Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1986-10-17

1989-03-14

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of polyamidoester

428694, 428900, G11B 570

Patent

active

048123692

ABSTRACT:
A magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on said support, said magnetic recording layer comprising a ferromagnetic powder dispersed in a binder, which is characterized in that said binder comprises a polyurethane resin which has a repeating unit derived from diol having the formula (I); ##STR1## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different from each other, each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is any one of a hydrogen atom, a saturated or unsaturated aliphatic group having 1-5 carbon atoms, an aromatic group and a cyclic aliphatic group, and at least three substituents among R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are not hydrogen atoms; and l, m, n and p are independently integers of 1-3, 0-2, 1-3, and 1-3, respectively.

REFERENCES:
patent: 4431700 (1984-02-01), Yamada
patent: 4477531 (1984-10-01), Kohler

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