PURPOSE: To obtain the title composition having excellent lightweightness, mechanical properties, moldability, and retentivity of electromagnetic wave shielding ability, by mixing a specified polycarbonate alloy resin with stainless steel fibers, a brominated flame retardant, and Sb2O3.
CONSTITUTION: 50W90pts.wt., preferably 60W80pts.wt., aromatic polycarbonate resin [e.g., poly-2,2-bis-(4-hydroxyphenyl)propane carbonate] is mixed with 10W50 pts.wt., preferably 20W40pts.wt., ABS resin to give a polycarbonate alloy resin (a). 100pts.wt. component (a) is then mixed with 4W50pts.wt, preferably 6W40pts. wt., stainless steel fibers (b) having a diameter of 3W10μm and a length of 1W10mm, 10W50pts.wt., preferably 15W40pts.wt., brominated flame retardant (c) (e.g., octabromodiphenyl oxide) having a melting or softening point of 220°C or lower, and 0.5W15pts.wt., preferably 1W10pts.wt., Sb2O3 (d) having a mean particle diameter of 1.0μm or smaller.
NISHIKAWA TETSUO
HONMA TOSHIO
