Patents by Inventor Noritaka Toyoizumi
Noritaka Toyoizumi 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: 11966196Abstract: A toner comprising a toner particle that comprises a toner base particle and an outermost layer present on the toner base particle surface, the toner base particle containing a binder resin wherein a plurality of concave portions are formed on the toner particle surface, and when T (nm) is an average thickness of the outermost layer in analysis of a cross section of the toner particle as observed with TEM, and a (nm) is a long diameter, b (nm) is a short diameter and d (nm) is a depth of each of the concave portions, respectively, when the concave portions on the toner particle are measured by using SPM from an outermost surface of the outermost layer toward the toner particle center, when “n” represents a number of the concave portions that satisfy specific relationships per 1 ?m2 of the toner particle surface is 30 to 200.Type: GrantFiled: March 18, 2021Date of Patent: April 23, 2024Assignee: CANON KABUSHIKI KAISHAInventor: Noritaka Toyoizumi
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Patent number: 11899395Abstract: A toner comprising a toner particle, wherein the toner particle includes a toner base particle containing a binder resin and includes a protruded portion on a surface of the toner base particle; the protruded portion comprises an organosilicon polymer and a polyhydric acid metal salt; and the polyhydric acid metal salt is present on a surface of the protruded portion.Type: GrantFiled: November 9, 2022Date of Patent: February 13, 2024Assignee: CANON KABUSHIKI KAISHAInventors: Kenta Kamikura, Takashi Kenmoku, Noritaka Toyoizumi, Akane Masumoto, Yuzo Seino, Yu Yoshida
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Publication number: 20230176495Abstract: The pigment dispersion is a pigment dispersion including a fluorescent agent, wherein, when at a wavelength of 250 nm or more and 290 nm or less, an integral value of an emission intensity in a wavelength range of 400 nm or more and 700 nm or less of an emission spectrum of the fluorescent agent for excitation light is represented by F1, an integral value of an emission intensity in a wavelength range of 400 nm or more and 700 nm or less of an emission spectrum of the pigment dispersion for excitation light is represented by F2, and a ratio of the fluorescent agent contained in a solid content obtained when the pigment dispersion is heated at 130° C. until a change in mass of the pigment dispersion reaches 0.3%/min or less is represented by W1 (mass%), the F1, the F2, and the W1 satisfy the formulae F2x 100/W1?F1 ×0.30 and 5.0?W1?80.0.Type: ApplicationFiled: November 28, 2022Publication date: June 8, 2023Inventors: YU YOSHIDA, DAI NOZAKI, HARUMI TAKADA, SHIRO KUROKI, NORITAKA TOYOIZUMI, SHINSUKE MOCHIZUKI
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Publication number: 20230080900Abstract: A toner comprising a toner particle, wherein the toner particle includes a toner base particle containing a binder resin and includes a protruded portion on a surface of the toner base particle; the protruded portion comprises an organosilicon polymer and a polyhydric acid metal salt; and the polyhydric acid metal salt is present on a surface of the protruded portion.Type: ApplicationFiled: November 9, 2022Publication date: March 16, 2023Inventors: Kenta Kamikura, Takashi Kenmoku, Noritaka Toyoizumi, Akane Masumoto, Yuzo Seino, Yu Yoshida
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Patent number: 11531282Abstract: A toner comprising a toner particle, wherein the toner particle includes a toner base particle containing a binder resin and includes a protruded portion on a surface of the toner base particle; the protruded portion comprises an organosilicon polymer and a polyhydric acid metal salt; and the polyhydric acid metal salt is present on a surface of the protruded portion.Type: GrantFiled: July 22, 2020Date of Patent: December 20, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Kenta Kamikura, Takashi Kenmoku, Noritaka Toyoizumi, Akane Masumoto, Yuzo Seino, Yu Yoshida
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Patent number: 11448980Abstract: A toner comprising a toner particle comprising a binder resin and an azo dye, wherein the binder resin comprises a polymer A, the polymer A is a polymer having a monomer unit derived from methacrylonitrile, and a relationship among an amount of substance (mol) of the monomer unit derived from methacrylonitrile, an amount of substance (mol) of the azo dye, and the number of azo groups in the azo dye in the toner particle satisfies formula below: [(amount of substance of azo dye (mol))×(number of azo groups in azo dye)/(amount of substance of monomer unit derived from methacrylonitrile (mol))]?0.500.Type: GrantFiled: December 7, 2020Date of Patent: September 20, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Takashi Matsui, Noritaka Toyoizumi, Tsutomu Shimano, Kenji Aoki, Shohei Shibahara, Yuna Yamamoto
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Publication number: 20220128918Abstract: A toner comprising a toner particle comprising a binder resin, wherein the toner particle comprises a condensation product of an organosilicon compound, in time-of-flight secondary ion mass spectrometry of the toner particle, a normalized intensity of silicon ions derived from the condensation product of the organosilicon compound is from 7.00×10?4 to 3.00×10?2, a normalized intensity of silicon ions after sputtering the toner particle under a specific condition is 6.99×10?4 or lower, the toner comprises a fine particle on the surface of the toner particle, and the fine particle has at least one selected from the group consisting of a specific fine particle of a polyhydric acid metal salt, a strontium titanate fine particle, a titanium oxide fine particle and an aluminum oxide fine particles.Type: ApplicationFiled: October 15, 2021Publication date: April 28, 2022Inventors: Shohei Kototani, Takashi Kenmoku, Noritaka Toyoizumi, Yoshiaki Shiotari, Mayumi Inoue
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Patent number: 11169458Abstract: A toner including a toner particle, wherein the toner particle includes a toner base particle containing a binder resin, and a shell on the surface of the toner base particle; the shell contains a metal compound and an organosilicon polymer; the shell has at least an exposed portion of the metal compound and an exposed portion of the organosilicon polymer, on the surface of the toner particle; and in an analysis of a cross section of the toner particle by TEM-EDX, Ha (nm) and Hb (nm) which are average distances from the interface of the toner base particle and the shell up to the toner particle surface at the exposed portion of the metal compound and at the exposed portion of the organosilicon polymer, respectively, on the toner particle surface, satisfy Expression (1) below: Hb>Ha+20.0??(1).Type: GrantFiled: July 22, 2020Date of Patent: November 9, 2021Assignee: CANON KABUSHIKI KAISHAInventors: Noritaka Toyoizumi, Takashi Kenmoku, Yuzo Seino, Kenta Kamikura, Yu Yoshida, Akane Masumoto
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Publication number: 20210302851Abstract: A toner comprising a toner particle that comprises a toner base particle and an outermost layer present on the toner base particle surface, the toner base particle containing a binder resin wherein a plurality of concave portions are formed on the toner particle surface, and when T (nm) is an average thickness of the outermost layer in analysis of a cross section of the toner particle as observed with TEM, and a (nm) is a long diameter, b (nm) is a short diameter and d (nm) is a depth of each of the concave portions, respectively, when the concave portions on the toner particle are measured by using SPM from an outermost surface of the outermost layer toward the toner particle center, when “n” represents a number of the concave portions that satisfy specific relationships per 1 ?m2 of the toner particle surface is 30 to 200.Type: ApplicationFiled: March 18, 2021Publication date: September 30, 2021Inventor: Noritaka Toyoizumi
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Publication number: 20210181646Abstract: A toner comprising a toner particle comprising a binder resin and an azo dye, wherein the binder resin comprises a polymer A, the polymer A is a polymer having a monomer unit derived from methacrylonitrile, and a relationship among an amount of substance (mol) of the monomer unit derived from methacrylonitrile, an amount of substance (mol) of the azo dye, and the number of azo groups in the azo dye in the toner particle satisfies formula below: [(amount of substance of azo dye (mol))×(number of azo groups in azo dye)/(amount of substance of monomer unit derived from methacrylonitrile (mol))]?0.500.Type: ApplicationFiled: December 7, 2020Publication date: June 17, 2021Inventors: Takashi Matsui, Noritaka Toyoizumi, Tsutomu Shimano, Kenji Aoki, Shohei Shibahara, Yuna Yamamoto
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Publication number: 20210026265Abstract: A toner comprising a toner particle, wherein the toner particle includes a toner base particle containing a binder resin and includes a protruded portion on a surface of the toner base particle; the protruded portion comprises an organosilicon polymer and a polyhydric acid metal salt; and the polyhydric acid metal salt is present on a surface of the protruded portion.Type: ApplicationFiled: July 22, 2020Publication date: January 28, 2021Inventors: Kenta Kamikura, Takashi Kenmoku, Noritaka Toyoizumi, Akane Masumoto, Yuzo Seino, Yu Yoshida
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Publication number: 20210026266Abstract: A toner including a toner particle, wherein the toner particle includes a toner base particle containing a binder resin, and a shell on the surface of the toner base particle; the shell contains a metal compound and an organosilicon polymer; the shell has at least an exposed portion of the metal compound and an exposed portion of the organosilicon polymer, on the surface of the toner particle; and in an analysis of a cross section of the toner particle by TEM-EDX, Ha (nm) and Hb (nm) which are average distances from the interface of the toner base particle and the shell up to the toner particle surface at the exposed portion of the metal compound and at the exposed portion of the organosilicon polymer, respectively, on the toner particle surface, satisfy Expression (1) below:Type: ApplicationFiled: July 22, 2020Publication date: January 28, 2021Inventors: Noritaka Toyoizumi, Takashi Kenmoku, Yuzo Seino, Kenta Kamikura, Yu Yoshida, Akane Masumoto
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Patent number: 10409180Abstract: A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.Type: GrantFiled: February 6, 2018Date of Patent: September 10, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Shinnosuke Koji, Sakae Suda, Yusuke Kosaki, Shohei Fukuya, Tetsuya Kinumatsu, Kenji Aoki, Toshifumi Mori, Shuntaro Watanabe, Noritaka Toyoizumi, Atsushi Tani, Kazumichi Nakahama
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Patent number: 10078280Abstract: A method for producing a toner particle include: (a) mixing a binder resin A, resin fine particles containing a resin B, a resin C, an organic solvent, and carbon dioxide, thereby forming a droplet of a resin solution containing the binder resin A, covered with the resin fine particles; (b) applying a pressure by introducing carbon dioxide, thereby precipitating the resin C at the surface of the droplet; and (c) passing carbon dioxide so as to remove the organic solvent from the droplet with the carbon dioxide. The resin C has an organic polysiloxane structure and a weight average molecular weight of 50,000 to 500,000. The ratio of the weight average molecular weight to the number average molecular weight of the resin C is not more than 5.0. The proportion of the resin C to the rein fine particles is 5.0% by mass to 50.0% by mass.Type: GrantFiled: June 14, 2017Date of Patent: September 18, 2018Assignee: Canon Kabushiki KaishaInventors: Kenji Aoki, Yusuke Kosaki, Noritaka Toyoizumi, Tetsuya Kinumatsu, Toshifumi Mori, Sakae Suda, Shinnosuke Koji, Shuntaro Watanabe, Kazumichi Nakahama, Atsushi Tani, Takashige Kasuya
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Publication number: 20180231901Abstract: A method of producing a toner including the steps of: mixing resin fine particles, an organic solvent, and a resin R with a dispersion medium containing carbon dioxide, to prepare a dispersion of resin R-containing droplets; and removing the organic solvent by flowing carbon dioxide, wherein the resin fine particles contain one or more resins that have a partial structure A, B, and C, and are soluble in chloroform; the SP value of the partial structure A, the resin R, and the partial structure B satisfy particular relationships; a resin A constituted of the partial structure A and a resin B constituted of the partial structure B are soluble in the organic solvent; and a resin C constituted of the partial structure C is insoluble in the organic solvent.Type: ApplicationFiled: February 6, 2018Publication date: August 16, 2018Inventors: Shinnosuke Koji, Sakae Suda, Yusuke Kosaki, Shohei Fukuya, Tetsuya Kinumatsu, Kenji Aoki, Toshifumi Mori, Shuntaro Watanabe, Noritaka Toyoizumi, Atsushi Tani, Kazumichi Nakahama
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Patent number: 9964876Abstract: A toner includes toner particles which contain a binder resin, a colorant, a wax, and a resin A having an organic polysiloxane structure; the amount of Si atoms of the toner particles is 4.5 to 10.0; in an analysis of a cross-section of each toner particle, in a surface layer region R from the periphery of the cross-section of the toner particle to the inside at a distance of 10.0% of the particle diameter in the cross-section of the toner particle, the content of Si atoms derived from the organic polysiloxane structure is 90.0% or more with respect to the total amount of Si atoms contained in the toner particle; and in a line analysis along a straight line between the periphery of the surface layer region R and a gravity center of the cross-section, an intensity count of Si atoms in the toner particle satisfies formula Si0>Si1>Si2>Si3?0.Type: GrantFiled: July 24, 2017Date of Patent: May 8, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Noritaka Toyoizumi, Yusuke Kosaki, Tetsuya Kinumatsu, Kenji Aoki, Toshifumi Mori, Sakae Suda, Shinnosuke Koji, Shuntaro Watanabe, Kazumichi Nakahama, Atsushi Tani, Takashige Kasuya
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Publication number: 20180031988Abstract: A toner includes toner particles which contain a binder resin, a colorant, a wax, and a resin A having an organic polysiloxane structure; the amount of Si atoms of the toner particles is 4.5 to 10.0; in an analysis of a cross-section of each toner particle, in a surface layer region R from the periphery of the cross-section of the toner particle to the inside at a distance of 10.0% of the particle diameter in the cross-section of the toner particle, the content of Si atoms derived from the organic polysiloxane structure is 90.0% or more with respect to the total amount of Si atoms contained in the toner particle; and in a line analysis along a straight line between the periphery of the surface layer region R and a gravity center of the cross-section, an intensity count of Si atoms in the toner particle satisfies formula Si0>Si1>Si2>Si3?0.Type: ApplicationFiled: July 24, 2017Publication date: February 1, 2018Inventors: Noritaka Toyoizumi, Yusuke Kosaki, Tetsuya Kinumatsu, Kenji Aoki, Toshifumi Mori, Sakae Suda, Shinnosuke Koji, Shuntaro Watanabe, Kazumichi Nakahama, Atsushi Tani, Takashige Kasuya
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Patent number: 9869943Abstract: A method of producing a toner containing a toner particle, including the steps of: a) preparing a resin solution by mixing a resin A and an organic solvent, b) mixing the resin solution, a resin fine particle containing a resin B, and a dispersion medium to form a droplet of the resin solution whose surface has been covered with the resin fine particle, and c) removing the organic solvent in the droplet, in which the resin B is a polymer of a monomer composition containing a monomer X having polymerizable unsaturated groups at the both ends; the monomer X has a peak molecular weight of 5,000 to 50,000; the content of the monomer X is 0.10% to 3.00% by mol; and the following formula (1) is satisfied, |SPX?SPA|?2.0??(1) where SPA and SPX represent solubility parameters of the resin A and the monomer X, respectively.Type: GrantFiled: October 12, 2016Date of Patent: January 16, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Kenji Aoki, Yusuke Kosaki, Tetsuya Kinumatsu, Shuntaro Watanabe, Noritaka Toyoizumi, Atsushi Tani, Takashige Kasuya
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Patent number: 9857713Abstract: Provided is a toner, comprising a toner particle having a core-shell structure composed of a core particle and a shell phase on a surface of the core particle, the core particle containing a resin X and a colorant, the shell phase being derived from a resin fine particle containing a resin Y, in which a relationship among a SP value of the resin X, a SP value of the resin Y, and a SP value of an organic solvent falls within a specific range, and a relationship between a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in water and a number-average particle diameter of the resin fine particle when the resin fine particle is dispersed in the organic solvent falls within a specific range.Type: GrantFiled: December 17, 2015Date of Patent: January 2, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Yusuke Kosaki, Tetsuya Kinumatsu, Kenji Aoki, Noritaka Toyoizumi, Shuntaro Watanabe, Takaaki Kaya, Atsushi Tani, Takashige Kasuya, Kazumichi Nakahama, Shinnosuke Koji
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Publication number: 20170363979Abstract: A method for producing a toner particle include: (a) mixing a binder resin A, resin fine particles containing a resin B, a resin C, an organic solvent, and carbon dioxide, thereby forming a droplet of a resin solution containing the binder resin A, covered with the resin fine particles; (b) applying a pressure by introducing carbon dioxide, thereby precipitating the resin C at the surface of the droplet; and (c) passing carbon dioxide so as to remove the organic solvent from the droplet with the carbon dioxide. The resin C has an organic polysiloxane structure and a weight average molecular weight of 50,000 to 500,000. The ratio of the weight average molecular weight to the number average molecular weight of the resin C is not more than 5.0. The proportion of the resin C to the rein fine particles is 5.0% by mass to 50.0% by mass.Type: ApplicationFiled: June 14, 2017Publication date: December 21, 2017Inventors: Kenji Aoki, Yusuke Kosaki, Noritaka Toyoizumi, Tetsuya Kinumatsu, Toshifumi Mori, Sakae Suda, Shinnosuke Koji, Shuntaro Watanabe, Kazumichi Nakahama, Atsushi Tani, Takashige Kasuya