Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1988-09-20

1990-12-25

Thibodeau, Paul J.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

427131, 4284259, 428694, 428900, G11B 2300

Patent

active

049802305

ABSTRACT:
A magnetic recording medium is described, comprising a nonmagnetic support having provided thereon a first magnetic layer and a second magnetic layer in this order, each containing ferromagnetic particles, and the first and second magnetic layers each comprising at least one polyurethane resin as a binder, where the number average molecular weight of the at least one polyurethane resin contained in the first magnetic layer is 4/5 or less of that of the at least one polyurethane resin contained in the second magnetic layer.

REFERENCES:
patent: 4246316 (1981-01-01), Aonuma et al.
patent: 4259392 (1981-03-01), Suzuki et al.
patent: 4503120 (1985-03-01), Yamauchi et al.
patent: 4643941 (1987-02-01), Miyoshi et al.
patent: 4851289 (1989-07-01), Ogawa et al.
patent: 4857388 (1989-08-01), Ogawa et al.
patent: 4865924 (1909-09-01), Saito et al.

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