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Magnetic recording medium
| Details |
Inventors: Ishikawa, Akira; Nakayama, Hidehiko; Yamashita, Kazutaka;
Assignee: Kao Corporation (Tokyo, JP)
Primary Examiner: Kiliman; Leszek
Assistant Examiner:
Attorney, Agent or Firm: Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
Magnetic recording media comprising a nonmagnetic substrate, a surface layer and a back layer, the surface layer having an intermediate layer provided on the surface side of the nonmagnetic substrate and a magnetic layer as a top layer, the back layer having a backcoating layer provided on the back side of the nonmagnetic substrate, the magnetic layer containing a ferromagnetic metal powder and a binder, wherein the surface layer has a residual solvent content of 5 to 1000 ppm, the ferromagnetic metal powder is a ferromagnetic metal powder mainly comprising iron and containing 0.8 to 20 parts by weight of at least one element selected from Group IIIa elements, inclusive of lanthanides, of the Periodic Table per 100 parts by weight of Fe atoms, the magnetic layer has a thickness of 0.05 to 0.6 .mu.m, the magnetic layer has a center-line surface roughness Ra of 1 to 5 nm, the back layer has a residual solvent content of 5 to 800 ppm, and the backcoating layer has a center-line surface roughness Ra of 2 to 8 nm, exhibit excellent electromagnetic characteristics and storage stability. |
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DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic recording medium of the present invention will be described below in detail.
The explanation is made in the context of a preferred structure of the magnetic recording medium of the present invention by referring to FIG.
1.
As shown in FIG.
1, a magnetic recording medium 1 according to the present invention is comprised of a nonmagnetic substrate 2, a surface layer 10 having an intermediate layer 3 which is provided on the surface side of the nonmagnetic substrate 2 and a magnetic layer 4 which is provided on the intermediate layer 3 as a top layer, and a back layer 20 having a backcoating layer 5 which is provided on the back side of the nonmagnetic substrate 2.
The magnetic layer 4 contains a ferromagnetic metal powder and a binder.
The magnetic recording medium of the present invention may further have other layers in the surface layer 10 or back layer 20 in addition to the above-mentioned nonmagnetic substrate 2, intermediate layer 3, magnetic layer 4, and backcoating layer 5.
For example, a primer layer may be provided between the nonmagnetic substrate 2 and the intermediate layer 3, or a primer layer may be provided between the nonmagnetic substrate 2 and the backcoating layer 5; and a magnetic or nonmagnetic layer for recording servo signals to cope with hard systems using long wavelength signals may be provided in the surface layer 10 (i.
e.
, between the nonmagnetic substrate 2 and the intermediate layer 3 or between the intermediate layer 3 and the magnetic layer 4).
The magnetic recording medium of the present invention is characterized in that: the surface layer has a residual solvent content of 5 to 1000 ppm; the ferromagnetic metal powder is a ferromagnetic metal powder mainly comprising iron and containing 0.
8 to 20 parts by weight of at least one element selected from Group IIIa elements, inclusive of lanthanides, of the Periodic Table per 100 parts by weight of an Fe atom; the magnetic layer has a thickness of 0
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