Magnetic recording material

Details Magnetic recording material Magnetic recording material

1983-08-26

1985-09-03

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428337, 428480, 428694, 428900, B32B 500

Patent

active

045392609

ABSTRACT:
A magnetic recording material which comprises a film of a polyester and a magnetic layer formed on at least one side of said film, said polyester containing more than 85 mol % of the repeating unit represented by the formula below and having an intrinsic viscosity of 0.3 to 1.4, and said film of said polyester having a refractive index ratio of 0.935 to 0.975 in the thickness direction and a density index of 0.02 to 0.08. ##STR1## (where X is a halogen atom selected from fluorine, chlorine, and bromine, or an alkyl group of carbon number 1 to 3; and l and m are an integer of 1 to 2, p is an integer of 2 to 6, and q is an integer of 2 to 4.)
Although the magnetic recording material is extremely thin, it exhibits outstanding running performance and electromagnetic conversion characteristics. It makes it possible to miniaturize the magnetic tape cassette and extend the recording time. It is useful for long-time video tape and portable 8-mm video tape.

REFERENCES:
patent: 3700540 (1972-10-01), Buteux
patent: 3705130 (1971-07-01), Komatsu et al.
patent: 3873504 (1975-03-01), Boettcher et al.
patent: 3901851 (1975-08-01), Kohno et al.
patent: 4112187 (1978-09-01), Asakura et al.

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