MAGNETIC TAPE AND METHOD OF MANUFACTURING THE SAME
First Claim
1. A magnetic tape,which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support,wherein a magnetic layer comprises a fatty acid ester;
- a full width at half maximum of a spacing distribution as measured by optical interferometry on a magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm;
a full width at half maximum of a spacing distribution as measured by optical interferometry on a magnetic layer side surface of the magnetic tape after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm; and
a difference between a spacing Safter as measured by optical interferometry on a magnetic layer side surface of the magnetic tape after vacuum heating the magnetic tape and a spacing Sbefore as measured by optical interferometry on a magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape, Safter−
Sbefore, is greater than 0 nm but less than or equal to 8.0 nm.
1 Assignment
0 Petitions
Accused Products
Abstract
The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the magnetic layer contains a fatty acid ester, the full width at half maximum of the spacing distribution as measured by optical interferometry on the magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm, the full width at half maximum of the spacing distribution after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm, and the difference between the spacing Safter after vacuum heating the magnetic tape and the spacing Sbefore before vacuum heating the magnetic tape, Safter−Sbefore, is greater than 0 nm but less than or equal to 8.0 nm.
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Citations
20 Claims
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1. A magnetic tape,
which comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein a magnetic layer comprises a fatty acid ester; -
a full width at half maximum of a spacing distribution as measured by optical interferometry on a magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm; a full width at half maximum of a spacing distribution as measured by optical interferometry on a magnetic layer side surface of the magnetic tape after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm; and a difference between a spacing Safter as measured by optical interferometry on a magnetic layer side surface of the magnetic tape after vacuum heating the magnetic tape and a spacing Sbefore as measured by optical interferometry on a magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape, Safter−
Sbefore, is greater than 0 nm but less than or equal to 8.0 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of manufacturing a magnetic tape,
wherein the magnetic tape comprises a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein a magnetic layer comprises a fatty acid ester; -
a full width at half maximum of a spacing distribution as measured by optical interferometry on a magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm; a full width at half maximum of a spacing distribution as measured by optical interferometry on a magnetic layer side surface of the magnetic tape after vacuum heating the magnetic tape is greater than 0 nm but less than or equal to 5.0 nm; and a difference between a spacing Safter as measured by optical interferometry on a magnetic layer side surface of the magnetic tape after vacuum heating the magnetic tape and a spacing Sbefore as measured by optical interferometry on a magnetic layer side surface of the magnetic tape before vacuum heating the magnetic tape, Safter−
Sbefore, is greater than 0 nm but less than or equal to 8.0 nm; andthe method comprises; coating and drying a magnetic layer-forming composition comprising ferromagnetic powder, binder, and a fatty acid ester on a nonmagnetic support to form a magnetic layer; and applying vibration to the magnetic layer that has been formed. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification