| 摘要 |
Polyesters are combined with UV-stabilizing substances in order to produce an end product, such as a film, sheet, ribbon or filament, by mixing polyester granules and the UV-stabilizing substance in powdered form at an elevated temperature such that at least the exterior surface of the polyester granules is soft, thereby to cause the powdered UV-stabilizing substance to adhere to the individual polymer granules, the granules with the powder adhering thereto are then dried, and they are then passed through an extruder or otherwise formed into an end product. |
