Process for producing scratch resistant antistatic sound and picture carrier
AssigneeGFO Gesellschaft Fer Oberflachentechnik mbH
InventorsAxel Breuninger, Richard Pollmann, Peter Scheyrer
Life of this patent
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Abstract
Scratch resistant and antistatic sound and picture carriers made of synthetic resins are obtained by providing their surfaces with 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.
Claims23
A process for preparing a scratch resistant, antistatic sound or picture carrier comprising applying in a high vacuum to the surfaces of a synthetic resin layer (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) applying thereto intermediate layers consisting essentially of either (a) 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 then without breaking the vacuum applying to the surfaces of the intermediate layer outer layers consisting essentially of a noble metal or a noble metal alloy, the outer layers in each of (1) or (2) having a thickness of 0.2 to 0.6.mu..
Dependencies are inferred from the claim text.