| 摘要 |
<p>A polyester composition comprising 0.005 to 10 % by weight of compound oxide particles having a volume average particle diameter of 0.005 to 2 mu m and composed mainly of silicon (Si), aluminium (Al) and at least one alkali metal (M), wherein the contents of the silicon, aluminium and alkali metal satisfy the following requirements: 10 wt.%</= Si </= 45 wt.%, 3 wt.%</= Al </= 30 wt.% and 0.5 wt.%</= M </= 20 wt.%, respectively. The polyester composition, particularly when formed into films, has excellent surface evenness, running ability and abrasion resistance, and such films are suitable particularly for magnetic recording media and other applications.</p> |
