Patent ID: 7265187

Claim:
A process for producing a polyamide composite material comprising a polyamide A1, a polyamide A2, each being produced by polycondensing a diamine component containing 70 mol % or higher of m-xylylenediamine with a dicarboxylic acid component containing 50 mol % or higher of a C 4 to C 20 d,w-linear aliphatic dicarboxylic acid, and an organized clay B, by using a corotating intermeshing twin-screw extruder in which at least a feed section (a) with a feed port (a), a kneading section (a) having a high dispersive mixing capability, a feed section (b) with a feed port (b) and a kneading section (b) having a high distributive mixing capability are arranged in this order, the process comprising: a step of feeding the polyamide A1 containing a phosphorus compound in an amount of 500 ppm or smaller in terms of phosphorus atom and having a relative viscosity of 1.1 to 4.7 and the organized clay B into the feed section (a) through the feed port (a); a step of melt-kneading the polyamide A1 and the organized clay B substantially by dispersive mixing in the kneading section (a) to obtain a melt-knead product; a step of transporting the melt-knead product from the kneading section (a) to the feed section (b), and simultaneously feeding the polyamide A2 having a relative viscosity of 2.0 to 4.7 into the feed section (b) through the feed port (b), wherein the relative viscosity of the polyamide A1 is less than the relative viscosity of the polyamide A2; and a step of melt-kneading the melt-knead product and the polyamide A2 each from the feed section (b) substantially by distributive mixing in the kneading section (b) to prepare the polyamide composite material.