Magnetic recording medium comprising plural magnetic layers wher

Details Magnetic recording medium comprising plural magnetic layers wher Magnetic recording medium comprising plural magnetic layers wher

1990-09-26

1992-09-08

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694, 428900, G11B 500

Patent

active

051457458

ABSTRACT:
A magnetic recording medium having superior electromagnetic conversion characteristics and travel durability in a well balanced state. The recording medium comprises a non-magnetic support and a plurality of magnetic layers each comprising a ferromagnetic powder and a binder and each of the magnetic layers shows a peak of its loss modulus at a temperature not less than 50.degree. C. and the half-width of the loss modulus-temperature curve showing the peak of loss modulus is not larger than 20.degree. C.; and the temperature of the peak of loss modulas of the outermost magnetic layer provided at the outermost portion among the magnetic layers is higher than that of a magnetic layer other than the outermost magnetic layer.

REFERENCES:
patent: 4741977 (1988-05-01), Koga et al.
patent: 4812369 (1989-03-01), Hanai et al.
patent: 4857388 (1989-08-01), Ogawa et al.
patent: 4980230 (1990-12-01), Saito et al.
"Polymer Chemistry" by Malcolm P. Stevens, Oxford Univ. Press 1990, p. 81.

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