Patents by Inventor Hidekazu Yaguchi
Hidekazu Yaguchi 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: 7288351Abstract: A magenta toner for developing electrostatic images provided which contains a binder resin and a colorant, wherein the colorant includes a mixed crystal of two or more colorants and when a solid patch is fixed on art paper complying with the ISO standard by using this toner, a resulting fixed image color satisfies at least one of the following formulae (b*)<0.85 (a*)?67.92; and (b*)>?7.94(a*)+591.85. The color difference ?E between the color of the fixed image and the color characterized by L*: 46.6, a*: 75.1 and b*: ?4.4 is preferably less than 6. The colorant is preferably a mixed crystal of a quinacridone colorant and a monoazo colorant. Moreover, the invention provides a method for producing the magenta toner, a developer containing the magenta toner, and an image-forming method using the magenta toner.Type: GrantFiled: March 8, 2004Date of Patent: October 30, 2007Assignee: Fuji Xerox Co., Ltd.Inventors: Hidekazu Yaguchi, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Tsutomu Kubo, Shigeru Seitoku
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Patent number: 7094514Abstract: The present invention relates to an image forming method wherein the surface of an electrophotographic photoreceptor contains a compound having an unsaturated double bond, a toner for electrostatic latent image development has a binder resin obtained by polymerizing a polymerizable monomer having a vinyl double bond, has at least one kind of metal oxide particles and/or metal nitride particles on the surface of the toner and has a shape factor SF1 of 110 to 140, and the storage of elastic modulus at 160° C. (G?(160)) of the toner for electrostatic latent image development is in a predetermined range.Type: GrantFiled: September 12, 2003Date of Patent: August 22, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Kazuhiko Yanagida, Shigeru Seitoku, Yasuo Matsumura, Sueko Sakai, Hiroyuki Tanaka
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Patent number: 7074540Abstract: An image forming apparatus is capable of performing image formation at a processing speed of not lower than 150 mm/s. An electrophotographic photoreceptor comprises a surface layer containing a siloxane-bases resin having charge-transporting properties and a crosslinked structure. A cleaning device comprises a brush member disposed such that the leading end of said brush comes in contact with said electrophotographic photoreceptor. The product (Rz×We) of the surface roughness (Rz [?m]) of said electrophotographic photoreceptor after 200,000 rotations thereof and the wear rate of said electrophotographic photoreceptor per 1,000 rotations (We [nm]) is not greater than 20.Type: GrantFiled: November 1, 2004Date of Patent: July 11, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Katsumi Nukada, Kazuhiro Koseki, Wataru Yamada, Takayuki Yamashita, Masahiro Iwasaki, Takahiro Suzuki, Kiyoshi Chatani, Yoshinari Ueno, Hidekazu Yaguchi, Kazuhiko Yanagida
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Patent number: 7033719Abstract: The present invention provides a toner, comprising a binder resin and a colorant, and having a plurality of absorption peaks in a wave number range of 400 to 4,000 cm?1 in an infrared absorption spectrum, wherein among the plurality of absorption peaks, a maximum absorption peak appears at wave number ranging from 500 to 800 cm?1 and, given that the intensity of the maximum absorption peak is P1 and that the intensity of a second greatest absorption peak is P2, P1 and P2 satisfy the following equation (1), a developer comprising this toner, an image forming method using this toner, and an image forming apparatus using this toner. 1.6?P1/P2?6.Type: GrantFiled: July 28, 2003Date of Patent: April 25, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Manabu Serizawa, Kazuhiko Yanagida, Hidekazu Yaguchi, Takahisa Fujii, Emi Takahashi, Yasuo Matsumura
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Patent number: 7018764Abstract: The present invention relates to a toner for developing electrostatic images characterized in that a reactive polymer which cross-links when heated at a temperature higher than a maximum temperature at the preparation of the toner for developing electrostatic images, at image fixation and/or after fixation, is contained in a toner for developing electrostatic images containing at least a binder resin, and/or is added to the surface thereof.Type: GrantFiled: June 19, 2003Date of Patent: March 28, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Takahisa Fujii, Tsutomu Kubo, Shigeru Seitoku
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Publication number: 20060051691Abstract: A toner for developing an electrostatic latent image is provided that can prevent occurrence of blister even with coated paper having a coated surface, exhibits excellent releasing performance in oilless fixing, and realizes both high glossiness and OHP transparency for an image to be formed. A process for producing the toner, a developer containing the toner, and a process for forming an image using the toner are also provided. The toner for developing an electrostatic latent image contains a binder resin, a releasing agent and a colorant, in which the binder resin has a number average molecular weight (Mn) in a range of from 9,000 to 18,000 and a molecular weight distribution represented by a ratio (Mw/Mn) of a weight average molecular weight (Mw) and a number average molecular weight (Mn) of 2.5 or less, and the binder resin contains a vinyl resin.Type: ApplicationFiled: September 12, 2005Publication date: March 9, 2006Applicant: FUJI XEROX CO., LTD.Inventors: Tomohito Nakajima, Satoshi Yoshida, Hidekazu Yaguchi, Takahisa Fujii, Yasuo Matsumura
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Patent number: 7001701Abstract: The present invention discloses a color toner providing highly gloss image and documents with excellent long term storability; an electrostatic latent image developer; and an image forming method. Disclosed is a color toner comprising a binder resin and colorant, wherein the weight average molecular weight of the binder resin is from 6000 to 45000, the toner's glass transition temperature (Tg) is from 40 to 70° C., the loss tangent tan ? of dynamic viscoelasticity is from 0.1 to 2.5 in the temperature of from the toner's glass transition temperature (Tg) to the temperature at which the loss modulus (G?) is 1×105 Pa, and the toner comprises 3 to 20% by mass of an ester derivative of an alicyclic compound having 1 or more carboxyl groups, and an electrostatic latent image developer and an image forming method, which use the color toner.Type: GrantFiled: October 26, 2004Date of Patent: February 21, 2006Assignee: Fuji Xerox Co., Ltd.Inventors: Takahisa Fujii, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Masaki Nakamura, Daisuke Ishizuka
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Patent number: 6942953Abstract: The present invention provides an image forming method comprising the steps of forming an electrostatic latent image on a surface of an electrostatic latent image bearing body, forming a toner image by developing the electrostatic latent image by using a toner, transferring the toner image to the surface of a recording medium, and fusing the transferred toner image on the surface of the recording medium by bringing the toner image into contact with a heating medium, which has a resin coating layer formed on the surface thereof, and thereby melting the toner image. The toner contains a binder resin containing monomers having vinyl double bonds. A storage elasticity of the toner at 180° C. is in a range of 1×103 to 8×103 Pa and a contact angle of the surface of the heating medium to water at 25° C. is in a range of 50 to 100°.Type: GrantFiled: December 17, 2003Date of Patent: September 13, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Hiroyuki Tanaka, Shigeru Seitoku, Kazuhiko Yanagida, Yasuo Matsumura, Shuji Sato
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Patent number: 6933092Abstract: A magenta toner for electrophotography includes a binder resin and a colorant, wherein the toner contains at least a naphthol pigment having a structure represented by the following general formula (1) as the colorant, and has a shape factor SF1 of 110 to 140 obtained by the equation below and a volume average particle size of 2 to 9 ?m: wherein R represents the following group, and R? represents a hydrogen atom, an alkyl group or a methoxy group; SF1=R2/A×?/4×100 wherein R represents the maximum length of the toner and A represents the projected area of the toner.Type: GrantFiled: August 16, 2002Date of Patent: August 23, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Satoshi Yoshida, Yasuo Matsumura, Toyofumi Inoue, Hidekazu Yaguchi, Takahisa Fujii
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Patent number: 6890694Abstract: A toner for developing an electrostatic image and a process for producing the same, a developer for developing an electrostatic image, and a process for producing an image are provided. The toner contains a colorant and a binder resin, and also contains a polyolefin resin containing a polar group and having a glass transition point of 20° C. or less and a weight average molecular weight of 10,000 or more.Type: GrantFiled: April 14, 2003Date of Patent: May 10, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Yasuo Matsumura, Hidekazu Yaguchi, Satoshi Yoshida, Takahisa Fujii, Tomohito Nakajima
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Publication number: 20050089788Abstract: An image forming apparatus is capable of performing image formation at a processing speed of not lower than 150 mm/s. An electrophotographic photoreceptor comprises a surface layer containing a siloxane-bases resin having charge-transporting properties and a crosslinked structure. A cleaning device comprises a brush member disposed such that the leading end of said brush comes in contact with said electrophotographic photoreceptor. The product (Rz×We) of the surface roughness (Rz [?m]) of said electrophotographic photoreceptor after 200,000 rotations thereof and the wear rate of said electrophotographic photoreceptor per 1,000 rotations (We [nm]) is not greater than 20.Type: ApplicationFiled: November 1, 2004Publication date: April 28, 2005Applicant: Fuji Xerox Co., Ltd.Inventors: Katsumi Nukada, Kazuhiro Koseki, Wataru Yamada, Takayuki Yamashita, Masahiro Iwasaki, Takahiro Suzuki, Kiyoshi Chatani, Yoshinari Ueno, Hidekazu Yaguchi, Kazuhiko Yanagida
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Publication number: 20050058923Abstract: The present invention discloses a color toner providing highly gloss image and documents with excellent long term storability; an electrostatic latent image developer; and an image forming method. Disclosed is a color toner comprising a binder resin and colorant, wherein the weight average molecular weight of the binder resin is from 6000 to 45000, the toner's glass transition temperature (Tg) is from 40 to 70° C., the loss tangent tan ? of dynamic viscoelasticity is from 0.1 to 2.5 in the temperature of from the toner's glass transition temperature (Tg) to the temperature at which the loss modulus (G?) is 1×105 Pa, and the toner comprises 3 to 20% by mass of an ester derivative of an alicyclic compound having 1 or more carboxyl groups, and an electrostatic latent image developer and an image forming method, which use the color toner.Type: ApplicationFiled: October 26, 2004Publication date: March 17, 2005Applicant: FUJI XEROX CO., LTD.Inventors: Takahisa Fujii, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Masaki Nakamura, Daisuke Ishizuka
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Patent number: 6846603Abstract: The present invention discloses a color toner providing highly gloss image and documents with excellent long term storability; an electrostatic latent image developer; and an image forming method. Disclosed is a color toner comprising a binder resin and colorant, wherein the weight average molecular weight of the binder resin is from 6000 to 45000, the toner's glass transition temperature (Tg) is from 40 to 70° C., the loss tangent tan ? of dynamic viscoelasticity is from 0.1 to 2.5 in the temperature of from the toner's glass transition temperature (Tg) to the temperature at which the loss modulus (G?) is 1×105 Pa, and the toner comprises 3 to 20% by mass of an ester derivative of an alicyclic compound having 1 or more carboxyl groups, and an electrostatic latent image developer and an image forming method, which use the color toner.Type: GrantFiled: February 25, 2003Date of Patent: January 25, 2005Assignee: Fuji Xerox Co., Ltd.Inventors: Takahisa Fujii, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Masaki Nakamura, Daisuke Ishizuka
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Publication number: 20050008960Abstract: A magenta toner for developing electrostatic images provided which contains a binder resin and a colorant, wherein the colorant includes a mixed crystal of two or more colorants and when a solid patch is fixed on art paper complying with the ISO standard by using this toner, a resulting fixed image color satisfies at least one of the following formulae (b*)<0.85 (a*)?67.92; and (b*)>?7.94(a*)+591.85. The color difference ?E between the color of the fixed image and the color characterized by L*: 46.6, a*: 75.1 and b*: ?4.4 is preferably less than 6. The colorant is preferably a mixed crystal of a quinacridone colorant and a monoazo colorant. Moreover, the invention provides a method for producing the magenta toner, a developer containing the magenta toner, and an image-forming method using the magenta toner.Type: ApplicationFiled: March 8, 2004Publication date: January 13, 2005Applicant: FUJI XEROX., LTD.Inventors: Hidekazu Yaguchi, Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Tsutomu Kubo, Shigeru Seitoku
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Publication number: 20040253530Abstract: The present invention provides an image forming method comprising the steps of forming an electrostatic latent image on a surface of an electrostatic latent image bearing body, forming a toner image by developing the electrostatic latent image by using a toner, transferring the toner image to the surface of a recording medium, and fusing the transferred toner image on the surface of the recording medium by bringing the toner image into contact with a heating medium, which has a resin coating layer formed on the surface thereof, and thereby melting the toner image. The toner contains a binder resin containing monomers having vinyl double bonds. A storage elasticity of the toner at 180° C. is in a range of 1×103 to 8×103 Pa and a contact angle of the surface of the heating medium to water at 25° C. is in a range of 50 to 100°.Type: ApplicationFiled: December 17, 2003Publication date: December 16, 2004Applicant: FUJI XEROX CO., LTD.Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Hiroyuki Tanaka, Shigeru Seitoku, Kazuhiko Yanagida, Yasuo Matsumura, Shuji Sato
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Patent number: 6828073Abstract: Such a toner for developing an electrostatic image is to be provided that has a wide fixable temperature range, is excellent in development and transfer performance and excellent in releasing performance, realizes both glossiness and transparency, and is capable of providing an image (particularly a color image) of a wide color reproduction range having high quality and high durability, a developer for an electrostatic image, and a process for forming an image. The toner for developing an electrostatic image contains a binder resin, a colorant and an inorganic metallic salt, and an amount of a toluene insoluble component (provided that the colorant, a releasing agent and inorganic and organic insoluble particles are excluded therefrom) is from 0.5 to 10% by weight. The developer for an electrostatic image and the process for forming an image use the toner for developing an electrostatic image.Type: GrantFiled: August 16, 2002Date of Patent: December 7, 2004Assignee: Fuji Xerox Co., Ltd.Inventors: Yasuo Matsumura, Hidekazu Yaguchi, Satoshi Yoshida, Takahisa Fujii, Tomohito Nakajima
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Patent number: 6821702Abstract: The present invention relates to a method of forming images. The method includes the steps of forming electrostatic latent images on an electrostatic image carrier, forming toner images with a toner-containing developer by developing the electrostatic latent images on the electrostatic image carrier, transferring the toner images onto a transfer material, and thermally fixing the toner images, wherein an electrophotographic toner including containing at least a binder resin, a colorant, and a releasing agent in the range of 10 to 25% by mass relative to toner particles and having a shape factor SF1 of 140 or less is used as the toner, and the thermal fixing step is carried out so as to satisfy, at a process speed of at least 170 mm/sec., the relationship (A): 200<0.7×&agr;+2000×&bgr; wherein &agr; is a fixing temperature (° C.), &bgr; is a heating time (second), and &agr; is 160° C. or higher.Type: GrantFiled: January 15, 2003Date of Patent: November 23, 2004Assignee: Fuji Xerox Co., Ltd.Inventors: Takahisa Fujii, Yasuo Matsumura, Hidekazu Yaguchi, Satoshi Yoshida, Tomohito Nakajima
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Publication number: 20040191662Abstract: The present invention provides: a toner for developing electrostatic images including as a main component thereof a binder resin having a copolymer comprised of a combination of a high Tg monomer having a structure represented by the following structural formula (1) and a glass transition temperature of 50° C. or higher, a low Tg monomer having a structure represented by the following structural formula (2) and a glass transition temperature of lower than 50° C., and a hydrophilic monomer having a structure represented by the following structural formula (3); a process for preparing the toner for developing electrostatic images; a developer for developing electrostatic images containing the toner; and an image forming method using the toner.Type: ApplicationFiled: September 10, 2003Publication date: September 30, 2004Applicant: FUJI XEROX CO., LTD.Inventors: Yasuo Matsumura, Kazuhiko Yanagida, Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Shigeru Seitoku
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Publication number: 20040185367Abstract: The present invention relates to an image forming method wherein the surface of an electrophotographic photoreceptor contains a compound having an unsaturated double bond, a toner for electrostatic latent image development has a binder resin obtained by polymerizing a polymerizable monomer having a vinyl double bond, has at least one kind of metal oxide particles and/or metal nitride particles on the surface of the toner and has a shape factor SF1 of 110 to 140, and the storage of elastic modulus at 160° C. (G′(160)) of the toner for electrostatic latent image development is in a predetermined range.Type: ApplicationFiled: September 12, 2003Publication date: September 23, 2004Applicant: FUJI XEROX CO., LTD.Inventors: Manabu Serizawa, Hidekazu Yaguchi, Tsutomu Kubo, Kazuhiko Yanagida, Shigeru Seitoku, Yasuo Matsumura, Sueko Sakai, Hiroyuki Tanaka
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Publication number: 20040152004Abstract: The present invention provides a toner, comprising a binder resin and a colorant, and having a plurality of absorption peaks in a wave number range of 400 to 4,000 cm−1 in an infrared absorption spectrum, wherein among the plurality of absorption peaks, a maximum absorption peak appears at wave number ranging from 500 to 800 cm−1 and, given that the intensity of the maximum absorption peak is P1 and that the intensity of a second greatest absorption peak is P2, P1 and P2 satisfy the following equation (1), a developer comprising this toner, an image forming method using this toner, and an image forming apparatus using this toner.Type: ApplicationFiled: July 28, 2003Publication date: August 5, 2004Applicant: FUJI XEROX CO., LTD.Inventors: Manabu Serizawa, Kazuhiko Yanagida, Hidekazu Yaguchi, Takahisa Fujii, Emi Takahashi, Yasuo Matsumura