| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polycarbonate resin pellet extremely small in the content of impurities such as chloride compounds, excelling in pellet appearance without causing yellowing because of being small in deterioration of a resin, and usable resin additive-free. <P>SOLUTION: In this method of manufacturing a polycarbonate resin pellet, (1) a specific granule-shaped polycarbonate resin is used; (2) the polycarbonate resin is dropped and moved ≥50 cm in an inert gas atmosphere where oxygen concentration is ≤3 vol.%; (3) a specific amount of water having electrical conductivity ≤30 μS/cm is injected in a kneading zone of an extruder; (4) a vent opening is brought into a depressurized state to suck the water and moisture concentration in the resin is adjusted to 10-200 ppm; (5) a strand extruded from a die is cooled in the water having electrical conductivity ≤30 μS/cm; (6) the strand is cut at 70-130°C to obtain a pellet containing 10-200 ppm of water; (7) the pellet is impregnated with water in a wet atmosphere to adjust its moisture content to ≤1,300 ppm by exceeding its original moisture content. <P>COPYRIGHT: (C)2012,JPO&INPIT |
