▎ 摘　　要

NOVELTY - Pitch-based-carbon-fiber filler is obtained using mesophase pitch as raw material, and has average fiber diameter of 2-20 mu m, mean fiber length of 10-700 mu m, true density of 2.1-2.3 g/cm3 and surface pH of 6-8. The CV value of fiber diameter distribution of filler with respect to average fiber diameter is 5-15%. The pitch-based-carbon-fiber filler has a graphene sheet closed in the filler end surface observed by transmission electron microscope. The observation surface of pitch-based-carbon-fiber filler is flat through a scanning electron microscope. USE - Pitch-based-carbon-fiber filler is used for composition for forming molded product (both claimed). Uses include but are not limited to heat radiation material, heat sink for electronic component, connector, industrial power module, semiconductor package, heat spreader, die pad, printed wiring board, casting component for cooling fan, heat exchanger and electromagnetic wave shielding material. ADVANTAGE - The molded product formed using the composition containing pitch-based-carbon-fiber filler has high heat radiation characteristics, excellent moldability, high heat-and-moisture resistance, and high thermal conductivity. The increase in viscosity of matrix material of composition is suppressed. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) composition, which contains pitch-based-carbon-fiber filler, thermoplastic resin and/or thermosetting resin. The content of pitch-based-carbon-fiber filler is 3-200 volume parts with respect to 100 volume parts of resin; and (2) molded product, which is obtained by molding the composition by injection molding process, press-molding method, calender molding method, roll diffusion bonding, extrusion method, cast molding method or blow-molding method.