Patents by Inventor Takashi Hirasa
Takashi Hirasa 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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Patent number: 11385558Abstract: A toner has a toner particle containing a resin having an acid group, an aluminum pigment, and a fatty acid metal salt, wherein an acid value of the resin having an acid group is in a range of from 5 mg KOH/g to 25 mg KOH/g, and an amount of the resin having the acid group is 50% by mass or more; an amount of the aluminum pigment is in a range of from 10% by mass to 40% by mass; the fatty acid metal salt is represented by formula (R—COO)pM(OH)q; and an amount thereof is in a range of from 1 part by mass to 10 parts by mass based on 100 parts by mass of the aluminum pigment.Type: GrantFiled: June 16, 2020Date of Patent: July 12, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Yuya Chimoto, Kouichirou Ochi, Tomoyo Miyakai, Takashi Hirasa
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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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Patent number: 11112711Abstract: A white toner comprising a toner particle wherein the toner particle includes a binder resin and a calcium titanate particle, the binder resin has an acid value, and a content of the calcium titanate particle in the toner is in the range of from 25 mass % to 80 mass %.Type: GrantFiled: July 8, 2020Date of Patent: September 7, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Kouichirou Ochi, Yuya Chimoto, Tomoyo Miyakai, Takashi Hirasa
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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: 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: 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: 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: 20200341396Abstract: A white toner comprising a toner particle wherein the toner particle includes a binder resin and a calcium titanate particle, the binder resin has an acid value, and a content of the calcium titanate particle in the toner is in the range of from 25 mass % to 80 mass %.Type: ApplicationFiled: July 8, 2020Publication date: October 29, 2020Inventors: Kouichirou Ochi, Yuya Chimoto, Tomoyo Miyakai, Takashi Hirasa
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Publication number: 20200310273Abstract: A toner has a toner particle containing a resin having an acid group, an aluminum pigment, and a fatty acid metal salt, wherein an acid value of the resin having an acid group is in a range of from 5 mg KOH/g to 25 mg KOH/g, and an amount of the resin having the acid group is 50% by mass or more; an amount of the aluminum pigment is in a range of from 10% by mass to 40% by mass; the fatty acid metal salt is represented by formula (R—COO)pM(OH)q; and an amount thereof is in a range of from 1 part by mass to 10 parts by mass based on 100 parts by mass of the aluminum pigment.Type: ApplicationFiled: June 16, 2020Publication date: October 1, 2020Inventors: Yuya Chimoto, Kouichirou Ochi, Tomoyo Miyakai, Takashi Hirasa
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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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Patent number: 10514624Abstract: A toner comprising: a toner particle that contains a resin component and a silicone compound, wherein the resin component contains at least 50 mass % of olefin resin; a content of the silicone compound is from 1 mass part to 42 mass parts per 100 mass parts of the resin component; a weight-average molecular weight of the silicone compound as measured by GPC is from 1,000 to 25,000; and a content, in a molecular weight distribution of the silicone compound as measured by GPC, of a component having a weight-average molecular weight of not more than 500 is not more than 0.05 mass % of the silicone compound.Type: GrantFiled: October 1, 2018Date of Patent: December 24, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Junichi Tamura, Hayato Ida, Kentaro Kamae, Ryuji Murayama, Takashi Hirasa
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Patent number: 10451990Abstract: A toner comprising a toner particle including a resin component, wherein the resin component includes an olefin copolymer including ester group having specific structures Y1 and Y2 and an olefin copolymer including acid group having an acid value of from 50 mg KOH/g to 300 mg KOH/g, the amount of the olefin copolymer including ester group is 50% by mass or more, the toner particle has a surface layer including the olefin copolymer including acid group which has formed a salt with a metal, the metal is at least one metal selected from the group consisting of Mg, Ca, Sr, Al, and Zn, and the total amount of the metal in the toner is from 25 ppm to 500 ppm.Type: GrantFiled: September 20, 2018Date of Patent: October 22, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Kamae, Ryuji Murayama, Junichi Tamura, Hayato Ida, Takashi Hirasa
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Patent number: 10353312Abstract: A toner including a toner particle having a core-shell structure that has a core formed from a resin 1 and a shell formed from a resin 2 on the surface of the core, wherein the resin 1 contains more than 50 mass % of an ester group-containing olefin-based copolymer, the ester group-containing olefin-based copolymer has a monomer unit Y1 represented by formula (1) below, and at least one type of monomer unit Y2 selected from the group consisting of monomer units represented by formula (2) and formula (3) below, the ester group concentration in the ester group-containing olefin-based copolymer is from 2 mass % to 18 mass %, and the resin 2 is an amorphous resin having a Tg value of from 50° C. to 70° C.Type: GrantFiled: August 7, 2018Date of Patent: July 16, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Kamae, Ryuji Murayama, Junichi Tamura, Hayato Ida, Takashi Hirasa
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Publication number: 20190113858Abstract: A toner comprising a toner particle including a resin component, wherein the resin component includes an olefin copolymer including ester group having specific structures Y1 and Y2 and an olefin copolymer including acid group having an acid value of from 50 mg KOH/g to 300 mg KOH/g, the amount of the olefin copolymer including ester group is 50% by mass or more, the toner particle has a surface layer including the olefin copolymer including acid group which has formed a salt with a metal, the metal is at least one metal selected from the group consisting of Mg, Ca, Sr, Al, and Zn, and the total amount of the metal in the toner is from 25 ppm to 500 ppm.Type: ApplicationFiled: September 20, 2018Publication date: April 18, 2019Inventors: Kentaro Kamae, Ryuji Murayama, Junichi Tamura, Hayato Ida, Takashi Hirasa