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MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME

  • US 20170221516A1
  • Filed: 02/02/2017
  • Published: 08/03/2017
  • Est. Priority Date: 02/03/2016
  • Status: Active Grant
First Claim
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1. A magnetic tape,which comprises, on one surface of a nonmagnetic support, a magnetic layer comprising ferromagnetic powder and binder, and on the other surface of the nonmagnetic support, a backcoat layer comprising nonmagnetic powder and binder, wherein:

  • a centerline average surface roughness Ra on a surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm;

    a coefficient of friction measured on a base portion of the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.35;

    a centerline average surface roughness Ra measured on a surface on the backcoat layer side of the magnetic tape is less than or equal to 5.0 nm;

    the backcoat layer comprises a fatty acid ester,a full width at half maximum of a spacing distribution measured by optical interferometry on the surface on the backcoat layer side of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 10.0 nm;

    a full width at half maximum of a spacing distribution measured by optical interferometry on the surface on the backcoat layer side of the magnetic tape after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 10.0 nm; and

    a difference, Safter

    Sbefore, between a spacing Safter measured by optical interferometry on the surface on the backcoat layer side of the magnetic tape after vacuum heating the magnetic tape and a spacing Sbefore, measured by optical interferometry on the surface on the backcoat layer side of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 8.0 nm.

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