Patents by Inventor Hideo Maehata

Hideo Maehata has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10196538
    Abstract: A thermosetting powder coating material includes powder particles that include a core which contains a thermosetting resin and a thermosetting agent having a blocked isocyanate group and a resin coating portion which contains a thermosetting resin having a glass transition temperature of equal to or higher than 45° C. and coats a surface of the core, and satisfy the followings (1) to (4): (1) a volume particle diameter distribution index GSDv of the powder particles is equal to or less than 1.50; (2) an average circularity of the powder particles is equal to or greater than 0.96; (3) a melting temperature of the powder particles measured according to a ½ method by using a flow tester is from 90° C. to 115° C.; and (4) an exothermic peak is within a range of from 80° C. to 150° C. in a differential scanning calorimetry measurement of the powder particles.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: February 5, 2019
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Hideo Maehata, Susumu Yoshino
  • Patent number: 10100205
    Abstract: A powder coating material includes powder particles that include a binder resin, have an average circularity of 0.97 or greater, and have a coloring pigment provided on a surface of the powder particles.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: October 16, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Susumu Yoshino, Masato Mikami, Hideo Maehata
  • Patent number: 9946183
    Abstract: A liquid developer includes metallic particles that may be surface-treated using an insulating material, and a carrier liquid.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: April 17, 2018
    Assignee: FUJI XEROX CO., LTD.
    Inventors: Takeshi Agata, Hideo Maehata, Tatsuo Okuno
  • Publication number: 20160280953
    Abstract: A thermosetting powder coating material includes powder particles that include a core which contains a thermosetting resin and a thermosetting agent having a blocked isocyanate group and a resin coating portion which contains a thermosetting resin having a glass transition temperature of equal to or higher than 45° C. and coats a surface of the core, and satisfy the followings (1) to (4): (1) a volume particle diameter distribution index GSDv of the powder particles is equal to or less than 1.50; (2) an average circularity of the powder particles is equal to or greater than 0.96; (3) a melting temperature of the powder particles measured according to a ½ method by using a flow tester is from 90° C. to 115° C.; and (4) an exothermic peak is within a range of from 80° C. to 150° C. in a differential scanning calorimetry measurement of the powder particles.
    Type: Application
    Filed: July 28, 2015
    Publication date: September 29, 2016
    Inventors: Hideo MAEHATA, Susumu YOSHINO
  • Publication number: 20160230021
    Abstract: A powder coating material includes powder particles that include a binder resin, have an average circularity of 0.97 or greater, and have a coloring pigment provided on a surface of the powder particles.
    Type: Application
    Filed: July 9, 2015
    Publication date: August 11, 2016
    Inventors: Susumu YOSHINO, Masato MIKAMI, Hideo MAEHATA
  • Publication number: 20150277258
    Abstract: A liquid developer includes metallic particles that may be surface-treated using an insulating material, and a carrier liquid.
    Type: Application
    Filed: September 2, 2014
    Publication date: October 1, 2015
    Inventors: Takeshi AGATA, Hideo MAEHATA, Tatsuo OKUNO
  • Patent number: 8628903
    Abstract: An electrostatic charge image developing toner includes: a polyester resin containing a graft copolymer, the graft copolymer being formed with a polyester skeleton as a main chain and block copolymers containing a styrene-based polymer block and a crystalline acrylate-based polymer block. The styrene-based polymer block is grafted onto the polyester skeleton.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: January 14, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Maehata, Fumiaki Mera, Kousaku Yoshimura
  • Patent number: 8541153
    Abstract: A toner for developing an electrostatic image contains at least one of an oxidation polymerizable monomer and a polymer having an ethylenically unsaturated group, and an oxidation polymerization catalyst in a form of a composite with inorganic particles, wherein a temperature T(10 Mpa) and a temperature T(1 Mpa) satisfies the following expression (1): 20° C.?T(1 MPa)?T(10 MPa)??(1) wherein, the temperature T(10 Mpa) is a temperature at which a viscosity of the toner under a pressure of 10 Mpa applied with a flow tester becomes 104 Pa·s, and the temperature T(1 Mpa) is a temperature at which a viscosity of the toner under a pressure of 1 Mpa applied with a flow tester becomes 104 Pa·s.
    Type: Grant
    Filed: August 30, 2010
    Date of Patent: September 24, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Hirotaka Matsuoka, Hideo Maehata, Yuki Sasaki, Fumiaki Mera
  • Patent number: 8372574
    Abstract: A method of producing an electrostatic latent image developing toner includes: preparing a resin particle dispersion by polymerizing, in a water-based solvent, a polymerizable monomer that comprises a polymerizable monomer comprising a vinyl-based double bond; extracting a liquid from the resin particle dispersion by heating; mixing the distilled resin particle dispersion with a colorant particle dispersion prepared by dispersing a colorant; and aggregating the resin particles, the pigment particles and a release agent particles to form aggregate particles, and then conducting heating to fuse the aggregate particles.
    Type: Grant
    Filed: October 4, 2011
    Date of Patent: February 12, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Maehata, Yukihiro Ishii, Masaaki Suwabe, Tsutomu Kubo, Makiko Nakano, Kazuhiko Yanagida, Yasuo Matsumura
  • Publication number: 20130017481
    Abstract: An electrostatic charge image developing toner includes: a polyester resin containing a graft copolymer, the graft copolymer being formed with a polyester skeleton as a main chain and block copolymers containing a styrene-based polymer block and a crystalline acrylate-based polymer block. The styrene-based polymer block is grafted onto the polyester skeleton.
    Type: Application
    Filed: January 30, 2012
    Publication date: January 17, 2013
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hideo MAEHATA, Fumiaki MERA, Kousaku YOSHIMURA
  • Patent number: 8343703
    Abstract: An electrostatic image developing toner, includes: a block copolymer that contains: a block A that has a glass transition temperature of about 60° C. or more; and a crystalline block B that has a melting point of about 25° C. or more derived from an ethylenically unsaturated compound, wherein the block copolymer satisfies the following equations (1) to (3): 30° C.?[T(0.5 MPa)?T(30 MPa)]?80° C.??(1) 60° C.?T(0.5 MPa)??(2) T(30 MPa)?80° C.??(3) wherein T(0.5 MPa) represents a temperature at which a viscosity of the block copolymer is 104 Pa·s when a pressure applied by a flow tester is 0.5 MPa; and T(30 MPa) represents a temperature at which a viscosity of the block copolymer is 104 Pa·s when a pressure applied by a flow tester is 30 MPa.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: January 1, 2013
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Maehata, Yasuo Matsumura, Takashi Imai
  • Patent number: 8338067
    Abstract: An electrostatic image developer is provided, the electrostatic image developer including: a carrier for an electrostatic image developer, the carrier including a core particle which has a plurality of projections on a surface of the core particle; and electrostatic image developing toners, wherein the electrostatic image developer satisfies following relationships of formulae (1) and (2): 0.5t<H??(1) 21/2t<L<5t??(2) wherein t represents a volume average particle diameter (?m) of the toners; H represents an average height difference (?m) in the recesses and projections of the core particle; and L represents an average distance (?m) between the projections.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: December 25, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Susumu Yoshino, Hideo Maehata, Satoshi Hiraoka
  • Patent number: 8309292
    Abstract: A polyester resin for electrostatic image developing toner includes: two or more polyester blocks, and the polyester resin satisfying the following conditions (A) to (C): (A) an ester concentration of the polyester resin is about 0.01 or more and less than about 0.1; (B) a weight average molecular weight of the polyester resin is about 24,000 or more; and (C) a difference in SP values of at least two kinds of the two or more polyester blocks is about 0.1 to about 0.7.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: November 13, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yuki Sasaki, Masaki Hirakata, Hideo Maehata, Hirotaka Matsuoka
  • Patent number: 8182973
    Abstract: An electrostatic-image-developing toner is obtained by aggregating: resin particles, each of which has a core-shell structure, in which a difference in glass transition temperature between a resin constituting the core and a resin constituting the shell is about 20° C. or more; and releasing agent particles, each of which includes a polyester block copolymer having a weight-average molecular weight of about 3,000 or less and containing a non-crystalline polyester block containing a cyclic structure in the main chain and a crystalline polyester block containing no cyclic structure in the main chain.
    Type: Grant
    Filed: March 13, 2009
    Date of Patent: May 22, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Yasuo Matsumura, Hirotaka Matsuoka, Hideo Maehata, Takashi Imai
  • Patent number: 8133648
    Abstract: An electrostatic image developing toner includes a binder resin that includes a polyester carbonate resin or a polyester amide resin, the polyester carbonate resin or the polyester amide resin containing a dodecenylsuccinic acid unit in an mount from about 0.5 mol % to about 30 mol % as a monomer unit; and a colorant.
    Type: Grant
    Filed: September 10, 2008
    Date of Patent: March 13, 2012
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Maehata, Hirotaka Matsuoka, Yasuo Matsumura
  • Publication number: 20120028187
    Abstract: A method of producing an electrostatic latent image developing toner includes: preparing a resin particle dispersion by polymerizing, in a water-based solvent, a polymerizable monomer that comprises a polymerizable monomer comprising a vinyl-based double bond; extracting a liquid from the resin particle dispersion by heating; mixing the distilled resin particle dispersion with a colorant particle dispersion prepared by dispersing a colorant; and aggregating the resin particles, the pigment particles and a release agent particles to form aggregate particles, and then conducting heating to fuse the aggregate particles.
    Type: Application
    Filed: October 4, 2011
    Publication date: February 2, 2012
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Hideo MAEHATA, Yukihiro Ishii, Masaaki Suwabe, Tsutomu Kubo, Makiko Nakano, Kazuhiko Yanagida, Yasuo Matsumura
  • Publication number: 20110171572
    Abstract: A toner for developing an electrostatic image contains at least one of an oxidation polymerizable monomer and a polymer having an ethylenically unsaturated group, and an oxidation polymerization catalyst in a form of a composite with inorganic particles, wherein a temperature T(10 Mpa) and a temperature T(1 Mpa) satisfies the following expression (1): 20° C.?T(1 MPa)?T(10 MPa)??(1) wherein, the temperature T(10 Mpa) is a temperature at which a viscosity of the toner under a pressure of 10 Mpa applied with a flow tester becomes 104 Pa·s, and the temperature T(1 Mpa) is a temperature at which a viscosity of the toner under a pressure of 1 Mpa applied with a flow tester becomes 104 Pa·s.
    Type: Application
    Filed: August 30, 2010
    Publication date: July 14, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Yasuo MATSUMURA, Hirotaka MATSUOKA, Hideo MAEHATA, Yuki SASAKI, Fumiaki MERA
  • Patent number: 7972757
    Abstract: A resin for an electrostatic-image-developing toner includes a graft polymer, wherein the graft polymer has a polyester structure in the main chain thereof; the graft polymer includes monomer units derived from vinyl monomers in the side chains thereof; and at least a part of the monomer units have a residue of surfactant.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: July 5, 2011
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Maehata, Hirotaka Matsuoka, Fumiaki Mera
  • Patent number: 7955774
    Abstract: An electrostatic image developing toner comprising a non-crystalline polyester resin, wherein the non-crystalline polyester resin is obtained by copolymerizing monomers in the presence of a titanium catalyst; the monomers comprise a polyhydric alcohol component and a monomer containing a sulfonic acid group, the polyhydric alcohol component comprises a propylene oxide adduct of bisphenol A, a ratio of an amount of the monomer containing a sulfonic acid group to the total amount of the non-crystalline polyester resin is 0.1 mol % to 20 mol %, and a content of titanium is 1 ppm to 1000 ppm by weight based on the amount of the resin. The invention also provides a method for producing the same, an electrostatic image developer and image forming method using the toner.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: June 7, 2011
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Hideo Maehata, Susumu Yoshino, Noriyuki Mizutani, Satoshi Yoshida
  • Publication number: 20110020746
    Abstract: An electrostatic image developer is provided, the electrostatic image developer including: a carrier for an electrostatic image developer, the carrier including a core particle which has a plurality of projections on a surface of the core particle; and electrostatic image developing toners, wherein the electrostatic image developer satisfies following relationships of formulae (1) and (2): 0.5t<H??(1) 21/2t<L<5t??(2) wherein t represents a volume average particle diameter (?m) of the toners; H represents an average height difference (?m) in the recesses and projections of the core particle; and L represents an average distance (?m) between the projections.
    Type: Application
    Filed: March 26, 2010
    Publication date: January 27, 2011
    Applicant: FUJI XEROX CO., LTD.
    Inventors: Susumu YOSHINO, Hideo Maehata, Satoshi Hiraoka