Patents by Inventor Yuzo Tokunaga
Yuzo Tokunaga 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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Patent number: 11624987Abstract: A liquid developer comprising: a toner particle containing binder resin; a carrier liquid; and a basic toner particle dispersing agent, wherein the basic toner particle dispersing agent is a primary amine, an acid value of the binder resin is at least 10 mg KOH/g, an acid value of a component having a molecular weight of not more than 2,000 contained in the binder resin is not more than 5 mg KOH/g, and a hydroxyl value of the component having a molecular weight of not more than 2,000 contained in the binder resin is not more than 10 mg KOH/g.Type: GrantFiled: September 14, 2020Date of Patent: April 11, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Yuzo Tokunaga, Takashi Hirasa, Yasutaka Akashi, Masato Nakajima, Naohiko Tsuchida, Akifumi Matsubara, Kohji Takenaka, Yuya Chimoto, Kouichirou Ochi, Tomoyo Miyakai
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Publication number: 20220269189Abstract: A magnetic carrier comprises a magnetic carrier core and a coating resin layer coating a surface of the magnetic carrier core. The coating resin layer contains resin A and resin B at contents of 1% to 50% by mass and 50% to 90% by mass, respectively, based on resin components of the coating resin layer. The resin A has a first partial structure and a second partial structure, while the resin B has a third partial structure and a fourth partial structure. The mass X of the resin A, the total mass Ma of the first partial structure, and the total mass Mb of the second partial structure satisfy 0.50?(Ma+Mb)/X?1.00 and 0.10?a/b?30.0, and the SP value of the first partial structure SPa1 and the SP value of the third partial structure SPb3 satisfy 0?|SPa1—SPb3|?10.0.Type: ApplicationFiled: February 7, 2022Publication date: August 25, 2022Inventors: Yuu Nishimura, Yuzo Tokunaga, Nobuyoshi Sugahara, Hironori Minagawa, Nobuhiro Yoshida
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Publication number: 20220236659Abstract: A magnetic carrier, which is suppressed from causing the loss and wear of a magnetic carrier coating resin even when used for a long time period, and achieves a stable image density and a reduction in toner scattering. In the magnetic carrier, the resin coating layer contains a resin A having a fluorine polymer moiety, the resin coating layer has an average thickness of 50 nm or more, a ratio F(x) (atomic %) of a fluorine atom detected at a position at a depth of x nm from a surface of a magnetic carrier particle by X-ray photoelectron spectroscopy satisfies formula (1) and formula (2), and when x represents an integer of 0 or more and 20 or less, F(x) satisfies formula (3): 5.0?F(0)?15??(1) F(20)?5.0??(2) |F(x+1)?F(x)|?7.5??(3).Type: ApplicationFiled: January 21, 2022Publication date: July 28, 2022Inventors: Nobuhiro Yoshida, Hironori Minagawa, Yuzo Tokunaga, Nobuyoshi Sugahara, Yuu Nishimura
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Patent number: 11281120Abstract: A binder resin of toner particles in a liquid developer contains a resin having a monomer unit derived from at least one polymerizable monomer selected from the group consisting of (meth)acrylates with an alkyl group having 18 to 36 carbon atoms, and the binder resin has an SP value higher by 1.5 (J/cm3)0.5 or more than the SP value of a carrier liquid.Type: GrantFiled: May 27, 2020Date of Patent: March 22, 2022Assignee: Canon Kabushiki KaishaInventors: Yuzo Tokunaga, Tomoyo Miyakai, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Patent number: 11188005Abstract: A liquid developer containing toner particles and a carrier liquid, the toner particles containing a resin component, wherein the resin component includes a resin A and a resin B, the resin A has a unit Y1 represented by the formula (1) and a unit Y2 represented by the formula (2), the resin B has a unit Y3 represented by the formula (3) and a unit Y4 selected from the units represented by the formulae (4) to (8), the resin A has a unit Y2 content of 1% to 20% by mass, the resin B has a unit Y3 content of 5% to 90% by mass, the resin component has a resin A content of 50% to 99% by mass, and the resin component has a resin B content of 1% to 50% by mass.Type: GrantFiled: September 10, 2020Date of Patent: November 30, 2021Assignee: Canon Kabushiki KaishaInventors: Tomoyo Miyakai, Yuzo Tokunaga, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Patent number: 11181848Abstract: A liquid developer containing a liquid carrier and a toner particle that is insoluble in the liquid carrier, wherein a particular substructure is bonded through a covalent bond to a surface of the toner particle, and a method of producing a liquid developer containing a liquid carrier and a toner particle that is insoluble in the liquid carrier, the method comprising a step (I) of covalently bonding, to a surface of the toner particle, a compound having a particular substructure.Type: GrantFiled: February 19, 2020Date of Patent: November 23, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Kouichirou Ochi, Yuzo Tokunaga, Tomoyo Miyakai, Akifumi Matsubara, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Publication number: 20210096477Abstract: A liquid developer containing toner particles and a carrier liquid, the toner particles containing a resin component, wherein the resin component includes a resin A and a resin B, the resin A has a unit Y1 represented by the formula (1) and a unit Y2 represented by the formula (2), the resin B has a unit Y3 represented by the formula (3) and a unit Y4 selected from the units represented by the formulae (4) to (8), the resin A has a unit Y2 content of 1% to 20% by mass, the resin B has a unit Y3 content of 5% to 90% by mass, the resin component has a resin A content of 50% to 99% by mass, and the resin component has a resin B content of 1% to 50% by mass.Type: ApplicationFiled: September 10, 2020Publication date: April 1, 2021Inventors: Tomoyo Miyakai, Yuzo Tokunaga, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Publication number: 20210080848Abstract: A liquid developer containing: a toner containing a binder resin; a carrier liquid; and a basic toner dispersing agent, wherein the binder resin contains a polylactic acid, the polylactic acid has an acid value of at least 5 mg KOH/g, and a content of the polylactic acid in the binder resin is at least 50 mass %.Type: ApplicationFiled: September 4, 2020Publication date: March 18, 2021Inventors: Naohiko Tsuchida, Takashi Hirasa, Yasutaka Akashi, Masato Nakajima, Yuzo Tokunaga, Kohji Takenaka, Akifumi Matsubara, Yuya Chimoto, Kouichirou Ochi, Tomoyo Miyakai
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Publication number: 20210063906Abstract: A liquid developer that can show excellent adhesiveness with respect to plastic film media even if a base layer is not formed, the liquid developer includes a toner particle and a carrier liquid, where the toner particle contains a resin including a monomer unit (1) represented by the formula (1).Type: ApplicationFiled: August 18, 2020Publication date: March 4, 2021Inventors: Yuzo Tokunaga, Tomoyo Miyakai, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Publication number: 20210033995Abstract: A liquid developer contains toner particles containing a binder resin and a colorant, a liquid carrier, a toner-particle dispersant, and a compound represented by formula (1). The liquid carrier contains at least one selected from the group consisting of liquid aliphatic hydrocarbons and liquid polysiloxanes. The toner-particle dispersant is an amine-based dispersant.Type: ApplicationFiled: July 22, 2020Publication date: February 4, 2021Inventors: Yuzo Tokunaga, Tomoyo Miyakai, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Publication number: 20200409284Abstract: A liquid developer comprising a toner particle, a carrier liquid, and a basic toner particle dispersing agent, wherein the toner particle contains a polyester resin A, and the polyester resin A contains at least one monomer unit selected from the group consisting of monomer units derived from aliphatic monocarboxylic acids having from 1 to 6 carbons and monomer units derived from aromatic monocarboxylic acids having from 7 to 12 carbons.Type: ApplicationFiled: September 14, 2020Publication date: December 31, 2020Inventors: Akifumi Matsubara, Naohiko Tsuchida, Kohji Takenaka, Tomoyo Miyakai, Kouichirou Ochi, Yuya Chimoto, Masato Nakajima, Yasutaka Akashi, Takashi Hirasa, Yuzo Tokunaga
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Publication number: 20200409285Abstract: A liquid developer comprising: a toner particle containing binder resin; a carrier liquid; and a basic toner particle dispersing agent, wherein the basic toner particle dispersing agent is a primary amine, an acid value of the binder resin is at least 10 mg KOH/g, an acid value of a component having a molecular weight of not more than 2,000 contained in the binder resin is not more than 5 mg KOH/g, and a hydroxyl value of the component having a molecular weight of not more than 2,000 contained in the binder resin is not more than 10 mg KOH/g.Type: ApplicationFiled: September 14, 2020Publication date: December 31, 2020Inventors: Yuzo Tokunaga, Takashi Hirasa, Yasutaka Akashi, Masato Nakajima, Naohiko Tsuchida, Akifumi Matsubara, Kohji Takenaka, Yuya Chimoto, Kouichirou Ochi, Tomoyo Miyakai
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Publication number: 20200379366Abstract: A binder resin of toner particles in a liquid developer contains a resin having a monomer unit derived from at least one polymerizable monomer selected from the group consisting of (meth)acrylates with an alkyl group having 18 to 36 carbon atoms, and the binder resin has an SP value higher by 1.5 (J/cm3)0.5 or more than the SP value of a carrier liquid.Type: ApplicationFiled: May 27, 2020Publication date: December 3, 2020Inventors: Yuzo Tokunaga, Tomoyo Miyakai, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Publication number: 20200272068Abstract: A liquid developer containing a liquid carrier and a toner particle that is insoluble in the liquid carrier, wherein a particular substructure is bonded through a covalent bond to a surface of the toner particle, and a method of producing a liquid developer containing a liquid carrier and a toner particle that is insoluble in the liquid carrier, the method comprising a step (I) of covalently bonding, to a surface of the toner particle, a compound having a particular substructure.Type: ApplicationFiled: February 19, 2020Publication date: August 27, 2020Inventors: Kouichirou Ochi, Yuzo Tokunaga, Tomoyo Miyakai, Akifumi Matsubara, Takashi Hirasa, Hayato Ida, Yasutaka Akashi
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Publication number: 20190107794Abstract: The liquid developer according to the present invention includes a toner particle containing a polyester resin and a pigment and includes a carrier liquid comprising a nonaqueous solution, the polyester resin contains a monomer unit derived from trimellitic acid, and the content of the monomer unit derived from trimellitic acid in the total acid component-derived monomer unit constituting the polyester resin is from 2.0 mol % to 60.0 mol %, the polyester resin also contains a monomer unit derived from an ethylene oxide adduct on bisphenol A, and the content of the monomer unit derived from the ethylene oxide adduct on bisphenol A in the total alcohol component-derived monomer unit constituting the polyester resin is from 50.0 mol % to 100.0 mol %, and the average circularity of the toner particle is at least 0.950.Type: ApplicationFiled: December 11, 2018Publication date: April 11, 2019Inventors: Yuzo Tokunaga, Yasutaka Akashi, Naohiko Tsuchida, Junji Ito, Yasuhiro Aichi, Jun Shirakawa, Ryo Natori, Waka Hasegawa, Ayano Mashida
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Patent number: 10162281Abstract: A liquid developer comprising a toner particle containing a binder resin and a carbon black, a toner particle dispersing agent, and a carrier liquid, wherein amounts of group 15 elements, group 16 elements, and group 17 elements on a surface of the carbon black are respectively 0.1 atomic percent or less with respect to a total amount of elements on the carbon black surface.Type: GrantFiled: June 21, 2017Date of Patent: December 25, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Naohiko Tsuchida, Yasutaka Akashi, Yuzo Tokunaga
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Publication number: 20180348658Abstract: A curable liquid developer containing: a toner particle containing a pigment and a binder resin; a toner particle dispersing agent; and a cationically polymerizable liquid monomer, wherein the binder resin contains a polyester resin having an acid value of at least 5 mg KOH/g; the polyester resin contains an alcohol component-derived monomer unit and an acid component-derived monomer unit; the alcohol component-derived monomer unit and the acid component-derived monomer unit contain specific monomer units in specific proportions; and the content of the polyester resin in the binder resin is at least 50 mass % and not more than 100 mass %.Type: ApplicationFiled: May 24, 2018Publication date: December 6, 2018Inventors: Naohiko Tsuchida, Takashi Hirasa, Yasutaka Akashi, Yuzo Tokunaga, Akifumi Matsubara, Ryo Natori, Waka Hasegawa, Ayano Mashida, Junji Ito, Yasuhiro Aichi, Jun Shirakawa
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Publication number: 20180329333Abstract: A curable liquid developer including: a toner particle containing a binder resin and a pigment; a toner particle dispersing agent; and a cationically polymerizable liquid monomer that does not dissolve the binder resin, wherein the pigment contains a copper phthalocyanine derivative represented by formula (1) below; in formula (1), each of R1, R2, R3 and R4 individually represents a hydrogen atom or a substituent derived from an amine compound, and at least one of R1, R2, R3 and R4 represents a substituent derived from an amine compound.Type: ApplicationFiled: May 2, 2018Publication date: November 15, 2018Inventors: Yuzo Tokunaga, Naohiko Tsuchida, Akifumi Matsubara, Yasutaka Akashi, Junji Ito, Yasuhiro Aichi
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Publication number: 20180321607Abstract: A curable liquid developer containing a radical-polymerizable liquid monomer, a photopolymerization initiator, a toner particle being insoluble in the radical-polymerizable liquid monomer, and an amine compound, wherein the amine compound contains an amino group and at least one group selected from the group consisting of an alkyl group having at least 6 carbon atoms, a cycloalkyl group having at least 6 carbon atoms, an alkylene group having at least 6 carbon atoms and a cycloalkylene group having at least 6 carbon atoms, and an amine value of the amine compound is at least 2 mg KOH/g and not more than 200 mg KOH/g.Type: ApplicationFiled: April 26, 2018Publication date: November 8, 2018Inventors: Akifumi Matsubara, Yuzo Tokunaga, Naohiko Tsuchida, Yasutaka Akashi
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Patent number: 9946175Abstract: To provide an electrophotographic photosensitive member which satisfies abrasion resistance and electrical properties and which is difficult to cause image deletion. A surface layer of the electrophotographic photosensitive member of this invention contains a polymerized product of a hole transporting compound having a polymerizable functional group, in which the hole transporting compound is at least one compound selected from the group consisting of: a compound consisting of one or more carbon atoms, one or more hydrogen atoms, and one or more halogen atoms; and a compound consisting of one or more carbon atoms, one or more hydrogen atoms, one or more oxygen atoms, and one or more halogen atoms.Type: GrantFiled: March 23, 2015Date of Patent: April 17, 2018Assignee: Canon Kabushiki KaishaInventors: Koichi Nakata, Shinji Takagi, Yuzo Tokunaga, Masaki Nonaka, Ryoichi Tokimitsu