HIGHLY HEAT-CONDUCTIVE COMPOSITE FILLER AND HIGHLY HEAT-CONDUCTIVE RESIN COMPOSITION

摘要

PURPOSE: To obtain a highly heat-conductive composite filler improved in heat conductivity and electrical insulation properties by coating a highly heat- conductive material comprising a metal and/or carbon with an electrical heat- insulation coating film. CONSTITUTION: This filler is obtained by coating the surface of a highly heat- conductive material selected from carbon and at least one metal selected from among the metals belonging to groups 4-6 and periods of 4-6, the elements belonging to groups 13 and 14 and periods of 2 and 3 (according to the 1989 IUPAC Rules), Mg, Fe and Pb and an alloy of at least two of them and having a mean particle diameter of 0.05-200μm, an aspect ratio of 3 or above and a heat conductivity of 60-200w/(m.k) with an electrical insulation material having a volume resistivity of 1013 Ω/cm or above. 100 pts.wt. resin is mixed with 5-900 pts.wt. above filler to obtain a highly heat-conductive resin composition having a heat conductivity of 5w/m.k or above.