Rca Inc.

Robert F Poll

Mohamed Emam Labib

Nitin V Desai

Chih-Chun Wang

Chin-Chun Wang

A conductive molding composition for the preparation of high density capacitance electronic discs is disclosed. The improved composition contains only five ingredients and is characterized by superior playback without the necessity of washing the disc after pressing. The subject compositions contain as a dispersant isopropyl tri(dioctylpyrophosphato)titanate. Preferred compositions are additionally comprised of poly(vinyl chloride), conductive carbon black, diundecyl phalthalate as a plasticizer and a tin mercaptoester or tin alkyl mercaptide stabilizer.

Capacitance electronic disc molding composition

An improved conductive molding composition for the preparation of high density capacitance electronic discs is disclosed. The disclosed compositions are improved by the utilization of a solid plasticizer, cumylphenyl isophthalate, represented by the formula ##STR1## The use of this plasticizer permits the formulation of a conductive molding composition wherein all ingredients are solids.

Capacitance electronic disc molding compositions

A method for separating out carbon particles from a composition comprising a plastic and carbon particles of submicron dimensions comprising the steps of adding the composition to an organic solvent for the plastic which does not dissolve the carbon particles at a concentration sufficiently dilute to allow the carbon particles to be free from the plastic and filtering the resulting mixture in a calcium carbonate column which traps essentially all of the carbon particles.

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Somerset, NJ, United States of America

Robert F Poll