Patents by Inventor Kohji Takenaka
Kohji Takenaka 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: 11698594Abstract: A toner including a toner particle comprising a binder resin and a crystalline polyester, wherein the binder resin contains a polyester having a structure represented by the following formula (1): in formula (1), Rs each independently represent hydrogen, a methyl group, or a phenyl group; A represents a polyester segment; B represents a polyester segment or any functional group selected from the group consisting of —R1OH, —R1COOH, and —R1NH2 wherein R1 represents a single bond or a C1-4 alkylene group; and the average repeat number n is 10 to 80.Type: GrantFiled: April 6, 2021Date of Patent: July 11, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Toru Takahashi, Nobuyoshi Sugahara, Hitoshi Sano, Kazunari Ooyama, Yuu Nishimura, Kohji Takenaka, Koh Ishigami
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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: 20210223710Abstract: A toner including a toner particle comprising a binder resin and a crystalline polyester, wherein the binder resin contains a polyester having a structure represented by the following formula (1): in formula (1), Rs each independently represent hydrogen, a methyl group, or a phenyl group; A represents a polyester segment; B represents a polyester segment or any functional group selected from the group consisting of —R1OH, —R1COOH, and —R1NH2 wherein R1 represents a single bond or a C1-4 alkylene group; and the average repeat number n is 10 to 80.Type: ApplicationFiled: April 6, 2021Publication date: July 22, 2021Inventors: Toru Takahashi, Nobuyoshi Sugahara, Hitoshi Sano, Kazunari Ooyama, Yuu Nishimura, Kohji Takenaka, Koh Ishigami
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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: 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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Patent number: 9671707Abstract: Provided is an apparatus for heat treatment capable of heat-treating toner particles efficiently and uniformly while suppressing increase of coarse particles due to coalescence, to thereby enable stable toner production. The apparatus for heat-treating powder particles each of which contains a binder resin and a colorant includes: a cylindrical treatment chamber in which the powder particles are heat-treated; a columnar member (6) provided so as to protrude from a lower end part of the treatment chamber toward an upper end part thereof; a powder particle supply unit (2) for supplying the powder particles to the treatment chamber; a hot air supply unit (3) for heat-treating the supplied powder particles; and a collection unit (5) for collecting the heat-treated powder particles discharged outside the treatment chamber through a toner discharge port provided on the lower end part side of the treatment chamber.Type: GrantFiled: June 7, 2012Date of Patent: June 6, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Hironori Minagawa, Yuichi Mizo, Takeshi Ohtsu, Takakuni Kobori, Kohji Takenaka, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita, Yasumori Kanai
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Patent number: 9665021Abstract: A heat treating apparatus for powder particles including a cylindrical treating chamber; a powder particle-supplying unit; a hot air-supplying unit that supplies hot air for heat-treating powder particles; a cold air-supplying unit that supplies cold air for cooling the heat-treated powder particles; a regulating unit for regulating a flow of the supplied powder particles; and a recovering unit that recovers the heat-treated powder particles. The regulating unit is a substantially circular columnar member, the hot air-supplying unit has an outlet opposite to the upper end portion of the columnar member, and the regulating unit is equipped with a substantially conic distributing member for distributing the supplied hot air in a circumferential direction and a rotating member for rotating the distributed hot air in a spiral manner, on the center of the upper end portion.Type: GrantFiled: June 11, 2012Date of Patent: May 30, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Ohtsu, Yuichi Mizo, Hironori Minagawa, Takakuni Kobori, Kohji Takenaka, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita
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Patent number: 9665026Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.Type: GrantFiled: July 27, 2016Date of Patent: May 30, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
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Publication number: 20160334728Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.Type: ApplicationFiled: July 27, 2016Publication date: November 17, 2016Inventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
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Patent number: 9436112Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.Type: GrantFiled: September 11, 2014Date of Patent: September 6, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
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Patent number: 9417540Abstract: Provided is a toner obtained by melting and kneading a binder resin containing a polyester resin A and a polyester resin B, a colorant, and a wax, in which in the resin A, the content of a polyhydric alcohol unit derived from an aromatic diol, the content of a polyhydric alcohol unit derived from an oxyalkylene ether of a novolac type phenol resin, and the content of a polyvalent carboxylic acid unit derived from an aliphatic dicarboxylic acid, which contains a straight-chain hydrocarbon having 4 or more to 16 or less carbon atoms as a main chain and has carboxyl groups at both of its terminals, fall within specific ranges, and in the resin B, the content of a polyhydric alcohol unit derived from an aromatic diol and the content of a polyvalent carboxylic acid unit derived from an aromatic dicarboxylic acid or a derivative thereof fall within specific ranges.Type: GrantFiled: December 12, 2014Date of Patent: August 16, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Hashimoto, Hideki Kaneko, Nozomu Komatsu, Takakuni Kobori, Yosuke Iwasaki, Ichiro Kanno, Kohji Takenaka, Hiroyuki Fujikawa
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Patent number: 9372420Abstract: A heat treating apparatus for powder particles containing a binder resin and a colorant, the heat treating apparatus including: a treating chamber in which a heat treatment of the powder particles is performed; a raw material-supplying unit for supplying the powder particles to the treating chamber; a hot air-supplying unit that supplies hot air to the treating chamber; a cold air-supplying unit that supplies cold air for cooling the heat-treated powder particles; and a recovering unit that recovers the heat-treated powder particles. The raw material-supplying unit includes an introducing tube and a distributing member, and the distributing member is provided with a protruding member on a portion opposite to an outlet portion of the introducing tube, and the distributing member includes a supplying tube including two or more flow paths that extend radially outwardly from the protruding member to a wall surface of the treating chamber.Type: GrantFiled: June 11, 2012Date of Patent: June 21, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Yuichi Mizo, Hironori Minagawa, Takakuni Kobori, Kohji Takenaka, Takeshi Ohtsu, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita
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Publication number: 20160091824Abstract: A developer supply cartridge includes a developer supply container. The developer supply container includes a developer accommodation section, a developer in the developer accommodation section, a discharging port configured to discharge the developer toward a developer supply apparatus, a pump unit configured to perform an exhaust operation through the discharging port, a developer storage section configured to store a certain amount of developer before discharge, the developer storage section communicating with the developer accommodation section and being in contact with the discharging port, and a suppression part configured to control inflow and suppression of inflow of the developer from the developer accommodation section to the developer storage section and suppress the inflow of the developer during the exhaust operation of the pump unit. The developer has a compressibility Ct of 30.0% or more and 45.0% or less.Type: ApplicationFiled: September 25, 2015Publication date: March 31, 2016Inventors: Takakuni Kobori, Hiroyuki Fujikawa, Nozomu Komatsu, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Yosuke Iwasaki, Ichiro Kanno, Nobuyuki Yomoda, Akihito Kamura, Manabu Jimba, Ayatomo Okino
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Publication number: 20150185650Abstract: Provided is a toner obtained by melting and kneading a binder resin containing a polyester resin A and a polyester resin B, a colorant, and a wax, in which in the resin A, the content of a polyhydric alcohol unit derived from an aromatic diol, the content of a polyhydric alcohol unit derived from an oxyalkylene ether of a novolac type phenol resin, and the content of a polyvalent carboxylic acid unit derived from an aliphatic dicarboxylic acid, which contains a straight-chain hydrocarbon having 4 or more to 16 or less carbon atoms as a main chain and has carboxyl groups at both of its terminals, fall within specific ranges, and in the resin B, the content of a polyhydric alcohol unit derived from an aromatic diol and the content of a polyvalent carboxylic acid unit derived from an aromatic dicarboxylic acid or a derivative thereof fall within specific ranges.Type: ApplicationFiled: December 12, 2014Publication date: July 2, 2015Inventors: Takeshi Hashimoto, Hideki Kaneko, Nozomu Komatsu, Takakuni Kobori, Yosuke Iwasaki, Ichiro Kanno, Kohji Takenaka, Hiroyuki Fujikawa
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Publication number: 20150086917Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.Type: ApplicationFiled: September 11, 2014Publication date: March 26, 2015Inventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
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Publication number: 20140137428Abstract: A heat treatment apparatus for heat-treating powder particles each containing a binder resin and a colorant includes: a powder particle supply unit (3); a hot air supply unit (2); a cold air supply unit (4); a regulating unit (6); and a collection unit (5). The apparatus is characterized in that: a protrusion with a height of 2 mm or more and 50 mm or less is provided in a region on a downstream side of the powder particle supply unit and on an upstream side of the cold air supply unit in an inner wall surface of the treatment chamber; and the heat treatment apparatus has a cross-section plane, which is perpendicular to a center axis of the treatment chamber and situated at the region where the protrusion is provided, and Dmin and Dmax satisfy the following relation 0.50?Dmin/Dmax<1.Type: ApplicationFiled: June 7, 2012Publication date: May 22, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Kohji Takenaka, Yuichi Mizo, Hironori Minagawa, Takakuni Kobori, Takeshi Ohtsu, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita
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Publication number: 20140120468Abstract: A production apparatus that does not generate coalesced particles and can reduce a generation frequency of a product having a high circularity by a uniform treatment even if the throughput is increased is provided.Type: ApplicationFiled: June 11, 2012Publication date: May 1, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Yuichi Mizo, Hironori Minagawa, Takakuni Kobori, Kohji Takenaka, Takeshi Ohtsu, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita
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Publication number: 20140101966Abstract: Provided is an apparatus for heat treatment capable of heat-treating toner particles efficiently and uniformly while suppressing increase of coarse particles due to coalescence, to thereby enable stable toner production. The apparatus for heat-treating powder particles each of which contains a binder resin and a colorant includes: a cylindrical treatment chamber in which the powder particles are heat-treated; a columnar member (6) provided so as to protrude from a lower end part of the treatment chamber toward an upper end part thereof; a powder particle supply unit (2) for supplying the powder particles to the treatment chamber; a hot air supply unit (3) for heat-treating the supplied powder particles; and a collection unit (5) for collecting the heat-treated powder particles discharged outside the treatment chamber through a toner discharge port provided on the lower end part side of the treatment chamber.Type: ApplicationFiled: June 7, 2012Publication date: April 17, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Hironori Minagawa, Yuichi Mizo, Takeshi Ohtsu, Takakuni Kobori, Kohji Takenaka, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita, Yasumori Kanai
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Publication number: 20140096409Abstract: A heat treating apparatus for powder particles including a cylindrical treating chamber; a powder particle-supplying unit; a hot air-supplying unit that supplies hot air for heat-treating powder particles; a cold air-supplying unit that supplies cold air for cooling the heat-treated powder particles; a regulating unit for regulating a flow of the supplied powder particles; and a recovering unit that recovers the heat-treated powder particles. The regulating unit is a substantially circular columnar member, the hot air-supplying unit has an outlet opposite to the upper end portion of the columnar member, and the regulating unit is equipped with a substantially conic distributing member for distributing the supplied hot air in a circumferential direction and a rotating member for rotating the distributed hot air in a spiral manner, on the center of the upper end portion.Type: ApplicationFiled: June 11, 2012Publication date: April 10, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Takeshi Ohtsu, Yuichi Mizo, Hironori Minagawa, Takakuni Kobori, Kohji Takenaka, Junichi Hagiwara, Daisuke Ito, Kunihiko Kawakita