Rca Inc.

Victor S Dunn

Jordan R Nelson

William K Wissing

Bruce A Whipple

A method for obtaining a capacitive information disc record conductive molding composition having a desired melt viscosity wherein the conductive molding composition comprises carbon black and a plastic molding resin. The method comprises the steps of measuring the surface area of the carbon black particles; determining the relationship of the amount by weight of carbon black and the surface area of the carbon black particles to the melt viscosity of the conductive molding composition; and formulating the conductive molding composition by having carbon black present in an amount which is in accord with the relationship for the desired conductive molding composition melt viscosity.

Formulation of electrically conductive plastics

A method for obtaining a conductive molding composition for a capacitive information disc record having uniform and predetermined performance properties wherein the conductive molding composition comprises carbon black and a molding resin. The method comprises determining the melt viscosity of a conductive molding composition for a capacitive information disc record which has the desired performance properties, and preparing said conductive molding composition so that it has said melt viscosity.

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Indianapolis, IN, United States of America

Victor S Dunn