Patents by Inventor Hyo Shu
Hyo Shu 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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Publication number: 20220128917Abstract: A toner including inorganic particles, wherein the inorganic particles include a fluorine-containing alumina, and the toner satisfies both Formula (1) below and Formula (2) below: 2.7?X1/X2?5.5 . . . Formula (1); and 2.1?X1?3.0 . . . Formula (2) where X1 denotes a concentration of aluminum in the toner and X2 denotes a concentration of fluorine in the toner, and the concentration of aluminum and the concentration of fluorine are determined through an X-ray photoelectron spectroscopic analysis method.Type: ApplicationFiled: November 6, 2019Publication date: April 28, 2022Applicant: Ricoh Company, Ltd.Inventors: Hyo Shu, Hisashi Nakajima, Yoshitaka Yamauchi, Katsunori Kurose
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Patent number: 11287757Abstract: A toner including a strontium titanate powdery material as an external additive, the strontium titanate powdery material including Si-containing particles on a surface of the strontium titanate powdery material, the Si-containing particles having a number average circle equivalent diameter of 5 nm or more but 15 nm or less.Type: GrantFiled: April 22, 2020Date of Patent: March 29, 2022Assignee: Ricoh Company, Ltd.Inventors: Hisashi Nakajima, Akihiro Kaneko, Yoshitaka Yamauchi, Katsunori Kurose, Hyo Shu
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Patent number: 11281118Abstract: A toner comprising base particles and external additive particles covering the base particles is provided. The base particles comprise a binder resin and a colorant. The external additive particles comprise at least one member selected from the group consisting of fluorine-containing aluminum hydroxide, fluorine-containing boehmite, and fluorine-containing pseudoboehmite.Type: GrantFiled: July 15, 2020Date of Patent: March 22, 2022Assignee: RICOH COMPANY, LTD.Inventors: Shinya Hanatani, Masayuki Ishii, Hyo Shu
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Publication number: 20210026267Abstract: A toner comprising base particles and external additive particles covering the base particles is provided. The base particles comprise a binder resin and a colorant. The external additive particles comprise at least one member selected from the group consisting of fluorine-containing aluminum hydroxide, fluorine-containing boehmite, and fluorine-containing pseudoboehmite.Type: ApplicationFiled: July 15, 2020Publication date: January 28, 2021Inventors: Shinya HANATANI, Masayuki Ishii, Hyo Shu
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Publication number: 20200363743Abstract: A toner including a strontium titanate powdery material as an external additive, the strontium titanate powdery material including Si-containing particles on a surface of the strontium titanate powdery material, the Si-containing particles having a number average circle equivalent diameter of 5 nm or more but 15 nm or less.Type: ApplicationFiled: April 22, 2020Publication date: November 19, 2020Inventors: Hisashi NAKAJIMA, Akihiro Kaneko, Yoshitaka Yamauchi, Katsunori Kurose, Hyo Shu
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Publication number: 20200026210Abstract: A toner is provided. The toner comprises a binder resin, a metal-containing azo dye, and a quaternary ammonium salt, has an average circularity of from 0.85 to 0.95, and is free of a tin compound having Sn—C bond.Type: ApplicationFiled: April 30, 2019Publication date: January 23, 2020Inventors: Yu HIRAI, Masayuki Ishii, Hyo Shu, Masayuki Kakimoto, Yoshitaka Sekiguchi, Shohta Kobayashi, Shinya Hanatani, Kohtaroh Ogino, Yasuaki Iwamoto
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Patent number: 9069271Abstract: An image forming apparatus including an image forming device forming a toner image on a recording material, and a fixing device including an endless fixing belt feeding the recording material at a speed of 400 to 1,700 mm/sec while heating to fix the toner image thereon. The fixing belt has a rubber layer located on a substrate and having thickness of 400 ?m to 700 ?m, and a fluorine-containing resin layer located on the rubber layer and having thickness of 2 ?m to 20 ?m. The toner includes a release agent including a microcrystalline wax and/or a synthetic ester wax, and a binder resin including a crystalline polyester and an amorphous polyester. The ratio (W/R) of the height (W) of the third falling peak of the crystalline polyester to the height (R) of the maximum rising peak of the amorphous polyester in the FT-IR spectrum of the toner is 0.045 to 0.850.Type: GrantFiled: February 9, 2012Date of Patent: June 30, 2015Assignee: RICOH COMPANY, LTD.Inventors: Hyo Shu, Hiroki Ishii, Wakana Itoh
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Patent number: 8999618Abstract: A toner set, including: at least one chromatic toner containing a colorant; and a transparent toner containing no colorant, wherein the chromatic toner and the transparent toner each include a releasing agent and a binder resin, and wherein an amount of a tetrahydrofuran insoluble matter in the transparent toner is smaller than an amount of a tetrahydrofuran insoluble matter in the chromatic toner.Type: GrantFiled: May 20, 2013Date of Patent: April 7, 2015Assignee: Ricoh Company, Ltd.Inventors: Ryuuta Yoshida, Satoshi Ogawa, Masaki Watanabe, Hyo Shu, Naohiro Watanabe
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Patent number: 8886062Abstract: An image forming apparatus having a system speed of from 400 to 1,700 mm/sec, including a latent image bearer; an image developer developing the latent image with two-component developer including a toner and a carrier; a transferer, a toner concentration detector; a toner feeder; and a controller, wherein the toner comprises a release agent and a binder resin including a crystalline polyester resin and an amorphous resin, wherein a ratio (W/R) of a maximum rising peak height (W) of the crystalline polyester resin to a maximum rising peak height (R) of the amorphous resin, which are observed respective infrared absorption spectra when measured by an IR spectroscopy using a Fourier transform infrared spectroanalyzer, is from 0.22 to 0.55.Type: GrantFiled: May 10, 2012Date of Patent: November 11, 2014Assignee: Ricoh Company, Ltd.Inventor: Hyo Shu
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Patent number: 8785099Abstract: A toner including toner particles including a binder resin containing at least one polyester resin comprising an inorganic tin (II) compound and an external additive including a particulate inorganic material having a volume average particle diameter greater than 70 nm and less than 300 nm. The binder resin preferably includes a polyester resin having a weight average molecular weight of from 5,000 to 50,000 and another resin having a weight average molecular weight of from 200,000 to 400,000. A developer including the toner; and a developing device, an image forming apparatus and a process cartridge, which form toner images using the toner are also provided.Type: GrantFiled: July 6, 2011Date of Patent: July 22, 2014Assignee: Ricoh Company, LimitedInventors: Hyo Shu, Mitsuo Aoki, Minoru Masuda, Kumi Hasegawa
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Patent number: 8778588Abstract: To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A>0.165, and has storage elastic modulus (dyne/cm2) G?(Tfb) satisfying G?(Tfb)?1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer: A=|[(r1)?ln G?(r2)]/(T1?T2)|??Formula (1) (where T1 is temperature (° C.) at which storage elastic modulus G?(r1) is 1×105 (dyne/cm2) and T2 is temperature (° C.) at which storage elastic modulus G?(r2) is 1×103 (dyne/cm2) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and | | represents an absolute value.).Type: GrantFiled: October 12, 2011Date of Patent: July 15, 2014Assignee: Ricoh Company, Ltd.Inventors: Teruki Kusahara, Junichi Awamura, Tsuyoshi Sugimoto, Hyo Shu, Tomomi Suzuki, Osamu Uchinokura, Takahiro Honda, Satoshi Kojima, Satoshi Ogawa, Daisuke Inoue, Koshi Sato, Daisuke Ito, Ryuuta Yoshida, Syouko Satoh
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Patent number: 8750760Abstract: An image forming apparatus including a latent electrostatic image bearing member, a latent electrostatic image forming unit, a developing unit, a transfer unit and a fixing unit, wherein the fixing unit includes rotatable heating member heating the recording medium having the unfixed visible image, rotatable pressing member coming into contact with the rotatable heating member to form a nip portion, and an air separation member separating the recording medium from the rotatable heating member by air, the toner including toner base particles each including binder resin and releasing agent, the binder resin including crystalline polyester resin and non-crystalline resin, and ratio of W/R being 0.045 to 0.85, where W denotes peak height in spectrum of the crystalline polyester resin, R denotes peak height in spectrum of the non-crystalline resin, and each of the spectra is measured by total transmission method (KBr method) using Fourier transform infrared (FT-IR) spectrometer.Type: GrantFiled: June 24, 2011Date of Patent: June 10, 2014Assignee: Ricoh Company, Ltd.Inventor: Hyo Shu
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Patent number: 8703376Abstract: A toner, wherein a binder resin contains a polyester resin (A) produced by polycondensing an alcohol component with a carboxylic acid component which contains a rosin compound in an amount of 5% by mass or more of the total amount by mass of the alcohol component and the carboxylic acid component, and a polyester resin (B) produced by polycondensing an alcohol component containing an alkylene oxide adduct of bisphenol A represented by General Formula (1) given below with a carboxylic acid component, and wherein the toner contains abietic acid in an amount of 0.01% by mass to 1% by mass: where R1 and R2 each represent C2-C4 alkylene; R3 and R4 are each any one of a hydrogen atom, C1-C6 straight-chain alkyl, and C1-C6 branched-chain alkyl; and x and y each represent a positive integer and the sum of x and y is 1 to 16.Type: GrantFiled: November 24, 2009Date of Patent: April 22, 2014Assignee: Ricoh Company, Ltd.Inventors: Saori Yamada, Shinya Nakayama, Hisashi Nakajima, Mitsuo Aoki, Hyo Shu, Hiroyuki Kishida
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Publication number: 20140093289Abstract: An image forming apparatus has a system velocity of 400 to 1,700 mm/sec and includes a fixing belt including a base layer; a silicon rubber layer; and a fluorine resin layer. A thickness L2 of the fluorine resin layer is in range of 2?L2?20 ?m. A thickness L1 of the silicone rubber layer is in range of 400?L1?750 ?m. The toner includes a release agent and a binder resin including a crystalline polyester resin and an amorphous polyester resin. A ratio W/R of a height W of third falling peak of an infrared absorption spectrum of the crystalline polyester resin to a height R of the maximum rising peak of an infrared absorption spectrum of the amorphous polyester resin is from 0.045 to 0.850. The content of inorganic fine particles is 0.80 to 5.00 parts per 100 parts of toner base particles.Type: ApplicationFiled: September 12, 2013Publication date: April 3, 2014Inventors: Hiroki ISHII, Hyo Shu, Wakana Itoh, Takuma Higa
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Publication number: 20130316280Abstract: A toner set, including: at least one chromatic toner containing a colorant; and a transparent toner containing no colorant, wherein the chromatic toner and the transparent toner each include a releasing agent and a binder resin, and wherein an amount of a tetrahydrofuran insoluble matter in the transparent toner is smaller than an amount of a tetrahydrofuran insoluble matter in the chromatic toner.Type: ApplicationFiled: May 20, 2013Publication date: November 28, 2013Inventors: Ryuuta YOSHIDA, Satoshi OGAWA, Masaki WATANABE, Hyo SHU, Naohiro WATANABE
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Patent number: 8546055Abstract: A toner containing at least a binder resin, releasing agent, and colorant, wherein the binder resin contains polyester resin (A), polyester resin (B), and polyester resin (C), which is prepared by condensation-polymerizing (i) an alcohol component containing an alkylene oxide adduct of bisphenol compound and (ii) a carboxylic acid component; at least one of the polyester resin (A) and polyester resin (B) is a polyester resin prepared by condensation-polymerizing (i) the alcohol component substantially composed of only aliphatic alcohol and containing 1,2-propanediol in an amount of 65 mole % or more of a divalent alcohol component and (ii) the carboxylic acid component; and a softening point Tm(A) of the polyester resin (A) is 10 C or more higher than Tm(B) of the polyester resin (B), and the absolute difference between Tm(C) of the polyester resin (C) and the Tm(B) is 5° C. or less.Type: GrantFiled: September 2, 2009Date of Patent: October 1, 2013Assignee: Ricoh Company, Ltd.Inventors: Shinya Nakayama, Hisashi Nakajima, Saori Yamada, Mitsuo Aoki, Hyo Shu, Hiroyuki Kishida
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Patent number: 8377618Abstract: A toner is provided including a mother toner including a crystalline polyester resin, an amorphous resin, and a wax, and an external additive in an amount of from 0.30 to 0.55 parts by weight based on 100 parts by weight of the mother toner. The toner satisfies the following equation 0.36?(2.77×C/R+1.97×W/R)/X?1.85, wherein each of C, W, and R represents a height of an absorbance peak specific to the crystalline polyester resin, the wax, and the amorphous resin, respectively, measured by a FT-IR ATR method, and X represents an amount (parts by weight) of the external additive. An image forming method and apparatus using the toner are also provided.Type: GrantFiled: September 15, 2008Date of Patent: February 19, 2013Assignee: Ricoh Company LimitedInventors: Hyo Shu, Yasuaki Iwamoto, Yasutada Shitara, Minoru Masuda
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Publication number: 20130022371Abstract: To provide a toner, which contains a binder resin, a colorant, and a releasing agent, wherein the binder resin contains a low molecular weight resin component, where the low molecular weight resin component has a resin softening coefficient (A), represented by the following formula (1), satisfying A>0.165, and has storage elastic modulus (dyne/cm2) G?(Tfb) satisfying G?(Tfb)?1×104 where Tfb is a flow onset temperature (° C.) of the low molecular weight resin component as measured by a capillary rheometer: A=|[ln G?(r1)?ln G?(r2)]/(T1?T2)|??Formula (1) (where T1 is temperature (° C.) at which storage elastic modulus G?(r1) is 1×105 (dyne/cm2) and T2 is temperature (° C.) at which storage elastic modulus G?(r2) is 1×103 (dyne/cm2) as measured by means of a viscoelasticity measuring device with measuring frequency of 1 Hz, and measuring distortion of 1 deg; and ? represents an absolute value.Type: ApplicationFiled: October 12, 2011Publication date: January 24, 2013Applicant: Ricoh Company, Ltd.Inventors: Teruki Kusahara, Junichi Awamura, Tsuyoshi Sugimoto, Hyo Shu, Tomomi Suzuki, Osamu Uchinokura, Takahiro Honda, Satoshi Kojima, Satoshi Ogawa, Daisuke Inoue, Koshi Sato, Daisuke Ito, Ryuuta Yoshida, Syouko Satoh
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Patent number: 8357481Abstract: An image forming method including forming an electrostatic latent image on a photoreceptor; developing the latent image with a developer including a toner using a center-feed developing device to form a toner image; transferring the toner image onto a receiving material; and fixing the toner image using a fixing member coated with silicone oil. The toner includes at least a binder resin; a colorant; and a quaternary ammonium salt having a specific formula, wherein when the toner is dispersed in ethanol using ultrasonic waves, the dispersion has a turbidity of from 0.4 to 1.0 when the turbidity is determined using a haze meter. An image forming apparatus including a photoreceptor; a center-feed developing device using a developer including the toner; a transferring device; a fixing device using a fixing member coated with silicone oil; and a cleaner for the photoreceptor.Type: GrantFiled: August 24, 2009Date of Patent: January 22, 2013Assignee: Ricoh Company, LimitedInventors: Hiroyuki Kishida, Masahide Inoue, Hyo Shu, Yasutada Shitara
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Publication number: 20120301160Abstract: An image forming apparatus having a system speed of from 400 to 1,700 mm/sec, including a latent image bearer; an image developer developing the latent image with two-component developer including a toner and a carrier; a transferer, a toner concentration detector; a toner feeder; and a controller, wherein the toner comprises a release agent and a binder resin including a crystalline polyester resin and an amorphous resin, wherein a ratio (W/R) of a maximum rising peak height (W) of the crystalline polyester resin to a maximum rising peak height (R) of the amorphous resin, which are observed respective infrared absorption spectra when measured by an IR spectroscopy using a Fourier transform infrared spectroanalyzer, is from 0.22 to 0.55.Type: ApplicationFiled: May 10, 2012Publication date: November 29, 2012Inventor: Hyo SHU