To obtain the subject molding excellent in electroconductivity and rigidity required as a casing material, comprising a matrix resin consisting essentially of a thermoplastic resin and electroconductive fibers of specific length existing in a specific state.
A matrix resin consisting essentially of a thermoplastic resin and an electroconductive composite material prepared by combining (A) electroconductive fibers (preferably carbon fibers having 5-15μm diameter) with (B) carbon black are molded in ≤2mm thickness. When the whole resin components are removed from a molding by a method in which a test piece (5cm×5cm) is retained at 40°C for 40 minutes in an atmosphere of a mixed gas of air and nitrogen in the volume ratio of 1:1, heated at 5°C/minute heating rate to 450°C and kept at 450°C for 20 minutes, the average length of the fibers A remaining after the removal is ≥0.5mm and the fibers A are three- dimensionally superimposed. The electroconductive composite material comprises preferably 10-40wt.% of the fibers A and 1-20% of the carbon black B.
HASHIMOTO KOICHI
KIKUCHI NAOKI
SHINO IKOU
TANAKA KEIKO
