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公开(公告)号：US10573341B2
公开(公告)日：2020-02-25
申请号：US15388911
申请日：2016-12-22
Applicant: FUJIFILM Corporation
Inventor： Toshio Tada , Norihito Kasada , Masahito Oyanagi
Abstract: The magnetic tape has a nonmagnetic layer containing nonmagnetic powder and binder on a nonmagnetic support and a magnetic layer containing ferromagnetic powder and binder on the nonmagnetic layer, wherein a fatty acid ester is contained in at least the magnetic layer, the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1, and ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1: ΔSFD=SFD25° C.−SFD−190° C., ranges from 0.50 to 1.60.
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公开(公告)号：US20160189739A1
公开(公告)日：2016-06-30
申请号：US14757555
申请日：2015-12-24
Applicant: FUJIFILM CORPORATION
Inventor： Norihito Kasada , Masahito Oyanagi , Toshio Tada , Kazuyuki Kitada
CPC classification number: G11B5/71 , G11B5/7305 , G11B5/78 , G11B5/8404 , G11B5/842
Abstract: Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm; at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; and a C—H derived carbon, C, concentration calculated from a C—H peak area ratio in a C1s spectrum obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on a surface on the magnetic layer side of the magnetic tape is greater than or equal to 45 atom %.
Abstract translation: 提供了一种磁带，其在非磁性载体上包括非磁性粉末和粘合剂的非磁性层，并且在非磁性层上包括含铁磁粉末和粘合剂的磁性层; 其中所述磁带的总厚度小于或等于4.80μm; 至少磁性层包含一种或多种选自脂肪酸和脂肪酸酰胺的组分; 和C-H衍生碳C，由C-H峰面积比计算出的C-H峰面积比在通过X射线光电子能谱获得的C1s光谱中以10度的光电子取出角在磁性层侧的表面上进行 的磁带大于或等于45原子％。
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3.发明授权公开(公告)号：US10515660B2
公开(公告)日：2019-12-24
申请号：US15619012
申请日：2017-06-09
Applicant: FUJIFILM Corporation
Inventor： Masahito Oyanagi , Norihito Kasada
Abstract: A magnetic tape is provided in which the center line average surface roughness Ra measured regarding the surface of the magnetic layer is less than or equal to 1.8 nm, and the logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding the surface of the magnetic layer is less than or equal to 0.050. A back coating layer includes one or more components selected from a fatty acid and a fatty acid amide. In addition, the C—H derived C concentration calculated from the C—H peak area ratio of C1s spectra obtained by X-ray photoelectron spectroscopic analysis performed regarding the surface of the back coating layer at a photoelectron take-off angle of 10 degrees is greater than or equal to 35 atom %.
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公开(公告)号：US09721607B2
公开(公告)日：2017-08-01
申请号：US15197046
申请日：2016-06-29
Applicant: FUJIFILM Corporation
Inventor： Toshio Tada , Akinori Sugishima , Tatsuya Yamashita , Norihito Kasada , Masahito Oyanagi
CPC classification number: G11B5/842 , G11B5/70678 , G11B5/714
Abstract: The magnetic recording medium has a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, and the ferromagnetic hexagonal ferrite powder has a crystallite volume as determined by X-ray diffraction analysis ranges from 1,000 nm3 to 2,400 nm3, and a ratio of the crystallite size Dx(107) obtained from a diffraction peak of a (107) plane to a particle size in a direction of an easy axis of magnetization DTEM as determined by observation with a transmission electron microscope, Dx(107)/DTEM, is greater than or equal to 1.1.
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公开(公告)号：US09721605B2
公开(公告)日：2017-08-01
申请号：US14978834
申请日：2015-12-22
Applicant: FUJIFILM Corporation
Inventor： Masahito Oyanagi , Norihito Kasada , Toshio Tada , Kazuyuki Kitada
CPC classification number: G11B5/71 , G11B5/70 , G11B5/7305 , G11B5/78 , G11B5/8404 , G11B5/842
Abstract: Provided is a magnetic tape, which comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder and binder; wherein at least the magnetic layer comprises one or more components selected from the group consisting of a fatty acid and a fatty acid amide; a quantity of components selected from the group consisting of a fatty acid and a fatty acid amide per unit area of the magnetic tape among components that are extracted from a surface on the magnetic layer side of the magnetic tape is less than or equal to 15.0 mg/m2, and a concentration of carbon, C, that is obtained by X-ray photoelectron spectroscopy conducted at a photoelectron take-off angle of 10 degrees on the surface on the magnetic layer side of the magnetic tape is greater than or equal to 50 atom %.
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Patent Agency Ranking
公开(公告)号：US10937456B2
公开(公告)日：2021-03-02
申请号：US15442961
申请日：2017-02-27
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Takuto Kurokawa , Masahito Oyanagi
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on one surface of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the other surface thereof, wherein the thickness of the backcoat layer is less than or equal to 0.20 μm, the contact angle for 1-bromonaphthalene that is measured on the surface of the backcoat layer falls within a range of 10.0° to 30.0°, and the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 55.0°.
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公开(公告)号：US10910009B2
公开(公告)日：2021-02-02
申请号：US16012018
申请日：2018-06-19
Applicant: FUJIFILM Corporation
Inventor： Masahito Oyanagi , Norihito Kasada , Toshio Tada , Takuro Sugiyama
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra as measured on the surface on the magnetic layer side of the magnetic tape is less than or equal to 1.8 nm, and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the magnetic layer side of the magnetic tape is less than or equal to 0.050.
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公开(公告)号：US10861491B2
公开(公告)日：2020-12-08
申请号：US15443026
申请日：2017-02-27
Applicant: FUJIFILM Corporation
Inventor： Masahito Oyanagi , Norihito Kasada , Takuto Kurokawa
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder, abrasive, and binder on a nonmagnetic support, wherein the centerline average surface roughness Ra measured on the surface of the magnetic layer is less than or equal to 1.8 nm, the contact angle for 1-bromonaphthalene that is measured on the surface of the magnetic layer falls within a range of 45.0° to 60.0°, and the coefficient of friction that is measured on the base portion of the surface of the magnetic layer is less than or equal to 0.35.
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9.发明授权公开(公告)号：US10692522B2
公开(公告)日：2020-06-23
申请号：US15705531
申请日：2017-09-15
Applicant: FUJIFILM Corporation
Inventor： Toshio Tada , Norihito Kasada , Masahito Oyanagi , Akinori Sugishima , Kengo Saito
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.
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公开(公告)号：US10026430B2
公开(公告)日：2018-07-17
申请号：US14867752
申请日：2015-09-28
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Masahito Oyanagi , Toshio Tada , Yasuhiro Kawatani
Abstract: The magnetic tape comprises, on a nonmagnetic support, a nonmagnetic layer comprising nonmagnetic powder and binder, and on the nonmagnetic layer, a magnetic layer comprising ferromagnetic powder, nonmagnetic powder, and binder, wherein a total thickness of the magnetic tape is less than or equal to 4.80 μm, and a coefficient of friction as measured on a base portion of a surface of the magnetic layer is less than or equal to 0.35.
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