Aromatic polycarbonate resin granule

Abstract

An aromatic polycarbonate resin granule formed of an aggregate of fine powder particles, the granule having a specific surface area of 0.05 to 2.0 m.sup.2 /g, a bulk density of 0.3 to 0.8 g/ml, and an average particle diameter of 0.2 to 5 mm. At least 90% of the fine powder particles forming the granule have a particle diameter of 50 .mu.m or less, and the content of a halogenated hydrocarbon as an organic solvent in the granule is 50 ppm or less in terms of a halogen amount. The polycarbonate granule is obtained by preparing a slurry or wet paste containing a polycarbonate, in which the amount of an organic solvent based on the total amount of the polycarbonate and the organic solvent is 10 to 65% by weight, and the amount of water based on the polycarbonate is at least 5% by weight. The above slurry or wet paste is subjected to a pulverization step to form the fine powder particles in which at least 90% have a particle diameter of 50 .mu.m or less. The fine powder of the polycarbonate is treated to form an aggregate in which the amount of the organic solvent based on the total amount of the polycarbonate and the organic solvent is 10 to 65% by weight and the amount of water based on the polycarbonate is 5 to 20% by weight. The polycarbonate aggregate granule particles are subject to a drying step to obtain granules composed of the fine powder in which at least 90% retain a particle diameter of 50 .mu.m or less and in which the content of the halogenated hydrocarbon as an organic solvent in the granule is 50 ppm or less in terms of halogen amount.