MAGNETIC TAPE
First Claim
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1. A magnetic tape comprising, on one surface of a nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder, and thereon, a magnetic layer containing a ferromagnetic powder and a binder, whereinthe magnetic layer contains a nonmagnetic filler the average particle diameter φ
- of which satisfies relation (I) below with a thickness t of the magnetic layer;
1.0≦
φ
/t≦
2.0
(I);
the thickness t of the magnetic layer ranges from 30 to 200 nm;
the nonmagnetic layer has a thickness ranging from 30 to 200 nm;
a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; and
a centerline average surface roughness Ra of the surface of the magnetic layer, as measured by an optical three-dimensional profilometer, ranges from 0.2 to 1.5 nm.
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Abstract
An aspect of the present invention relates to a magnetic tape comprising, on one surface of a nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder, and thereon, a magnetic layer containing a ferromagnetic powder and a binder, wherein
- the magnetic layer contains a nonmagnetic filler the average particle diameter φ of which satisfies relation (I) below with a thickness t of the magnetic layer:
1.0≦φ/t≦2.0 (I);
- the thickness t of the magnetic layer ranges from 30 to 200 nm;
- the nonmagnetic layer has a thickness ranging from 30 to 200 nm;
- a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; and
- a centerline average surface roughness Ra of the surface of the magnetic layer, as measured by an optical three-dimensional profilometer, ranges from 0.2 to 1.5 nm.
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Citations
12 Claims
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1. A magnetic tape comprising, on one surface of a nonmagnetic support, a nonmagnetic layer containing a nonmagnetic powder and a binder, and thereon, a magnetic layer containing a ferromagnetic powder and a binder, wherein
the magnetic layer contains a nonmagnetic filler the average particle diameter φ - of which satisfies relation (I) below with a thickness t of the magnetic layer;
1.0≦
φ
/t≦
2.0
(I);the thickness t of the magnetic layer ranges from 30 to 200 nm; the nonmagnetic layer has a thickness ranging from 30 to 200 nm; a composite elastic modulus as measured on a surface of the magnetic layer ranges from 6.0 to 8.0 GPa; and a centerline average surface roughness Ra of the surface of the magnetic layer, as measured by an optical three-dimensional profilometer, ranges from 0.2 to 1.5 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- of which satisfies relation (I) below with a thickness t of the magnetic layer;
Specification