| 摘要 |
PURPOSE:To enhance fluidity at the time of injection molding and to prevent the lowering of mechanical strength by heating and melting a molding resin under specific conditions at the time of the injection molding of polycarbonate with a specific mol.wt. containing a carbon filler. CONSTITUTION:Polycarbonate(PC) with a mol.wt. of 16,000-35,000 containing 5-40vol.% of a carbon filler is heated and melted in an atmosphere containing 90vol.% or more of inert gas and the temp. of polycarbonate is set to 320-380 deg.C to perform injection molding. When the carbon filler is added to PC medium or low in fluidity, the fluidity of PC becomes bad. When the temp. of the molten resin is raised, the effect of thermal oxidative deterioration of this PC is increased as compared with glass filler-containing PC and the mechanical strength thereof is lowered. However, when this PC is heated and melted under the above mentioned conditions to be subjected to injection molding, the fluidity thereof is enhanced and a molded product having a thin-walled part can be molded without lowering mechanical strength, especially, the flexural modulus and bending strength. |
