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MAGNETIC TAPE

  • US 20180240491A1
  • Filed: 02/20/2018
  • Published: 08/23/2018
  • Est. Priority Date: 02/20/2017
  • Status: Active Grant
First Claim
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1. A magnetic tape comprising:

  • a non-magnetic support; and

    a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support,wherein a center line average surface roughness Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm,a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is equal to or smaller than 0.050,the magnetic layer includes fatty acid ester,a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 7.0 nm,a full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 7.0 nm, anda difference Safter

    Sbefore between a spacing Safter measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and a spacing Sbefore measured by optical interferometry regarding the surface of the magnetic layer before performing the vacuum heating with respect to the magnetic tape is greater than 0 nm and equal to or smaller than 8.0 nm.

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