Molded article for shielding electromagnetic radiation in personal computers, cellular phones and automobiles comprises thermoplastic resin and carbon fibers

摘要

A molded article comprises 70-99.5 wt.% thermoplastic resin and 0.5-30 wt.% carbon fibers comprising (a) 0.1-4.7 wt.% fibers of more than 1.5 mm long, (b) 0.2-10.7 wt.% fibers of 0.5 to 1.5 mm long, and (c) 0.2-14.6 wt.% fibers of 0.5 mm long. Independent claims are also included for: (a) a method of reducing electromagnetic radiation by placing the molded article having a volume resistivity of 10<-4> - 10<3> OMICRON -cm; and (b) a method for preparing the above molded article comprising extrusion coating a roving of the carbon fiber with the thermoplastic resin using an extruder, cutting the roving coated with the resin into pellets, mixing the pellets with pellets of the thermoplastic resin, and molding the mixture into a molded article