Patents by Inventor Nagayuki Takao

Nagayuki Takao 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: 7732505
    Abstract: An active energy ray-curable ink composition comprising a colorant, a monomer and a photopolymerization initiator, in which the monomer contains an acrylamide derivative in an amount of 10 to 90% by weight based on the whole weight of the ink composition, and the ink composition has a viscosity of 3 to 35 mPa·s at 25° C. The ink composition has a low viscosity without dilution by a diluent solvent, good storage stability, good pigment dispersibility when a pigment is used as a colorant and also good continuous ejection stability to a printing medium, has a good curing property at a low energy level such as a cumulative amount of light of 150 mJ/cm2 or less, and it can attain good printing quality on nonabsorbable printing medium and achieves good adhesion of printed images to the printing medium.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: June 8, 2010
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Katsuyuki Kito, Nagayuki Takao
  • Publication number: 20080234428
    Abstract: A pigmented ink composition comprising a pigment, a resin having an acidic group and an organic solvent having a boiling point of at least 150° C. which is present in an amount of from 50 to 90% by weight based on the whole weight of the ink composition. When this ink composition is subjected to an printed layer-sliding test in which the ink composition is applied on a cationically treated printing medium with a #4 bar coater (available from TOYO SEIKI KOGYO CO., LTD.) and dried and then the printed surface is slid with a cloth on which a weight of 50 g is placed, the printed record is not grazed. This ink composition contains the pigment with a small dispersion particle size and has good water resistance, can be printed on a plain paper sheet without cockling, and suffers from no grazing of printed records when the ink composition is printed on a cationically treated paper sheet.
    Type: Application
    Filed: May 27, 2008
    Publication date: September 25, 2008
    Inventors: Takahiro FURUTANI, Nagayuki TAKAO
  • Patent number: 7393884
    Abstract: A pigmented ink composition comprising a pigment, a resin having an acidic group and an organic solvent having a boiling point of at least 150° C. which is present in an amount of from 50 to 90% by weight based on the whole weight of the ink composition. When this ink composition is subjected to an printed layer-sliding test in which the ink composition is applied on a cationically treated printing medium with a #4 bar coater (available from TOYO SEIKI KOGYO CO., LTD.) and dried and then the printed surface is slid with a cloth on which a weight of 50 g is placed, the printed record is not grazed. This ink composition contains the pigment with a small dispersion particle size and has good water resistance, can be printed on a plain paper sheet without cockling, and suffers from no grazing of printed records when the ink composition is printed on a cationically treated paper sheet.
    Type: Grant
    Filed: June 20, 2003
    Date of Patent: July 1, 2008
    Assignee: Hitachi Maxwell, Ltd.
    Inventors: Takahiro Furutani, Nagayuki Takao
  • Publication number: 20080076846
    Abstract: An active energy ray-curable ink composition comprising a colorant, a monomer and a photopolymerization initiator, in which the monomer contains an acrylamide derivative in an amount of 10 to 90% by weight based on the whole weight of the ink composition, and the ink composition has a viscosity of 3 to 35 mPa·s at 25° C. The ink composition has a low viscosity without dilution by a diluent solvent, good storage stability, good pigment dispersibility when a pigment is used as a colorant and also good continuous ejection stability to a printing medium, has a good curing property at a low energy level such as a cumulative amount of light of 150 mJ/cm2 or less, and it can attain good printing quality on nonabsorbable printing medium and achieves good adhesion of printed images to the printing medium.
    Type: Application
    Filed: October 6, 2005
    Publication date: March 27, 2008
    Inventors: Katsuyuki Kito, Nagayuki Takao
  • Publication number: 20060205844
    Abstract: An aqueous dispersion containing a water-insoluble solid, wherein the solid consists of fine particles surfaces of which are coated with a resin having a polyether structure, and a coated amount of the resin is 15 to 1,000 parts by weight per 100 parts of the solid. This aqueous dispersion has improved dispersion stability for various solids such as pigments, dyes, and so on, causes no problems such as precipitation of the solid particles during the storage of the dispersion, and thus can be stably stored for a long time. The present invention can provide an aqueous dispersion used as an ink-jet printing ink, which has good high speed printing properties besides the above properties.
    Type: Application
    Filed: April 30, 2003
    Publication date: September 14, 2006
    Inventors: Takuo Mizutani, Takahiro Furutani, Nagayuki Takao
  • Patent number: 7029110
    Abstract: A dispersion composition including a colorant and an acrylic polymer having the furan structure, and an ink for an ink jet printer including such a dispersion composition. This dispersion composition can achieve the satisfactory stability of the colorant irrespective of the kind of the colorant, and allows the inks to be formulated to have the same composition. The ink for an ink jet printer has good storage stability and printing stability.
    Type: Grant
    Filed: January 11, 2002
    Date of Patent: April 18, 2006
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Nagayuki Takao, Sachie Kawazu, Kazuki Sakai
  • Publication number: 20050203209
    Abstract: A pigmented ink composition comprising a pigment, a resin having an acidic group and an organic solvent having a boiling point of at least 150° C. which is present in an amount of from 50 to 90% by weight based on the whole weight of the ink composition. When this ink composition is subjected to an printed layer-sliding test in which the ink composition is applied on a cationically treated printing medium with a #4 bar coater (available from TOYO SEIKI KOGYO CO., LTD.) and dried and then the printed surface is slid with a cloth on which a weight of 50 g is placed, the printed record is not grazed. This ink composition contains the pigment with a small dispersion particle size and has good water resistance, can be printed on a plain paper sheet without cockling, and suffers from no grazing of printed records when the ink composition is printed on a cationically treated paper sheet.
    Type: Application
    Filed: June 20, 2003
    Publication date: September 15, 2005
    Inventors: Takahiro Furutani, Nagayuki Takao
  • Patent number: 6936657
    Abstract: There is provided a dispersion composition which has excellent dispersion stability and hardly sediments even after a long-term storage. This dispersion composition is a composition comprising a particulate material dispersed in an organic solvent, wherein a graft copolymer which has a particle diameter of 0.01-1 ?m and self-disperses in said organic solvent is adsorbed to at least a part of the outer surface of said particulate material and a graft chain of said graft copolymer comprises a polysiloxane and an alkylene group of 1-18 carbon atoms.
    Type: Grant
    Filed: June 9, 2003
    Date of Patent: August 30, 2005
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Nagayuki Takao, Miyuki Nishimura
  • Patent number: 6900253
    Abstract: The object of the present invention is to provide an ink for ink jet printers which is improved in dispersion stability. The ink is one containing a pigment and an organic solvent where a silicone graft polymer is contained in the ink and is dispersed in the organic solvent in the form of particles having a particle diameter of 0.01-0.3 ?m in such a state as the silicone graft polymer being adsorbed to at least a part of the outer surface of the pigment. The pigment is an organic pigment and/or carbon black.
    Type: Grant
    Filed: March 29, 2001
    Date of Patent: May 31, 2005
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Nagayuki Takao, Miyuki Nishimura
  • Publication number: 20040116552
    Abstract: A dispersion composition comprising a colorant and an acrylic polymer having the furan structure, and an ink for an ink jet printer comprising such a dispersion composition. This dispersion composition can achieve the satisfactory stability of the colorant irrespective of the kind of the colorant, and allows the inks to be formulated to have the same composition. The ink for an ink jet printer has good storage stability and printing stability.
    Type: Application
    Filed: July 11, 2003
    Publication date: June 17, 2004
    Inventors: Nagayuki Takao, Sachie Kawazu, Kazuki Sakai
  • Publication number: 20030212198
    Abstract: There is provided a dispersion composition which has excellent dispersion stability and hardly sediments even after a long-term storage. This dispersion composition is a composition comprising a particulate material dispersed in an organic solvent, wherein a graft copolymer which has a particle diameter of 0.01-1 &mgr;m and self-disperses in said organic solvent is adsorbed to at least a part of the outer surface of said particulate material and a graft chain of said graft copolymer comprises a polysiloxane and an alkylene group of 1-18 carbon atoms.
    Type: Application
    Filed: June 9, 2003
    Publication date: November 13, 2003
    Applicant: Hitachi Maxell, Ltd.
    Inventors: Nagayuki Takao, Miyuki Nishimura
  • Patent number: 6627696
    Abstract: There is provided a dispersion composition which has excellent dispersion stability and hardly sediments even after a long-term storage. This dispersion composition is a composition comprising a particulate material dispersed in an organic solvent, wherein a graft copolymer which has a particle diameter of 0.01-1 &mgr;m and self-disperses in said organic solvent is adsorbed to at least a part of the outer surface of said particulate material and a graft chain of said graft copolymer comprises a polysiloxane and an alkylene group of 1-18 carbon atoms.
    Type: Grant
    Filed: September 28, 2000
    Date of Patent: September 30, 2003
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Nagayuki Takao, Miyuki Nishimura
  • Publication number: 20020077383
    Abstract: The object of the present invention is to provide an ink for ink jet printers which is improved in dispersion stability. The ink is one containing a pigment and an organic solvent where a silicone graft polymer is contained in the ink and is dispersed in the organic solvent in the form of particles having a particle diameter of 0.01-0.3 &mgr;m in such a state as the silicone graft polymer being adsorbed to at least a part of the outer surface of the pigment. The pigment is an organic pigment and/or carbon black.
    Type: Application
    Filed: March 29, 2001
    Publication date: June 20, 2002
    Inventors: Nagayuki Takao, Miyuki Nishimura
  • Patent number: 6395805
    Abstract: An object of the present invention is to provide a dispersion composition which is free from the precipitation problem because of its improved dispersion stability, permits employment of various kinds of organic solvents and insoluble granular materials, is widely utilizable, and is useful as, in particular, a liquid developer or a jet printing ink, in which electrostatic force is utilized. The present invention provides a dispersion composition comprising a dispersion of a granular material in an organic solvent and further comprising a high-molecular weight compound having acidic groups and a high-molecular weight compound having basic groups, at least a part of said high-molecular compounds being insoluble in the organic solvent, and said high-molecular weight compounds being adsorbed on at least a portion of the granular material.
    Type: Grant
    Filed: May 19, 2000
    Date of Patent: May 28, 2002
    Assignee: Hitachi Maxell, Ltd.
    Inventor: Nagayuki Takao
  • Publication number: 20020045679
    Abstract: The object of the present invention is to provide an aqueous ink composition which shows excellent drying characteristics for impermeable printing materials such as plastic films without using apparatuses such as ultraviolet irradiation apparatuses and heating apparatuses and which is mild for earth environment. The aqueous ink composition of the present invention contains water, a water-soluble solvent, a water-soluble resin and a dye, and, additionally, a quick-drying property imparting agent having a solubility in the water lower than that in the water-soluble solvent.
    Type: Application
    Filed: August 9, 2001
    Publication date: April 18, 2002
    Inventors: Nagayuki Takao, Takahiro Furutani
  • Patent number: 5788759
    Abstract: A .delta.-indanthrone blue pigment having an average primary particle diameter in the range of 0.5 .mu.m or less and having a chroma C* value of 20 or greater; a hue angle in the range of 274-283 when colorimetry is performed on a paint film made from a melamine alkyd paint in which the proportion of pigment in the solid portion is 9.6%; and containing .delta.-indanthrone blue pigment and titanium dioxide pigment in a ratio of 1 to 20 by weight.
    Type: Grant
    Filed: April 12, 1996
    Date of Patent: August 4, 1998
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Nagayuki Takao, Isao Oshiumi, Kiyomi Kitami