Patents by Inventor Hidenori Tachi
Hidenori Tachi 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: 8841057Abstract: A resin binder for use in a toner for electrophotography, containing a polycondensation resin obtainable by polycondensing an alcohol component containing an aliphatic polyhydric alcohol having two or more secondary carbon atoms with a hydroxyl group bound thereto (an alcohol A), and a carboxylic acid component, wherein the alcohol A is contained in an amount of from 10 to 100% by mol, of the alcohol component; and a toner for electrophotography containing the resin binder. The toner for electrophotography of the present invention is suitably used in developing latent images formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: October 29, 2008Date of Patent: September 23, 2014Assignee: Kao CorporationInventors: Katsutoshi Aoki, Norihiro Fukuri, Takashi Kubo, Yoshitomo Kimura, Yasunori Inagaki, Yoshihiro Ueno, Hidenori Tachi
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Publication number: 20110212395Abstract: A resin binder for use in a toner for electrophotography, containing a polycondensation resin obtainable by polycondensing an alcohol component containing an aliphatic polyhydric alcohol having two or more secondary carbon atoms with a hydroxyl group bound thereto (an alcohol A), and a carboxylic acid component, wherein the alcohol A is contained in an amount of from 10 to 100% by mol, of the alcohol component; and a toner for electrophotography containing the resin binder. The toner for electrophotography of the present invention is suitably used in developing latent images formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: October 29, 2008Publication date: September 1, 2011Applicant: KAO CORPORATIONInventors: Katsutoshi Aoki, Norihiro Fukuri, Takashi Kubo, Yoshitomo Kimura, Yasunori Inagaki, Yoshihiro Ueno, Hidenori Tachi
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Patent number: 7250242Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: October 7, 2003Date of Patent: July 31, 2007Assignee: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Patent number: 7244536Abstract: A toner comprising a resin binder, a black colorant comprising a composite oxide of two or more metals, and a charge control agent comprising a quaternary ammonium salt. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: May 16, 2002Date of Patent: July 17, 2007Assignee: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima, Yasuyuki Tamane
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Patent number: 7063926Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: October 7, 2003Date of Patent: June 20, 2006Assignee: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Patent number: 7014970Abstract: A resin composition having a softening point of from 80° to 165° C., obtained by reacting a poly C2-4 alkylene terephthalate having a melting point of 200° C. or more with a low-molecular weight polyester having a number-average molecular weight of from 400 to 2500; a resin binder for a toner comprising the above resin composition; a toner comprising the above resin binder; a process for preparing a resin composition having a softening point of from 80° to 165° C., comprising the step of reacting a poly C2-4 alkylene terephthalate having a melting point of 200° C. or more with a low-molecular weight polyester having a number-average molecular weight of from 400 to 2500. The resin composition can be suitably used as a resin binder for a toner used for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing, and the like.Type: GrantFiled: October 17, 2003Date of Patent: March 21, 2006Assignee: Kao CorporationInventors: Eiji Morimoto, Hidenori Tachi, Katsutoshi Aoki
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Patent number: 6946228Abstract: A toner for development of electrostatic latent images, comprising a resin binder comprising a resin having a softening point of from 120° to 170° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of from 5 to 50% by weight; and a resin having a softening point of 90° C. or more and less than 120° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of less than 5% by weight; and at least one low-melting point wax having a melting point of from 60° to 90° C. The toner for development of electrostatic latent images has low lowest fixing temperature and is excellent in the offset resistance, the blocking resistance and the durability.Type: GrantFiled: April 2, 2004Date of Patent: September 20, 2005Assignee: Kao CorporationInventors: Yutaka Kanamaru, Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Patent number: 6835518Abstract: A toner for electrostatic image development comprising a high-softening point polyester having a softening point of 120° C. or more and 170° C. or less; a low-softening point polyester having a softening point of 80° C. or more and less than 120° C.; and a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 7 m2/g or more. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: August 9, 2002Date of Patent: December 28, 2004Assignee: Kao CorporationInventors: Hidenori Tachi, Yasuyuki Tamane, Koji Akiyama, Hiroyuki Kawaji
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Publication number: 20040197691Abstract: A toner for electrostatic image development, containing a resin binder; and a colorant containing a charcoal powder, wherein the charcoal powder has a volume-based median particle size (D50) of 5.6 &mgr;m or less, and a coefficient of variation of 80% or less; a two-component developer containing the toner and a carrier; and a process for development of a two-component developer, including the step of applying the two-component developer to a developing device for two-component development. The toner can be suitably used for, for instance, the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: April 2, 2004Publication date: October 7, 2004Applicant: KAO CORPORATIONInventors: Shinji Moriyama, Yoshihiro Fukushima, Hidenori Tachi
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Publication number: 20040185364Abstract: A toner for development of electrostatic latent images, comprising a resin binder comprising a resin having a softening point of from 120° to 170° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of from 5 to 50% by weight; and a resin having a softening point of 90° C. or more and less than 120° C., a glass transition point of from 58° to 75° C., and a percentage of chloroform-insoluble component of less than 5% by weight; and at least one low-melting point wax having a melting point of from 60° to 90° C. The toner for development of electrostatic latent images has low lowest fixing temperature and is excellent in the offset resistance, the blocking resistance and the durability.Type: ApplicationFiled: April 2, 2004Publication date: September 23, 2004Applicant: Kao CorporationInventors: Yutaka Kanamaru, Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Publication number: 20040116621Abstract: A resin composition having a softening point of from 80° to 165° C., obtained by reacting a poly C2-4 alkylene terephthalate having a melting point of 200° C. or more with a low-molecular weight polyester having a number-average molecular weight of from 400 to 2500; a resin binder for a toner comprising the above resin composition; a toner comprising the above resin binder; a process for preparing a resin composition having a softening point of from 80° to 165° C., comprising the step of reacting a poly C2-4 alkylene terephthalate having a melting point of 200° C. or more with a low-molecular weight polyester having a number-average molecular weight of from 400 to 2500.Type: ApplicationFiled: October 17, 2003Publication date: June 17, 2004Applicant: Kao CorporationInventors: Eiji Morimoto, Hidenori Tachi, Katsutoshi Aoki
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Publication number: 20040072090Abstract: A toner comprising a resin binder and a colorant comprising a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 0.5 to 7 m2/g and a saturation magnetization of from 1 to 40 Am2/kg; and a two-component developer comprising the above toner and a carrier having a saturation magnetization of from 40 to 100 Am2/kg. The toner can be used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: October 7, 2003Publication date: April 15, 2004Applicant: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Patent number: 6677096Abstract: A positively chargeable toner for two-component development comprising a resin binder; a colorant; a releasing agent comprising a wax having a melting point of 50° to 120° C.; and an external additive comprising a positively chargeable silica, the positively chargeable silica having an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less, wherein the positively chargeable toner is usable together with a ferrite carrier having a saturation magnetization of from 40 to 100 Am2/kg. This positively chargeable toner is used for development of an electrostatic latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: GrantFiled: April 25, 2002Date of Patent: January 13, 2004Assignee: Kao CorporationInventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Publication number: 20030073018Abstract: A toner for electrostatic image development comprising a high-softening point polyester having a softening point of 120° C. or more and 170° C. or less; a low-softening point polyester having a softening point of 80° C. or more and less than 120° C.; and a composite oxide of two or more metals, wherein the composite oxide has a BET specific surface area of 7 m2/g or more. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: August 9, 2002Publication date: April 17, 2003Inventors: Hidenori Tachi, Yasuyuki Tamane, Koji Akiyama, Hiroyuki Kawaji
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Publication number: 20030059699Abstract: A toner comprising a resin binder, a black colorant comprising a composite oxide of two or more metals, and a charge control agent comprising a quaternary ammonium salt. The toner is suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: May 16, 2002Publication date: March 27, 2003Inventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima, Yasuyuki Tamane
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Publication number: 20030054276Abstract: A black toner for two-component development, comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals, the composite oxide having a BET specific surface area of 7 m2/g or more; and a two-component developer comprising the black toner for two-component development and a resin-coated carrier. The black toner for two-component development can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: April 25, 2002Publication date: March 20, 2003Inventors: Shinji Moriyama, Yasuyuki Tamane, Hidenori Tachi, Yoshihiro Fukushima, Koji Akiyama
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Publication number: 20030022087Abstract: A positively chargeable toner for two-component development comprising a resin binder; a colorant; a releasing agent comprising a wax having a melting point of 50° to 120° C.; and an external additive comprising a positively chargeable silica, the positively chargeable silica having an absolute deviation of an error of 0.1 or less, against an approximate straight line showing an adhesion state of silicon atoms to carbon atoms, and a free ratio of 5% or less, wherein the positively chargeable toner is usable together with a ferrite carrier having a saturation magnetization of from 40 to 100 Am2/kg. This positively chargeable toner is used for development of an electrostatic latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: April 25, 2002Publication date: January 30, 2003Inventors: Hidenori Tachi, Shinji Moriyama, Yoshihiro Fukushima
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Patent number: 6117607Abstract: A full color toner for nonmagnetic one-component development usable in a developer device including a developer roller and a blade, the blade serving to regulate a toner layer formed on the developer roller into a uniform thickness and to supply electric charges to toners by triboelectric charging, the full color toner for nonmagnetic one-component development including (a) fine resinous particles including at least a colorant and a binder resin having a polyester resin as a main component; and (b) additives externally applied onto a surface of the fine resinous particles, the additives including inorganic fine particles consisting of positively chargeable, inorganic fine particles and negatively chargeable, inorganic fine particles when subjecting the additives to triboelectric charging with an iron powder.Type: GrantFiled: October 8, 1997Date of Patent: September 12, 2000Assignee: Kao CorporationInventors: Jun Shimizu, Hidenori Tachi, Masayuki Maruta