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1.发明申请公开(公告)号：US20190156859A1
公开(公告)日：2019-05-23
申请号：US16259319
申请日：2019-01-28
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
Abstract: The magnetic recording medium has a magnetic layer containing multiple nonmagnetic particles having a ratio, major axis length/minor axis length, of less than or equal to 1.5, the multiple nonmagnetic particles are present in the magnetic layer in a state where, when the depth to which each of the multiple nonmagnetic particles is embedded in the magnetic layer in observation of a sectional image picked up by SEM is denoted as b and the thickness of the magnetic layer as t, the average value of the ratio of b/t is less than or equal to 0.9, and the number of protrusions 5 nm or greater in height is 800 or greater and the number of protrusions 20 nm or greater in height is 20 or less as measured by AFM per an area 40 μm×40 μm on the magnetic layer side surface of the magnetic recording medium.
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2.发明申请公开(公告)号：US20130323161A1
公开(公告)日：2013-12-05
申请号：US13905391
申请日：2013-05-30
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
IPC: H01F1/01
CPC classification number: H01F1/01 , C01G49/0036 , C01G49/0072 , C01P2002/54 , C01P2004/64 , C01P2006/12 , C01P2006/42 , C04B35/2683 , C04B35/62665 , C04B2235/3215 , C04B2235/3217 , C04B2235/3218 , C04B2235/3409 , C04B2235/5409 , C04B2235/5454 , C04B2235/767 , G11B5/70678 , H01F1/11
Abstract: An aspect of the present invention relates to a method of manufacturing hexagonal ferrite magnetic powder, which comprises preparing a melt by melting a starting material mixture comprising a hexagonal ferrite-forming component and a glass-forming component and rapidly cooling the melt to obtain a solidified product, heating the solidified product to precipitate hexagonal ferrite magnetic particles and glass components in the solidified product, subjecting the solidified product to an acid treatment following the heating to remove the glass components by dissolution, incorporating the hexagonal ferrite magnetic particles obtained following the acid treatment into an acidic aqueous solution, followed by separating the particles dispersed in the aqueous solution and the precipitated particles, and subjecting the precipitated particles to a cleaning treatment and then collecting the particles.
Abstract translation: 本发明的一个方面涉及一种制造六方晶系铁氧体磁粉的方法，其包括通过熔化包含六方晶系铁素体形成组分的原料混合物和玻璃形成组分来制备熔体，并快速冷却熔体以获得固化的 产物，加热固化产物，使固化产物中的六方晶系铁氧体磁性颗粒和玻璃组分沉淀，加热后对固化产物进行酸处理，通过溶解除去玻璃成分，并加入在酸处理后获得的六方晶系铁氧体磁性颗粒 然后将分散在水溶液中的颗粒和沉淀的颗粒分离，并对沉淀的颗粒进行清洁处理，然后收集颗粒。
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公开(公告)号：US20210174829A1
公开(公告)日：2021-06-10
申请号：US17177418
申请日：2021-02-17
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
Abstract: The magnetic recording medium has a magnetic layer containing multiple nonmagnetic particles having a ratio, major axis length/minor axis length, of less than or equal to 1.5, the multiple nonmagnetic particles are present in the magnetic layer in a state where, when the depth to which each of the multiple nonmagnetic particles is embedded in the magnetic layer in observation of a sectional image picked up by SEM is denoted as b and the thickness of the magnetic layer as t, the average value of the ratio of b/t is less than or equal to 0.9, and the number of protrusions 5 nm or greater in height is 800 or greater and the number of protrusions 20 nm or greater in height is 20 or less as measured by AFM per an area 40 μm×40 μm on the magnetic layer side surface of the magnetic recording medium.
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公开(公告)号：US20160322076A1
公开(公告)日：2016-11-03
申请号：US15141168
申请日：2016-04-28
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
Abstract: The magnetic tape has a nonmagnetic layer, a magnetic layer, and a backcoat layer; with one or both of the magnetic layer and nonmagnetic layer comprising at least one type of lubricant; with the backcoat layer comprising at least one type of lubricant; with a surface lubricant index as measured on a surface of the magnetic layer ranging from 1.00 to 4.00; and with a state of a presence of indentations on the surface of the magnetic layer satisfying condition 1 and condition 2: condition 1: a number of indentations greater than or equal to 5 nm and less than 10 nm in depth of 5 to 1,000 per 350 μm×260 μm area; and condition 2: a number of indentations greater than or equal to 10 nm in depth of less than or equal to 100 per 350 μm×260 μm area.
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5.发明申请公开(公告)号：US20130164564A1
公开(公告)日：2013-06-27
申请号：US13727212
申请日：2012-12-26
Applicant: FUJIFILM Corporation
Inventor： Kazufumi OMURA , Masahiko MORI
IPC: G11B5/712
CPC classification number: G11B5/712
Abstract: An aspect of the present invention relates to a method of manufacturing magnetic particles, which comprises: adding a compound to a water-based magnetic liquid, wherein the water-based magnetic liquid comprises magnetic particles dispersed in an acidic water-based solvent, and the compound is selected from the group consisting of amine compounds, aromatic compounds, and aliphatic compounds having one or more monovalent phosphorus polar groups denoted by: wherein m1 denotes 0 or 1, m2 denotes 1 or 2, and M denotes a hydrogen atom or an alkali metal atom; and then collecting the magnetic particles from the water-based magnetic liquid to obtain the magnetic particles the surfaces of which have been modified by being coated with the compound.
Abstract translation: 本发明的一个方面涉及一种制造磁性颗粒的方法，其包括：向水性磁性液体中加入化合物，其中水性磁性液体包含分散在酸性水基溶剂中的磁性颗粒， 化合物选自胺化合物，芳族化合物和具有一个或多个一价磷极性基团的脂族化合物，其表示为：其中m1表示0或1，m2表示1或2，M表示氢原子或碱 金属原子; 然后从水性磁性液体中收集磁性粒子，得到表面用化合物进行了改性的磁性粒子。
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Patent Agency Ranking
公开(公告)号：US20190074032A1
公开(公告)日：2019-03-07
申请号：US16115962
申请日：2018-08-29
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI , Yoshihiro SAWAYASHIKI
IPC: G11B5/714
Abstract: The magnetic recording medium includes a non-magnetic support; a non-magnetic layer including a non-magnetic powder and a binding agent on the non-magnetic support; and a magnetic layer including a ferromagnetic powder, a binding agent, and a non-magnetic powder on the non-magnetic layer, in which a skewness Rsk obtained using an atomic force microscope in a measurement region of a surface of the magnetic layer having a size of 5 μm×5 μm is greater than 0, a maximum peak height Rmax is equal to or smaller than 30.0 nm, and the number of projections having a height equal to or greater than 10 nm is equal to or greater than 10, and a magnetic recording and reproducing device including: this magnetic recording medium; and a magnetic head.
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7.发明申请公开(公告)号：US20170092314A1
公开(公告)日：2017-03-30
申请号：US15278705
申请日：2016-09-28
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
Abstract: The magnetic recording medium has a magnetic layer containing multiple nonmagnetic particles having a ratio, major axis length/minor axis length, of less than or equal to 1.5, the multiple nonmagnetic particles are present in the magnetic layer in a state where, when the depth to which each of the multiple nonmagnetic particles is embedded in the magnetic layer in observation of a sectional image picked up by SEM is denoted as b and the thickness of the magnetic layer as t, the average value of the ratio of b/t is less than or equal to 0.9, and the number of protrusions 5 nm or greater in height is 800 or greater and the number of protrusions 20 nm or greater in height is 20 or less as measured by AFM per an area 40 μm×40 μm on the magnetic layer side surface of the magnetic recording medium.
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公开(公告)号：US20140356525A1
公开(公告)日：2014-12-04
申请号：US14464024
申请日：2014-08-20
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI , Hiroyuki SUZUKI
CPC classification number: G11B5/842 , G11B5/70678 , H01F1/11
Abstract: An aspect of the present invention relates to a method of manufacturing hexagonal ferrite magnetic powder. The method of manufacturing hexagonal ferrite magnetic powder comprises wet processing hexagonal ferrite magnetic particles obtained following acid treatment in a water-based solvent to prepare an aqueous magnetic liquid satisfying relation (1) relative to an isoelectric point of the hexagonal ferrite magnetic particles: pH0−pH*≧2.5, wherein, pH0 denotes the isoelectric point of the hexagonal ferrite magnetic particles and pH* denotes a pH of the aqueous magnetic liquid, which is a value of equal to or greater than 2.0, adding a surface-modifying agent comprising an alkyl group and a functional group that becomes an anionic group in the aqueous magnetic liquid to the aqueous magnetic liquid to subject the hexagonal ferrite magnetic particles to a surface-modifying treatment, and removing the water-based solvent following the surface-modifying treatment to obtain hexagonal ferrite magnetic particles.
Abstract translation: 本发明的一个方面涉及六角铁氧体磁粉的制造方法。 制造六方晶系铁氧体磁粉的方法包括：在水性溶剂中进行酸处理后得到的湿法加工六方晶系铁氧体磁性颗粒，以制备相对于六方晶系铁氧体磁性颗粒的等电点满足关系式（1）的水性磁性液体：pH0- pH *≥2.5，其中，pH0表示六方晶系铁氧体磁性颗粒的等电点，并且pH *表示水性磁性液体的pH值等于或大于2.0，加入表面改性剂包括 烷基和在含水磁性液体中成为阴离子基团的官能团，以使六方晶系铁氧体磁性颗粒进行表面改性处理，并且在表面改性处理之后除去水性溶剂以获得 六角铁氧体磁性颗粒。
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9.发明申请公开(公告)号：US20250111864A1
公开(公告)日：2025-04-03
申请号：US18899572
申请日：2024-09-27
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
Abstract: The magnetic recording medium includes: a non-magnetic support; a magnetic layer containing a ferromagnetic powder; and a non-magnetic layer containing a non-magnetic powder between the non-magnetic support and the magnetic layer, in which a total chlorine content of the magnetic layer and the non-magnetic layer is 30.0 mg/m2 or less as a value per unit area, and a total iron content of the magnetic layer and the non-magnetic layer is 300.0 mg/m2 or less as a value per unit area.
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10.发明申请公开(公告)号：US20210350826A1
公开(公告)日：2021-11-11
申请号：US17241078
申请日：2021-04-27
Applicant: FUJIFILM Corporation
Inventor： Masahiko MORI
Abstract: The magnetic recording medium includes a non-magnetic support; a non-magnetic layer which contains a non-magnetic powder and is provided on the non-magnetic support; and a magnetic layer which contains a ferromagnetic powder and is provided on the non-magnetic layer, in which a thickness of the non-magnetic layer is less than 0.7 μm, and an average 5-point peak height Rpm is 30 nm or lower and the number of projections having a height of 5 nm or higher is 5,000 or more, as obtained by using an atomic force microscope in a measurement region of 90 μm square on a surface of the magnetic layer.
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