Patents by Inventor Yasushi Katsuta
Yasushi Katsuta 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: 8841056Abstract: A toner is provided which has toner particles and an inorganic fine powder; the toner particles being obtained by suspension polymerization using a specific polar resin. The toner is a toner in which; where, in displacement levels found in a micro-compression test in which a force is applied to a toner single particle at a loading rate of 9.8×10?6 N/sec to measure a displacement level (?m) at a point of time where the force has reached a maximum force of 4.90×10?4 N, the displacement level of the toner at a measurement temperature of 25° C. is represented by X(25) and the displacement level of the toner at a measurement temperature of 50° C. by X(50), and the number average particle diameter of the toner is represented by D (?m), the X(25), X(50) and D satisfies the relations: 0.10?X(25)/D?0.35??(1) 30?[X(50)?X(25)]/X(25)×100?150??(2).Type: GrantFiled: March 28, 2011Date of Patent: September 23, 2014Assignee: Canon Kabushiki KaishaInventors: Kazumi Yoshizaki, Shinya Yachi, Yasushi Katsuta, Kenichi Nakayama, Takeshi Kaburagi
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Patent number: 8828639Abstract: The invention provides a toner that is capable of low-temperature fixing even in high-speed electrophotographic processes while keeping the cleaning performance when used at high temperatures and the high-temperature storage stability. This toner having toner particles, each of which contains a binder resin and a colorant is characterized in that the temperature of Tp [° C.] when the loss elastic modulus obtained by dynamic viscoelastic measurements on the toner exhibits a maximum value in the temperature range from at least 30° C. to not more than 200° C., is from at least 40° C. to not more than 55° C., and in that, with G?(Tp) [Pa] being this maximum value, G?(Tp+15) [Pa] being the loss elastic modulus at the temperature of Tp+15 [° C.], and G?(Tp+30) [Pa] being the loss elastic modulus at the temperature of Tp+30 [° C.], G?(Tp), G?(Tp+15), and G?(Tp+30) satisfy prescribed relationships.Type: GrantFiled: October 3, 2011Date of Patent: September 9, 2014Assignee: Canon Kabushiki KaishaInventors: Kenta Kamikura, Kazumi Yoshizaki, Yasushi Katsuta, Kenichi Nakayama, Shiro Kuroki
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Publication number: 20140141366Abstract: In a toner including toner particles obtained by performing suspension polymerization using a monomer composition containing a polymerizable monomer and a polar resin and in a method for manufacturing the above toner, the polar resin satisfies the following conditions (1) to (4). (1) The polar resin is a styrene-based resin. (2) A main peak molecular weight Mp is 5,000 to 100,000. (3) When the acid value of a low molecular weight component is represented by A and the acid value of a high molecular weight component is represented by B, 0.80?A/B?1.20 is satisfied. (4) The acid value is 5.0 to 40.0 mgKOH/g.Type: ApplicationFiled: July 10, 2012Publication date: May 22, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Yasushi Katsuta, Shinya Yachi, Takeshi Shimura, Nobuhisa Abe, Kenta Kamikura
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Publication number: 20140064792Abstract: Provided are a developing unit alleviating fogging occurrence and an electrophotographic image forming apparatus providing images over long periods. The developing unit comprises at least toner (1), developing roller (2). (1) when a displacement amount when a load is applied at Y° C. and 9.8×10?5 N/sec to 2.94×10?4 N is X2(Y), a displacement amount when the toner is left to stand for 0.1 second is X3(Y), a displacement amount when the load is reduced at 9.8×10?5 N/sec to ON is X4(Y), and percentage of (X3(Y)?X4(Y)) to X3(Y) is Z(Y), 40?Z(25)?80 and 10?Z(50)?55 are satisfied; when a gradient from the origin to the maximum load in the load-displacement curve at 25° C. is R(25), 0.49×10?3?R(25)?1.70×10?3 is satisfied; the toner has glass transition temperature TgA (40° C.-60° C.) and maximum endothermic peak temperature P1 (70° C.-110° C.), 15° C.?(P1?TgA)?70° C. is satisfied. (2) developing roller comprises a surface layer containing a urethane resin having structure (a), and one or both structures (b)-(c).Type: ApplicationFiled: November 8, 2013Publication date: March 6, 2014Applicant: Canon Kabushiki KaishaInventors: Kunimasa Kawamura, Minoru Nakamura, Shohei Urushihara, Masaki Yamada, Yasushi Katsuta
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Patent number: 8518623Abstract: A toner includes a toner particle, which contains at least a binding resin, a colorant, and two types of polar resins, i.e., a polar resin H and a polar resin L, and which is obtained with granulation in a water-based medium, wherein solubility parameters, glass transition points, and weight-average molecular weights of the binding resin, the polar resin H, and the polar resin L, as well as amounts of the added resins satisfy respective specific relationships.Type: GrantFiled: March 30, 2011Date of Patent: August 27, 2013Assignee: Canon Kabushiki KasihaInventors: Kenta Kamikura, Shinya Yachi, Kazumi Yoshizaki, Yasushi Katsuta, Takeshi Kaburagi
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Publication number: 20130177845Abstract: The invention provides a toner that is capable of low-temperature fixing even in high-speed electrophotographic processes while keeping the cleaning performance when used at high temperatures and the high-temperature storage stability. This toner having toner particles, each of which contains a binder resin and a colorant is characterized in that the temperature of Tp [° C.] when the loss elastic modulus obtained by dynamic viscoelastic measurements on the toner exhibits a maximum value in the temperature range from at least 30° C. to not more than 200° C., is from at least 40° C. to not more than 55° C., and in that, with G?(Tp) [Pa] being this maximum value, G?(Tp+15) [Pa] being the loss elastic modulus at the temperature of Tp+15 [° C.], and G?(Tp+30) [Pa] being the loss elastic modulus at the temperature of Tp+30 [° C.], G?(Tp), G?(Tp+15), and G?(Tp+30) satisfy prescribed relationships.Type: ApplicationFiled: October 3, 2011Publication date: July 11, 2013Applicant: Canon Kabushiki KaishaInventors: Kenta Kamikura, Kazumi Yoshizaki, Yasushi Katsuta, Kenichi Nakayama, Shiro Kuroki
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Publication number: 20130171552Abstract: The present invention provides a toner showing an excellent fixing property even in high-speed image formation and inhibiting contamination of the inside of an apparatus and thereby being capable of stably forming high-quality images not having unevenness of gloss over a long period of time. In the toner including toner particles containing a binder resin, an ester wax, and a coloring agent, the ester wax is prescribed by, in GC/MS analysis of components volatilized by heating the wax at 200° C. for 10 minutes, a relationship in the components having carbon atoms in specific ranges.Type: ApplicationFiled: September 6, 2011Publication date: July 4, 2013Applicant: CANON KABUSHIKI KAISHAInventors: Kazumi Yoshizaki, Yasushi Katsuta, Kenichi Nakayama, Takeshi Kaburagi, Hideki Kaneko
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Publication number: 20120328979Abstract: A toner is provided which has toner particles and an inorganic fine powder; the toner particles being obtained by suspension polymerization using a specific polar resin. The toner is a toner in which; where, in displacement levels found in a micro-compression test in which a force is applied to a toner single particle at a loading rate of 9.8×10?6 N/sec to measure a displacement level (?m) at a point of time where the force has reached a maximum force of 4.90×10?4 N, the displacement level of the toner at a measurement temperature of 25° C. is represented by X(25) and the displacement level of the toner at a measurement temperature of 50° C. by X(50), and the number average particle diameter of the toner is represented by D (?m), the X(25), X(50) and D satisfies the relations: 0.10?X(25)/D?0.35??(1) 30?[X(50)?X(25)]/X(25)×100?150??(2).Type: ApplicationFiled: March 28, 2011Publication date: December 27, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Kazumi Yoshizaki, Shinya Yachi, Yasushi Katsuta, Kenichi Nakayama, Takeshi Kaburagi
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Publication number: 20110244386Abstract: A toner includes a toner particle, which contains at least a binding resin, a colorant, and two types of polar resins, i.e., a polar resin H and a polar resin L, and which is obtained with granulation in a water-based medium, wherein solubility parameters, glass transition points, and weight-average molecular weights of the binding resin, the polar resin H, and the polar resin L, as well as amounts of the added resins satisfy respective specific relationships.Type: ApplicationFiled: March 30, 2011Publication date: October 6, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Kenta Kamikura, Shinya Yachi, Kazumi Yoshizaki, Yasushi Katsuta, Takeshi Kaburagi
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Publication number: 20110103095Abstract: A light guide plate that uses a resin film as a material for the light guide plate, that has a reflecting or scattering pattern formed by printing, and that guides a light propagating in the film to exit and emerge from the front surface thereof. The light guide plate is thinner and highly flexible, and has high reliability and durability. A base material of the light guide plate is formed from a thermosetting polyurethane sheet with a thickness of 0.4 mm or less. When a dot pattern is formed by ink-jetting, a white UV curable ink, for which the thermosetting polyurethane exhibits a swellability such that the thermosetting polyurethane increases by 10% or more in weight as a result of being soaked in the ink for one hour at a room temperature, is used as the ink.Type: ApplicationFiled: March 31, 2009Publication date: May 5, 2011Applicant: Nippon Mektron, Ltd.Inventors: Kazuyuki Ozaki, Yasushi Katsuta, Takashi Iwaki, Hayato Takada
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Publication number: 20110008726Abstract: Provided is a process for producing a toner comprising steps of: dispersing a polymerizable monomer composition containing a polymerizable monomer, a polar resin, a colorant, and a wax component in a aqueous dispersion medium to granulate the polymerizable monomer composition; and polymerizing the polymerizable monomer, wherein the polymerizable monomer is a vinyl-based polymerizable monomer, the polar resin is a styrene-methacrylic acid copolymer or styrene-acrylic acid copolymer; the polymerizable monomer composition contains 0.0050 to 0.025 mass % of divinylbenzene; and the toner has a glass transition temperature (TgA) measured with a differential scanning calorimeter (DSC) of 40° C. or higher and 60° C. or lower and a peak temperature (P1) of a highest endothermic peak measured with the DSC of 70° C. or higher and 110° C. or lower, and P1 and TgA satisfy a relationship of 15° C.?(P1?TgA)?70° C.Type: ApplicationFiled: September 22, 2010Publication date: January 13, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Yasushi Katsuta, Koji Inaba, Ken-ichi Nakayama, Kenta Kamimura
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Patent number: 7846631Abstract: Provided is a toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, the toner being wherein: in a microscopic compression test on the toner, a recovery ratio Z(25) and the gradient of a load-displacement curve R(25) each satisfy a specific range; and the toner has a glass transition temperature (TgA) measured with a differential scanning calorimeter (DSC) in a specific range and a temperature (P1) of the highest endothermic peak measured with the DSC in a specific range, and the temperature (P1) of the highest endothermic peak and the glass transition temperature (TgA) satisfy a specific relationship.Type: GrantFiled: January 20, 2009Date of Patent: December 7, 2010Assignee: Canon Kabushiki KaishaInventors: Yasushi Katsuta, Koji Inaba, Ken-ichi Nakayama, Kenta Kamikura
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Patent number: 7745088Abstract: Provided is anon-magnetic toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, in which: (1) when a temperature in a temperature range of 50 to 80° C. at which a loss tangent (tan ?) shows a maximum is represented by T1, a storage elastic modulus of the toner at the temperature T1 (G?(T1)) satisfies a relationship of 5.00×107?G?(T1)?1.00×109 (dN/m2); (2) a continuous temperature range with a width of 15° C. or more in which the loss tangent (tan ?) is 0.80 to 2.00 is present in the temperature range of 50 to 80° C.; and (3) the loss tangent (tan ?) is 1.00 or more in a temperature range of 120 to 160° C.Type: GrantFiled: November 11, 2008Date of Patent: June 29, 2010Assignee: Canon Kabushiki KaishaInventors: Kazumi Yoshizaki, Koji Inaba, Yasushi Katsuta
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Patent number: 7740999Abstract: To achieve improvements in developing performance, transferring performance, and fixing performance, a toner has a glass transition temperature (TgA) of 40 to 60° C. and a temperature (P1) of the highest peak of 70 to 120° C.; cyclohexane (CHX) insoluble matter in the tetrahydrofuran (THF) soluble matter of the toner has a glass transition temperature (TgB) of 80 to 120° C.; TgA and TgB satisfy a specific formula; the toner has a viscosity at 100° C. of 5,000 to 30,000 Pa·s; and the cyclohexane (CHX) insoluble matter has an acid value of 5 to 40 mgKOH/g.Type: GrantFiled: August 5, 2008Date of Patent: June 22, 2010Assignee: Canon Kabushiki KaishaInventors: Koji Inaba, Kazumi Yoshizaki, Yasushi Katsuta
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Publication number: 20090186290Abstract: Provided is anon-magnetic toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, in which: (1) when a temperature in a temperature range of 50 to 80° C. at which a loss tangent (tan ?) shows a maximum is represented by T1, a storage elastic modulus of the toner at the temperature T1 (G?(T1)) satisfies a relationship of 5.00×107?G?(T1)?1.00×109 (dN/m2); (2) a continuous temperature range with a width of 15° C. or more in which the loss tangent (tan ?) is 0.80 to 2.00 is present in the temperature range of 50 to 80° C.; and (3) the loss tangent (tan ?) is 1.00 or more in a temperature range of 120 to 160° C.Type: ApplicationFiled: November 11, 2008Publication date: July 23, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Kazumi Yoshizaki, Koji Inaba, Yasushi Katsuta
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Patent number: 7537875Abstract: In a toner having toner particles which comprise toner base particles containing at least a colorant, a release agent and a polar resin, and an inorganic fine powder, the polar resin is a resin having at least a polyester unit, synthesized in the presence of an aromatic carboxylic acid titanium compound used as a catalyst, and has an acid value of from 3 mgKOH/g to 35 mgKOH/g. The toner base particles are obtained by carrying out granulation in an aqueous medium, and the toner has a weight-average particle diameter of from 4.0 ?m to 10.0 ?m.Type: GrantFiled: June 22, 2005Date of Patent: May 26, 2009Assignee: Canon Kabushiki KaishaInventors: Yushi Mikuriya, Satoshi Handa, Yuji Moriki, Yasushi Katsuta, Emi Tosaka
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Publication number: 20090130583Abstract: Provided is a toner including toner particles each containing at least a binder resin, a colorant, and a wax component, and an inorganic fine powder, the toner being wherein: in a microscopic compression test on the toner, a recovery ratio Z(25) and the gradient of a load-displacement curve R(25) each satisfy a specific range; and the toner has a glass transition temperature (TgA) measured with a differential scanning calorimeter (DSC) in a specific range and a temperature (P1) of the highest endothermic peak measured with the DSC in a specific range, and the temperature (P1) of the highest endothermic peak and the glass transition temperature (TgA) satisfy a specific relationship.Type: ApplicationFiled: January 20, 2009Publication date: May 21, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Yasushi Katsuta, Koji Inaba, Ken-ichi Nakayama, Kenta Kamimura
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Publication number: 20090117483Abstract: An object of the present invention is to achieve improvements in the developing performance, transferring performance, and fixing performance of toner. The object can be achieved with a toner having a glass transition temperature (TgA) of 40 to 60° C. and a temperature (P1) of the highest peak of 70 to 120° C.; cyclohexane (CHX) insoluble matter in the tetrahydrofuran (THF) soluble matter of the toner has a glass transition temperature (TgB) of 80 to 120° C.; TgA and TgB satisfy a specific formula; the toner has a viscosity at 100° C. of 5,000 to 30,000 Pa·s; and the cyclohexane (CHX) insoluble matter has an acid value of 5 to 40 mgKOH/g.Type: ApplicationFiled: August 5, 2008Publication date: May 7, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Koji Inaba, Kazumi Yoshizaki, Yasushi Katsuta
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Patent number: 7323282Abstract: The toner having a significantly improved dispersibility of a colorant in toner particles is provided. The present invention provides a dry toner comprising: (i) a binder resin; (ii) a colorant; (iii) at least one of metallophthalocyanine and a metallophthalocyanine derivative having a central metal selected from the group consisting of Cr, Fe, Co, Ni, Zn, Mn, Mg, and Al; and (iv) a polymer containing 0.5 to 20% by mass of a base unit derived from a specific polymerizable monomer having an amide group.Type: GrantFiled: June 5, 2007Date of Patent: January 29, 2008Assignee: Canon Kabushiki KaishaInventors: Manabu Ohno, Motoya Fukushima, Hitoshi Itabashi, Yasushi Katsuta, Emi Tosaka, Norikazu Fujimoto
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Publication number: 20070231729Abstract: The toner having a significantly improved dispersibility of a colorant in toner particles is provided. The present invention provides a dry toner comprising: (i) a binder resin; (ii) a colorant; (iii) at least one of metallophthalocyanine and a metallophthalocyanine derivative having a central metal selected from the group consisting of Cr, Fe, Co, Ni, Zn, Mn, Mg, and Al; and (iv) a polymer containing 0.5 to 20% by mass of a base unit derived from a specific polymerizable monomer having an amide group.Type: ApplicationFiled: June 5, 2007Publication date: October 4, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Manabu Ohno, Motoya Fukushima, Hitoshi Itabashi, Yasushi Katsuta, Emi Tosaka, Norikazu Fujimoto