Patents by Inventor Haruko Kubo
Haruko Kubo 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: 10295922Abstract: A toner containing a toner particle including a binder resin, a resin A having a pKa of 6.0-9.0, and a pigment having a pKb of 4.0-7.0, wherein the pKa is an acid dissociation constant measured by preparing a resin solution in which 1.0 part by mass of the resin A, 70.0 parts by mass of toluene and 30.0 parts by mass of ethanol are mixed, and carrying out neutralization titration with a potassium hydroxide ethanol solution of 0.1 mol/L, and the pKb is a basic dissociation constant measured by preparing a pigment dispersion in which 10.0 parts by mass of the pigment, 140.0 parts by mass of toluene and 60.0 parts by mass of ethanol are mixed, and carrying out neutralization titration with a hydrochloric acid ethanol solution of 0.1 mol/L.Type: GrantFiled: March 13, 2017Date of Patent: May 21, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Yuhei Terui, Yu Yoshida, Haruko Kubo, Hitoshi Itabashi
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Patent number: 10095144Abstract: In a toner containing a binder resin, a pigment, a pigment dispersant, and a fixing assistant, the pigment dispersant has a structure represented by formula (1) or a tautomer thereof and a polymer moiety, the binder resin and the fixing assistant satisfy formula (2), and a hydrophobic parameter HP1 of the pigment dispersant and a hydrophobic parameter HP2 of the fixing assistant satisfy formula (3).Type: GrantFiled: August 26, 2016Date of Patent: October 9, 2018Assignee: Canon Kabushiki KaishaInventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Hitoshi Itabashi
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Patent number: 10078285Abstract: Provided is a toner comprising a toner particle containing: a binder resin; a pigment; a resin having an acidic functional group; and a fixing auxiliary agent, wherein the pigment is a pigment having a structure derived from a basic compound, and the binder resin and the fixing auxiliary agent satisfy following Formula (1): (TgA?TgB)?5.0° C.??Formula (1) and given HP1 as a hydrophobic parameter of the resin having an acidic functional group and HP2 as a hydrophobic parameter of the fixing auxiliary agent, the HP1 is at least 0.60, and following Formula (2) is satisfied: |HP1?HP2|?0.30??Formula (2).Type: GrantFiled: March 13, 2017Date of Patent: September 18, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Haruko Kubo, Yuhei Terui, Yu Yoshida, Hitoshi Itabashi
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Patent number: 10012922Abstract: A toner comprising a toner particle containing a pigment, a resin A and a resin B, wherein the pigment is a pigment having a structure derived from a basic compound, the resin A has an acidic functional group, the resin B has an acid value of at least 2.0 mg KOH/g, the resin B has a glass transition temperature TgB of at least 50° C., and the hydrophobic parameter HPA of the resin A and the hydrophobic parameter of the resin B satisfy the following formulae: HPA?0.60 HPB?0.70 HPA?HPB>0.Type: GrantFiled: March 13, 2017Date of Patent: July 3, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Hitoshi Itabashi
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Patent number: 9996018Abstract: In a toner containing a resin, a pigment, and a pigment dispersant, the resin contains a polar resin having an acid value of 2.0 to 30.0 mgKOH/g, and the pigment dispersant has the structure represented by the following formula (1) and a polymer moiety bonded thereto.Type: GrantFiled: August 30, 2016Date of Patent: June 12, 2018Assignee: Canon Kabushiki KaishaInventors: Haruko Kubo, Yu Yoshida, Yuhei Terui, Hitoshi Itabashi
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Patent number: 9964879Abstract: Provided is a toner comprising a toner particle containing a binder resin, a resin A, and a pigment, wherein the resin A has a pKa of at least 6.0 and not more than 9.0, and also has a hydrophobic parameter HPA of at least 0.65 and not more than 0.95.Type: GrantFiled: March 13, 2017Date of Patent: May 8, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Yuhei Terui, Yu Yoshida, Haruko Kubo, Hitoshi Itabashi
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Patent number: 9829814Abstract: 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: GrantFiled: February 17, 2016Date of Patent: November 28, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Masashi Kawamura, Yasuaki Murai, Takayuki Toyoda
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Publication number: 20170269495Abstract: A toner containing a toner particle including a binder resin, a resin A having a pKa of 6.0-9.0, and a pigment having a pKb of 4.0-7.0, wherein the pKa is an acid dissociation constant measured by preparing a resin solution in which 1.0 part by mass of the resin A, 70.0 parts by mass of toluene and 30.0 parts by mass of ethanol are mixed, and carrying out neutralization titration with a potassium hydroxide ethanol solution of 0.1 mol/L, and the pKb is a basic dissociation constant measured by preparing a pigment dispersion in which 10.0 parts by mass of the pigment, 140.0 parts by mass of toluene and 60.0 parts by mass of ethanol are mixed, and carrying out neutralization titration with a hydrochloric acid ethanol solution of 0.1 mol/L.Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Yuhei Terui, Yu Yoshida, Haruko Kubo, Hitoshi Itabashi
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Publication number: 20170269496Abstract: Provided is a toner comprising a toner particle containing: a binder resin; a pigment; a resin having an acidic functional group; and a fixing auxiliary agent, wherein the pigment is a pigment having a structure derived from a basic compound, and the binder resin and the fixing auxiliary agent satisfy following Formula (1): (TgA?TgB)?5.0° C.??Formula (1) and given HP1 as a hydrophobic parameter of the resin having an acidic functional group and HP2 as a hydrophobic parameter of the fixing auxiliary agent, the HP1 is at least 0.60, and following Formula (2) is satisfied: |HP1?HP2|?0.30??Formula (2).Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Haruko Kubo, Yuhei Terui, Yu Yoshida, Hitoshi Itabashi
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Publication number: 20170269491Abstract: Provided is a toner comprising a toner particle containing a binder resin, a resin A, and a pigment, wherein the resin A has a pKa of at least 6.0 and not more than 9.0, and also has a hydrophobic parameter HPA of at least 0.65 and not more than 0.95.Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Yuhei Terui, Yu Yoshida, Haruko Kubo, Hitoshi Itabashi
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Publication number: 20170269494Abstract: A toner comprising a toner particle containing a pigment, a resin A and a resin B, wherein the pigment is a pigment having a structure derived from a basic compound, the resin A has an acidic functional group, the resin B has an acid value of at least 2.0 mg KOH/g, the resin B has a glass transition temperature TgB of at least 50° C., and the hydrophobic parameter HPA of the resin A and the hydrophobic parameter of the resin B satisfy the following formulae: HPA?0.60 HPB?0.70 HPA?HPB>0.Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Hitoshi Itabashi
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Publication number: 20170060015Abstract: In a toner containing a resin, a pigment, and a pigment dispersant, the resin contains a polar resin having an acid value of 2.0 to 30.0 mgKOH/g, and the pigment dispersant has the structure represented by the following formula (1) and a polymer moiety bonded thereto.Type: ApplicationFiled: August 30, 2016Publication date: March 2, 2017Inventors: Haruko Kubo, Yu Yoshida, Yuhei Terui, Hitoshi Itabashi
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Publication number: 20170060013Abstract: In a toner containing a binder resin, a pigment, a pigment dispersant, and a fixing assistant, the pigment dispersant has a structure represented by formula (1) or a tautomer thereof and a polymer moiety, the binder resin and the fixing assistant satisfy formula (2), and a hydrophobic parameter HP1 of the pigment dispersant and a hydrophobic parameter HP2 of the fixing assistant satisfy formula (3).Type: ApplicationFiled: August 26, 2016Publication date: March 2, 2017Inventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Hitoshi Itabashi
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Patent number: 9505723Abstract: 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: GrantFiled: January 5, 2016Date of Patent: November 29, 2016Assignees: 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
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Publication number: 20160246192Abstract: 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: ApplicationFiled: February 17, 2016Publication date: August 25, 2016Inventors: Yu Yoshida, Yuhei Terui, Haruko Kubo, Masashi Kawamura, Yasuaki Murai, Takayuki Toyoda
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Publication number: 20160130233Abstract: 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: ApplicationFiled: January 5, 2016Publication date: May 12, 2016Inventors: Haruko Kubo, Suzuka Ueno, Junko Chizuwa, Tomoya Yamamoto, Hitoshi Itabashi, Yuhei Terui, Yu Yoshida, Yasuaki Murai, Takayuki Toyoda