Patents by Inventor Takaaki Yodo
Takaaki Yodo 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).
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Publication number: 20160194508Abstract: A nonaqueous inkjet ink composition contains binder resin, pigment, pigment dispersant, and organic solvent. The organic solvent contains 40 to 80 percent by mass of the nonaqueous inkjet ink composition of diethylene glycol ethyl methyl ether and 7 to 50 percent by mass of the nonaqueous inkjet ink composition of propylene carbonate. Compositions that contain acetylene agent are excluded. The nonaqueous inkjet ink composition offers excellent wettability, fixing property, and discharge stability even when printed at high speed on targets whose printing surface is constituted by polyvinyl chloride, ethylene-vinyl acetate copolymer, or other vinyl polymer.Type: ApplicationFiled: August 7, 2014Publication date: July 7, 2016Inventors: Takaaki YODO, Tadashi HIROSE, Yoshiyuki AOKI, Jun KINJYO, Takuya OKAMOTO
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Patent number: 8722302Abstract: The present invention provides a method for producing a liquid developer for electrophotography or electrostatic recording obtained by a coacervation method, which sufficiently maintains the charging property and has good dispersion stability of colored resin particles, as well as a liquid developer obtained by the method. A method for producing a liquid developer by a coacervation method, wherein a colored resin particle is dispersed in an insulating hydrocarbon dispersion medium in the presence of a particle dispersant and an acid group-containing resin, and the particle dispersant is a reaction product of a polyamine compound and a self-condensation product of a hydroxycarboxylic acid.Type: GrantFiled: September 26, 2008Date of Patent: May 13, 2014Assignee: Sakata Inx Corp.Inventors: Hirohito Maeda, Katsutoshi Okamoto, Takaaki Yodo, Naoya Inazumi, Koji Iwase
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Patent number: 8399170Abstract: Production process for a liquid developer for use in electrophotograph or electrostatic recording by coacervation method. The process can produce a liquid developer in which a coloring agent (e.g., a pigment) is included completely within a resin particle by distillation of a solvent while retaining the state where the coloring agent is finely dispersed and the resulting colored resin particle is small in particle size with excellent dispersion stability, and excellent optical properties.Type: GrantFiled: June 26, 2006Date of Patent: March 19, 2013Assignee: Sakata Inx Corp.Inventors: Koji Iwase, Hirohito Maeda, Takaaki Yodo
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Patent number: 8334341Abstract: An object of the present invention is to provide a carbodiimide type compound having high dispersibility and dispersion stability of pigments, fine resin particles, and pigment-resin composite fine particles particularly in a silicone dispersion medium; a pigment dispersion composition and a pigment-resin composite fine particles-containing dispersion composition preferably usable in a wide range of fields such as inks for solvent ink jet, liquid developers, and the like by using the compound; and a liquid developer using such a pigment dispersion composition and/or pigment-resin composite fine particles-containing dispersion composition. The present invention provides a carbodiimide type compound obtained by introducing a polysiloxane chain by reaction of a functional group of a polysiloxane chain-containing compound having the functional group reactive with a carbodiimide group with a carbodiimide group of a carbodiimide compound having a carbodiimide equivalent weight of 100 to 50000.Type: GrantFiled: March 23, 2006Date of Patent: December 18, 2012Assignee: Sakata INX Corp.Inventors: Hideo Shibata, Koji Iwase, Hirohito Maeda, Takaaki Yodo
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Publication number: 20100323291Abstract: The present invention provides a method for producing a liquid developer for electrophotography or electrostatic recording obtained by a coacervation method, which sufficiently maintains the charging property and has good dispersion stability of colored resin particles, as well as a liquid developer obtained by the method. A method for producing a liquid developer by a coacervation method, wherein a colored resin particle is dispersed in an insulating hydrocarbon dispersion medium in the presence of a particle dispersant and an acid group-containing resin, and the particle dispersant is a reaction product of a polyamine compound and a self-condensation product of a hydroxycarboxylic acid.Type: ApplicationFiled: September 26, 2008Publication date: December 23, 2010Applicant: SAKATA INX CORP.Inventors: Hirohito Maeda, Katsutoshi Okamoto, Takaaki Yodo, Naoya Inazumi, Koji Iwase
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Patent number: 7851117Abstract: It is an object of the present invention to provide a liquid developer in which in liquid developers for electrophotography or electrostatic recording obtained using the coacervation method, electric resistance of the liquid developer and the electrophoretic property or the charging characteristic of the toner particles are adequately maintained, and the dispersibility of a pigment and the dispersion stability of the toner particles are good. A liquid developer formed by dispersing colored resin particles comprising at least a pigment, a dispersant and a resin in a hydrocarbon insulating medium using a coacervation method, wherein said dispersant is a carbodiimide compound having at least one basic nitrogen-containing group and at least one polyester side chain introduced through a reaction with a carbodiimide group in its molecule, and said resin is an acid group-containing resin and the acid value of the resin is 1 to 100.Type: GrantFiled: November 24, 2006Date of Patent: December 14, 2010Assignee: Sakata Inx Corp.Inventors: Takaaki Yodo, Katsutoshi Okamoto, Hideo Shibata, Koji Iwase
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Publication number: 20100136475Abstract: Disclosed is a process for production of a liquid developer for use in electrophotograph or electrostatic recording by coacervation method. The process can produce a liquid developer in which a coloring agent (e.g., a pigment) is included completely within a resin particle by distillation of a solvent while retaining the state where the coloring agent are finely dispersed and the resulting colored resin particle is small in particle size and has an excellent dispersion stability, and which has excellent optical properties.Type: ApplicationFiled: June 26, 2006Publication date: June 3, 2010Inventors: Koji Iwase, Hirohito Maeda, Takaaki Yodo
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Publication number: 20100136474Abstract: Disclosed is a process for production of a liquid developer for use in electrophotograph or electrostatic recording by coacervation method. The process can produce a liquid developer in which a coloring agent (e.g., a pigment) is included completely within a resin particle by distillation of a solvent while retaining the state where the coloring agent are finely dispersed and the resulting colored resin particle is small in particle size and has an excellent dispersion stability, and which has excellent optical properties.Type: ApplicationFiled: June 26, 2006Publication date: June 3, 2010Inventors: Koji Iwase, Hirohito Maeda, Takaaki Yodo
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Publication number: 20090246678Abstract: It is an object of the present invention to provide a liquid developer in which in liquid developers for electrophotography or electrostatic recording obtained using the coacervation method, electric resistance of the liquid developer and the electrophoretic property or the charging characteristic of the toner particles are adequately maintained, and the dispersibility of a pigment and the dispersion stability of the toner particles are good. A liquid developer formed by dispersing colored resin particles comprising at least a pigment, a dispersant and a resin in a hydrocarbon insulating medium using a coacervation method, wherein said dispersant is a carbodiimide compound having at least one basic nitrogen-containing group and at least one polyester side chain introduced through a reaction with a carbodiimide group in its molecule, and said resin is an acid group-containing resin and the acid value of the resin is 1 to 100.Type: ApplicationFiled: November 24, 2006Publication date: October 1, 2009Applicant: SAKATA INX CORP.Inventors: Takaaki Yodo, Katsutoshi Okamoto, Hideo Shibata, Koji Iwase
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Publication number: 20090036597Abstract: An object of the present invention is to provide a carbodiimide type compound having high dispersibility and dispersion stability of pigments, fine resin particles, and pigment-resin composite fine particles particularly in a silicone dispersion medium; a pigment dispersion composition and a pigment-resin composite fine particles-containing dispersion composition preferably usable in a wide range of fields such as inks for solvent ink jet, liquid developers, and the like by using the compound; and a liquid developer using such a pigment dispersion composition and/or pigment-resin composite fine particles-containing dispersion composition. The present invention provides a carbodiimide type compound obtained by introducing a polysiloxane chain by reaction of a functional group of a polysiloxane chain-containing compound having the functional group reactive with a carbodiimide group with a carbodiimide group of a carbodiimide compound having a carbodiimide equivalent weight of 100 to 50000.Type: ApplicationFiled: March 23, 2006Publication date: February 5, 2009Applicant: SAKATA INX CORP.Inventors: Hideo Shibata, Koji Iwase, Hirohito Maeda, Takaaki Yodo
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Publication number: 20090011359Abstract: It is an object of the present invention to provide a liquid developer in which, in liquid developers for electrophotography or electrostatic recording, the adverse effect on electric resistance of the liquid developer and the electrically charged characteristics of toner particles is minimized and the dispersibility of a pigment and the dispersion stability of the toner particles are improved. The present invention relates to a liquid developer, which is obtained by dispersing colored resin particles encapsulating a pigment in an insulating hydrocarbon organic solvent by a wet-grinding method using a dispersant, wherein the dispersant is a polyester side chain-containing carbodiimide type compound formed by introducing a polyester side chain into a molecule of a carbodiimide compound through a reaction with a carbodiimide group.Type: ApplicationFiled: April 27, 2006Publication date: January 8, 2009Applicant: SAKATA INX CORP.Inventors: Koji Iwase, Hirohito Maeda, Takaaki Yodo, Hideo Shibata
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Patent number: 7252710Abstract: A pigment dispersion composition which can be suitably applied in such fields as color filters, black matrices and ink jet recording where it is necessary to finely disperse pigments still with retention of good dispersion stability and temporal stability even when the total amount a pigment derivative, pigment intermediate, colorant derivative and colorant intermediate, and/or a pigment dispersant is small. Another object is a pigment dispersion-based resist composition which can give color filters high in permeability, excellent in contrast and causing no bleeding or black matrices high in light-shielding and insulating properties, and causing no bleeding.Type: GrantFiled: June 26, 2003Date of Patent: August 7, 2007Assignee: Sakata Inx Corp.Inventors: Masanori Kano, Kazunori Itoh, Takaaki Yodo
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Patent number: 7220306Abstract: The present invention provides a treated pigment produced by treating at least one pigment selected from the group consisting of organic pigments and carbon black each having a functional group reactive with a carbodiimide group with a carbodiimide compound having one or more carbodiimide groups, said carbodiimide compound having, within the molecule thereof, at least one side chain selected from the group consisting of polyester side chains, polyether side chains and polyacrylic side chains, with a carbodiimide equivalent of 100 to 50,000.Type: GrantFiled: March 10, 2003Date of Patent: May 22, 2007Assignee: Sakata INK Corp.Inventors: Masanori Kano, Kazunori Itoh, Naoyuki Kitaoka, Takaaki Yodo, Hideo Shibata
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Patent number: 7220307Abstract: A treated pigment and a dispersion composition thereof having preferable dispersion stability and fluidity in a dispersion medium even the pigment has no functional group reactive with a carbodiimide group on the surface thereof, and further to provide a resist composition exerting very excellent developing characteristics when forming color filters, black matrices and the like patterns. Furthermore, the invention also provides a compound for pigment treatment suited for the treatment of such pigment. A treated pigment which is producible by the treatment with a carbodiimide-based compound having at least one side chain selected from the group consisting of polyester side chains, polyether side chains and polyacrylic side chains and at least one basic nitrogen-containing group within the molecule.Type: GrantFiled: June 25, 2003Date of Patent: May 22, 2007Assignee: Sakata Inx Corp.Inventors: Masanori Kano, Kazunori Itoh, Takaaki Yodo, Naoyuki Kitaoka, Hideo Shibata
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Publication number: 20050284335Abstract: The present invention provides a pigment dispersion composition which can be suitably applied in such fields as color filters, black matrices and ink jet recording where it is necessary to disperse pigments still more finely and which can retain good dispersion stability and temporal stability even when the total amount to be used of at least one species selected from the group consisting of a pigment derivative, pigment intermediate, colorant derivative and colorant intermediate, and a pigment dispersant is small. Another object is to provide a pigment dispersion-based resist composition which can give color filters high in permeability, excellent in contrast and the like and causing no breeding or black matrices high in light-shielding and insulating properties, and causing no breeding.Type: ApplicationFiled: June 26, 2003Publication date: December 29, 2005Inventors: Masanori Kano, Kazunori Itoh, Takaaki Yodo
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Publication number: 20050256247Abstract: The present invention provides a treated pigment and a dispersion composition thereof having preferable dispersion stability and fluidity in a dispersion medium even the pigment has no functional group reactive with a carbodiimide group on the surface thereof, and further to provide a resist composition exerting very excellent developing characteristics when forming color filters, black matrices and the like patterns. Furthermore, the invention also provides a compound for pigment treatment suited for the treatment of such pigment. The present invention relates to a treated pigment which is producible by the treatment with a carbodiimide-based compound having at least one side chain selected from the group consisting of polyester side chains, polyether side chains and polyacrylic side chains and at least one basic nitrogen-containing group within the molecule.Type: ApplicationFiled: June 25, 2003Publication date: November 17, 2005Inventors: Masanori Kano, Kazunori Itoh, Takaaki Yodo, Naoyuki Kitaoka, Hideo Shibata
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Publication number: 20050204959Abstract: The present invention provides a treated pigment produced by treating at least one pigment selected from the group consisting of organic pigments and carbon black each having a functional group reactive with a carbodiimide group with a carbodiimide compound having one or more carbodiimide groups, said carbodiimide compound having, within the molecule thereof, at least one side chain selected from the group consisting of polyester side chains, polyether side chains and polyacrylic side chains, with a carbodiimide equivalent of 100 to 50,000.Type: ApplicationFiled: March 10, 2003Publication date: September 22, 2005Inventors: Masanori Kano, Kazunori Itoh, Naoyuki Kitaoka, Takaaki Yodo, Hideo Shibata