Scratch resistant antistatic sound and picture carrier and process for its production
AssigneeGesellschaft fur Oberflachentechnik mbH
InventorsAxel Breuninger, Richard Pollmann, Peter Scheyrer
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Abstract
Scratch resistant and antistatic sound and picture carriers made of synthetic resins are obtained by providing their surfaces with a thin metal layer. The previously known gold layers applied electrolytically or in high vacuum have the disadvantage that they either were not sufficiently resistant to abrasion or the quality of reproduction was greatly impaired. Better results are obtained by providing the surfaces of the sound or picture carrier (1) with a thin coating (2), made of an iron-chromium-nickel alloy applied in a high vacuum and in a given case coating this layer with a noble metal coating (3), especially a gold coating, likewise applied in a high vacuum.
Claims21
A scratch resistant, antistatic sound or picture carrier made of an inner synthetic resin layer and having applied to the surfaces thereof either (1) outer layers consisting of an iron-chromium-nickel alloy, containing 10 to 25 weight % chromium, 5 to 20 weight % nickel, balance iron or (2) having applied thereto intermediate layers consisting essentially of either (1) an iron-chromium-nickel alloy consisting of 10 to 25 weight % chromium, 5 to 20 weight % nickel, balance iron or (b) an iron-chromium alloy and outer layers consisting essentially of a noble metal or a noble metal alloy coating said intermediate layers, the outer layer in each of (1) or (2) having a thickness of 0.2 to 0.6.mu..
Dependencies are inferred from the claim text.