Patents by Inventor Keiko Ishidai

Keiko Ishidai 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: 10483471
    Abstract: Provided are an organic electroluminescent (EL) element having high luminescent efficiency, a small aging change in luminescent intensity even after the organic EL element is stored at a high temperature together with a long luminescent lifetime at a high temperature, and a method for producing the organic EL element. Further, a display and a lighting device including the organic EL element are also provided. The organic EL element contains an organic layer provided between at least a pair of a cathode and an anode. The organic layer is formed of at least one layer including a luminescent layer, and at least one layer forming the organic layer contains at least one of the compounds represented by the general formulae (A1) to (A5).
    Type: Grant
    Filed: January 6, 2017
    Date of Patent: November 19, 2019
    Assignee: Konica Minolta, Inc.
    Inventors: Keiko Ishidai, Shinya Otsu, Noboru Sekine
  • Publication number: 20170194574
    Abstract: Provided are an organic electroluminescent (EL) element having high luminescent efficiency, a small aging change in luminescent intensity even after the organic EL element is stored at a high temperature together with a long luminescent lifetime at a high temperature, and a method for producing the organic EL element. Further, a display and a lighting device including the organic EL element are also provided. The organic EL element contains an organic layer provided between at least a pair of a cathode and an anode. The organic layer is formed of at least one layer including a luminescent layer, and at least one layer forming the organic layer contains at least one of the compounds represented by the general formulae (A1) to (A5).
    Type: Application
    Filed: January 6, 2017
    Publication date: July 6, 2017
    Inventors: Keiko ISHIDAI, Shinya OTSU, Noboru SEKINE
  • Publication number: 20160285008
    Abstract: An object of the present invention is to provide an organic electroluminescent element which has a high luminous efficiency and an excellent driving voltage and exhibits excellent stability, and a display device and a lighting device that are equipped with the organic electroluminescent element. The organic electroluminescent element of the present invention is an organic electroluminescent element which includes at least an electron injection layer, an electron transport layer, and a luminous layer between a positive electrode and a negative electrode and in which the electron injection layer contains an electride, the electron transport layer contains an organic compound having a nitrogen atom, at least one of the nitrogen atoms has a lone pair of electrons that does not participate in aromaticity, and the lone pair of electrons does not coordinate a metal.
    Type: Application
    Filed: October 28, 2014
    Publication date: September 29, 2016
    Inventors: Yasushi OKUBO, Keiko ISHIDAI, Takeshi HAKII
  • Patent number: 9062225
    Abstract: Provided is a production process for a colorant which contains a silicon phthalocyanine compound making it possible to reach a targeted particle diameter even by a conventional dispersing method and which is excellent in performances such as a color reproducibility, a light fastness, an electrostatic property, a transparency and the like, and a colorant composition, a toner, an ink for ink jet recording and a color filter which are excellent in the above performances. The above production process is a production process for a colorant containing a silicon phthalocyanine compound and a copper phthalocyanine compound and is characterized by having a preparing step of reacting raw materials of a silicon compound and phthalocyanine under the presence of a copper salt or the copper phthalocyanine compound described above to prepare the silicon phthalocyanine compound described above.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 23, 2015
    Assignee: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Keiko Ishidai, Kimihiko Ookubo
  • Patent number: 8846965
    Abstract: Disclosed is a toner for electrophotography, which has good hue, good light resistance and good electrostatic charge, and is capable of providing images that are free from white spots. The toner for electrophotography exhibits a good performance. Specifically disclosed is a toner for electrophotography, which is characterized by containing at least one metal-containing compound that is represented by general formula (1). (In the formula, R1 represents an alkyl group; R2 represents a hydrogen atom, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, a sulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an acyl group, a halogen atom or a cyano group; and R3 represents a group that has 9 or more carbon atoms and an aromatic hydrocarbon structure.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: September 30, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kimihiko Ookubo, Keiko Ishidai, Issei Nakahara
  • Patent number: 8729285
    Abstract: A copper complex compound represented by Formula (1) is disclosed. in the formula, groups represented by R is a substituent, n is an integer of from 1 to 5 and the total carbon number contained in (R)n is 14 or more. A toner for electrophotography containing the compound is also disclosed.
    Type: Grant
    Filed: March 3, 2011
    Date of Patent: May 20, 2014
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Koji Daifuku, Ryohei Iwamoto, Keiko Ishidai, Kimihiko Ookubo, Kaori Ono, Issei Nakahara
  • Publication number: 20130260306
    Abstract: Provided is a production process for a colorant which contains a silicon phthalocyanine compound making it possible to reach a targeted particle diameter even by a conventional dispersing method and which is excellent in performances such as a color reproducibility, a light fastness, an electrostatic property, a transparency and the like, and a colorant composition, a toner, an ink for ink jet recording and a color filter which are excellent in the above performances. The above production process is a production process for a colorant containing a silicon phthalocyanine compound and a copper phthalocyanine compound and is characterized by having a preparing step of reacting raw materials of a silicon compound and phthalocyanine under the presence of a copper salt or the copper phthalocyanine compound described above to prepare the silicon phthalocyanine compound described above.
    Type: Application
    Filed: March 15, 2013
    Publication date: October 3, 2013
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Keiko ISHIDAI, Kimihiko OOKUBO
  • Publication number: 20130253213
    Abstract: Provided is a method for producing cyanoacetic acid in a hydrolysis reaction of a predetermined cyanoacetate in the presence of an acid catalyst. Further, are provided methods for producing a cyanoacetic acid derivative and a metal containing compound by using the produced cyanoacetic acid as a staring material. Herein, the method for producing cyanoacetic acid enables the content of a malonic acid byproduct generated in the hydrolysis reaction to be greatly lowered, allowing the produced cyanoacetic acid to be used as a starting material without any purification treatments. Those advantageous effects result in the great improvement in the purity and yields of the cyanoacetic acid derivative and the metal containing compound produced by said cyanoacetic acid. Accordingly, the above mentioned methods make it possible to produce cyanoacetic acid, the cyanoacetic acid derivative and the metal containing compound, as excellent in the productivity and economical efficiency.
    Type: Application
    Filed: March 15, 2013
    Publication date: September 26, 2013
    Applicant: Konica Minolta Business Technologies, Inc.
    Inventors: Dai IKEMIZU, Ryohei IWAMOTO, Keiko ISHIDAI, Kimihiko OOKUBO
  • Patent number: 8329368
    Abstract: An electrophotographic toner is disclosed. The toner contains a compound of Formula X-1 and a copper complex compound represented by the following Formula (1), which are defined detain in the specification.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: December 11, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Koji Daifuku, Ryohei Iwamoto, Keiko Ishidai, Kimihiko Ookubo, Kaori Ono, Issei Nakahara
  • Patent number: 8269018
    Abstract: A compound represented by Formula (X-1) is disclosed. in the formula, Rx1 and Rx2 each independently represents an alkyl group, Lx is a hydrogen atom or an alkyl group, Gx1 is an alkyl group having 2 or more carbon atoms, Gx2 is an alkyl group or an aromatic hydrocarbon group, Gx3 is a hydrogen atom, a halogen atom, a Gx4-CO—NH— group or a Gx5-N(Gx6)-CO—group, Gx5 and Gx6 each independently represents a hydrogen atom or a substituent, and Qx1, Qx2, Qx3, Qx4 and Qx5 each independently represents a hydrogen atom or a substituent. An electrophotographic toner containing the compound is also disclosed.
    Type: Grant
    Filed: July 27, 2011
    Date of Patent: September 18, 2012
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Kimihiko Ookubo, Ryohei Iwamoto, Koji Daifuku, Keiko Ishidai, Kaori Ono, Issei Nakahara
  • Publication number: 20120116110
    Abstract: Disclosed is a toner for electrophotography, which has good hue, good light resistance and good electrostatic charge, and is capable of providing images that are free from white spots. The toner for electrophotography exhibits a good performance. Specifically disclosed is a toner for electrophotography, which is characterized by containing at least one metal-containing compound that is represented by general formula (1). (In the formula, R1 represents an alkyl group; R2 represents a hydrogen atom, an alkoxycarbonyl group, an aryloxycarbonyl group, a sulfamoyl group, a sulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an acyl group, a halogen atom or a cyano group; and R3 represents a group that has 9 or more carbon atoms and an aromatic hydrocarbon structure.
    Type: Application
    Filed: June 4, 2010
    Publication date: May 10, 2012
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGOIES, INC.
    Inventors: Kimihiko Ookubo, Keiko Ishidai, Issei Nakahara
  • Publication number: 20110300481
    Abstract: A compound represented by Formula (X-1) is disclosed. in the formula, Rx1 and Rx2 each independently represents an alkyl group, Lx is a hydrogen atom or an alkyl group, Gx1 is an alkyl group having 2 or more carbon atoms, Gx2 is an alkyl group or an aromatic hydrocarbon group, Gx3 is a hydrogen atom, a halogen atom, a Gx4-CO—NH— group or a Gx5-N(Gx6)-CO—group, Gx5 and Gx6 each independently represents a hydrogen atom or a substituent, and Qx1, Qx2, Qx3, Qx4 and Qx5 each independently represents a hydrogen atom or a substituent. An electrophotographic toner containing the compound is also disclosed.
    Type: Application
    Filed: July 27, 2011
    Publication date: December 8, 2011
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Kimihiko OOKUBO, Ryohei IWAMOTO, Koji DAIFUKU, Keiko ISHIDAI, Kaori ONO, Issei NAKAHARA
  • Publication number: 20110152556
    Abstract: A copper complex compound represented by Formula (1) is disclosed. in the formula, groups represented by R is a substituent, n is an integer of from 1 to 5 and the total carbon number contained in (R)n is 14 or more. A toner for electrophotography containing the compound is also disclosed.
    Type: Application
    Filed: March 3, 2011
    Publication date: June 23, 2011
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Koji DAIFUKU, Ryohei IWAMOTO, Keiko ISHIDAI, Kimihiko OOKUBO, Kaori ONO, Issei NAKAHARA
  • Patent number: 7943279
    Abstract: A copper complex compound represented by Formula (1) is disclosed. in the formula, groups represented by R is a substituent, n is an integer of from 1 to 5 and the total carbon number contained in (R) n is 14 or more. A toner for electrophotography containing the compound is also disclosed.
    Type: Grant
    Filed: March 11, 2009
    Date of Patent: May 17, 2011
    Assignee: Konica Minolta Business Technologies, Inc.
    Inventors: Koji Daifuku, Ryohei Iwamoto, Keiko Ishidai, Kimihiko Ookubo, Kaori Ono, Issei Nakahara
  • Publication number: 20090233208
    Abstract: A copper complex compound represented by Formula (1) is disclosed. in the formula, groups represented by R is a substituent, n is an integer of from 1 to 5 and the total carbon number contained in (R) n is 14 or more. A toner for electrophotography containing the compound is also disclosed.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 17, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Koji DAIFUKU, Ryohei IWAMOTO, Keiko ISHIDAI, Kimihiko OOKUBO, Kaori ONO, Issei NAKAHARA
  • Publication number: 20090233209
    Abstract: An electrophotographic toner is disclosed. The toner contains a compound of Formula X-1 and a copper complex compound represented by the following Formula (1), which are defined detain in the specification.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 17, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Koji Daifuku, Ryohei Iwamoto, Keiko Ishidai, Kimihiko Ookubo, Kaori Ono, Issei Nakahara
  • Publication number: 20090233207
    Abstract: A compound represented by Formula (X-1) is disclosed. in the formula, Rx1, and Rx2 each independently represents an alkyl group, Lx is a hydrogen atom or an alkyl group, Gx1 is an alkyl group having 2 or more carbon atoms, Gx2 is an alkyl group or an aromatic hydrocarbon group, Gx3 is a hydrogen atom, a halogen atom, a Gx4-CO—NH— group or a Gx5-N(Gx6)-CO— group, Gx5 and Gx6 each independently represents a hydrogen atom or a substituent, and Qx1, Qx2, Qx3, Qx4 and Qx5 each independently represents a hydrogen atom or a substituent. An electrophotographic toner containing the compound is also disclosed.
    Type: Application
    Filed: March 11, 2009
    Publication date: September 17, 2009
    Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.
    Inventors: Kimihiko OOKUBO, Ryohei IWAMOTO, Koji DAIFUKU, Keiko ISHIDAI, Kaori ONO, Issei NAKAHARA
  • Publication number: 20070259282
    Abstract: An electrophotographic toner is disclosed. The toner is composed of a dye chelatable with a metal represented by the formula (1) and a copper compound represented by the formula (2) and a thermoplastic resin: In the formula, R1, R2, R3, and R4 each represents a hydrogen atom or a substituent. Z1 represents a 5 or 6-membered heterocyclic ring containing at least one nitrogen atom, which heterocyclic ring may have a substituent or form a condensed ring. Z2 represents a 5 or 6-membered heterocyclic ring which heterocyclic ring may have a substituent or form a condensed ring. Cu2+(X1)m(X2)n.W1 ??formula (2) wherein X1 and X2 are each a monodentate or didentate ligand, provided that X1 and X2 may link with each other which may be the same or different from each other; n and m are each an integer of 0 to 2; W1 is a counter ion when a counter ion is required for neutralization of charge.
    Type: Application
    Filed: May 4, 2007
    Publication date: November 8, 2007
    Inventors: Keiko Ishidai, Hidetaka Ninomiya
  • Patent number: 7270938
    Abstract: Disclosed is a photopolymerizable composition containing an addition-polymerizable ethylenically unsaturated compound, a photopolymerization initiator, a polymer binder, and a sensitizing dye represented by the following formula (A), wherein R1, R2, R3, R4, R5 and X are as defined in the specification.
    Type: Grant
    Filed: January 3, 2006
    Date of Patent: September 18, 2007
    Assignee: Konica Minolta Medical & Graphic, Inc.
    Inventor: Keiko Ishidai
  • Publication number: 20060216647
    Abstract: Disclosed is a photopolymerizable composition containing an ethylenically unsaturated monomer, a photopolymerization initiator and a sensitizing dye, wherein the photopolymerization initiator is comprised of an iron-arene compound and a tribromoacetic acid ester having a molecular weight of not less than 500, and the sensitizing dye is at least one selected from the group consisting of compounds represented by the following formulae (A1), (A2) and (A3),
    Type: Application
    Filed: March 9, 2006
    Publication date: September 28, 2006
    Applicant: KONICA MINOLTA MEDICAL & GRAPHIC, INC.
    Inventor: Keiko Ishidai