Patents by Inventor Hermann Roller
Hermann Roller 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: 5543226Abstract: Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer bonded thereon and based on a magnetic material dispersed in at least one polyurethane and one polyurethaneurea (meth)acrylate, the polyurethaneurea (meth)acrylate being obtained by reacting a hydroxyl-containing poly(meth)acrylate with a mixture of di- and polyisocyanates and converting the remaining NCO groups with ammonia or primary or secondary amines into urea groups.Type: GrantFiled: December 18, 1992Date of Patent: August 6, 1996Assignee: BASF Magnetics GmbHInventors: Michael Bobrich, August Lehner, Hermann Roller, Rudolf Suettinger, Ria Kress, Norbert Schneider, Werner Lenz, Peter Engelhardt, Peter Rudolf, Gregor Brodt, Werner Balz, Albert Kohl
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Patent number: 5470650Abstract: Magnetic recording media are obtained by preparing a dispersion of anisotropic magnetic material and conventional additives in a solution of a polymeric binder in an organic solvent, applying the dispersion as a layer to a nonmagnetizable substrate, then orienting the anisotropic magnetic material in a magnetic field and solidifying the applied magnetic layer, the magnetic layer containing finely divided organic, hydrophobic supporting pigments and a highly viscous polysiloxane.Type: GrantFiled: August 17, 1993Date of Patent: November 28, 1995Assignee: Basi Magnetics GmbHInventors: August Lehner, Norbert Schneider, Hermann Roller, Werner Balz, Werner Lenz, Albert Kohl
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Patent number: 5419959Abstract: Flexible magnetic recording media consisting essentially of a web-like nonmagnetic substrate, a magnetic layer applied to one main side of the web-like substrate and a backing layer formed on the opposite main side of the substrate from a polymeric binder, at least one filler, at least one auxiliary pigment and a polyolefin having a spherical particle shape.Type: GrantFiled: February 18, 1994Date of Patent: May 30, 1995Assignee: BASF Magnetics GmbHInventors: Hermann Roller, Peter Heilmann, Michael Hitzfeld, Dieter Stockburger, Werner Latzel, Reinhold Baur, Peter Engelhardt, Edwin Rothfuss, Werner Grau, Werner Lenz
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Patent number: 5346761Abstract: In flexible magnetic recording media consisting essentially of a web-like nonmagnetic substrate, the magnetic layer is applied to one main side of the web-like substrate and a backing coating formed on the opposite main side of the substrate from a polymeric binder and nonmagnetic fillers as well as supporting pigments, the backing coating contains a precipitated silica treated on the surface with a phosphate-containing polyurethane.Type: GrantFiled: May 14, 1993Date of Patent: September 13, 1994Assignee: BASF Magnetics GmbHInventors: Hermann Roller, Peter Engelhardt, Reinhold Baur, Michael Bobrich, Werner Latzel, Werner Lenz, Rudolf Suettinger
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Patent number: 5330784Abstract: Flexible magnetic recording media essentially consist of a web-like nonmagnetic substrate, a magnetic layer applied to one main side of the web-like substrate and a backing coating formed on the opposite main side of the substrate from a polymeric binder and nonmagnetizable fillers and supporting pigments.Type: GrantFiled: November 4, 1993Date of Patent: July 19, 1994Assignee: BASF Magnetics GmbHInventors: Michael Bobrich, Gregor Brodt, Hermann Roller
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Patent number: 5217810Abstract: Magnetic recording media consisting of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a magnetic material which essentially consists of ferromagnetic chromium dioxide and is finely dispersed in a polymer binder and further conventional additives are distinguished by a particular stability to the chemical decomposition due to moisture and oxidizable compounds and hence particular stability to the deterioration in the magnetic properties, as a result of the addition of from 0.1 to 8% by weight, based on the amount of chromium dioxide, of a monomeric, polyunsaturated, organic compound to the magnetic layer.Type: GrantFiled: March 19, 1992Date of Patent: June 8, 1993Assignee: BASF AktiengesellschaftInventors: August Lehner, Rudolf Suettinger, Michael Bobrich, Hermann Dikow, Hermann Roller, Werner Lenz, Ludwig Kreitner, Werner Loch, Norbert Schneider
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Patent number: 5130202Abstract: Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is applied firmly thereon and is based on a polyurethane binder, not less than 50% by weight of binder consisting of a branched polyurethane elastomer having urea groups at the chain ends.Type: GrantFiled: August 13, 1990Date of Patent: July 14, 1992Assignee: BASF AktiengesellschaftInventors: Uwe Keppeler, Michael Bobrich, Guenter Heil, Hermann Roller, August Lehner, Werner Lenz, 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: 5085889Abstract: Magnetic recording media are produced by dispersion of powdered magnetic material in a mixture of solvents, organic polymer binders, dispersants and further conventional additives in a stirred ball mill and subsequent aftertreatment in a ball mill containing grinding media, application of the resulting dispersion as a layer to a substrate and subsequent consolidation of the layer.Type: GrantFiled: March 16, 1990Date of Patent: February 4, 1992Assignee: BASF AktiengesellschaftInventors: Horst Platz, Peter Engelhardt, Friedrich Sommermann, Albert Kohl, Juergen Klausmann, Reinhold Baur, Peter Heilmann, Hermann Roller
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Patent number: 5082737Abstract: 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 polyisocyanate, not less than 50% by weight of the binder consisting of a low molecular weight branched polyureaurethane having OH-containing urea groups at the chain ends, and the sliding properties of the said binder being improved and its coefficient of friction reduced by incorporation of siloxane groups.Type: GrantFiled: August 23, 1990Date of Patent: January 21, 1992Assignee: BASF AktiengesellschaftInventors: Michael Bobrich, Hermann Roller, August Lehner, Uwe Keppeler, Rudolf Suettinger, Werner Loch, Werner Lenz, Guenther Schulz
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Patent number: 5075179Abstract: Magnetic recording media consist of a nonmagnetic substrate and one or more magnetizable layers which are firmly applied thereon and are based on a magnetic material which is finely dispersed in a polymer binder and further conventional additives and essentially consists of ferromagnetic chromium dioxide, and the said recording media are particularly stable to the chemical decomposition due to moisture and oxidizable compounds and hence to deterioration in the magnetic properties, owing to the addition of from 0.1 to 8% by weight of an organic compound from the group consisting of the antioxidants, based on the amount of chromium dioxide, to the magnetic layer.Type: GrantFiled: December 12, 1989Date of Patent: December 24, 1991Assignee: BASF AktiengesellschaftInventors: August Lehner, Rudolf Suettinger, Michael Bobrich, Hermann Dikow, Hermann Roller, Werner Lenz, Ludwig Kreitner, Werner Loch, Norbert Schneider
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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: 4895764Abstract: In magnetic recording media consisting of a nonmagnetic base and, firmly applied to this, one or more magnetic layers based on a magnetic material finely dispersed in organic binders, the binder consists of not less than 50% by weight of a high molecular weight branched polyurethane elastomer possessing OH-containing urea groups at the chain ends.Type: GrantFiled: February 26, 1988Date of Patent: January 23, 1990Assignee: BASF AktiengesellschaftInventors: August Lehner, Albert Kohl, Michael Bobrich, Hermann Roller, Peter Richter, Werner Lenz, Ludwig Kreitner, Peter Rudolf
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Patent number: 4775553Abstract: Magnetic recording media are produced by dispersing pulverulent magnetic material in a mixture of a solvent, an organic polymer binder, a dispersant and other conventional additives, with the aid of a conventional dispersing apparatus and using a particular ceramic grinding medium, applying the resulting dispersion in the form of a layer on a base and then compacting the layer.Type: GrantFiled: July 22, 1986Date of Patent: October 4, 1988Assignee: BASF AktiengesellschaftInventors: Jenoe Kovacs, Peter Engelhardt, Hermann Roller, Lothar Schwarz, Peter Nagel
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Patent number: 4656093Abstract: Magnetic recording media consisting of a non-magnetic base and, applied thereto, one or more firmly adhering magnetizable layers based on magnetic material finely dispersed in a polymeric binder, at least one lubricant and other conventional additives, wherein the lubricant used is a mixture of zinc stearate which has been rendered hydrophilic and stearylamide.Type: GrantFiled: December 24, 1984Date of Patent: April 7, 1987Assignee: Basf AktiengesellschaftInventors: August Lehner, Albert Kohl, Hermann Roller, Werner Balz, Eerhard Koester, Friedrich Sommermann
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Patent number: 4645723Abstract: A process for the production of magnetic recording media by applying a magnetic layer, which consists essentially of magnetic material finely dispersed in organic polymers, to one side of a flexible base, and applying a non-magnetizable backing coating which is free of inorganic solids to that side of the base which is opposite the magnetic layer, wherein the backing coating consists of two or more polymers which are incompatible with one another and have precipitated from a solvent mixture, and magnetic recording media produced by this process.Type: GrantFiled: February 15, 1985Date of Patent: February 24, 1987Assignee: BASF AktiengesellschaftInventors: Milena Melzer, Hermann Roller, Norbert Schneider, Horst Fitterer, Wulf Munzner
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Patent number: 4597990Abstract: A process for the preparation of a magnetic recording medium by dispersing pulverulent magnetic material in a binder mixture which is dissolved in an organic solvent and essentially consists of an elastomeric polyurethane and a high molecular weight hydroxyl-containing polymer, with addition of dispersing assistants and conventional additives, applying a layer of the dispersion, to which a diisocyanate and/or polyisocyanate has first been added, to a base material and the solidifying the layer and crosslinking the binder matrix, wherein the diisocyanate and/or polyisocyanate is added to the dispersion and, before applying the dispersion to the base, from 15 to 55% of the NCO groups present react with the hydroxyl-containing polymer of the binder mixture.Type: GrantFiled: August 27, 1985Date of Patent: July 1, 1986Assignee: BASF AktiengesellschaftInventors: Hermann Roller, Joachim Hack, Uwe Woweries, August Lehner, Werner Grau, Peter Nagel, Roland Falk
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Patent number: 4581296Abstract: Magnetic recording media consist of a non-magnetic base and a magnetic layer firmly bonded thereto, the magnetic layer containing further additives in addition to ferromagnetic metal powder, an organic binder, a metal oxide powder and conventional assistants.Type: GrantFiled: February 26, 1985Date of Patent: April 8, 1986Assignee: BASF AktiengesellschaftInventors: Werner Balz, Jenoe Kovacs, Wulf Muenzner, Hermann Roller
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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: 4534999Abstract: Magnetic recording media which have a thin backing coating and consist of a non-magnetic flexible base and a magnetic layer which is applied to one side of the base and comprises magnetic material finely dispersed in an organic binder are produced by applying a dispersion of finely divided non-magnetizable conductive and non-conductive solids and conventional additives in a solution of a polymeric binder in an organic solvent to that side of the base which is opposite the magnetic layer by means of a knife-coater, and then drying the layer, a high molecular weight organic compound which acts as a thickener being added to the backing coating dispersion.Type: GrantFiled: July 12, 1984Date of Patent: August 13, 1985Assignee: BASF AktiengesellschaftInventors: Hermann Roller, August Lehner, Joachim Hack, Werner Grau, Werner Balz, Reinhold Baur