PURPOSE: To obtain the titled composition, by incorporating specific amounts of glass fibers and glass beads with a polyester resin, capable of exhibiting improved heat resistance without deteriorating improved characteristics of the resin and giving molded articles having good appearance with little warpage and sink mark, etc.
CONSTITUTION: A polyester resin composition obtained by incorporating (A) 100pts.wt. linear aromatic polyester, e.g. polyethylene terephthalate, with (B) ≥10pts.wt. glass fibers having 5W10 weight-average length/diameter ratio and (C) glass beads having within 5W200μ diameter range at ≥0.5wt. ratio (C/B) between the components (C) and (B) to give 20W200pts.wt., preferably 50W 200pts.wt. total of the components (B) and (C). Preferably, the composition is prepared as follows: Given amounts of the respective components are melt kneaded previously in an extruder, and pelletizing the resultant mixture. The component (C) is preferably pretreated with a silane coupling agent, etc. to improve the adhesiveness to the polymer.
NAKAMURA YOUICHI
OGAWA YOSHINARI
| JPS5417956A | 1979-02-09 |