| 摘要 |
PURPOSE: To obtain a resin composition capable of sufficiently dispersing an additive such as a flame retardant and giving a molded material having excel lent appearance by selecting a kneading condition to maintain a prescribed relation between a shear rate and a specific energy. CONSTITUTION: This resin composition is obtained by extruding a composition of an aliphatic polyamide comprising adipic acid and hexamethylenediamine as a principal component and <=40wt.% of additive (e.g. a flame retarder, concretely melamine cyanulate, etc.) using an extruder. In the process, the composition is obtained by selecting the kneading condition in such a manner as to keep a shear rate (γ=10-110 (unit; sec<-2> )) and a specific energy (ESP: unit; kwh/kg) to satisfy the relations expressed by formula I and formula II [T is a preset temperature of a barrel ( deg.C); Tr is torque (kg.m) ; Q is rate of discharge (kg/hr); the peripheral speed (rad/s) is a value reduced to 40kg/hr]. |
