Patents by Inventor Nozomu Komatsu
Nozomu Komatsu 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: 9594323Abstract: A toner having toner particles, each of which contains a binder resin, a wax and inorganic fine particles, wherein the inorganic fine particles are fixed at the surface of the toner particles as a result of a surface treatment by hot air, and the degree of uneven distribution of wax in the toner is controlled in a depth direction of the toner, from the toner surface towards a toner central portion.Type: GrantFiled: January 25, 2016Date of Patent: March 14, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Kosuke Fukudome, Yoshiaki Shiotari, Takayuki Itakura
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Publication number: 20160363878Abstract: A toner comprising a toner particle containing an amorphous polyester resin, a crystalline polyester resin and a wax, wherein in a cross-section of the toner by transmission electron microscopy (TEM), domains of the wax and crystals of the crystalline polyester resin are present, the area occupied by the domains of the wax is 0.5% to 8.0% and the area occupied by the crystals of the crystalline polyester resin is 0.5% to 8.0% of the cross-sectional area of the toner, the number-average diameter Dw of the domains of the wax is 60 nm to 240 nm, the aspect ratio of the crystals of the crystalline polyester resin is 5.0 to 25.0, and the number-average diameter Dc of major axis lengths of the crystals of the crystalline polyester resin is 0.8 to 2.0 times the Dw.Type: ApplicationFiled: June 10, 2016Publication date: December 15, 2016Inventors: Masayuki Hama, Ichiro Kanno, Takeshi Hashimoto, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa
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Publication number: 20160363877Abstract: A toner comprising a toner particle containing a crystalline polyester resin and an amorphous polyester resin, wherein, in a cross-sectional observation of the toner by transmission electron microscopy (TEM), the number-average diameter (D1) of major axis lengths of the crystalline polyester resin dispersed up to a depth of 0.30 ?m from a toner surface is 40 nm to 110 nm, and the number-average diameter (D1) of major axis lengths of the crystalline polyester resin dispersed deeper than 0.30 ?m from the toner surface is 1.25 to 4.00 times the number-average diameter (D1) of the major axis lengths of the crystalline polyester resin dispersed up to a depth of 0.30 ?m from the toner surface.Type: ApplicationFiled: June 8, 2016Publication date: December 15, 2016Inventors: Masayuki Hama, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Nozomu Komatsu, Takakuni Kobori, 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: 9348253Abstract: The present invention is an image-forming method in which, when ?(A) is the contact angle relative to water of a surface of a photosensitive member and ?(B) is the contact angle relative to water of a surface of an intermediate transfer member, ?(B) is from 100° to 150°; ?(A) and ?(B) satisfy ?70°??(A)??(B)<0°; the toner has a toner particle that contains a binder resin; and the contact angle relative to water of a surface of a pellet molding of the toner is from 60° to 80°.Type: GrantFiled: October 9, 2015Date of Patent: May 24, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Ichiro Kanno, Takeshi Hashimoto, Hideki Kaneko, Masayuki Hama, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa
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Publication number: 20160139523Abstract: A toner having toner particles, each of which contains a binder resin, a wax and inorganic fine particles, wherein the inorganic fine particles are fixed at the surface of the toner particles as a result of a surface treatment by hot air, and the degree of uneven distribution of wax in the toner is controlled in a depth direction of the toner, from the toner surface towards a toner central portion.Type: ApplicationFiled: January 25, 2016Publication date: May 19, 2016Inventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Kosuke Fukudome, Yoshiaki Shiotari, Takayuki Itakura
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Publication number: 20160109820Abstract: Provided is a toner that has excellent low-temperature fixability, hot offset resistance, high image glossiness and fixing wraparound resistance, as well as high durable stability. The toner includes toner particles that contain a binder resin, a colorant and a wax, and fine inorganic particles on a surface of the toner particles, wherein the binder resin contains a polyester resin A and a styrene resin B, and a content ratio A/B of the polyester resin A and the styrene resin B is 85/15 or more and 98/2 or less based on mass, the styrene resin B has a weight average molecular weight Mw of a tetrahydrofuran soluble component of 2,000 or more and 5,000 or less, and the toner has been subjected to a hot-air surface treatment.Type: ApplicationFiled: December 21, 2015Publication date: April 21, 2016Inventors: Takeshi Hashimoto, Hiroyuki Fujikawa, Nozomu Komatsu, Hideki Kaneko, Yosuke Iwasaki, Ichiro Kanno
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Publication number: 20160103401Abstract: The present invention is an image-forming method in which, when ?(A) is the contact angle relative to water of a surface of a photosensitive member and ?(B) is the contact angle relative to water of a surface of an intermediate transfer member, ?(B) is from 100° to 150°; ?(A) and ?(B) satisfy ?70°??(A)-?(B)<0°; the toner has a toner particle that contains a binder resin; and the contact angle relative to water of a surface of a pellet molding of the toner is from 60° to 80°.Type: ApplicationFiled: October 9, 2015Publication date: April 14, 2016Inventors: Ichiro Kanno, Takeshi Hashimoto, Hideki Kaneko, Masayuki Hama, Nozomu Komatsu, Takakuni Kobori, Hiroyuki Fujikawa
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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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Patent number: 9256148Abstract: A toner having toner particles, each of which contains a binder resin, a wax and inorganic fine particles, wherein the inorganic fine particles are fixed at the surface of the toner particles as a result of a surface treatment by hot air, and the degree of uneven distribution of wax in the toner is controlled in a depth direction of the toner, from the toner surface towards a toner central portion.Type: GrantFiled: November 24, 2011Date of Patent: February 9, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Kosuke Fukudome, Yoshiaki Shiotari, Takayuki Itakura
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Publication number: 20150309443Abstract: Provided is a developer replenishing cartridge excellent in accuracy with which an image forming apparatus is replenished with a developer irrespective of a use environment even when the developer is in a consolidated state. The developer replenishing cartridge includes: a developer replenishing container and a developer, being removably mountable to a developer replenishing apparatus; in which: the developer replenishing container includes a pump portion that operates so that a state where the internal pressure of a developer containing portion is lower than the atmospheric pressure and a state where the pressure is higher than the atmospheric pressure alternately repeatedly switch with each other; and the developer contains toner having a uniaxial collapse stress at a maximum consolidation stress of 10.0 kPa, of 2.5 kPa or more and 3.5 kPa or less.Type: ApplicationFiled: April 24, 2014Publication date: October 29, 2015Inventors: Takakuni Kobori, Nozomu Komatsu, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Yosuke Iwasaki, Hiroyuki Fujikawa
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Patent number: 9152088Abstract: Provided is a developer replenishing cartridge excellent in accuracy with which an image forming apparatus is replenished with a developer irrespective of a use environment even when the developer is in a consolidated state. The developer replenishing cartridge includes: a developer replenishing container and a developer, being removably mountable to a developer replenishing apparatus; in which: the developer replenishing container includes a pump portion that operates so that a state where the internal pressure of a developer containing portion is lower than the atmospheric pressure and a state where the pressure is higher than the atmospheric pressure alternately repeatedly switch with each other; and the developer contains toner having a uniaxial collapse stress at a maximum consolidation stress of 10.0 kPa, of 2.5 kPa or more and 3.5 kPa or less.Type: GrantFiled: April 24, 2014Date of Patent: October 6, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Takakuni Kobori, Nozomu Komatsu, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Yosuke Iwasaki, Hiroyuki Fujikawa
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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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Patent number: 9063443Abstract: The present invention provides a magnetic carrier that can stably impart charge to a toner on a long term basis and that exhibits an excellent toner separation property and thus exhibits an excellent developing performance. This magnetic carrier is a magnetic carrier in which a vinyl resin coats the surface of a resin-filled core in which a resin is filled in pores of a porous ferrite particle, wherein the resistivity, Mg content, and total content of Sr and Ca oxides of the porous ferrite particle exhibit prescribed values and the magnetic carrier has a total area—in the backscattered electron projection image obtained by observation using a scanning electron microscope at an acceleration voltage of 2.0 kV—for a region originating with the porous ferrite particle of from at least 0.2 area % to not more than 5.0 area % with reference to the projected area of the magnetic carrier.Type: GrantFiled: May 23, 2013Date of Patent: June 23, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Koh Ishigami, Kentaro Kamae, Nozomu Komatsu, Yoshinobu Baba
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Patent number: 9058924Abstract: A magnetic carrier having a resin-containing ferrite particles each containing a porous ferrite core and a resin in pores of the porous ferrite core, wherein the porous ferrite core has a particular pore diameter corresponding to the maximum logarithmic differential pore volume in a pore diameter range from at least 0.10 ?m to not more than 3.00 ?m, the resistivity of the porous ferrite core is in a particular range, and the porous ferrite core contains an oxide of Mg in a particular amount and contains a particular amount of a oxide of at least one metal selected from the group consisting of Mn, Sr, and Ca.Type: GrantFiled: May 24, 2013Date of Patent: June 16, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Nozomu Komatsu, Kentaro Kamae, Koh Ishigami, Yoshinobu Baba
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Patent number: 9034549Abstract: A toner is provided that exhibits a satisfactory heat-resistant storability and an excellent low-temperature fixability. The toner has toner particles each of which contains at least a binder resin and a wax, and is characterized in that this toner is obtained by attaching a metal compound to the surface of the toner particle and thereafter performing a surface treatment with a hot air current; the binder resin contains at least a polyester resin; and the metal compound is formed by coordinating or bonding a specific aromatic oxycarboxylic acid to a metal.Type: GrantFiled: December 9, 2011Date of Patent: May 19, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Yoshiaki Shiotari, Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Kosuke Fukudome, Takayuki Itakura
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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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Patent number: 8986914Abstract: An object of the present invention is to improve resistance to wraparound during fixing while achieving both low-temperature fixability and resistance to hot offset. A further object is to suppress image density variations and fogging in white background regions during use at high print coverage rate at high temperature and high humidity. A toner containing inorganic fine particles and toner particles containing a binder resin and a wax being provided, the toner being characterized in that the binder resin contains a polyester resin A obtained by condensation polymerization of a polyvalent carboxylic acid and an alcohol component mainly containing an aromatic diol and a polyester resin B obtained by condensation polymerization of a polyvalent carboxylic acid and an alcohol component mainly containing an aliphatic diol, and in that the degree of segregation of the wax in the toner depth direction from the toner surface toward the toner center is controlled.Type: GrantFiled: September 15, 2011Date of Patent: March 24, 2015Assignee: Canon Kabushiki KaishaInventors: Hiroyuki Fujikawa, Kunihiko Nakamura, Nozomu Komatsu, Yoshiaki Shiotari, Koh Ishigami, Kentaro Kamae, Takayuki Itakura