Magnetic recording medium comprising ferromagnetic particles hav

Details Magnetic recording medium comprising ferromagnetic particles hav Magnetic recording medium comprising ferromagnetic particles hav

1992-05-13

1993-10-19

Resan, Stevan A.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

428328, 428329, 4284259, 428694MT, 428900, G11B 500

Patent

active

052544044

ABSTRACT:
A magnetic recording medium is disclosed, comprising a non-magnetic support having thereon at least one magnetic recording layer comprising a dispersion of ferromagnetic particles in a binder, said binder comprising the combination of a polyisocyanate and a polyurethane binder comprising at least one terminal hydroxyl group at each end of the polyurethane molecule, said polyurethane binder being prepared by reacting (a) a polyurethane prepolymer comprising at least one terminal isocyanate group at each end of the polyurethane prepolymer molecule, said polyurethane prepolymer having a glass transition temperature of at least 0.degree. C. and containing a polar group, with (b) a compound comprising at least one terminal hydroxyl group at each end of the polymer molecule and having a glass transition temperature of -30.degree. C. or less.

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patent: 4457982 (1984-07-01), Rudolf et al.
patent: 4686145 (1987-08-01), Honda et al.
patent: 4784907 (1988-11-01), Matsufuji et al.
patent: 4784914 (1988-11-01), Matsufuji et al.

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