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US 4,439,486 AGranted
Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorsYasuyuki Yamada, Masaaki Fujiyama, Nobuo Tsuji
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Abstract
A magnetic recording medium having a magnetic layer formed on a nonmagnetic base is disclosed. The magnetic layer comprises ferromagnetic particles having a specific surface area of 30 m.sup.2 /g or more. The particles are dispersed in a binder which comprises a thermoplastic polyurethane resin or polyurethane prepolymer and nitrocellulose having an average degree of polymerization of about 50 to 300 and a degree of nitration of 10.7 to 13.0.
Claims14
A magnetic recording medium, comprising:
- a nonmagnetic support base;
- and
- a magnetic layer formed on a surface of the base, the magnetic layer consisting essentially of:
- ferromagnetic particles having a specific surface area of 30 m.sup.2 /g or more;
- and
- a binder consisting essentially of a nitrocellulose having an average degree of polymerization of about 50 to 300 and a degree of nitration of 10.7 to 13.0, a polymer selected from the group consisting of a thermoplastic polyurethane resin and a polyurethane prepolymer, and a polyisocyanate compound.
3 more elements
Dependencies are inferred from the claim text.