Patents by Inventor Yasuaki Murai

Yasuaki Murai 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: 10216107
    Abstract: Provided is a toner having a toner particle that contains a binder resin and a wax, wherein the solubility parameter SP of the binder resin is at least 9.4 and not more than 10.0; the binder resin contains a resin having a structure represented by the following formula (1) in the terminal position on a main chain of the resin, *—CO—R??formula (1) (in formula (1), R represents a phenyl group or a derivative thereof, or —COOR1, R1 represents an alkyl group having 1 to 4 carbons, and * represents a bond to the main chain of the resin); the solubility parameter SW of the wax is at least 8.1 and not more than 9.0; and SP and SW satisfy formula (2), |SP?SW|>0.5??formula (2).
    Type: Grant
    Filed: December 28, 2017
    Date of Patent: February 26, 2019
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Keiichiro Tsubaki, Naoya Isono, Yasuaki Murai, Masao Suzuki
  • Patent number: 10087328
    Abstract: A compound that improves the dispersibility of pigments in non-water-soluble solvents is provided, the compound having a pigment dispersant, a pigment composition, a pigment dispersion, and a toner wherein the compound has a polymer and a monoazo compound having a certain structure binding to each other.
    Type: Grant
    Filed: August 28, 2014
    Date of Patent: October 2, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuaki Murai, Yuki Tsujii, Waka Hasegawa, Ayano Mashida, Kosuke Mukumoto, Takayuki Toyoda, Masashi Kawamura, Chiaki Nishiura, Masanori Seki, Masashi Hirose
  • Publication number: 20180196367
    Abstract: Provided is a toner having a toner particle that contains a binder resin and a wax, wherein the solubility parameter SP of the binder resin is at least 9.4 and not more than 10.0; the binder resin contains a resin having a structure represented by the following formula (1) in the terminal position on a main chain of the resin, *—CO—R??formula (1) (in formula (1), R represents a phenyl group or a derivative thereof, or —COOR1, R1 represents an alkyl group having 1 to 4 carbons, and * represents a bond to the main chain of the resin); the solubility parameter SW of the wax is at least 8.1 and not more than 9.0; and SP and SW satisfy formula (2), |SP?SW|>0.5??formula (2).
    Type: Application
    Filed: December 28, 2017
    Publication date: July 12, 2018
    Inventors: Keiichiro Tsubaki, Naoya Isono, Yasuaki Murai, Masao Suzuki
  • Patent number: 9926450
    Abstract: The present invention provides a compound capable of improving the dispersibility of color pigments in a water-insoluble solvent; and a pigment-dispersing agent. The present invention also provides a pigment composition, a pigment dispersion, and a toner, which have satisfactory tinting strength. The present invention provides the compound containing a polymer having a monomer unit having a specific chemical structure, the compound having a moiety also having a specific structure.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: March 27, 2018
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Masashi Kawamura, Yasuaki Murai, Kosuke Mukumoto, Yuki Tsujii, Ayano Mashida, Waka Hasegawa, Masanori Seki, Takayuki Toyoda, Chiaki Nishiura, Masashi Hirose
  • Patent number: 9834683
    Abstract: The present invention provides a compound and a pigment dispersant, each of which improves the dispersibility of various types of pigments in a non-aqueous solvent and also provides a pigment composition, a pigment dispersion, and a toner, each of which has a preferable coloring power. The compound includes a polymer which has a monomer unit having a specific structure and also includes a specific partial structure.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: December 5, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Chiaki Nishiura, Yuki Tsujii, Yasuaki Murai, Takayuki Toyoda, Waka Hasegawa, Masanori Seki, Masashi Kawamura, Masashi Hirose, Ayano Mashida
  • Patent number: 9829814
    Abstract: A toner having a toner particle that contains a binder resin, a pigment, a pigment dispersant, and a crystalline polyester, wherein the pigment dispersant has a specific pigment adsorption segment and a polymer moiety and a hydrophobic parameter HP1 for the pigment dispersant and a hydrophobic parameter HP2 for the crystalline polyester satisfy the formula ?0.28?(HP1?HP2)?0.15.
    Type: Grant
    Filed: February 17, 2016
    Date of Patent: November 28, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Masashi Kawamura, Yasuaki Murai, Takayuki Toyoda
  • Patent number: 9777087
    Abstract: A polymer including a unit having a phthalocyanine structure, the polymer having a high capability of dispersing pigments. A pigment composition, a pigment dispersion, and a toner all having a high tinting strength.
    Type: Grant
    Filed: February 25, 2016
    Date of Patent: October 3, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Yasuaki Murai, Osamu Matsushita, Takayuki Toyoda, Waka Hasegawa, Ayano Mashida, Kosuke Mukumoto, Masashi Hirose
  • Patent number: 9715187
    Abstract: Provided are a method of producing a compound having a colorant structure suitable for a pigment dispersant, and a pigment dispersant, a pigment composition, a pigment dispersion, and a toner each containing the compound. The production method is a method of producing a compound in which a polymer portion and a colorant portion are bonded to each other through a linking group, the method including the steps of: (a) polymerizing a vinyl-based polymerizable monomer represented by the formula (A) with a radical initiator having a protective group by living radical polymerization to provide a polymer having the protective group at a terminal thereof; (b) hydrolyzing the protective group of the polymer having the protective group at a terminal thereof obtained by the step (a) to deprotect the polymer; and (c) bonding the deprotected polymer obtained by the step (b) and a colorant to each other through a covalent bond.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: July 25, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Kosuke Mukumoto, Yasuaki Murai, Yuki Hasegawa, Takayuki Toyoda, Ayano Mashida, Waka Hasegawa, Chiaki Nishiura, Masanori Seki, Masashi Hirose
  • Patent number: 9625845
    Abstract: The present invention provides a compound capable of improving the dispersibility of yellow, magenta, cyan, and black pigments in a water-insoluble solvent and a pigment-dispersing agent. The present invention also provides a pigment composition, a pigment dispersion, and a toner, which have satisfactory tinting strength. The present invention relates to a compound having a structure in which an azo skeleton structure is bound to a polymer portion via a linking group in the azo skeleton structure.
    Type: Grant
    Filed: April 24, 2014
    Date of Patent: April 18, 2017
    Assignee: Canon Kabushiki Kaisha
    Inventors: Ayano Mashida, Yasuaki Murai, Waka Hasegawa, Masanori Seki, Takayuki Toyoda, Masashi Kawamura, Chiaki Nishiura, Yuki Tsujii, Taiki Watanabe, Masashi Hirose
  • Patent number: 9618867
    Abstract: A pigment dispersion containing a pigment, a non-water-soluble solvent, a compound in which an specific azo skeleton structure is bonded to a specific polymer having a monomer unit given, and a polymer compound having a monomer unit that contains a structure selected from the partial structures given by the specific formulas (3) and (4).
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: April 11, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Takayuki Toyoda, Yasuaki Murai, Waka Hasegawa, Masanori Seki, Chiaki Nishiura, Yuki Tsujii, Ayano Mashida, Masashi Hirose
  • Patent number: 9593243
    Abstract: Provided is a compound that improves dispersibility of a pigment in a non-water-soluble solvent, and a pigment dispersing agent, a pigment composition, a pigment dispersion and a toner that use that compound. The present invention relates to a compound in which a polymer and a monoazo compound having a specific structure are bonded. The present invention further relates to a pigment dispersing agent, a pigment composition, a pigment dispersion and a toner containing that compound.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: March 14, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Yuki Tsujii, Yasuaki Murai, Takayuki Toyoda, Waka Hasegawa, Masanori Seki, Chiaki Nishiura, Masashi Kawamura, Masashi Hirose, Ayano Mashida
  • Patent number: 9556290
    Abstract: To provide a method for producing a compound that enhances dispersibility of a pigment of respective colors in a water-insoluble solvent, as well as a pigment dispersant, and a pigment composition, a pigment dispersion and a toner having a good tinting power. A method for producing a compound, including the following: (i): subjecting a polymerizable monomer forming a monomer unit represented by formula (1) to radical polymerization in the presence of a radical polymerization initiator and an iodine molecule to provide a polymer; and (ii): binding a colorant to a terminal of a main chain of the polymer: wherein R1 represents a hydrogen atom and an alkyl group, and R2 represents a phenyl group, a carboxyl group, an alkoxycarbonyl group or a carboxamide group.
    Type: Grant
    Filed: March 30, 2015
    Date of Patent: January 31, 2017
    Assignee: CANON KABUSHIKI KAISHA
    Inventors: Chiaki Nishiura, Yuki Hasegawa, Ayano Mashida, Takayuki Toyoda, Masashi Hirose, Waka Hasegawa, Masanori Seki, Yasuaki Murai, Kosuke Mukumoto
  • Patent number: 9505723
    Abstract: The present invention provides a dispersant excellent in the solubility to a solvent, the adsorption power to a coloring material, and the coloring material dispersibility, and reduced in the self-coloring property, a compound and a polymerizable compound for preparing the dispersant, and a toner using the dispersant. The dispersant has a structure in which a structure represented by the following specific formula (3) or a tautomer thereof is bonded with a polymer, and the toner contains the dispersant.
    Type: Grant
    Filed: January 5, 2016
    Date of Patent: November 29, 2016
    Assignees: CANON KABUSHIKI KAISHA, CANON FINETECH INC.
    Inventors: Haruko Kubo, Suzuka Ueno, Junko Chizuwa, Tomoya Yamamoto, Hitoshi Itabashi, Yuhei Terui, Yu Yoshida, Yasuaki Murai, Takayuki Toyoda
  • Patent number: 9470995
    Abstract: To provide an azo compound which improves the dispersibility of an azo pigment in a non-water soluble solvent. The purpose is achieved by an azo compound having a specific structure in which a high molecular weight polymer unit is bonded.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: October 18, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masanori Seki, Yuki Hasegawa, Waka Hasegawa, Masashi Kawamura, Taiki Watanabe, Chiaki Nishiura, Takayuki Toyoda, Ayano Mashida, Yasuaki Murai, Masashi Hirose
  • Publication number: 20160280925
    Abstract: The present invention provides a compound capable of improving the dispersibility of color pigments in a water-insoluble solvent; and a pigment-dispersing agent. The present invention also provides a pigment composition, a pigment dispersion, and a toner, which have satisfactory tinting strength. The present invention provides the compound containing a polymer having a monomer unit having a specific chemical structure, the compound having a moiety also having a specific structure.
    Type: Application
    Filed: August 27, 2014
    Publication date: September 29, 2016
    Inventors: Masashi Kawamura, Yasuaki Murai, Kosuke Mukumoto, Yuki Tsujii, Ayano Mashida, Waka Hasegawa, Masanori Seki, Takayuki Toyoda, Chiaki Nishiura, Masashi Hirose
  • Publication number: 20160251465
    Abstract: A polymer including a unit having a phthalocyanine structure, the polymer having a high capability of dispersing pigments. A pigment composition, a pigment dispersion, and a toner all having a high tinting strength.
    Type: Application
    Filed: February 25, 2016
    Publication date: September 1, 2016
    Inventors: Yasuaki Murai, Osamu Matsushita, Takayuki Toyoda, Waka Hasegawa, Ayano Mashida, Kosuke Mukumoto, Masashi Hirose
  • Publication number: 20160246200
    Abstract: A pigment dispersion containing a pigment, a non-water-soluble solvent, a compound in which an specific azo skeleton structure is bonded to a specific polymer having a monomer unit given, and a polymer compound having a monomer unit that contains a structure selected from the partial structures given by the specific formulas (3) and (4).
    Type: Application
    Filed: February 16, 2016
    Publication date: August 25, 2016
    Inventors: Takayuki Toyoda, Yasuaki Murai, Waka Hasegawa, Masanori Seki, Chiaki Nishiura, Yuki Tsujii, Ayano Mashida, Masashi Hirose
  • Publication number: 20160246192
    Abstract: A toner having a toner particle that contains a binder resin, a pigment, a pigment dispersant, and a crystalline polyester, wherein the pigment dispersant has a specific pigment adsorption segment and a polymer moiety and a hydrophobic parameter HP1 for the pigment dispersant and a hydrophobic parameter HP2 for the crystalline polyester satisfy the formula ?0.28?(HP1?HP2)?0.15.
    Type: Application
    Filed: February 17, 2016
    Publication date: August 25, 2016
    Inventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Masashi Kawamura, Yasuaki Murai, Takayuki Toyoda
  • Patent number: 9410038
    Abstract: There are provided a new compound which has the following general formula (1) and which is useful as a coloring material, an ink containing the compound, an ink cartridge containing the ink and an ink jet recording method including ejecting the ink from a recording head of an ink jet system to record an image on a recording medium.
    Type: Grant
    Filed: March 19, 2014
    Date of Patent: August 9, 2016
    Assignee: Canon Kabushiki Kaisha
    Inventors: Masahiro Suenaga, Kaoru Takahashi, Yasuaki Murai, Takeshi Miyazaki, Yutaka Tani, Masashi Hirose, Ryosuke Nagao, Yoshio Kinoshita, Yoshihide Aikawa
  • Publication number: 20160208105
    Abstract: The present invention provides a compound and a pigment dispersant, each of which improves the dispersibility of various types of pigments in a non-aqueous solvent and also provides a pigment composition, a pigment dispersion, and a toner, each of which has a preferable coloring power. The compound includes a polymer which has a monomer unit having a specific structure and also includes a specific partial structure.
    Type: Application
    Filed: August 27, 2014
    Publication date: July 21, 2016
    Inventors: Chiaki Nishiura, Yuki Tsujii, Yasuaki Murai, Takayuki Toyoda, Waka Hasegawa, Masanori Seki, Masashi Kawamura, Masashi Hirose, Ayano Mashida