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Magnetic tape and method of manufacturing the same

  • US 9,721,605 B2
  • Filed: 12/22/2015
  • Issued: 08/01/2017
  • Est. Priority Date: 12/26/2014
  • Status: Active Grant
First Claim
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1. A magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder;

  • wherein at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide;

    a quantity of components selected from the group consisting of a fatty acid and a fatty acid amide per unit area of the magnetic tape among components that are extracted from a surface on the magnetic layer side of the magnetic tape is less than or equal to 15.0 mg/m2, the extraction being conducted by immersion of a 5 cm sample of the magnetic tape with heating in 30 mL of methanol for 3 hours at 60°

    C.; and

    a concentration of carbon, C, that is obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface on the magnetic layer side of the magnetic tape is greater than or equal to 50 atom %.

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