Electrostatic dissipative plastics adapted particularly for use at elevated temperatures

Abstract

Resins suitable for use in compression molding processes are prepared by mixing between about 10 and 30 weight % of chopped partially carbonized fibers, i.e. fibers having a carbon content of between about 70 to 95% by weight and an average size of about 100 μm, with compression grade molding resins. Typically the compression grade molding resins are about 100 μm When chopped carbon fibers of reduced conductivity are used the curve obtained by plotting the resistivity against the concentration of carbon fibers is less steep in the critical regions of interest (i.e., between about 1010 and 1012 and between about 106 and 109) than is the curve obtained when high conductivity fibers are used. It has been observed that even if some dielectric breakdown occurs, the connected fibers are not as conductive and the effect has been found not to be as significant as is the case with the usual carbon fibers which have maximized conductivity.

Dependencies are inferred from the claim text.