Electrostatic dissipative plastics adapted particularly for use at elevated temperatures

摘要

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 mum, with compression grade molding resins. Typically the compression grade molding resins are about 100 mum 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 10<10 >and 10<12 >and between about 10<6 >and 10<9>) 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.