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公开(公告)号：US11302355B2
公开(公告)日：2022-04-12
申请号：US17156136
申请日：2021-01-22
申请人： Sony Corporation
发明人： Minoru Yamaga , Noboru Sekiguchi
IPC分类号： G11B5/66 , G11B23/03 , G11B5/706 , G11B5/133 , G11B5/596 , G11B5/714 , G11B5/73 , G11B5/735 , G11B15/06 , G11B5/702 , G11B5/733 , G11B5/78
摘要： A magnetic recording medium is provided and includes a substrate; and a magnetic layer provided over the substrate, wherein (wmax−wmin)/wmin≤400 [ppm] . . . (1) where wmax and wmin are respectively maximum and minimum of average values of width corresponding to samples of magnetic recording medium measured after the samples are stored for two hours under storage conditions (a loading tension in the longitudinal direction of the magnetic recording medium, a temperature and a relative humidity) for each of the samples, and a width of a sample of the magnetic recording medium at 25° C. and 50% relative humidity and without loading is ½ inch, magnetic recording medium has Young's modulus of less than 8.0 GPa in a longitudinal direction, and 4.0≤TB/(TA−TB) . . . (2) where TA is average thickness of magnetic recording medium and TB is average thickness of substrate.
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公开(公告)号：US11250880B2
公开(公告)日：2022-02-15
申请号：US16627600
申请日：2018-04-13
申请人： Sony Corporation
发明人： Toshiaki Miura , Satoru Abe , Yuuko Kamoshita , Riku Yoshida
摘要： A magnetic recording medium includes: a substrate that is long in shape; and a magnetic layer containing magnetic powder and a binder. The glass transition point of the binder is not lower than 75° C. In a case where atomic force microscope observation images in a 10 μm×10 μm rectangular shape are acquired at five locations randomly selected from the surface on the side of the magnetic layer, any linear protrusion that is 3 nm to 20 nm in height, is 0.3 μm to 1.0 μm in width, and extends across two sides of the observation image does not exist in the observation images of four locations among the acquired observation images of the five locations.
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公开(公告)号：US20220036918A1
公开(公告)日：2022-02-03
申请号：US17500337
申请日：2021-10-13
申请人： FUJIFILM Corporation
发明人： Norihito KASADA
摘要： The magnetic recording medium includes a non-magnetic support; and a magnetic layer including ferromagnetic powder and a binding agent on the non-magnetic support, in which an isoelectric point of a surface zeta potential of the magnetic layer is equal to or greater than 5.5.
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公开(公告)号：US11235608B2
公开(公告)日：2022-02-01
申请号：US16781229
申请日：2020-02-04
申请人： FUJI XEROX CO., LTD.
摘要： A method for forming a printed material includes forming an image on a recording medium; applying particles to a surface of the recording medium, the surface having the image formed thereon; heating the particles applied to the recording medium; and pressurizing, in a thickness direction, a multilayer body obtained by folding the recording medium so that the heated particles are sandwiched between flaps of the recording medium or a multilayer body obtained by placing another medium on top of the recording medium with the heated particles therebetween. The particles contain a styrene resin and a (meth)acrylic acid ester resin. The (meth)acrylic acid ester resin contains two (meth)acrylic acid ester monomer units, and a mass ratio of the (meth)acrylic acid ester monomer units relative to a total of polymerization components is 90 mass % or more.
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公开(公告)号：US11170812B2
公开(公告)日：2021-11-09
申请号：US16555571
申请日：2019-08-29
申请人： FUJIFILM Corporation
发明人： Kenji Naoi , Masashi Shirata , Wataru Kikuchi
摘要： A magnetic recording medium, a composition for it, and a magnetic recording and reproducing apparatus are provided. The medium includes a non-magnetic support; and a magnetic layer including a ferromagnetic powder and a binding agent on the support. The magnetic layer also includes a compound including one or more partial structures selected from partial structures represented by Formulas 1 and 2, and a polyalkyleneimine chain. The composition for the recording medium includes a ferromagnetic powder and the compound. In Formulas 1 and 2, L1 and L2 each independently represents a divalent linking group, Z1 and Z2 each independently represents a monovalent group represented by —OM or a monovalent group represented by —O−A+, M represents a hydrogen atom or an alkali metal atom, and A+ represents an ammonium cation.
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公开(公告)号：US11158340B2
公开(公告)日：2021-10-26
申请号：US16546161
申请日：2019-08-20
发明人： Richard Bradshaw
摘要： In one general approach, a product includes an underlayer of a magnetic recording medium. The underlayer has encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A magnetic recording layer is formed above the underlayer. In another general approach, a product includes an electrically conductive underlayer of a magnetic recording medium. The underlayer has encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an aromatic polymer, and a polymeric binder binding the encapsulated nanoparticles. A magnetic recording layer is formed above the underlayer. The magnetic nanoparticles have an average magnetic field strength of less than 200 Oersted (Oe). An average concentration of the encapsulated nanoparticles in the underlayer is at least 35 vol %.
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公开(公告)号：US11158339B2
公开(公告)日：2021-10-26
申请号：US16546123
申请日：2019-08-20
发明人： Richard Bradshaw
IPC分类号： G11B5/70 , G11B5/714 , G11B5/716 , G11B5/65 , G11B5/842 , G11B5/725 , G11B5/706 , G11B5/702 , G11B5/78 , B82Y30/00
摘要： A product, according to one approach, includes a recording layer. The recording layer includes encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an encapsulating layer. A polymeric binder binds the encapsulated nanoparticles. A product, according to another approach, includes a recording layer. The recording layer includes encapsulated nanoparticles each comprising a magnetic nanoparticle encapsulated by an encapsulating layer, and a polymeric binder binding the encapsulated nanoparticles. An average diameter of the magnetic nanoparticles is in a range of 2 nanometers to 20 nanometers. An average thickness of the recording layer is less than 0.2 microns.
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公开(公告)号：US11120827B2
公开(公告)日：2021-09-14
申请号：US15719318
申请日：2017-09-28
IPC分类号： G11B5/702
摘要： According to one embodiment, a magnetic recording medium includes: a substrate; an underlayer positioned above the substrate; a magnetic recording layer positioned above the underlayer; and a plurality of conductive polymers dispersed within the substrate, the underlayer, the magnetic recording layer, the substrate and the underlayer, the substrate and the magnetic recording layer, the underlayer and the magnetic recording layer, or the underlayer, the magnetic recording layer, and the substrate. In addition, the conductive polymers are dispersed such that a concentration of the conductive polymers has a gradient in a single one of the layers in a thickness direction.
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19.发明授权公开(公告)号：US10978105B2
公开(公告)日：2021-04-13
申请号：US16143747
申请日：2018-09-27
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada
摘要： Provided are a magnetic recording medium, in which a magnetic layer includes a ferromagnetic hexagonal ferrite powder, a binding agent, and an oxide abrasive, an intensity ratio Int(110)/Int(114) 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 recording medium is 0.65 to 1.00, a contact angle with respect to 1-bromonaphthalene measured regarding a surface of the magnetic layer is 50.0° to 55.0°, and an average particle diameter of the oxide abrasive obtained from a secondary ion image obtained by irradiating the surface of the magnetic layer with a focused ion beam is 0.04 μm to 0.08 μm, and a magnetic recording and reproducing device including this magnetic recording medium.
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公开(公告)号：US10811048B2
公开(公告)日：2020-10-20
申请号：US16777279
申请日：2020-01-30
申请人： FUJIFILM Corporation
发明人： Eiki Ozawa , Norihito Kasada , Atsushi Musha
IPC分类号： G11B15/18 , G11B5/706 , G11B20/12 , G11B5/584 , G11B5/708 , G11B5/702 , G11B23/50 , G01B11/06 , G11B20/10 , G11B5/39 , G11B5/78 , G11B27/022 , G11B5/71 , G11B5/00 , B82Y25/00 , B82Y10/00
摘要： The magnetic tape includes a non-magnetic support and a magnetic layer, in which the magnetic layer has a timing-based servo pattern, an edge shape of the timing-based servo pattern, specified by magnetic force microscopy is a shape in which a difference between a value L99.9 of a cumulative distribution function of 99.9% and a value L0.1 of a cumulative distribution function of 0.1% in a position deviation width from an ideal shape of the magnetic tape in a longitudinal direction is 180 nm or less, and a difference between a spacing S0.5 measured, after n-hexane cleaning, on a surface of the magnetic layer under a pressure of 0.5 atm by optical interferometry and a spacing S13.5 measured, after n-hexane cleaning, under a pressure of 13.5 atm is 3.0 nm or less, and S0.5 is 5.0 nm or more.
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