Basf Magnetics Gmbh

Hans-Peter Schildberg

Hartmut Hibst

Alfred Hagemeyer

Gerd Fischer

Johannes Heitz

Dieter Baeuerle

Harald Keller

Klaus D Schomann

Helmut Steininger

Helmut Kopke

Ulrich Jaeger

Hans J Richter

Sylvain Lazare

Matthias Bolle

Sheet-like polyethylene terephthalate materials having slight surface roughness consisting of dendritic, plateau-like structures having a fissured, fractal edge, a process for their preparation by exposing the surfaces to UV radiation produced by the decomposition of excimers, and the use of polyethylene terephthalate films treated in this manner as a substrate for ferromagnetic thin metal layers.

Sheet-like polyethylene terephthalate materials having slight surface

A thin metal layer is applied in a thickness of less than 1,000 nm to a polymeric, web-like substrate which is moved along a cylindrical support in a vacuum chamber containing an evaporator crucible releasing the metal vapor toward the support and two coating screens arranged between the evaporator crucible and the support and defining the limiting angles of incidence of the vapor jet striking the substrate, by a process in which, in the case of predetermined limiting angles of incidence, the amount of metal vapor applied to the substrate can be optimized by means of the arrangement of the coating screens and the position of the evaporator crucible.

Application of a thin metal layer to a polymeric substrate

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.

Magnetic recording medium

Sheet-like PET materials having slight surface roughness consisting of fine dot patterns in the submicron range are produced by double successive exposure of the surfaces to polarized UV light produced by a pulsed excimer laser and having planes of polarization arranged at an angle of from 20.degree. to 90.degree. relative to one another, and the PET films treated in this manner are used as a substrate for thin ferromagnetic metal layers.

Preparation of sheet-like polyethylene terephthalate materials having

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Mannheim, Germany

Hans-Peter Schildberg