Basf Aktiengesellschaft

Basf Magnetics Gmbh

Werner Grau

Werner Balz

August Lehner

Joachim Hack

Eberhard Koester

Hermann Roller

Helmut Kopke

Reinhold Baur

Werner Lenz

Manfred Ohlinger

Jenoe Kovacs

Dieter Mayer

Guenter Heil

Friedrich Sommermann

Michael Hitzfeld

Helmut Jakusch

Albert Kohl

Norbert Schneider

Peter Heilmann

Roland Falk

Eduard Schoenafinger

Milena Melzer

Peter Nagel

Roland Koenig

Milan Velic

Heinrich Mannsperger

Eckhart Kneller

Hartmut Hibst

Klaus Schoettle

Herbert Spoor

Herbert Motz

Paul Deigner

Werner Loeser

Hans Henning Schneehage

Heinrich Wittkamp

Arend Werner

Ludwig Kreitner

Norbert Holl

Friedrich Domas

Dieter Stockburger

Reinhard Polke

Peter Engelhardt

Uwe Woweries

Udo Kullmann

Werner Latzel

Paul Willmann

Hans Reichert

Edwin Rothfuss

Hermann Maier

Werner Sickmueller

Christine Guttner

Eberhard Koster

Werner Loser

Gunter Schadel

Gunter Vath

Wulf Muenzer

Juergen Richter

Gerd Maurer

Gerd Erhardt

Rainer Bender

Axel-Ruediger Schulze

Kurt Doerr

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.

Magnetic recording medium having an infra-red light transparent balkcoat

Disk-shaped magnetic recording media essentially consisting of a flexible substrate, a thin ferromagnetic metal film applied to one or both sides and a protective or antifriction layer present on this metal film and essentially consisting of carbon, a process for the production of these recording media and information stores containing these recording media.

Disk-shaped magnetic recording media, their production and information

Magnetic recording media are produced by preparing a dispersion of anisotropic magnetic materials in solution in an organic binder using dispersants and further conventional additives, applying the dispersion in the form of a layer onto a nonmagnetic substrate and solidifying the applied magnetic layer, by a process in which a cylindrical grinding chamber is used which is provided with an anchor stirrer or helical stirrer and contains grinding media whose specific gravity is lower than that of the magnetic material.

Production of magnetic recording media

A method and an arrangement for reducing wear in magnetic storage means having magnetic disks, in particular having flexible media, become effective when predetermined maximum waiting times of the heads on the same track or the same tracks have elapsed. The heads HD are moved away from the waiting tracks in accordance with the predetermined control scheme, may be moved in waiting areas of the magnetic surface, and are moved back to the waiting position.

Method and arrangement for reducing wear in a magnetic storage means

Magnetic recording media consist of a flexible disk-shaped nonmagnetic base, a cobalt/chromium layer applied thereto and suitable for vertical recording, and a friction-reducing layer of amorphous carbon present on this alloy layer.

Magnetic recording media

Magnetic recording media, consisting of a non-magnetic base and a magnetic layer firmly bonded thereto, exhibit improved properties in sustained operation if, in the course of their production, a dispersion of inorganic particles in a solvent is applied to the magnetic layer, and the solvent is then removed.

Disk-shaped nickel-plated aluminum substrates which are used as bases in the production of magnetic recording disks having a magnetizable metallic layer are surface treated by polishing and texturing.

Surface treatment of disk-shaped nickel-plated aluminum substrates

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 further conventional additives, wherein the lubricant used is zinc stearate which has been rendered hydrophilic.

A magnetic dispersion which can be applied to a non-magnetic base to produce a recording medium is prepared by dispersing a magnetically anisotropic material in a polymer binder and in an organic solvent by a method wherein the magnetically anisotropic material is worked in a jet mill before and/or during dispersing.

Preparation of a magnetic dispersion

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.

Preparation of magnetic recording media

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.

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.

Magnetic recording media comprise a non-magnetic base and one or more magnetic layers consisting of an organic binder matrix containing finely divided magnetic material, the said matrix being obtained by electron beam curing of a mixture of from 70 to 90% by weight of a polyurethane acrylate polymer possessing polymerizable double bonds and from 10 to 30% by weight of one or more copolymerizable compounds.

Magnetic recording media possess, on a dimensionally stable base which may or may not be provided with a non-magnetic lower layer, a thin ferromagnetic metal layer on which a protective layer consisting of a silicon monoxide/chromium dual coating is applied.

Magnetic recording media with a dual protective coating of silicon

Magnetic recording media comprise a non-magnetic base and one or more magnetic layers consisting of an organic binder matrix containing finely divided magnetic material, the said matrix being obtained by electron beam curing of a mixture of from 50 to 100% by weight of a polyurethane acrylate polymer possessing polymerizable double bonds and from 0 to 50% by weight of an acrylate and/or an acrylate prepolymer and/or an N-vinyl monomer and/or an N-vinyl prepolymer.

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Werner Grau