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公开(公告)号：US10714139B2
公开(公告)日：2020-07-14
申请号：US16037564
申请日：2018-07-17
Applicant: FUJIFILM Corporation
Inventor： Takuto Kurokawa , Norihito Kasada , Toshio Tada , Eiki Ozawa
Abstract: The magnetic recording medium includes a non-magnetic support and a magnetic layer containing ferromagnetic powder and a binder, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, the magnetic layer contains an abrasive, an intensity ratio of a peak intensity 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 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, a squareness ratio of the magnetic recording medium in a vertical direction is equal to or higher than 0.65 and equal to or lower than 1.00, and a contact angle with 1-bromonaphthalene measured within a surface of the magnetic layer is in a range of 50.0° to 55.0°.
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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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公开(公告)号：US10854230B2
公开(公告)日：2020-12-01
申请号：US16038884
申请日：2018-07-18
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Toshio Tada , Eiki Ozawa , Takuto Kurokawa
Abstract: The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the back coating layer is equal to or smaller than 0.060.
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公开(公告)号：US10540996B2
公开(公告)日：2020-01-21
申请号：US15280195
申请日：2016-09-29
Applicant: FUJIFILM Corporation
Inventor： Eiki Ozawa , Norihito Kasada , Masahito Oyanagi , Toshio Tada
Abstract: A magnetic tape has a magnetic layer containing ferromagnetic powder and binder on a nonmagnetic support. 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. 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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Patent Agency Ranking
公开(公告)号：US10026435B2
公开(公告)日：2018-07-17
申请号：US15241631
申请日：2016-08-19
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Masahito Oyanagi , Toshio Tada , Takuro Sugiyama
Abstract: The magnetic tape has a magnetic layer containing ferromagnetic powder and binder on the surface on one side of a nonmagnetic support and has a backcoat layer containing nonmagnetic powder and binder on the surface on the other side of the nonmagnetic support, wherein the backcoat layer is less than or equal to 0.30 μm in thickness; and the logarithmic decrement as determined by a pendulum viscoelasticity test on the surface on the backcoat layer side of the magnetic tape is less than or equal to 0.060.
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公开(公告)号：US10026434B2
公开(公告)日：2018-07-17
申请号：US15241297
申请日：2016-08-19
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：US09601146B2
公开(公告)日：2017-03-21
申请号：US14753227
申请日：2015-06-29
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Masahito Oyanagi , Toshio Tada
Abstract: An aspect of the present invention relates to a magnetic tape comprising a magnetic layer comprising ferromagnetic powder and binder on a nonmagnetic support, wherein ΔSFD in a longitudinal direction of the magnetic tape as calculated with Equation 1 ranges from 0.35 to 1.50: ΔSFD=SFD25° C.−SFD−190° C. Equation 1 wherein, in Equation 1, SFD25° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of 25° C., and SFD−190° C. denotes a switching field distribution SFD as measured in the longitudinal direction of the magnetic tape in an environment with a temperature of −190° C.
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公开(公告)号：US09251832B2
公开(公告)日：2016-02-02
申请号：US14223139
申请日：2014-03-24
Applicant: FUJIFILM Corporation
Inventor： Hiroyuki Suzuki , Toshio Tada
CPC classification number: G11B5/70678 , H01F1/11 , Y10T428/2982
Abstract: An aspect of the present invention relates to hexagonal ferrite magnetic powder, which has an activation volume ranging from 900 nm3 to 1,600 nm3, and a ratio of a coefficient of plate thickness variation to a coefficient of particle diameter variation, coefficient of plate thickness variation/coefficient of particle diameter coefficient, ranging from 0.20 to 0.60.
Abstract translation: 本发明的一个方面涉及六方晶系铁氧体磁粉，其活性体积范围为900nm 3至1600nm 3，并且板厚变化系数与粒径变化系数之比，板厚变化系数/ 粒径系数系数为0.20〜0.60。
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公开(公告)号：US20190027180A1
公开(公告)日：2019-01-24
申请号：US16038884
申请日：2018-07-18
Applicant: FUJIFILM Corporation
Inventor： Norihito Kasada , Toshio Tada , Eiki Ozawa , Takuto Kurokawa
Abstract: The magnetic tape includes a magnetic layer including ferromagnetic powder, non-magnetic powder, and a binding agent and a back coating layer including non-magnetic powder and a binding agent, in which the ferromagnetic powder is ferromagnetic hexagonal ferrite powder, an Ra measured regarding a surface of the magnetic layer is equal to or smaller than 1.8 nm, an intensity ratio of a peak intensity of a diffraction peak of a (110) plane with respect to a peak intensity of a diffraction peak of a (114) plane of a hexagonal ferrite crystal structure obtained by an X-ray diffraction analysis of the magnetic layer by using an In-Plane method is 0.5 to 4.0, a vertical squareness ratio of the magnetic tape is 0.65 to 1.00, and a logarithmic decrement acquired by a pendulum viscoelasticity test performed regarding a surface of the hack coating layer is equal to or smaller than 0.060.
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