Polyester film for magnetic recording media

Details Polyester film for magnetic recording media Polyester film for magnetic recording media

1986-05-29

1987-06-02

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428143, 428323, 428480, 428694, 428900, 428910, G11B 564

Patent

active

046703195

ABSTRACT:
A biaxially oriented polyester film for use in thin metallic film-type magnetic recording media, said polyester film having a first surface to which a thin metallic film as a magnetic recording layer is to be applied and a second surface coated with an easily slippable layer composed of an organic polymeric binder and inert fine solid particles dispersed therein, the first surface having (a) large protrusions with a diameter of 0.2 to 2 micrometers and a height of 20 to 200 angstrom distributed at a density of at least 10.sup.3 but less than 10.sup.6 per mm.sup.2, and (b) small protrusions with a diameter of 0.01 to 0.1 micrometer and a height of 10 to 100 angstrom distributed at a density of from 10.sup.6 up to 10.sup.9.

REFERENCES:
patent: 4505966 (1985-03-01), Adachi et al.
patent: 4550049 (1985-10-01), Ono et al.
patent: 4578729 (1986-03-01), Suzuki et al.

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