MAGNETIC RECORDING MEDIUM AND METHOD FOR MANUFACTURING SAME
First Claim
1. A magnetic recording medium comprising:
- a non-magnetic support; and
a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder,wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder,the magnetic layer contains an abrasive,an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, anda squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00.
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Accused Products
Abstract
The magnetic recording medium has a non-magnetic support and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00. The present invention also provides a method for manufacturing the magnetic recording medium.
132 Citations
15 Claims
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1. A magnetic recording medium comprising:
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a non-magnetic support; and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00. - View Dependent Claims (2, 3, 4, 5)
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6. A method for manufacturing the magnetic recording medium,
wherein the magnetic recording medium is a magnetic recording medium comprising: -
a non-magnetic support; and a magnetic layer which is provided on the support and contains ferromagnetic powder and a binder, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio (Int (110)/Int (114)) of a peak intensity Int (110) of a diffraction peak of (110) plane of a crystal structure of the hexagonal ferrite, determined by performing X-ray diffraction analysis on the magnetic layer by using an In-Plane method, to a peak intensity Int (114) of a diffraction peak of (114) plane of the crystal structure is equal to or higher than 0.5 and equal to or lower than 4.0, and a squareness ratio in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00; and the method comprising; forming the magnetic layer through a step of preparing a composition for forming a magnetic layer, a step of forming a coating layer by coating the non-magnetic support with the prepared composition for forming a magnetic layer directly or through at least another layer, and a step of performing a vertical alignment treatment on the coating layer, wherein the step of preparing a composition for forming a magnetic layer includes a first stage of obtaining a dispersion liquid by performing a dispersion treatment on the ferromagnetic hexagonal ferrite powder, the binder, and a solvent in the presence of first dispersion beads and a second stage of performing a dispersion treatment on the dispersion liquid obtained by the first stage in the presence of second dispersion beads having a bead size and a density smaller than a bead size and a density of the first dispersion beads. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification