Patents by Inventor Yushi Mikuriya
Yushi Mikuriya 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: 7029813Abstract: In a toner having toner particles containing at least a colorant, a release agent and a polar resin, and an inorganic fine powder, the polar resin contains a polyester resin obtained by carrying out polymerization in the presence of a titanium chelate compound as a catalyst, and has an acid value in a specific range. The toner particles are granulated in an aqueous medium and have a weight-average particle diameter in a specific range.Type: GrantFiled: November 21, 2003Date of Patent: April 18, 2006Assignee: Canon Kabushiki KaishaInventors: Yushi Mikuriya, Yasushi Katsuta, Keiji Komoto, Takeshi Kaburagi, Emi Tosaka
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Patent number: 7029809Abstract: In a toner kit having i) a non-magnetic black toner having at least carbon black and ii) color toners, the black toner has a weight-average particle diameter represented by D4b and a one-point method BET specific surface area represented by Sb, and the color toners, other than the black toner, each have a weight-average particle diameter represented by D4c and a one-point method BET specific surface area represented by Sc, where the black toner and color toners satisfy the following relations (1) and (2): 0.60?D4c/D4b?0.96,??Relation (1) 0.750?Sc/Sb?1.000;??Relation (2) and each have an average circularity of from 0.950 to 1.000 and a circularity standard deviation of less than 0.040 as measured with a flow type particle image analyzer.Type: GrantFiled: October 1, 2003Date of Patent: April 18, 2006Assignee: Canon Kabushiki KaishaInventors: Katsuyuki Nonaka, Yushi Mikuriya, Shinya Yachi, Shuntaro Watanabe
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Publication number: 20060063082Abstract: In a toner having toner particles which comprise toner base particles containing at least a colorant, a release agent and a polar resin, and an inorganic fine powder, the polar resin is a resin having at least a polyester unit, synthesized in the presence of an aromatic carboxylic acid titanium compound used as a catalyst, and has an acid value of from 3 mgKOH/g to 35 mgKOH/g. The toner base particles are obtained by carrying out granulation in an aqueous medium, and the toner has a weight-average particle diameter of from 4.0 ?m to 10.0 ?m.Type: ApplicationFiled: June 22, 2005Publication date: March 23, 2006Applicant: CANON KABUSHIKI KAISHAInventors: Yushi Mikuriya, Satoshi Handa, Yuji Moriki, Yasushi Katsuta, Emi Tosaka
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Patent number: 7014969Abstract: The present invention provides a silica fine particle capable of preventing a charging member or an image bearing member from being contaminated with toner when the toner contains the particle and also capable of providing the toner with a stable developing property. The silica fine particle of the present invention has been hydrophobic treated. Furthermore, the particle has a peak in a range of 0.04 ?m to 1 ?m and a peak in the range of 1 ?m to 100 ?m in a volume-basis particle diameter distribution. The particle has a frequency ratio of 10 to 80% for the particles with a particle diameter of 0.04 ?m to 1 ?m to a total of all the peaks, and the particles has the frequency ratio of less than 16% for the particles with a particle diameters of 20 ?m to 2000 ?m to the total of all the peaks.Type: GrantFiled: October 2, 2003Date of Patent: March 21, 2006Assignee: Canon Kabushiki KaishaInventors: Shinya Yachi, Yushi Mikuriya, Katsuyuki Nonaka, Shuntaro Watanabe
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Publication number: 20050238984Abstract: In a process for producing toner particles by dispersing in an aqueous medium a polymerizable monomer composition containing at least a polymerizable monomer and a colorant and carrying out polymerization by the use of a polymerization initiator, the concentration of alcohol having 4 to 6 carbon atoms in the aqueous medium is so adjusted as to be from 500 ppm to 2,000 ppm when the polymerization conversion of the polymerizable monomer composition is 30%, and to be from 2,300 ppm to 10,000 ppm when the polymerization conversion of the polymerizable monomer composition is 97%.Type: ApplicationFiled: April 11, 2005Publication date: October 27, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Takeshi Kaburagi, Yushi Mikuriya, Keiji Komoto, Yasushi Katsuta, Kenichi Nakayama
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Patent number: 6936394Abstract: An electrostatic latent image on an image-bearing member is developed with a two-component developer comprising a toner and a carrier stored in a developer vessel while supplying as required a replenishing developer to the developer vessel. The replenishing developer comprises 1 wt. part of a carrier and 2-50 wt. parts of a toner, wherein the carrier is a magnetic fine particle-dispersed resin carrier comprising at least inorganic compound particles and a carrier binder resin, and the toner has a weight-average particle size of 3 to 10 ?m and contains 1 to 40 wt. % of solid wax.Type: GrantFiled: February 25, 2002Date of Patent: August 30, 2005Assignee: Canon Kabushiki KaishaInventors: Kenji Okado, Yushi Mikuriya, Kazumi Yoshizaki, Naotaka Ikeda
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Patent number: 6855469Abstract: In a full-color image-forming method having at least a charging step, a latent-image-forming step, a developing step of developing an electrostatic latent image by the use of a developer; a transfer step, and a fixing step, the developer comprises a plurality of color developers and a black developer. The color developers are each a two-component developer for full-color image formation which has i) a color toner having color toner particles containing at least a binder resin, a colorant and a wax and ii) a carrier for the color developer. The black developer is a two-component developer for full-color image formation which has i) a black toner having black toner particles containing at least a binder resin, carbon black and a wax and ii) a carrier for the black developer. The carrier for the black developer has a larger absolute value of charge quantity when the same toner is used, than the respective carriers for the color developers.Type: GrantFiled: October 22, 2002Date of Patent: February 15, 2005Assignee: Canon Kabushiki KaishaInventors: Naotaka Ikeda, Kenji Okado, Yushi Mikuriya, Shinya Yachi, Kazumi Yoshizaki, Katsuyuki Nonaka
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Publication number: 20050026062Abstract: In a non-magnetic toner having non-magnetic toner particles containing at least a binder resin and a colorant, and an inorganic fine powder, the non-magnetic toner particles contain at least one ether compound having a specific structure, and the ether compound is in a content of from 5 ppm to 1,000 ppm.Type: ApplicationFiled: January 27, 2004Publication date: February 3, 2005Inventors: Keiji Komoto, Yushi Mikuriya, Yuji Moriki, Yasushi Katsuta, Kenichi Nakayama, Takeshi Kaburagi, Emi Tosaka, Yasuhiro Hashimoto
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Publication number: 20050026061Abstract: In a toner having toner particles containing at least a colorant, a release agent and a polar resin, and an inorganic fine powder, the polar resin contains a polyester resin obtained by carrying out polymerization in the presence of a titanium chelate compound as a catalyst, and has an acid value in a specific range. The toner particles are granulated in an aqueous medium and have a weight-average particle diameter in a specific range.Type: ApplicationFiled: November 21, 2003Publication date: February 3, 2005Inventors: Yushi Mikuriya, Yasushi Katsuta, Keiji Komoto, Takeshi Kaburagi, Emi Tosaka
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Publication number: 20050026063Abstract: A toner includes toner particles and an inorganic fine powder mixed with the toner particles. The toner particles contain a binder resin, a coloring agent, a releasing agent, and a sulfur-containing resin. The toner particles contain at least one element selected from the group consisting of magnesium, calcium, barium, zinc, aluminum, and phosphorus and satisfy the relationship: 4?T/S?30 wherein T represents the total content of the element in ppm, and S represents the content of sulfur in ppm. The weight-average particle diameter (D4) of the toner is in the range of 3 to 10 ?m. The average circularity of the toner is within the range of 0.950 to 0.995.Type: ApplicationFiled: March 25, 2004Publication date: February 3, 2005Inventors: Keiji Komoto, Yasushi Katsuta, Yushi Mikuriya, Takeshi Kaburagi, Emi Tosaka
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Publication number: 20050026055Abstract: A toner includes toner particles containing at least a binder resin and a colorant, and inorganic fine particles. The shape factor SF-1 of the toner particles is in a specific range. The toner has a storage elastic modulus at 140° C., G? (140° C.), in a specific range the toner comes to have a viscosity of 1.0×103 Pa·s according to a flow tester heating method at a temperature of from 115° C. or more to less than 130° C.Type: ApplicationFiled: June 25, 2004Publication date: February 3, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Yuji Moriki, Shinya Yachi, Yushi Mikuriya, Keiji Komoto, Kenichi Nakayama, Takeshi Kaburagi, Emi Tosaka
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Publication number: 20040191665Abstract: To provide an method for forming an image capable of effectively suppressing a toner from deteriorating and also capable of keeping the quality of an image for a long period of time, even when the method is applied to an apparatus with as high process speed.Type: ApplicationFiled: January 7, 2004Publication date: September 30, 2004Inventors: Shuntaro Watanabe, Yushi Mikuriya, Takeshi Yamamoto, Shinya Yachi, Katsuyuki Nonaka
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Patent number: 6783910Abstract: A toner for electrostatic imaging has a vinyl resin binder with an acid value of 2.5-70 mgKOH/g and (i) a long-chain alcohol with an OH value of 10-120 mg/KOH/g or (ii) a long-chain alkyl carboxylic acid with an acid value of 5-120 mg/KOH/g, wherein the acid value of the resin binder+either (i) OH value of the alcohol or (ii) acid value of the acid>(¼)×OH value of the binder.Type: GrantFiled: December 12, 2002Date of Patent: August 31, 2004Assignee: Canon Kabushiki KaishaInventors: Takaaki Kohtaki, Makoto Unno, Yushi Mikuriya, Tadashi Doujo
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Publication number: 20040115542Abstract: In a toner kit having i) a non-magnetic black toner having at least carbon black and ii) color toners, the black toner has a weight-average particle diameter represented by D4b and a one-point method BET specific surface area represented by Sb, and the color toners, other than the black toner, each have a weight-average particle diameter represented by D4c and a one-point method BET specific surface area represented by Sc, where the black toner and color toners satisfy the following relations (1) and (2):Type: ApplicationFiled: October 1, 2003Publication date: June 17, 2004Inventors: Katsuyuki Nonaka, Yushi Mikuriya, Shinya Yachi, Shuntaro Watanabe
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Publication number: 20040110077Abstract: The present invention provides a silica fine particle capable of preventing a charging member or an image bearing member from being contaminated with toner when the toner contains the particle and also capable of providing the toner with a stable developing property. The silica fine particle of the present invention has been hydrophobic treated. Furthermore, the particle has a peak in a range of 0.04 &mgr;m to 1 &mgr;m and a peak in the range of 1 &mgr;m to 100 &mgr;m in a volume-basis particle diameter distribution. The particle has a frequency ratio of 10 to 80% for the particles with a particle diameter of 0.04 &mgr;m to 1 &mgr;m to a total of all the peaks, and the particles has the frequency ratio of less than 16% for the particles with a particle diameters of 20 &mgr;m to 2000 &mgr;m to the total of all the peaks.Type: ApplicationFiled: October 2, 2003Publication date: June 10, 2004Inventors: Shinya Yachi, Yushi Mikuriya, Katsuyuki Nonaka, Shuntaro Watanabe
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Publication number: 20030211414Abstract: A toner for electrostatic imaging has a vinyl resin binder with an acid value of 2.5-70 mgKOH/g and (i) a long-chain alcohol with an OH value of 10-120 mg/KOH/g or (ii) a long-chain alkyl carboxylic acid with an acid value of 5-120 mg/KOH/g, wherein the acid value of the resin binder+either (i) OH value of the alcohol or (ii) acid value of the acid>(¼)×OH value of the binder.Type: ApplicationFiled: December 12, 2002Publication date: November 13, 2003Inventors: Takaaki Kohtaki, Makoto Unno, Yushi Mikuriya, Tadashi Doujo
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Patent number: 6632577Abstract: An image forming method including forming an electrostatic latent image on an electrostatic latent image bearing member; developing said electrostatic latent image employing a toner to form a toner image; transferring the toner image to a recording medium; cleaning the electrostatic latent image bearing member with a contact cleaner to collect untransferred toner as waste toner thereon and fixing the toner image transferred to the recording medium, wherein said waste toner after collection is reused in a subsequent developing step as a mixed toner comprising said collected waste toner and toner not yet used for developing the electrostatic latent image, wherein said toner comprises a binder resin, a colorant and a release agent, said binder resin having at least one peak in the region of a molecular weight from 2,000 to 50,000 and at least a peak or shoulder in the region of a molecular weight of not less than 100,000 in molecular weight distribution as measured by gel permeation chromatography, and said releType: GrantFiled: August 30, 1995Date of Patent: October 14, 2003Assignee: Canon Kabushiki KaishaInventors: Yasutaka Akashi, Yushi Mikuriya
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Patent number: 6623901Abstract: A toner for developing an electrostatic image is constituted by a binder resin and a long-chain compound. The binder resin is a polyester resin or vinyl resin respectively having an acid value of preferably 25-70 mgKOH/g. The long-chain compound is a long-chain alkyl alcohol having an OH value of 10-120 mgKOH/g or a long-chain alkyl carboxylic acid having an acid value of 5-120 mgKOH/g and is contained so as to satisfy a condition of the following formula (1) or formula (2): Formula (1) acid value of binder resin +OH value of long-chain alkyl alcohol >(¼)×OH value of binder resin, or Formula (2) acid value of binder resin +acid value of long-chain alkyl carboxylic acid >(¼)×OH value of binder resin. The toner is characterized by a good balance between fixing performances and developing performances suitable for a variety of models of image forming apparatus and in wide ranges of environmental conditions.Type: GrantFiled: December 18, 1997Date of Patent: September 23, 2003Assignee: Canon Kabushiki KaishaInventors: Takaaki Kohtaki, Makoto Unno, Yushi Mikuriya, Tadashi Doujo
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Publication number: 20030122918Abstract: In a full-color image-forming method having at least a charging step, a latent-image-forming step, a developing step of developing an electrostatic latent image by the use of a developer; a transfer step, and a fixing step, the developer comprises a plurality of color developers and a black developer. The color developers are each a two-component developer for full-color image formation which has i) a color toner having color toner particles containing at least a binder resin, a colorant and a wax and ii) a carrier for the color developer. The black developer is a two-component developer for full-color image formation which has i) a black toner having black toner particles containing at least a binder resin, carbon black and a wax and ii) a carrier for the black developer. The carrier for the black developer has a larger absolute value of charge quantity when the same toner is used, than the respective carriers for the color developers.Type: ApplicationFiled: October 22, 2002Publication date: July 3, 2003Applicant: Canon Kabushiki KaishaInventors: Naotaka Ikeda, Kenji Okado, Yushi Mikuriya, Shinya Yachi, Kazumi Yoshizaki, Katsuyuki Nonaka
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Publication number: 20030091922Abstract: An electrostatic latent image on an image-bearing member is developed with a two-component developer comprising a toner and a carrier stored in a developer vessel while supplying as required a replenishing developer to the developer vessel. The replenishing developer comprises 1 wt. part of a carrier and 2-50 wt. parts of a toner, wherein the carrier is a magnetic fine particle-dispersed resin carrier comprising at least inorganic compound particles and a carrier binder resin, and the toner has a weight-average particle size of 3 to 10 &mgr;m and contains 1 to 40 wt. % of solid wax.Type: ApplicationFiled: February 25, 2002Publication date: May 15, 2003Inventors: Kenji Okado, Yushi Mikuriya, Kazumi Yoshizaki, Naotaka Ikeda