| 摘要 |
<p>PURPOSE:To provide a polyester film having a uniform surface and excellent running properties and transparency. CONSTITUTION:A polyester film containing 0.01-5wt.% porous precipitated silica particles which are agglomerates of primary particles of a mean particle diameter of 0.01-0.1mum and have a mean particle diameter of 0.1-5mum, a pore volume of 0.05-0.5ml/g and a specific surface area of 30-150m<2>/g.</p> |
