Balz, Werner Grau, Eberhard Koester, Friedrich Sommermann
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Patent number: 4430362Abstract: 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: GrantFiled: December 16, 1982Date of Patent: February 7, 1984Assignee: BASF AktiengesellschaftInventors: Milena Melzer, Norbert Schneider, Helmut Kopke, Klaus Schoettle, Eberhard Koester, Werner Balz, Werner Grau
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Patent number: 4320171Abstract: 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: GrantFiled: May 19, 1980Date of Patent: March 16, 1982Assignee: BASF AktiengesellschaftInventors: Herbert Motz, August Lehner, Heinrich Hartmann, Rudolf Bachmann, Hans-Joerg Hartmann, Harald Frischmann, Roland Falk, Joachim Hack, Milan Velic, Helmut Kopke
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Patent number: 4091143Abstract: 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: GrantFiled: October 22, 1975Date of Patent: May 23, 1978Assignee: BASF AktiengesellschaftInventors: Hans Joerg Hartmann, Guenter Vaeth, Helmut Kopke
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Patent number: 4059716Abstract: 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: GrantFiled: June 12, 1975Date of Patent: November 22, 1977Assignee: BASF AktiengesellschaftInventors: Helmut Kopke, Manfred Ohlinger, Werner Grau, Eduard Schoenafinger, Hans Henning Schneehage
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Patent number: 4005242Abstract: 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: GrantFiled: December 23, 1974Date of Patent: January 25, 1977Assignee: BASF AktiengesellschaftInventors: Helmut Kopke, Hans-Joerg Hartmann, Dieter Mayer, Herbert Motz