Patents by Inventor Junichi Awamura
Junichi Awamura 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: 8518622Abstract: A toner containing a binder resin, a colorant, and a releasing agent, wherein the colorant contains a mixed crystal of a C. I. PIGMENT YELLOW 185 and a C. I. PIGMENT YELLOW 139, and wherein a mass ratio of the C. I. PIGMENT YELLOW 185 to the C. I. PIGMENT YELLOW 139 (mass of the C. I. PIGMENT YELLOW 185/mass of the C. I. PIGMENT YELLOW 139) in the toner is 95/5 to 50/50.Type: GrantFiled: June 14, 2011Date of Patent: August 27, 2013Assignee: Ricoh Company, Ltd.Inventors: Satoshi Ogawa, Daisuke Inoue, Daisuke Ito, Osamu Uchinokura, Junichi Awamura, Teruki Kusahara, Satoshi Kojima, Mamoru Hozumi, Shoko Sato
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Publication number: 20130196260Abstract: A toner including: a binder resin containing a non-crystalline resin and a crystalline resin; a colorant; and, a releasing agent, wherein the releasing agent has a melting point of 55° C. to 80° C., and wherein the toner satisfies the following Expressions 1 and 2: (Expression 1): 20,000 Pa·s?G1?50,000 Pa·s; and (Expression 2): (G4/G2)/(G3/G1) 1.00, where G1 is a storage modulus, G2 is a loss modulus, G3 is a storage modulus and G4 is a loss modulus, and the storage modulus G1 and the loss modulus G2 are measured at 80° C. when the toner is heated from 70° C. to 150° C. and the storage modulus G3 and the loss modulus G4 are measured at 80° C. when the toner heated to 150° C. is cooled to 70° C.Type: ApplicationFiled: December 28, 2012Publication date: August 1, 2013Inventors: Ryuuta YOSHIDA, Takahiro HONDA, Junichi AWAMURA, Osamu UCHINOKURA, Masaki WATANABE, Daisuke INOUE, Tomoki MURAYAMA, Mamoru HOZUMI
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Patent number: 8492063Abstract: A method of manufacturing a toner including forming a wax liquid dispersion in which a wax is dispersed in an organic solvent (A1), mixing an organic layer including the wax liquid dispersion, a binder resin and an organic solvent (A) to form an oil phase and dispersing and emulsifying the oil phase in an aqueous medium to obtain an emulsified liquid dispersion, wherein the aspect ratio average of the wax in the wax liquid dispersion is from 0.3 to 0.7 and the toner includes toner particles satisfying the following relationship (1) in an amount of 20% by number or smaller based on all toner particles: 0.5<D2/D1, relationship (1), where D1 represents the major diameter (D1) of the toner and D2 represents the major diameter of the wax.Type: GrantFiled: November 28, 2008Date of Patent: July 23, 2013Assignee: Ricoh Company, LimitedInventors: Junichi Awamura, Akinori Saitoh, Masahide Yamada, Osamu Uchinokura, Tomomi Suzuki
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Patent number: 8455172Abstract: A method for producing a toner, containing: dispersing, in an aqueous medium, an oil phase which contains an organic solvent, and a binder resin component contained in the organic solvent, where the binder resin component contains a crystalline polyester resin and an amorphous polyester resin; and removing the organic solvent from the dispersion to obtain the toner, in which the dispersing further contains heating and dissolving the crystalline polyester and the amorphous polyester in the organic solvent to obtain a solution, cooling the solution so as to recrystallize the crystalline polyester resin, and mechanically pulverizing the recrystallized crystalline polyester resin so as to obtain a crystalline polyester dispersion.Type: GrantFiled: September 27, 2010Date of Patent: June 4, 2013Assignee: Ricoh Company, Ltd.Inventors: Junichi Awamura, Hiroshi Yamashita, Teruki Kusahara, Tsuyoshi Sugimoto, Tomomi Suzuki
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Publication number: 20130130171Abstract: A toner including a core particle, an inner shell layer covering the core, and an outer shell layer covering the inner shell layer is provided. The core particle includes a resin P. The inner shell layer includes fine particles of a resin A. The outer shell layer includes fine particles of a resin B. The toner satisfies the following formulae (1) to (3): 4.5?T½(P)?Tfb(P)?14??(1) 20?T½(A)?Tfb(A)?40??(2) 23.5?T½(B)?Tfb(B)?40??(3) wherein T½(P), T½(A), and T½(B) represent ½ method temperatures of the resins P, A, and B, respectively, and Tfb(P), Tfb(A), and Tfb(B) represent flow beginning temperatures of the resins P, A, and B, respectively, and wherein the ½ method temperatures and the flow beginning temperatures are measured by a flowtester.Type: ApplicationFiled: November 1, 2012Publication date: May 23, 2013Inventors: Masaki Watanabe, Osamu Uchinokura, Junichi Awamura, Takahiro Honda, Satoshi Ogawa, Tsuneyasu Nagatomo, Hiroshi Yamashita
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Patent number: 8367292Abstract: A toner including a binder resin, a coloring agent, and a releasing agent, the toner formed by dispersing a toner liquid material which is prepared by dispersing the binder resin, the prepolymer, an elongation agent and/or a cross-linking agent for the prepolymer, the coloring agent, and the releasing agent in an organic solvent, dispersing the toner liquid material in an aqueous medium to obtain a liquid dispersion in at least one of cross linking reaction and elongation reaction, and removing the organic solvent from the liquid dispersion, and the toner satisfying the following relationship: 1.35< or =M(g)/M(p)< or =1.90, where M(g) represents the content of the gel composition formed in the at least one of cross linking reaction and elongation reaction and M(P) represents the content of the prepolymer in the toner liquid material when the total of M(P) and the content of the binder resin in the toner liquid material is set to be 100 g.Type: GrantFiled: February 19, 2010Date of Patent: February 5, 2013Assignee: Ricoh Company, LimitedInventors: Teruki Kusahara, Junichi Awamura, Tomomi Suzuki, Toshihiko Karato
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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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Publication number: 20120288299Abstract: A set of toners including yellow, cyan, magenta, and black toner, each of which containing a binder resin containing a crystalline resin and a non-crystalline resin, a releasing agent, and a corresponding coloring agent, wherein the following relationship is satisfied: 0.8<EBk/EFc<0.95, where EBk represents the amount of heat of melting (mJ/mg) for the black toner and EFc represents the average amount of heat of melting (mJ/mg) of the yellow toner, magenta toner, and cyan toner from 50° C. to 100° C. at the first temperature rising in differential scanning calorimetry (DSC).Type: ApplicationFiled: April 18, 2012Publication date: November 15, 2012Inventors: Osamu UCHINOKURA, Satoshi Ogawa, Junichi Awamura, Teruki Kusahara, Daisuke Ito, Daisuke Inoue
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Patent number: 8268526Abstract: The present invention relates to toner compositions containing: toner particles made of: binder resin; colorant; and a wax which is dispersed in the toner particles, where the toner composition satisfies relationship (2): B?394?400A? when 0.950<A??0.965 (2) where A? represents an average circularity of the toner composition, B represents a content of toner particles having a particle diameter not greater than 3 ?m expressed in % by number, and a concentration of the wax at a surface of the toner particles is larger than a concentration thereof in the center of the toner particles.Type: GrantFiled: April 7, 2010Date of Patent: September 18, 2012Assignee: Ricoh Company, Ltd.Inventors: Hiroto Higuchi, Fumihiro Sasaki, Shinichiro Yagi, Shigeru Emoto, Junichi Awamura, Naohito Shimota, Masami Tomita, Toshiki Nanya, Takahiro Honda, Maiko Kondo
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Patent number: 8227164Abstract: A toner, including a colorant; a binder resin; a release agent; and a fixing supplemental component, wherein the toner has a storage elastic modulus G? (Pa) satisfying the following conditions: 5.0×104<G?<5.0×105 at 80° C. 1.0×104<G?<1.0×105 at 90° C. 5.0×103<G?<5.0×104 at 100° C. 1.0×103<G?<1.0×104 at 120° C. 1.0×103<G?<1.0×104 at 150° C.Type: GrantFiled: May 11, 2010Date of Patent: July 24, 2012Assignee: Ricoh Company, LimitedInventors: Tsuyoshi Sugimoto, Naohito Shimota, Hiroshi Yamashita, Satoshi Ogawa, Masana Shiba, Junichi Awamura, Tsuneyasu Nagatomo, Masaki Watanabe
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Patent number: 8192911Abstract: A method of manufacturing a toner including dispersing a binder resin, a coloring agent and a releasing agent in an organic solvent to obtain an oil phase; dispersing the oil phase in an aqueous medium with a shearing force to obtain a dispersion emulsion; wherein the shearing force is made by a screen or vessel that is situated around a rotor, the screen spinning in a direction opposite to the direction that the rotor spins. Toner produced. Method of using the toner.Type: GrantFiled: May 8, 2009Date of Patent: June 5, 2012Assignee: Ricoh Company, Ltd.Inventors: Junichi Awamura, Akinori Saitoh, Osamu Uchinokura, Masahide Yamada, Tomomi Suzuki
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Patent number: 8187785Abstract: A method of manufacturing the toner comprising dispersing at least one of a binder resin or a precursor thereof, a coloring agent and a releasing agent in an organic solvent to obtain an oil phase, dispersing the oil phase in an aqueous medium with a shearing force to obtain a dispersion emulsion, wherein the dispersion emulsion process has plural stages and the shear speed A of the emulsification process of stage n is faster than the shear speed B of the emulsification process of stage n+1.Type: GrantFiled: April 23, 2009Date of Patent: May 29, 2012Assignee: Ricoh Company, Ltd.Inventors: Junichi Awamura, Akinori Saitoh, Osamu Uchinokura, Tomomi Suzuki
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Patent number: 8178276Abstract: A method of manufacturing a toner including granulating mother toner particles in an aqueous medium to obtain a slurry containing the mother toner particles and adjusting a size distribution of the mother toner particles by screening coarse mother toner particles from the slurry with a screen to obtain the toner containing mother toner particulates.Type: GrantFiled: March 6, 2009Date of Patent: May 15, 2012Assignee: Ricoh Company LimitedInventors: Osamu Uchinokura, Akinori Saitoh, Junichi Awamura, Masahide Yamada, Hiroshi Yamada
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Publication number: 20120064445Abstract: A toner which contains: toner base particles having Dv of 4.0-6.0 ?m; and two or more additives on surfaces of the toner base particles, where the additives contains Additives A and B, wherein the toner base particles are obtained by the method containing: dispersing, in an aqueous medium, an oil phase in which at least one of a crystalline polyester resin and a non-crystalline polyester resin is contained in an organic solvent, to prepare a dispersion liquid; and removing the organic solvent from the dispersion liquid, and wherein the Additive A has the largest average primary particle diameter in the additives and has CA of 5-10% where the CA is determined by the formula A, and the Additive B has the smallest average primary particle diameter in the additives and has CB of 45-100% where the CB is determined by the formula B.Type: ApplicationFiled: September 12, 2011Publication date: March 15, 2012Inventors: Satoshi KOJIMA, Syouko Satoh, Osamu Uchinokura, Satoshi Ogawa, Junichi Awamura, Tsuyoshi Sugimoto, Teruki Kusahara, Daisuke Ito, Daisuke Inoue, Mamoru Hozumi, Koshi Sato
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Patent number: 8124308Abstract: Toner and a developer which are excellent in cleaning property and fixing property at low temperature, and capable of forming images with high quality are provided, along with a method for their production. A toner producing method involves dispersing and/or emulsifying an oil phase or a monomer phase containing a toner composition and/or a toner composition precursor in a water-based medium to granulate, wherein the toner has an average circularity of 0.925 to 0.970, and the toner composition and/or the toner composition precursor has a layered inorganic material in which at least a part of interlayer ions in the layered inorganic material has been exchanged with organic ions.Type: GrantFiled: December 13, 2010Date of Patent: February 28, 2012Assignee: Ricoh Company. Ltd.Inventors: Naohiro Watanabe, Shigeru Emoto, Yohichiroh Watanabe, Masahide Yamada, Tsunemi Sugiyama, Masahiro Ohki, Akinori Saitoh, Ryota Inoue, Osamu Uchinokura, Junichi Awamura
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Patent number: 8114560Abstract: The present invention provides a toner containing at least a binder resin, a releasing agent, and a colorant, wherein the binder resin contains at least a polyester resin (A) having a softening point Tm (A) of 120° C. to 160° C., a polyester resin (B) having a softening point Tm (B) of 80° C. or more and less than 120° C. and a composite resin (C) containing a condensation polymerization monomer and an addition polymerization monomer, at least any one of the polyester resins (A) and (B) is a polyester resin prepared by condensation-polymerizing an alcohol component substantially composed of only aliphatic alcohol with a carboxylic acid component, and 65% or more of the alcohol component is 1,2-propanediol.Type: GrantFiled: May 9, 2008Date of Patent: February 14, 2012Assignee: Ricoh Company, Ltd.Inventors: Shinya Nakayama, Akihiro Kotsugai, Akiyoshi Sabu, Hiroshi Yamashita, Hiroshi Yamada, Junichi Awamura, Tsuyoshi Sugimoto
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Publication number: 20110305986Abstract: A toner containing a binder resin, a colorant, and a releasing agent, wherein the colorant contains a mixed crystal of a C. I. PIGMENT YELLOW 185 and a C. I. PIGMENT YELLOW 139, and wherein a mass ratio of the C. I. PIGMENT YELLOW 185 to the C. I. PIGMENT YELLOW 139 (mass of the C. I. PIGMENT YELLOW 185/mass of the C. I. PIGMENT YELLOW 139) in the toner is 95/5 to 50/50.Type: ApplicationFiled: June 14, 2011Publication date: December 15, 2011Inventors: Satoshi OGAWA, Daisuke Inoue, Daisuke Ito, Osamu Uchinokura, Junichi Awamura, Teruki Kusahara, Satoshi Kojima, Mamoru Hozumi, Shoko Sato
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Publication number: 20110262856Abstract: A toner including a binder resin which contains a crystalline polyester resin and a non-crystalline polyester resin, wherein the crystalline polyester resin has at least two diffraction peaks in a range of 20°<2?<25° as detected by X-ray diffraction measurement, and has a melting point which is 60° C. or higher but lower than 80° C., and wherein the diffraction peaks each have a half width which is less than 1.0°.Type: ApplicationFiled: April 14, 2011Publication date: October 27, 2011Inventors: Tsuyoshi SUGIMOTO, Osamu Uchinokura, Satoshi Ogawa, Junichi Awamura, Satoshi Kojima, Daisuke Ito, Teruki Kusahara, Daisuke Inoue, Mamoru Hozumi, Shoko Sato
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Patent number: 8026031Abstract: Toner and a developer which are excellent in cleaning property and fixing property at low temperature, and capable of forming images with high quality are provided. A toner prepared by dispersing and/or emulsifying an oil phase or a monomer phase comprising a toner composition and/or a toner composition precursor in a water-based medium to granulate, wherein the toner has an average circularity of 0.925 to 0.970, and the toner composition and/or the toner composition precursor has a layered inorganic material in which at least a part of interlayer ions in the layered inorganic material has been exchanged with organic ions.Type: GrantFiled: March 5, 2007Date of Patent: September 27, 2011Assignee: Ricoh Company, Ltd.Inventors: Naohiro Watanabe, Shigeru Emoto, Yohichiroh Watanabe, Masahide Yamada, Tsunemi Sugiyama, Masahiro Ohki, Akinori Saitoh, Ryota Inoue, Osamu Uchinokura, Junichi Awamura
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Publication number: 20110223532Abstract: A toner, comprising a colorant, a crystalline polyester resin, and an amorphous polyester resin, in which the crystalline polyester resin satisfies the following relations: 60?(T2-cp)<80 (T2-cs2)?(T2-cp)<10 (T2-cp)?(T2-cs1)<10 wherein (T2-cp) (° C.) represents an endothermic peak temperature, (T2-cs1) (° C.) represents a first endothermic shoulder temperature, and (T2-cs2) (° C.) represents a second endothermic shoulder temperature, each determined from a second heating in a differential scanning calorimetry.Type: ApplicationFiled: February 11, 2011Publication date: September 15, 2011Inventors: Tsuyoshi SUGIMOTO, Fumihiro Sasaki, Hiroshi Yamashita, Satoshi Ogawa, Junichi Awamura, Hyo Shu, Tomomi Suzuki, Teruki Kusahara, Ryota Inoue, Daisuke Inoue