Patents by Inventor Saburou Hiraoka
Saburou Hiraoka 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: 8507169Abstract: A two-component developer is disclosed, composing a toner comprising parent toner particles with an attached external additive and a carrier provided with a resin covering layer on a surface of a core particle, wherein the resin covering layer comprises a binder resin comprising an acrylic resin and when the resin covering layer is divided in half to a core particle side and a surface side, a nitrogen element content of the core particle side is larger than a nitrogen element content of the surface side.Type: GrantFiled: February 28, 2012Date of Patent: August 13, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventors: Tomoko Mine, Mikihiko Sukeno, Tatsuya Nagase, Tomomi Oshiba, Hiroyuki Kozuru, Saburou Hiraoka, Yoshiyasu Matsumoto, Kosuke Nakamura, Hitomi Motani, Takanari Kayamori
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Patent number: 8497059Abstract: A method of producing a toner comprising toner particles containing a binder resin composed of a non-crystalline polyester resin having a crosslinked structure and a crystalline polyester resin is disclosed, the method comparing steps of; a process to form an oil phase liquid by dissolving or dispersing a non-crystalline polyester resin having a polymerizable unsaturated double bond and a crystalline polyester resin in an organic solvent, a process to form an aqueous dispersion liquid of oil droplets of the oil phase liquid by dispersing the oil phase liquid in an aqueous medium, a process to form oil droplets containing the non-crystalline polyester resin having a crosslinked structure by adding a radical polymerization initiator to the aqueous dispersion liquid of oil droplets, and an organic solvent removing process to form toner particles by removing organic solvent.Type: GrantFiled: September 8, 2011Date of Patent: July 30, 2013Assignee: Konica Minolta Business Technologies, Inc.Inventors: Tomomi Oshiba, Mikihiko Sukeno, Hajime Tadokoro, Ken Ohmura, Tatsuya Nagase, Kenji Hayashi, Saburou Hiraoka, Tomoko Mine
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Publication number: 20130137029Abstract: Disclosed are a toner for electrostatic image development which is able to realize enough charge stability over a long period of time as deterioration of a toner due to mechanical stress is prevented in a developing unit, and to prevent generation of filming, and an image forming method using the same. The toner for electrostatic image development contains toner particles and an external additive. The external additive includes silica fine particles whose surface is covered with a number of projections, and a number average particle diameter of the silica fine particles is 80 to 200 nm. The external additive may include small-diameter fine particles for external additive having a number average particle diameter of 5 to 45 nm.Type: ApplicationFiled: November 28, 2012Publication date: May 30, 2013Inventors: Futoshi KADONOME, Yasuhiko MURAMATSU, Saburou HIRAOKA
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Publication number: 20120328980Abstract: The toner for electrostatic image development has excellent charge properties, by which excellent toner particle size-controlling ability is achieved, and moreover the sharpening of a particle size distribution is achieved. The toner is composed of toner particles containing a binder resin. The process has an aggregating step of adding an aggregating agent containing a transition element into an aqueous medium of dispersed fine binder resin particles to aggregate the fine binder resin particles, and an aggregation-stopping step of adding an aggregation stopper composed on a sulfur atom-containing compound exhibiting a reducing action on the aggregating agent. The aggregating agent is a salt of a bivalent or higher metal selected from Sr, Ti, V, Cr, Mn, Fe, Co, Ni and Cu.Type: ApplicationFiled: June 18, 2012Publication date: December 27, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Saburou HIRAOKA, Tomomi OSHIBA, Mikihiko SUKENO, Tomoko MINE, Hitomi MOTANI, Tatsuya NAGASE, Ken OHMURA
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Publication number: 20120270149Abstract: Disclosed is a production process of a toner for electrostatic image development, by which excellent toner particle size-controlling ability and moreover the sharpening of a particle size distribution are achieved. The production process is a production process of a toner for electrostatic image development, which is composed of toner particles containing at least a binder resin. The process has an aggregating and fusion-bonding step of adding a aggregating agent containing polysilicato-iron into an aqueous medium in which fine binder resin particles formed of the binder resin have been dispersed, thereby aggregating the fine binder resin particles, and an aggregation stopper-adding step of adding an aggregation stopper composed of a polyvalent organic acid or a salt thereof. In the production process of the toner for electrostatic image development, the polyvalent organic acid or the salt thereof is preferably an amino acid or a salt thereof.Type: ApplicationFiled: April 18, 2012Publication date: October 25, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Tomoko MINE, Saburou HIRAOKA, Tomomi OSHIBA, Tatsuya NAGASE
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Publication number: 20120264050Abstract: Disclosed is a production process of a toner for electrostatic image development, by which excellent toner particle size-controlling ability is achieved, and moreover the sharpening of a particle size distribution is achieved. The production process is a production process of a toner for electrostatic image development, is composed of toner particles containing a binder resin. The process has the steps of adding a aggregating agent containing polysilicato-iron into an aqueous medium in which fine binder resin particles formed of the binder resin have been dispersed, thereby aggregating the fine binder resin particles, and adding an aggregation stopper composed of a salt whose cation is univalent or bivalent.Type: ApplicationFiled: April 12, 2012Publication date: October 18, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Tomomi OSHIBA, Hitomi MOTANI, Tomoko MINE, Saburou HIRAOKA, Mikihiko SUKENO, Tatsuya NAGASE, Ken OHMURA
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Publication number: 20120225379Abstract: A two-component developer is disclosed, composing a toner comprising parent toner particles with an attached external additive and a carrier provided with a resin covering layer on a surface of a core particle, wherein the resin covering layer comprises a binder resin comprising an acrylic resin and when the resin covering layer is divided in half to a core particle side and a surface side, a nitrogen element content of the core particle side is larger than a nitrogen element content of the surface side.Type: ApplicationFiled: February 28, 2012Publication date: September 6, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Tomoko MINE, Mikihiko SUKENO, Tatsuya NAGASE, Tomomi OSHIBA, Hiroyuki KOZURU, Saburou HIRAOKA, Yoshiyasu MATSUMOTO, Kosuke NAKAMURA, Hitomi MOTANI, Takanari KAYAMORI
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Publication number: 20120107741Abstract: Provided is a method of manufacturing toner by which the toner capable of forming high quality images and reproducing high density gradation, which exhibits an excellent high-temperature offsetting property together with excellent low-temperature fixability, and provides appropriate gloss with respect to images to be formed, can be stably prepared; and also provided is the toner. After conducting a step in which particles made of at least a crystalline polyester resin are coagulated to form core coagulated particles, and an unsaturated amorphous polyester resin particle is attached onto the surface of each of the core coagulated particles to form core-shell type coagulated particles, radical polymerization reaction is conducted by acting a radical polymerization initiator on the foregoing core-shell type coagulated particles to conduct a step in which a layer made of a crosslinking amorphous polyester resin is formed on the surface of each of the core coagulated particles.Type: ApplicationFiled: October 26, 2011Publication date: May 3, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Saburou HIRAOKA, Mikihiko SUKENO, Hajime TADOKORO, Ken OHMURA, Tatsuya NAGASE, Tomomi OSHIBA, Kenji HAYASHI, Tomoko MINE
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Publication number: 20120100478Abstract: A method of producing an electrostatic image developing toner comprising toner particles comprising a binder resin containing at least a non-crystalline polyester resin having a crosslinking structure and a crystalline polyester resin, the method comprising the steps of (a-1) preparing a crystalline polyester resin particle aqueous dispersion liquid; (a-2) preparing a polymerizable unsaturated non-crystalline polyester resin aqueous dispersion liquid; (b) preparing crosslinking non-crystalline polyester resin particles by adding a radical polymerization initiator to the aqueous dispersion liquid of particles containing the non-crystalline polyester resin having a polymerizable unsaturated bond; (c) preparing core particles by aggregating at least the particles containing the crystalline polyester resin in an aqueous medium; and (d) preparing a shell layer containing the non-crystalline polyester resin having a crosslinking structure by fusing the particles containing the non-crystalline polyester resin havingType: ApplicationFiled: October 13, 2011Publication date: April 26, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Mikihiko SUKENO, Hajime TADOKORO, Ken OHMURA, Tatsuya NAGASE, Tomomi OSHIBA, Kenji HAYASHI, Saburou HIRAOKA, Tomoko MINE
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Publication number: 20120094229Abstract: A toner comprising toner particles containing a binder resin comprising a crystalline polyester resin, a non-crystalline polyester resin and an acryl resin having a cross-link structure, and the acryl resin having a cross-link structure has a cross-link site derived from a crosslinking agent represented by the following formula (1): CH2?CR1—C(?O)O—Z—OC(?O)—CR2?CH2??Formula (1) wherein R1 and R2 are each a hydrogen atom or an alkyl group of 1 to 3 carbon atoms, and Z is a hydrocarbon group of 2 to 90 carbon atoms, provided that the hydrocarbon group may include an ether linkage, an ester linkage, a heterocyclic ring or a substituent.Type: ApplicationFiled: October 12, 2011Publication date: April 19, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Tomoko MINE, Mikihiko SUKENO, Hajime TADOKORO, Ken OHMURA, Tatsuya NAGASE, Tomomi OSHIBA, Saburou HIRAOKA
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Publication number: 20120064454Abstract: A method of producing a toner comprising toner particles containing a binder resin composed of a non-crystalline polyester resin having a crosslinking structure and a crystalline polyester resin is disclosed, the method comparing steps of; a process to form an oil phase liquid by dissolving or dispersing a non-crystalline polyester resin having a polymerizable unsaturated double bond and a crystalline polyester resin in an organic solvent, a process to form an aqueous dispersion liquid of oil droplets of the oil phase liquid by dispersing the oil phase liquid in an aqueous medium, a process to form oil droplets containing the non-crystalline polyester resin having a crosslinking structure by adding a radical polymerization initiator to the aqueous dispersion liquid of oil droplets, and an organic solvent removing process to form toner particles by removing organic solvent.Type: ApplicationFiled: September 8, 2011Publication date: March 15, 2012Applicant: KONICA MINOLTA BUSINESS TECHNOLOGIES, INC.Inventors: Tomomi OSHIBA, Mikihiko SUKENO, Hajime TADOKORO, Ken OHMURA, Tatsuya NAGASE, Kenji HAYASHI, Saburou HIRAOKA, Tomoko MINE
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Patent number: 7285376Abstract: Disclosed are a process of correcting a planographic printing plate with an image, and a correction solution for correcting the planographic printing plate; the process comprising the steps of scraping stains at the non-image portions or undesired images at the image portions in the planographic printing plate off, and then covering the scraped portions with hydrophilic film.Type: GrantFiled: September 28, 2004Date of Patent: October 23, 2007Assignee: Konica Minolta Medical & Graphic Inc.Inventor: Saburou Hiraoka
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Patent number: 7163779Abstract: Disclosed is a process of manufacturing a planographic printing plate from a planographic printing plate material comprising a support and provided thereon, at least one of an image formation layer and an ablation layer, the process comprising the steps of imagewise exposing the planographic printing plate material, and developing the exposed planographic printing plate material by supplying printing ink containing at least one of a polymerizable monomer and a polymerizable oligomer to the exposed planographic printing plate material.Type: GrantFiled: December 2, 2004Date of Patent: January 16, 2007Assignee: Konica Minolta Medical & Graphic, Inc.Inventor: Saburou Hiraoka
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Patent number: 7086333Abstract: Disclosed are a printing plate material capable of being folded by heating, a printing process employing the printing plate material and a process of folding the printing plate material, the printing plate material comprising a support and provided thereon, an image formation layer, the support being a polyester sheet with a thickness dispersion of not more then 10%.Type: GrantFiled: February 5, 2004Date of Patent: August 8, 2006Assignee: Konica Minolta HoldingsInventors: Takeshi Sampei, Saburou Hiraoka
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Publication number: 20060115769Abstract: Provided is a correction solution accompanied with an image correction process used for a planographic printing plate, exhibiting an anti-stain property against fluctuation in printing conditions (such as change in ambient temperature, and so forth), in which not only stains on a printing plate surface can simply be removed stably, but also image portions can simply be corrected stably in a plate-making process. Also disclosed is a correction solution used for a planographic printing plate, containing a hydrophilic resin and/or hydrophilic particles, wherein the correction solution further contains solid particles having an average particle diameter of 0.5-5 ?m.Type: ApplicationFiled: November 22, 2005Publication date: June 1, 2006Inventor: Saburou Hiraoka
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Patent number: 6994028Abstract: Disclosed is a developing process on a press of a planographic printing plate material comprising a hydrophilic layer and an image formation layer, which is capable of being developed with water or capable of being developed on a press, the process comprising the steps of (a) supplying dampening water to the planographic printing plate material with a recorded image mounted on a plate cylinder of a press by bringing a dampening roller into contact with the planographic printing plate material while rotating the plate cylinder, and (b) then supplying ink to the planographic printing plate material by bringing an ink roller into contact with the planographic printing plate material to remove an image formation layer unnecessary for printing, wherein in the step (a), the supplied amount of the dampening water is varied.Type: GrantFiled: March 24, 2004Date of Patent: February 7, 2006Assignee: Konica Minolta Medical & Graphic, Inc.Inventor: Saburou Hiraoka
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Publication number: 20050130065Abstract: Disclosed is a process of manufacturing a planographic printing plate from a planographic printing plate material comprising a support and provided thereon, at least one of an image formation layer and an ablation layer, the process comprising the steps of imagewise exposing the planographic printing plate material, and developing the exposed planographic printing plate material by supplying printing ink containing at least one of a polymerizable monomer and a polymerizable oligomer to the exposed planographic printing plate material.Type: ApplicationFiled: December 2, 2004Publication date: June 16, 2005Inventor: Saburou Hiraoka
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Publication number: 20050074696Abstract: Disclosed are a process of correcting a planographic printing plate with an image, and a correction solution for correcting the planographic printing plate; the process comprising the steps of scraping stains at the non-image portions or undesired images at the image portions in the planographic printing plate off, and then covering the scraped portions with hydrophilic film.Type: ApplicationFiled: September 28, 2004Publication date: April 7, 2005Applicant: Konica Minolta Medical & Graphic, Inc.Inventor: Saburou Hiraoka
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Publication number: 20040206261Abstract: Disclosed is a developing process on a press of a planographic printing plate material comprising a hydrophilic layer and an image formation layer, which is capable of being developed with water or capable of being developed on a press, the process comprising the steps of (a) supplying dampening water to the planographic printing plate material with a recorded image mounted on a plate cylinder of a press by bringing a dampening roller into contact with the planographic printing plate material while rotating the plate cylinder, and (b) then supplying ink to the planographic printing plate material by bringing an ink roller into contact with the planographic printing plate material to remove an image formation layer unnecessary for printing, wherein in the step (a), the supplied amount of the dampening water is varied.Type: ApplicationFiled: March 24, 2004Publication date: October 21, 2004Applicant: KONICA MINOLTA MEDICAL & GRAPHIC, INC.Inventor: Saburou Hiraoka
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Publication number: 20040168598Abstract: Disclosed are a printing plate material capable of being folded by heating, a printing process employing the printing plate material and a process of folding the printing plate material, the printing plate material comprising a support and provided thereon, an image formation layer, the support being a polyester sheet with a thickness dispersion of not more then 10%.Type: ApplicationFiled: February 5, 2004Publication date: September 2, 2004Applicant: Konica Minolta Holdings, Inc.Inventors: Takeshi Sampei, Saburou Hiraoka