Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1987-09-09

1988-08-02

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of polyamidoester

252 6254, 427128, 428694, 428704, 428900, G11B 5702

Patent

active

047613386

ABSTRACT:
A magnetic recording medium is disclosed which comprises a support and a magnetic recording layer provided on said support, said magnetic recording layer containing a polycarbonate polyurethane obtained by the reaction of a polycarbonatepolyol of the formula ##STR1## wherein R is selected from the group consisting of aliphatic hydrocarbons having 4 to 12 carbon atoms and aromatic hydrocarbons having 6 to 12 carbon atoms, and n is an integer of not larger than 50 with a polyisocyanate containing a plurality of isocyanate groups and, if necessary, a polyol.
In a preferred form of the invention, the layer also contains, as a dispersant, a compound of the formula ##STR2## wherein A is hydroxyl, --OM, or ##STR3## M being an alkali metal and n is an integer from 1 to 30.

REFERENCES:
patent: 4018968 (1977-04-01), Neumann
patent: 4024113 (1977-05-01), Ammons
patent: 4105641 (1978-08-01), Buysch
patent: 4131731 (1978-12-01), Lai
patent: 4160853 (1979-07-01), Ammons
patent: 4328282 (1981-01-01), Lehner
patent: 4352859 (1982-10-01), Yoda
patent: 4540627 (1985-09-01), Ishizawa
patent: 4607068 (1986-08-01), Ansel

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