Patent ID: 6342680
Filing Date: 2002-01-29
Classification: B29C,H01B,H05K,Y10S,Y10T

Abstract:
A conductive plastic in the form of pellets suitable for use as a feed for an injection molding machine for fabricating conductive elements by injection molding, the conductive plastic being formed of a conductive resin composition comprising:(a) a thermoplastic resin having a plasticization temperature; (b) a particulate lead-free solder having a melting point lower than the plasticization temperature, the lead-free solder forming a semi-melted state during plasticization of said thermoplastic resin; and (c) metal powder or a mixture of metal powder and metal short fibers, different from said solder, having a melting point higher than the plasticization temperature and assisting the fine dispersion of particles of the lead-free solder within the thermoplastic resin, wherein said conductive plastic is formed by kneading an admixture of said components (a), (b) and (c), at a temperature at which said thermoplastic resin is plasticized and said solder is semi-melted, to form soldered joints between adjacent particles of said solder, and pelletizing the kneaded admixture in a pelletizer to form said pellets.