Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2007-01-23

2007-01-23

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

Reexamination Certificate

active

11134390

ABSTRACT:
In one aspect, the magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The quantity of metal ions comprised in the nonmagnetic powder is equal to or less than 40 ppm/g. In a second aspect, the magnetic recording medium comprises a nonmagnetic layer comprising a nonmagnetic powder and a binder and a magnetic layer comprising a ferromagnetic powder and a binder in this order on a nonmagnetic support. The abrasiveness of the magnetic layer against a ferrite bar is equal to or less than 2×10−5μm/m. In both aspects, the quantity of metal ions extracted from the magnetic layer is equal to or less than 0.5 ppm/m2·100 mL.

REFERENCES:
patent: 5962125 (1999-10-01), Masaki
patent: 2004/0197605 (2004-10-01), Seki et al.
patent: 07 296360 (1995-11-01), None

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