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AssigneeToray Industries, Inc.
InventorsKen-ichi Kawakami, Toshiya Yoshii, Masaru Suzuki, Hotsuma Okasaka
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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.
A magnetic recording medium comprising:
The magnetic recording medium of claim, in which the oriented polyester film has a surface roughness (R.sub.a) of 0.001-0.010 .mu.m and a coefficient of static friction (.mu..sub.s) of 0.4-0.9.
An oriented polyester film containing, per 100 parts by weight of polyethylene .alpha., .beta.-bis(2-chlorophenoxy) ethane-4,4'-dicarboxylate,
An oriented polyester film containing, per 100 parts by weight of a polyester,
A composite polyester film comprising;
Dependencies are inferred from the claim text.