Rca Inc.

Louis A DiMarco

Leonard P Fox

Sandwich-type capacitive electronic discs having thin conductive layers are prepared by adding a thermally processed conductive molding composition comprising a thermoplastic resin, conductive carbon black particles and suitable additives to a suitable solvent to form a dispersion of the conductive carbon black in a solution of the remaining ingredients. The dispersion is filtered to remove impurities larger than a predetermined particle size and coated onto a core disc. The coating is dried to form a conductive layer which is embossed with the desired information.

Solvent-cast capacitive high density information disc

A high density capacitive information disc recording medium fabricated from a conductive plastic molding composition including a moldable plastic and conductive carbon black particles having a volatiles content at 950.degree. C. of less than about 1 percent.

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Hamilton Square, NJ, United States of America

Louis A DiMarco