Processing of video discs
AssigneeRCA Corporation
InventorsEugene S. Poliniak, Pabitra Datta
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Abstract
High density information discs, such as video discs, which have been treated with a fluorinating agent become resistant to and stable under conditions of high temperature and high relative humidity, even after exposure to such conditions for extended periods of time. The treatment with the fluorinating agent is accomplished by use of a bath of an aqueous solution of a "soft" fluorinating reagent, such as fluorosilicic acid or fluoroboric acid.
Claims14
In the manufacture of a conductive, high density information disc having video and audio information in the form of geometric variations in an information track which can be reconstituted in electrical signal form with a playback stylus, wherein a conductive plastic is compression molded to form said high density information disc, the improvement which comprises treating the surfaces of said high density information disc with a fluorinating reagent selected from the group consisting of fluorosilicic acid, fluoroboric acid, hydrofluoric acid, and antimony pentafluoride to render said high density information disc substantially resistant to and stable under conditions of high temperature and high relative humidity.
In a method of fabricating a high density information disc replica which comprises dry blending a polyvinylchloride resin with additives including stabilizers, lubricants and flow modifiers, compression molding the resultant blend to form a high density information disc replica, and applying a thin lubricant layer to the surfaces of the disc replica, the improvement which comprises treating the surfaces of said high density information disc replica with a fluorinating reagent selected from the group consisting of fluorosilicic acid, fluoroboric acid, hydrofluoric acid, and antimony pentafluoride to render the same substantially resistant to and stable under conditions of high temperature and high relative humidity, prior to the applying of the lubricant.
Dependencies are inferred from the claim text.