| 摘要 |
<p>An oriented polyester film is provided according to the present invention which contains, per 100 parts by weight of a polyester, (A) 0.005-2 parts by weight of fine particles having average size of 0.05-3 mu m, and (B) 0.005-2 parts by weight of at least one compound selected from the group consisting of high aliphatic monocarboxylic acids having 10-33 carbon atoms and esters thereof. Herein also disclosed is a composite polyester film which comprises a resin layer of copolyester or copolyester ether containing an ester-forming alkali metal salt of sulfonic acid compound, the layer being laminated on at least one side of the oriented polyester film as a substrate. The present invention further provides a magnetic recording medium comprising the oriented polyester film or the composite polyester film as a base. The novel films of the present invention have a surface satisfying three properties: flatness, slipperiness and adhesion, which are considered unable to be attained with a conventional polyester film. Furthermore, a magnetic recording medium having good electromagnetic conversion and running properties can be obtained from the films in the invention.</p> |
