Magnetic tape having characterized magnetic layer

Patent metadata

Field	Value
Publication number	US-10438625-B2
Application number	US-201815900160-A
Country	US
Kind code	B2
Filing date	Feb 20, 2018
Priority date	Feb 20, 2017
Publication date	Oct 8, 2019
Grant date	Oct 8, 2019

Abstract

A magnetic tape has an Ra measured regarding the surface of the magnetic layer of less than or equal to 1.8 nm, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer of less than or equal to 0.050. The magnetic layer includes fatty acid ester. The full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before and after performing vacuum heating with respect to the magnetic tape is respectively greater than 0 nm and less than or equal to 7.0 nm, and the difference between the spacing measured by optical interferometry regarding the surface of the magnetic layer after performing the vacuum heating with respect to the magnetic tape and the spacing measured before performing the vacuum heating is greater than 0 nm and less than or equal to 8.0 nm.

First claim

What is claimed is:

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 the center line average surface roughness Ra measured regarding the surface of the magnetic layer is equal to or smaller than 1.8 nm,
the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is 0.014 to 0.050,
the magnetic layer includes fatty acid ester,
the 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,
the 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,
the difference S after −S before between a spacing S after 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 S before 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, and
the logarithmic decrement on the magnetic layer side is determined by the following method:
securing a measurement sample of the magnetic tape with the measurement surface, which is the surface on the magnetic layer side, facing upward on a substrate in a pendulum viscoelasticity tester;
disposing a columnar cylinder edge which is 4 mm in diameter and equipped with a pendulum 13 g in weight on the measurement surface of the measurement sample such that the long axis direction of the columnar cylinder edge runs parallel to the longitudinal direction of the measurement sample;
raising the surface temperature of the substrate on which the measurement sample has been positioned at a rate of less than or equal to 5° C./min up to 80° C.;
inducing initial oscillation of the pendulum;
monitoring the displacement of the pendulum while it is oscillating to obtain a displacement-time curve for a measurement interval of greater than or equal to 10 minutes; and
obtaining the logarithmic decrement A from the following equation:

Δ
=

ln
⁡

(

A
1

A
2

)

+

ln
⁡

(

A
2

A
3

)

+

…
⁢

⁢

ln
⁡

(

A
n

A

n
+
1

)

n

wherein the interval from one minimum displacement to the next minimum displacement is adopted as one wave period; the number of waves contained in the displacement-time curve during one measurement interval is denoted by n, the difference between the minimum displacement and the maximum displacement of the n th wave is denoted by An, and the logarithmic decrement is calculated using the difference between the next minimum displacement and maximum displacement of the n th wave (A n+1 in the above equation).

2. The magnetic tape according to claim 1 ,
wherein the center line average surface roughness Ra is 1.2 nm to 1.8 nm.

3. The magnetic tape according to claim 1 ,
wherein the full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing the vacuum heating with respect to the magnetic tape is 3.0 nm to 7.0 nm.

4. The magnetic tape according to claim 1 ,
wherein the 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 3.0 nm to 7.0 nm.

5. The magnetic tape according to claim 1 ,
wherein the difference S after −S before is 2.0 nm to 8.0 nm.

6. The magnetic tape according to claim 1 ,
wherein the logarithmic decrement is 0.014 to 0.050,
the center line average surface roughness Ra is 1.2 nm to 1.8 nm,
the full width at half maximum of spacing distribution measured by optical interferometry regarding the surface of the magnetic layer before performing the vacuum heating with respect to the magnetic tape is 3.0 nm to 7.0 nm,
the 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 3.0 nm to 7.0 nm, and
the difference S after −S before is 2.0 nm to 8.0 nm.

7. The magnetic tape according to claim 1 , further comprising:
a non-magnetic layer including non-magnetic powder and a binding agent between the non-magnetic support and the magnetic layer.

8. The magnetic tape according to claim 1 , further comprising:
a back coating layer including non-magnetic powder and a binding agent on a surface side of the non-magnetic support opposite to a surface side provided with the magnetic layer.

Assignees

• Fujifilm Corp

Inventors

• Ozawa Eiki
• Kasada Norihito

Classifications

• G11B5/712 Primary

  characterised by the surface treatment or coating of magnetic particles · CPC title

• G11B5/78

  Tape carriers · CPC title

• G11B5/70 Primary

  on a base layer · CPC title

• G11B5/71

  characterised by the lubricant · CPC title

• G11B5/00813

  magnetic tapes · CPC title