Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2008-09-16

2008-09-16

Rickman, Holly (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Binder media

Reexamination Certificate

active

10898232

ABSTRACT:
The present invention provides a magnetic recording medium which has a thin film magnetic layer considerably excellent in surface smoothness, and is excellent in electromagnetic conversion property. A magnetic recording medium comprising a non-magnetic support, a lower non-magnetic layer comprising at least a non-magnetic powder and a binder resin on one surface of the non-magnetic support, and a magnetic layer comprising at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, wherein when the magnetic recording medium is subjected to extraction treatment with water, 7 to 23 μg of PO43−ions are extracted per 10 mm3of the volume of the lower non-magnetic layer of the magnetic recording medium. A magnetic recording medium comprising a non-magnetic support, a lower non-magnetic layer comprising at least a non-magnetic powder and a binder resin on one surface of the non-magnetic support, and a magnetic layer comprising at least a ferromagnetic powder and a binder resin on the lower non-magnetic layer, wherein when the magnetic recording medium is subjected to extraction treatment with water, 8 to 22 μg of Mg2+ions are extracted per 10 mm3of the volume of the lower non-magnetic layer of the magnetic recording medium.

REFERENCES:
patent: 2005/0158586 (2005-07-01), Matsumoto et al.
patent: 8-194935 (1996-07-01), None
patent: 2004-5931 (2004-01-01), None
Machine translation of JP 2004-005931, Jan. 2004.

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