| 摘要 |
<p>PURPOSE:To provide the subject film having uniform surfaces, excellent running property and excellent abrasion resistance and useful for base films used for magnetic tapes, etc., by mixing inorganic particles having a specific volume shape coefficient, a specified average particle diameter and a specified ratio between a weight-average particle diameter and a number-average particle diameter. CONSTITUTION:The objective film contains 0.01-4wt.% of inorganic particles having a volume shape coefficient of 0.02-0.20mum, an average particle diameter of 0.05-3mum and a ratio (Dw/Dn) of <1.10 between a weight-average particle diameter (Dw) and a number-average particle diameter (Dn). The inorganic particles include cone shape lightweight calcium carbonate prepared by reacting lime milk with carbon dioxide.</p> |
