Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1983-08-08

1985-09-10

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428195, 428201, 428206, 428327, 428693, 428694, 428695, 428900, B32B 300

Patent

active

045406189

ABSTRACT:
A magnetic recording media, e.g. VTR tape is improved by providing an undercoating layer on a polyester film substrate, the undercoating layer being formed under a ferromagnetic thin film and being an even-scattering of a large number of inorganic or organic granules distributed at a rate of 1000/mm.sup.2 or more.

REFERENCES:
patent: 3959553 (1976-05-01), Hartmann et al.
patent: 4087582 (1978-05-01), Shirahata et al.
patent: 4135031 (1979-01-01), Akashi et al.
patent: 4233352 (1980-11-01), Ono et al.
patent: 4275113 (1981-06-01), Saito et al.
patent: 4320207 (1982-03-01), Watanabe et al.
patent: 4348446 (1982-09-01), Mitsuishi et al.
patent: 4390601 (1983-06-01), Ono et al.
patent: 4439479 (1984-03-01), Kamai et al.

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