JP2582569B

PURPOSE:To obtain the titled composition having excellent dispersibility and resistant to deterioration of physical properties, eliminating the cooling, drying and remelting processes of the resin, by kneading and dispersing white inorganic pigment in molten polymer, mixing the dispersion with virgin resin and polymerizing the mixture. CONSTITUTION:An aromatic dicarboxylic acid such as terephthalic acid and ethylene glycol, etc., are subjected to polycondensation reaction in a continuous polymerizer. The polymerized resin (A) is extracted from the polymerizer through a liquid transfer pipe 1, cooled preferably to Tm+5 deg.-Tm+25 deg.C (Tm is melting point) with a cooler 2, transferred through an inlet 5 to a kneader 3, kneaded with a white inorganic pigment (B) (e.g. talc) supplied from a feeder 4 and transferred to a static mixer 7 with a metering pump 7. Separately, an unkneaded virgin resin is supplied to the static mixer 9 with a metering pump 8 and dispersed in the component A in a manner so as to give a component B concentration of >=10wt.%. The dispersion liquid is supplied to a polymerization reactor 10 and polymerized to obtain the objective composition.