PURPOSE: To produce a material having a good electromagnetic shielding effect, by mixing a thermoplastic resin having a specified particle size with an electrically conductive fibrous filler in a rotating container type mixer and extruding the mixture.
CONSTITUTION: Thermoplastic resin particles having a particle size of 2mm or below, such as polyolefin or polystyrene particles, and 5W80wt% (based on the total quantity of the compsn.) electrically conductive fibrous filler having a fiber length of 0.5W10mm and a fiber diameter of 10W200μ, such as metallic fiber, carbon fiber or metal-coated glass fiber, are mixed together in a rotating container type mixer such as a tumbler. The resulting mixture is extruded through an extruder (pref. one having a full-flighted screw) to form pellets, thus obtaining the titled electromagnetic shielding material.
MIYASHITA SUSUMU
OOTA NAOKI
SUGIURA MAKOTO
