Patents by Inventor Tsuneyoshi Tominaga
Tsuneyoshi Tominaga 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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Publication number: 20170329246Abstract: Disclosed is a toner including toner particles each including a core portion that contains a binder resin, and a surface layer containing an organosilicon polymer, in which each of the toner particles contains a polyvalent metal element having a resistivity of 2.5×10?8 ?·m or more and 10.0×10?8 ?·m or less at 20° C., and when the toner particles are subjected to X-ray fluorescence analysis, a net intensity originating from the polyvalent metal element is 0.10 kcps or more and 30.00 kcps or less.Type: ApplicationFiled: May 8, 2017Publication date: November 16, 2017Inventors: Kentaro Yamawaki, Shiro Kuroki, Toshihiko Katakura, Akane Masumoto, Tsuneyoshi Tominaga
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Patent number: 9785077Abstract: The present invention provides a toner having a toner particle that contains a binder resin and an organic silicon polymer, wherein the organic silicon polymer has a specific structure, the proportion of the specific structure to the number of a silicon atom in the organic silicon polymer contained in the toner particle is at least 5.0%, the toner particle contain a polyester resin of from at least 1.0% by mass to less than 80% by mass, and the polyester resin is a specific polymer.Type: GrantFiled: October 8, 2014Date of Patent: October 10, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Koji Abe, Yuhei Terui, Katsuyuki Nonaka, Tsuneyoshi Tominaga
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Publication number: 20170269488Abstract: A toner having a toner particle which contains a binder resin, a fatty acid metal salt, and a resin having an ionic functional group, in which the fatty acid metal salt is a fatty acid metal salt of a polyvalent metal with valency of 2 or higher and a fatty acid with carbon atom number of at least 8 and not more than 28, and the acid dissociation constant pKa of the resin having an ionic functional group is at least 6.0 and not more than 9.0.Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Shinsuke Mochizuki, Kenichi Nakayama, Masashi Kawamura, Tsuneyoshi Tominaga, Kunihiko Nakamura, Tsutomu Shimano, Takayuki Toyoda, Shiro Kuroki
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Patent number: 9733583Abstract: Provided is a toner, including toner particle having surface layer, in which: the surface layer includes organosilicon polymer which has a partial structure represented by formula (1); in 29Si-NMR measurement of tetrahydrofuran-insoluble matter of toner particle, a ratio of a peak area for the partial structure represented by formula (1) to a total peak area for the organosilicon polymer is 5.0% or more; in X-ray photoelectron spectroscopic analysis of a surface of toner particle, a ratio of a density of a silicon atom dSi in the surface of toner particle is 1.0 to 28.6 atom %; and in a roughness curve of toner particle measured by using a scanning probe microscope: an arithmetic average roughness Ra is 10 to 300 nm; ?Ra/Ra is 0.60 or less; an average length RSm of a roughness curve element is 20 to 500 nm; and ?RSm/RSm is 0.60 or less.Type: GrantFiled: April 1, 2016Date of Patent: August 15, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Shiro Kuroki, Katsuyuki Nonaka, Koji Abe, Toshihiko Katakura, Tsuneyoshi Tominaga, Sara Yoshida
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Patent number: 9733584Abstract: Provided is a toner that is improved in transferability as compared to the related art and that keeps its effects through repeated use. In particular, provided is a toner suppressed in dependency on transfer current control. The toner includes a toner particle including a surface layer containing an organosilicon polymer and a resin having an ionic functional group, the organosilicon polymer having a partial structure represented by the following formula (1), the toner particle containing 5.0% or more of the partial structure represented by the formula (1) per 1.000 silicon atom contained in the organosilicon polymer, the resin having an ionic functional group having a pKa of 6.0 or more and 9.0 or less: R0—SiO3/2??(1) in the formula (1), R0 represents an alkyl group having 1 or more and 6 or less carbon atoms, or a phenyl group.Type: GrantFiled: April 1, 2016Date of Patent: August 15, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Akane Masumoto, Katsuyuki Nonaka, Koji Abe, Toshihiko Katakura, Tsuneyoshi Tominaga, Shiro Kuroki
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Publication number: 20170227864Abstract: A toner comprising: a toner particle containing a toner base particle containing a binder resin and a colorant, and a resin particle fixed to a surface of the toner base particle; and an inorganic fine particle A, wherein the surface of the toner particle has protruded portions originating in the resin particle, an average length (D) of long sides of the protruded portions is 50 nm to 300 nm, an average Height (H) of the protruded portions is 25 nm to 250 nm, the average long-side length and the average height of the protruded portions satisfies a specific relationship, and an average value of a compactness of the inorganic fine particle A is 0.40 to 0.80, and the attachment rate of the inorganic fine particles A is 0.1% to 5.0% by area.Type: ApplicationFiled: January 31, 2017Publication date: August 10, 2017Inventors: Yojiro Hotta, Kazuo Terauchi, Tsuneyoshi Tominaga, Akane Masumoto, Takuya Mizuguchi, Motohide Shiozawa, Takeshi Naka, Masami Fujimoto, Shingo Ito, Kousuke Yamamoto, Yasukazu Ikami
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Patent number: 9720340Abstract: Provided is a toner that has satisfactory chargeability and hardly causes a reduction in image density, fogging, and density unevenness in various environments ranging from a low-temperature and low-humidity environment to a high-temperature and high-humidity environment. The toner includes toner particles obtained by fixing resin particles to toner base particles each containing resins, in which: the resins contain 50.0 mass % or more of a styrene-acrylic resin and 1.0 to 40.0 mass % of a polyester resin A; the polyester resin A contains 0.10 to 30.00 number % of an isosorbide unit; the fixing amount of the resin particles to the toner base particles is from 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the toner base particles; and the glass transition temperature of the resin particles is higher than the glass transition temperature of the toner base particles.Type: GrantFiled: May 8, 2015Date of Patent: August 1, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Tsuneyoshi Tominaga, Yasushi Katsuta, Katsuyuki Nonaka, Taiji Katsura, Akane Masumoto, Harumi Takada, Kohei Mizushima
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Patent number: 9556300Abstract: A method for manufacturing resin particles, including the step of producing the resin particles by using a liquid which is prepared with a resin having an ionic functional group and a pKa of 6.0 to 9.0, an organic solvent, which can dissolve the resin and which has a solubility parameter of 12.0 or less, water, and a neutralizer, wherein the neutralizer contains an acid having a pKa of 3.0 or less or a base having a pKb of 3.0 or less.Type: GrantFiled: August 26, 2015Date of Patent: January 31, 2017Assignee: Canon Kabushiki KaishaInventors: Kunihiko Nakamura, Akane Masumoto, Tsuneyoshi Tominaga
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Patent number: 9529289Abstract: A method is provided for producing toner particles containing an organosilicon polymer, produced by mixing an organosilicon compound and an aqueous medium containing base particles, and polymerizing the organosilicon compound. The organosilicon compound has a particular structure represented by formula (1) or (2). The organosilicon polymer is produced by polymerization at 80.0° C. or more and 105.0° C. or less.Type: GrantFiled: June 22, 2015Date of Patent: December 27, 2016Assignee: Canon Kabushiki KaishaInventors: Koji Abe, Toshihiko Katakura, Akane Masumoto, Tsuneyoshi Tominaga, Shiro Kuroki, Sara Inoue
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Publication number: 20160299447Abstract: Provided is a toner that is improved in transferability as compared to the related art and that keeps its effects through repeated use. In particular, provided is a toner suppressed in dependency on transfer current control. The toner includes a toner particle including a surface layer containing an organosilicon polymer and a resin having an ionic functional group, the organosilicon polymer having a partial structure represented by the following formula (1), the toner particle containing 5.0% or more of the partial structure represented by the formula (1) per 1.000 silicon atom contained in the organosilicon polymer, the resin having an ionic functional group having a pKa of 6.0 or more and 9.0 or less: R0—SiO3/2 ??(1) in the formula (1), R0 represents an alkyl group having 1 or more and 6 or less carbon atoms, or a phenyl group.Type: ApplicationFiled: April 1, 2016Publication date: October 13, 2016Inventors: Akane Masumoto, Katsuyuki Nonaka, Koji Abe, Toshihiko Katakura, Tsuneyoshi Tominaga, Shiro Kuroki
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Publication number: 20160299446Abstract: Provided is a toner, including toner particle having surface layer, in which: the surface layer includes organosilicon polymer which has a partial structure represented by formula (1); in 29Si—NMR measurement of tetrahydrofuran-insoluble matter of toner particle, a ratio of a peak area for the partial structure represented by formula (1) to a total peak area for the organosilicon polymer is 5.0% or more; in X-ray photoelectron spectroscopic analysis of a surface of toner particle, a ratio of a density of a silicon atom dSi in the surface of toner particle is 1.0 to 28.6 atom %; and in a roughness curve of toner particle measured by using a scanning probe microscope: an arithmetic average roughness Ra is 10 to 300 nm; ?Ra/Ra is 0.60 or less; an average length RSm of a roughness curve element is 20 to 500 nm; and ?RSm/RSm is 0.60 or less.Type: ApplicationFiled: April 1, 2016Publication date: October 13, 2016Inventors: Shiro Kuroki, Katsuyuki Nonaka, Koji Abe, Toshihiko Katakura, Tsuneyoshi Tominaga, Sara Yoshida
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Patent number: 9423708Abstract: A method for producing a toner particle having high charging stability and durability under environments at high temperature and high humidity is provided. A method for producing a toner particle including an step of adhering a resin particle to surface of a toner base particle containing a binder resin and a colorant in an aqueous medium, wherein the resin particle contain a resin having an ionic functional group and having an acid dissociation constant pKa of 6.0 or more and 9.0 or less, and the pH (hydrogen ion concentration) of the aqueous medium is equal to or greater than pKa of the resin particle?2.0.Type: GrantFiled: March 19, 2015Date of Patent: August 23, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Tsuneyoshi Tominaga, Kunihiko Nakamura, Akane Masumoto
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Publication number: 20150378275Abstract: A method is provided for producing toner particles containing an organosilicon polymer, produced by mixing an organosilicon compound and an aqueous medium containing base particles, and polymerizing the organosilicon compound. The organosilicon compound has a particular structure represented by formula (1) or (2). The organosilicon polymer is produced by polymerization at 80.0° C. or more and 105.0° C. or less.Type: ApplicationFiled: June 22, 2015Publication date: December 31, 2015Inventors: Koji Abe, Toshihiko Katakura, Akane Masumoto, Tsuneyoshi Tominaga, Shiro Kuroki, Sara Inoue
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Publication number: 20150361205Abstract: A method for manufacturing resin particles, including the step of producing the resin particles by using a liquid which is prepared with a resin having an ionic functional group and a pKa of 6.0 to 9.0, an organic solvent, which can dissolve the resin and which has a solubility parameter of 12.0 or less, water, and a neutralizer, wherein the neutralizer contains an acid having a pKa of 3.0 or less or a base having a pKb of 3.0 or less.Type: ApplicationFiled: August 26, 2015Publication date: December 17, 2015Inventors: Kunihiko Nakamura, Akane Masumoto, Tsuneyoshi Tominaga
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Publication number: 20150331344Abstract: Provided is a toner that has satisfactory chargeability and hardly causes a reduction in image density, fogging, and density unevenness in various environments ranging from a low-temperature and low-humidity environment to a high-temperature and high-humidity environment. The toner includes toner particles obtained by fixing resin particles to toner base particles each containing resins, in which: the resins contain 50.0 mass % or more of a styrene-acrylic resin and 1.0 to 40.0 mass % of a polyester resin A; the polyester resin A contains 0.10 to 30.00 number % of an isosorbide unit; the fixing amount of the resin particles to the toner base particles is from 0.1 to 5.0 parts by mass with respect to 100 parts by mass of the toner base particles; and the glass transition temperature of the resin particles is higher than the glass transition temperature of the toner base particles.Type: ApplicationFiled: May 8, 2015Publication date: November 19, 2015Inventors: Tsuneyoshi Tominaga, Yasushi Katsuta, Katsuyuki Nonaka, Taiji Katsura, Akane Masumoto, Harumi Takada, Kohei Mizushima
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Publication number: 20150286157Abstract: The present invention is directed to providing a toner having no environmental difference in charging performance, and having high stability of images after output of a large number of copies under environments at high temperature and high humidity in a higher-speed one-component developing system, and a method for producing the toner, and the toner comprises a toner particle including a toner base particle containing a binder resin, a colorant and a releasing agent; and a resin particle adhering to the surface of the toner base particle, wherein the resin particle contains a resin A, and the resin A has an ionic functional group and an acid dissociation constant pKa of 7.0 or more and 9.Type: ApplicationFiled: June 19, 2015Publication date: October 8, 2015Inventors: Akane Masumoto, Kunihiko Nakamura, Tsuneyoshi Tominaga
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Publication number: 20150277251Abstract: A method for producing a toner particle having high charging stability and durability under environments at high temperature and high humidity is provided. A method for producing a toner particle including an step of adhering a resin particle to surface of a toner base particle containing a binder resin and a colorant in an aqueous medium, wherein the resin particle contain a resin having an ionic functional group and having an acid dissociation constant pKa of 6.0 or more and 9.0 or less, and the pH (hydrogen ion concentration) of the aqueous medium is equal to or greater than pKa of the resin particle?2.0.Type: ApplicationFiled: March 19, 2015Publication date: October 1, 2015Inventors: Tsuneyoshi Tominaga, Kunihiko Nakamura, Akane Masumoto
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Publication number: 20150099220Abstract: The present invention provides a toner having a toner particle that contains a binder resin and an organic silicon polymer, wherein the organic silicon polymer has a specific structure, the proportion of the specific structure to the number of a silicon atom in the organic silicon polymer contained in the toner particle is at least 5.0%, the toner particle contain a polyester resin of from at least 1.0% by mass to less than 80% by mass, and the polyester resin is a specific polymer.Type: ApplicationFiled: October 8, 2014Publication date: April 9, 2015Inventors: Koji Abe, Yuhei Terui, Katsuyuki Nonaka, Tsuneyoshi Tominaga
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Patent number: 8551680Abstract: Toner characterized in that assuming that the glass transition point of the toner measured by a differential scanning calorimeter (DSC) is represented by T1(° C.), in a micro compression test at T1?10 (° C.), when a load from 0.00N (0.00 mgf) to 7.85×10?4 N (80.00 mgf) is applied at the intervals of 7.85×10?7 N (0.08 mgf) to a single particle of the toner, the strain value A80a(%) at 7.85×10?4 N is 35.0 to 75.0%; and in a load (x-axis)-strain (y-axis) curve obtained by the micro compression test, the ratio of an area (S1a) of a specific region, relative to an area (S2a) of a specific region, (S1a/S2a), is 1.5 to 3.5.Type: GrantFiled: March 13, 2012Date of Patent: October 8, 2013Assignee: Canon Kabushiki KaishaInventors: Yasukazu Ayaki, Atsushi Tani, Tsuneyoshi Tominaga
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Patent number: 8524434Abstract: A toner having a toner particle including a core particle obtained by polymerizing a polymerizable monomer composition containing at least a polymerizable monomer, a colorant, a release agent, a polar resin, and a crystalline polyester in an aqueous medium and an outer shell formed by fixing resin fine particles to the surface of the core particle, wherein the resin constituting the resin fine particles is an amorphous resin and the acid value of the resin fine particles is 4.0 to 50.0 mgKOH/g.Type: GrantFiled: June 9, 2011Date of Patent: September 3, 2013Assignee: Canon Kabushiki KaishaInventors: Tsuneyoshi Tominaga, Ryoichi Fujita, Tsutomu Shimano