Chemically Identified Underlayer Binder Patents (Class 428/840.5)
  • Patent number: 11183209
    Abstract: A magnetic recording medium in a shape of a tape that is long in a longitudinal direction and is short in a width direction is provided, the medium including: a base material; and a magnetic layer, in which the magnetic layer includes a data band long in the longitudinal direction in which a data signal is to be written, and a servo band long in the longitudinal direction in which a servo signal is written, and in the magnetic layer, a degree of vertical orientation is greater than or equal to 65%, a half width of a solitary waveform in a reproduction waveform of the servo signal is less than or equal to 195 nm, a thickness of the magnetic layer is less than or equal to 90 nm, and a thickness of the base material is less than or equal to 4.2 ?m.
    Type: Grant
    Filed: February 18, 2019
    Date of Patent: November 23, 2021
    Assignee: Sony Corporation
    Inventors: Minoru Yamaga, Tooru Sato, Toshiaki Miura, Takanobu Iwama, Jun Takahashi
  • Patent number: 8795858
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
    Type: Grant
    Filed: March 18, 2011
    Date of Patent: August 5, 2014
    Assignee: FUJIFILM Corporation
    Inventors: Masahide Sato, Katsumi Araki, Kazufumi Omura, Tomohiro Ichikawa, Shinji Tsujimoto, Tadahiro Ooishi
  • Patent number: 8617728
    Abstract: An aspect of the present invention relates to a magnetic tape comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition. The nonmagnetic layer has a thickness ranging from 0.5 to 1.3 ?m. The relation between the nonmagnetic powder and the binder component contained in the radiation-curable composition satisfies equation (I): 480?(BET specific surface area of the nonmagnetic powder (m2/g)×weight of the nonmagnetic powder (g))/weight of the binder component (g)?650??(I).
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: December 31, 2013
    Assignee: FUJIFILM Corporation
    Inventors: Shinji Tsujimoto, Katsumi Araki, Tomohiro Ichikawa
  • Patent number: 8603652
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising on one surface of a nonmagnetic support a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order, as well as comprising a backcoat layer on the other surface of the nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition, and the backcoat layer comprises filler particles with an average primary particle diameter, D50, ranging from 0.05 to 1.0 ?m, the filler particles being selected from the group consisting of organic polymer particles and inorganic colloidal particles.
    Type: Grant
    Filed: March 9, 2011
    Date of Patent: December 10, 2013
    Assignee: FUJIFILM Corporation
    Inventors: Tadashi Ishiguro, Katsumi Araki, Kenichi Nakamura
  • Publication number: 20110274947
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising on one surface of a nonmagnetic support a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order, as well as comprising a backcoat layer on the other surface of the nonmagnetic support. The nonmagnetic layer is a radiation-cured layer formed by curing with radiation a given radiation-curable composition, and the backcoat layer comprises filler particles with an average primary particle diameter, D50, ranging from 0.05 to 1.0 ?m, the filler particles being selected from the group consisting of organic polymer particles and inorganic colloidal particles.
    Type: Application
    Filed: March 9, 2011
    Publication date: November 10, 2011
    Applicant: FUJIFILM CORPORATION
    Inventors: Tadashi ISHIGURO, Katsumi ARAKI, Kenichi NAKAMURA
  • Publication number: 20110255193
    Abstract: According to one embodiment, a magnetic recording medium includes a data region and a servo region adjacent to the data region and including a magnetic recording layer, the magnetic recording layer including first and second patterned regions adjacent to each other, the first patterned region including a first nonmagnetic matrix and first magnetic particles dispersed in the first nonmagnetic matrix and having magnetization oriented in a first direction, the second patterned region includes a second nonmagnetic matrix and second magnetic particles dispersed in the second nonmagnetic matrix and having magnetization oriented in a second direction opposite to the first direction, sizes of the first magnetic particles being smaller than sizes of the second magnetic particles.
    Type: Application
    Filed: March 25, 2011
    Publication date: October 20, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Hiroyuki Hieda
  • Publication number: 20110244270
    Abstract: An aspect of the present invention relates to a binder composition for a magnetic recording medium, which comprises a vinyl copolymer comprising a structural unit denoted by general formula [1]: wherein, in general formula [1], R1 denotes a hydrogen atom, a halogen atom, or a methyl group, L1 denotes a single bond or a divalent linking group, and Y an alicyclic group; a structural unit denoted by general formula [2]: wherein, in general formula [2], R2 denotes a hydrogen atom, a halogen atom, or a methyl group, L2 denotes a single bond or a divalent linking group, and Z denotes a hydrocarbon group with a carbon number ranging from 8 to 50; and a structural unit denoted by general formula [3]: wherein, in general formula [3], R3 denotes a hydrogen atom, a halogen atom, or a methyl group, and L3 denotes a single bond or a divalent linking group.
    Type: Application
    Filed: March 31, 2011
    Publication date: October 6, 2011
    Applicant: FUJIFILM CORPORATION
    Inventors: Masataka YOSHIZAWA, Ayako MATSUMOTO, Satoshi MATSUBAGUCHI
  • Publication number: 20110229741
    Abstract: An aspect of the present invention relates to a magnetic recording medium comprising a nonmagnetic layer containing a nonmagnetic powder and a binder and a magnetic layer containing a ferromagnetic powder and a binder in this order on a nonmagnetic support, wherein the binder of the magnetic layer is a mixture of a vinyl chloride copolymer, polyurethane resin, and polyisocyanate, the polyurethane resin having a glass transition temperature ranging from 90 to 130° C. and a storage elastic modulus at 80° C. ranging from 2.5 to 5.0 GPa, the nonmagnetic layer is a radiation-cured layer formed by curing with radiation a radiation-curable composition comprising a nonmagnetic powder and a binder component, the binder component comprising a radiation-curable vinyl chloride copolymer and a radiation-curable polyurethane resin, and the radiation-curable vinyl chloride copolymer and radiation-curable polyurethane resin both have glass transition temperatures ranging from 30 to 100° C.
    Type: Application
    Filed: March 18, 2011
    Publication date: September 22, 2011
    Applicant: FUJIFILM CORPORATION
    Inventors: Masahide SATO, Katsumi ARAKI, Kazufumi OMURA, Tomohiro ICHIKAWA, Shinji TSUJIMOTO, Tadahiro OOISHI
  • Patent number: 7754355
    Abstract: A magnetic recording medium is provided that includes a non-magnetic support, a radiation-cured layer cured by exposing a layer containing a radiation curing compound to radiation, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder. The radiation-cured layer and the magnetic layer are provided in that order above the non-magnetic support. The radiation curing compound has a C2 to C18 alkyl group, a C6 to C10 cyclic structure, and two or more radiation curing functional groups per molecule.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: July 13, 2010
    Assignee: FUJIFILM Corporation
    Inventors: Yuichiro Murayama, Hiroshi Hashimoto
  • Patent number: 7638212
    Abstract: A magnetic recording medium is provided that comprises a non-magnetic support and, in order thereabove, a radiation-cured layer cured by exposing a layer comprising a radiation curing compound to radiation, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder, the radiation curing compound having a radiation curing functional group in the molecule and being derived from a diisocyanate that has a branched structure but does not have a cyclic structure.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: December 29, 2009
    Assignee: FUJIFILM Corporation
    Inventors: Yuichiro Murayama, Hiroshi Hashimoto
  • Publication number: 20070287033
    Abstract: A magnetic recording medium is provided that comprises a non-magnetic support and, in order thereabove, a radiation-cured layer cured by exposing a layer comprising a radiation curing compound and a chain transfer agent to radiation, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder.
    Type: Application
    Filed: June 7, 2007
    Publication date: December 13, 2007
    Applicant: FUJIFILM Corporation
    Inventors: Yoshihiro Nakai, Hiroshi Hashimoto
  • Publication number: 20070287032
    Abstract: A magnetic recording medium is provided that comprises a non-magnetic support and, in order thereabove, a radiation-cured layer (H) cured by exposing a layer comprising a conductive polymer (E) and a radiation curing monomer (C) to radiation, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder.
    Type: Application
    Filed: June 6, 2007
    Publication date: December 13, 2007
    Applicant: FUJIFILM Corporation
    Inventors: Yoshihiro NAKAI, Hiroshi Hashimoto
  • Patent number: 7282279
    Abstract: A magnetic recording medium is provided that includes a non-magnetic support and, in order, above the non-magnetic support, a radiation-cured material layer cured by exposing a layer that includes a radiation curable compound to radiation, and a magnetic layer that includes a fine ferromagnetic powder and a binder, a compound having one or more ether groups and three or more radiation curable functional groups per molecule being employed as the radiation curable compound, and the number of magnetic layer surface micro projections having a height measured by atomic force microscopy (AFM) of 10 to 20 nm being 5 to 1,000 per 100 (?m)2. There is also provided the magnetic recording medium wherein it further includes a non-magnetic layer that includes a non-magnetic powder and a binder.
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: October 16, 2007
    Assignee: Fujifilm Corporation
    Inventors: Yuichiro Murayama, Hiroshi Hashimoto
  • Publication number: 20070190366
    Abstract: A magnetic recording medium is provided that comprises a non-magnetic support and, in order thereabove, a radiation-cured layer cured by exposing a layer comprising a radiation curing compound to radiation, and a magnetic layer comprising a ferromagnetic powder dispersed in a binder, the radiation curing compound having a radiation curing functional group concentration of at least 2 mmol/g but no greater than 6 mmol/g, and the radiation-cured layer comprising at least 30 vol % but no greater than 60 vol % of an inorganic powder.
    Type: Application
    Filed: January 23, 2007
    Publication date: August 16, 2007
    Applicant: FUJIFILM Corporation
    Inventors: Yuichiro Murayama, Hiroshi Hashimoto
  • Patent number: 7229708
    Abstract: A magnetic encoder, which comprises a stainless steel sheet; and an under coat adhesive containing epoxy resin and organopolysiloxane, a top coat adhesive containing phenol resin, or phenol resin and epoxy resin, and a rubber magnet, as successively laid one upon another on the stainless steel sheet, has distinguished water resistance and saline water resistance, and thus can be effectively used particularly as a magnetic encoder in wheel speed sensors.
    Type: Grant
    Filed: September 12, 2003
    Date of Patent: June 12, 2007
    Assignee: NOK Corporation
    Inventors: Katsumi Abe, Kiyofumi Fukasawa, Hironori Nishina
  • Patent number: 7201978
    Abstract: A magnetic recording medium contains a non-magnetic substrate, a non-magnetic layer arranged on or above one side of the non-magnetic substrate and containing a non-magnetic powder, a carbon black and a binder resin, and a magnetic layer being arranged on or above the non-magnetic layer and containing a ferromagnetic powder and a binder resin, in which the binder resin of the non-magnetic layer contains an electron-beam-curable resin having an adsorption with respect to the non-magnetic powder of less than 2.2 mg per square meter in terms of a specific surface area determined according to a BET method. The magnetic recording medium can carry out high-density recording and exhibits improved electromagnetic conversion properties and a reduced error rate.
    Type: Grant
    Filed: November 26, 2004
    Date of Patent: April 10, 2007
    Assignee: TDK Corporation
    Inventors: Hiroyuki Tanaka, Shigeo Kurose
  • Patent number: 7108927
    Abstract: The present invention relates to a magnetic recording medium comprising a magnetic layer on at least one side of a nonmagnetic substrate, the magnetic layer containing magnetic particles of a CuAu type or Cu3Au type ferromagnetic ordered phase, wherein a conductive layer is provided on at least one side of the nonmagnetic substrate.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: September 19, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yasushi Hattori, Koukichi Waki
  • Patent number: 7056607
    Abstract: Provided is a magnetic recording medium permitting the controlling of backcoat layer transfer to a magnetic layer surface, a reduction in dropout even when employing microgranular magnetic material, as well as good running stability, durability, and storage properties. The magnetic recording medium has a magnetic layer with a ferromagnetic powder and a binder on one surface of a nonmagnetic support and a backcoat layer with a nonmagnetic powder and a binder on the other surface of the nonmagnetic support. The nonmagnetic powder is an acicular particle having a mean particle diameter of 5 to 300 nm, and the backcoat layer includes water-soluble cations in a quantity of 100 ppm or less and water-soluble anions in a quantity of 150 ppm or less.
    Type: Grant
    Filed: March 29, 2004
    Date of Patent: June 6, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Noboru Zinbo, Noriko Inoue
  • Patent number: 7041395
    Abstract: A magnetic recording medium is provided which includes, in order on a non-magnetic support, a radiation-cured layer formed by curing a layer containing a radiation curing compound by exposure to radiation, a middle layer having a non-magnetic powder dispersed in a binder (1), the middle layer being provided as necessary, and at least one magnetic layer having a ferromagnetic fine powder dispersed in a binder (2). The radiation curing compound has a hydroxyl group and a radiation curing functional group in the molecule, and the number of micro projections on the surface of the magnetic layer having a height of 10 to 20 nm measured by atomic force microscopy (AFM) is 5 to 1,000/100 (?m)2.
    Type: Grant
    Filed: March 25, 2004
    Date of Patent: May 9, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Yuichiro Murayama, Hiroshi Hashimoto
  • Patent number: 7005203
    Abstract: Provided is a magnetic recording medium that exhibits excellent electromagnetic characteristics especially in recording and reproducing systems using an MR head, as well as has excellent long-term preservation property. The magnetic recording medium comprises a lower layer comprising a nonmagnetic powder or a ferromagnetic powder and a binder and at least one magnetic layer thereover comprising a ferromagnetic powder and a binder on a support.
    Type: Grant
    Filed: September 4, 2003
    Date of Patent: February 28, 2006
    Assignee: Fuji Photo Film Co., Ltd.
    Inventors: Satoshi Matsubaguchi, Yuichiro Murayama