PROCESS FOR PRODUCTION OF RESIN COMPOSITION CONTAINING FINE CARBON FIBER

摘要

A process for producing a resin composition containing a fine carbon fiber, comprising charging a fine carbon fiber and a thermoplastic resin into a kneading extruder and then kneading the mixture therein, thereby yielding a fine carbon fiber-containing resin composition in which the fine carbon fiber is compounded in the thermoplastic resin in a dispersed form. In this process, the kneading is conducted under the following conditions: the cylinder temperature of the kneading extruder is adjusted to such a temperature that the melt flow index of the thermoplastic resin under a loading of 2.16 kg as defined in JIS K 7210 falls within the range from 10 to 30; the residence time of the fine carbon fiber-containing resin composition in the kneading extruder is 25 to 100 seconds; and the shear rate of the screw segment of the kneading extruder for the fine carbon fiber-containing resin composition is 10000 to 30000/sec. This process permits a fine carbon fiber to be dispersed in a thermoplastic resin homogeneously at a stable compounding ratio, and can provide a fine carbon fiber-containing resin composition having excellent physical properties including electrical conductivity.