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公开(公告)号:US20250014603A1
公开(公告)日:2025-01-09
申请号:US18758784
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Ryosuke YUMIYAMA , Norihito KASADA , Nobuhito ONOZUKA , Junya SAWADA
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. An arithmetic average curvature Spc of a peak point specified in ISO 25178 on a surface of the magnetic layer is 0.30 (1/μm) or more and 0.70 (1/μm) or less, and standard deviation a of the Spc in a width direction of the surface of the magnetic layer is 0.15 (1/μm) or less.
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2.
公开(公告)号:US20250078869A1
公开(公告)日:2025-03-06
申请号:US18820883
申请日:2024-08-30
Applicant: FUJIFILM Corporation
Inventor: Wataru KIKUCHI , Yutaka NOZOE , Nobuhito ONOZUKA
Abstract: The magnetic recording medium includes a silicon-containing compound having a partial structure represented by Formula 1 (hereinafter, also simply referred to as a “silicon-containing compound”) in a portion on a non-magnetic support on a magnetic layer side. In Formula 1, R11, R12, and R13 each independently represent a monovalent substituent, L11 represents an (n+1)-valent linking group, n represents an integer of 2 or more, and * represents a position at which the partial structure represented by Formula 1 is bonded to another partial structure constituting the silicon-containing compound.
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公开(公告)号:US20250014604A1
公开(公告)日:2025-01-09
申请号:US18758395
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Norihito KASADA , Nobuhito ONOZUKA , Junya SAWADA , Ryosuke YUMIYAMA
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. Sci obtained by measuring a surface of the magnetic layer with an atomic force microscope and by Equation A is 1.40 or more and 1.60 or less, and standard deviation σ of the Sci in a width direction of the surface of the magnetic layer is 0.05 or less. In Equation A, Sq is a root-mean-square height Sq specified in ISO 25178, Vv(h0.05)-Vv(h0.8) is a void volume in a region where a load area ratio in a bearing curve is 5% or more and 80% or less, and A is a measurement region area. Sci = ( Vv ( h 0.05 ) - Vv ( h 0.8 ) A ) / Sq Equation A
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公开(公告)号:US20250006225A1
公开(公告)日:2025-01-02
申请号:US18759153
申请日:2024-06-28
Applicant: FUJIFILM Corporation
Inventor: Junya SAWADA , Norihito KASADA , Nobuhito ONOZUKA , Ryosuke YUMIYAMA
Abstract: The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. A magnetic tape cartridge and a magnetic tape apparatus include the magnetic tape. A dale void volume Vvv specified in ISO 25178 on a surface of the magnetic layer is 0.100 nm3 or more and 0.350 nm3 or less, and standard deviation a of the Vvv in a width direction of the surface of the magnetic layer is 0.020 nm3 or less.
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5.
公开(公告)号:US20240355356A1
公开(公告)日:2024-10-24
申请号:US18644255
申请日:2024-04-24
Applicant: FUJIFILM CORPORATION
Inventor: Wataru KIKUCHI , Nobuhito ONOZUKA
CPC classification number: G11B5/7358 , G11B5/73923 , G11B5/78
Abstract: The magnetic recording medium includes a non-magnetic support; and a magnetic layer containing a ferromagnetic powder, in which a nitrogen-containing polymer is included in a portion on the non-magnetic support on a magnetic layer side, the nitrogen-containing polymer contains a fluorine-containing group and a polyester chain, the fluorine-containing group is bonded to a nitrogen atom of the nitrogen-containing polymer, the polyester chain is bonded to the nitrogen atom of the nitrogen-containing polymer or forms a salt crosslinking structure with the nitrogen atom of the nitrogen-containing polymer, and a contact angle with water, which is measured on a surface of the magnetic layer after hexane cleaning, is 90° or more.
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