Patents by Inventor Masaya Oota
Masaya Oota 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: 8974998Abstract: A method of forming an image including an electrophotographic photoreceptor and a toner, wherein a photosensitive layer in the electrophotographic photoreceptor includes an undercoat layer including metal oxide particles, a charge generation layer including hydroxygallium phthalocyanine, and a charge transport layer, and the toner contains toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies—0.0517EXP(22.4/Dv50)?Dns?0.233EXP(17.3/Dv50) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.Type: GrantFiled: September 14, 2011Date of Patent: March 10, 2015Assignee: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Patent number: 8871413Abstract: An object of the invention is to provide a toner which is effective in improving image quality while inhibiting white-background fouling, residual-image phenomenon (ghost), blurring (suitability for solid printing), and the like that occur depending on the proportion of a fine powder having a particle diameter not larger than a specific value, and which has satisfactory removability in cleaning, mitigates problems concerning fouling, etc. in long-term use even on a high-speed printer, and attains excellent image stability. Another object is to provide an image-forming apparatus and a toner cartridge each employing the toner. The invention provides a toner for electrostatic-image development satisfying all of the following (1) to (4) or a toner for electrostatic-image development which is a toner containing a charge control agent and satisfying all of the following (5) to (7). The invention further provides an image-forming apparatus and a toner cartridge each employing the toner.Type: GrantFiled: September 19, 2008Date of Patent: October 28, 2014Assignee: Mitsubishi Chemical CorporationInventors: Yuzo Kaneko, Masaya Oota, Shiho Sano, Masakazu Sugihara, Teruki Senokuchi, Shiro Yasutomi, Takeshi Owada, Yumi Hirabaru, Takuya Nishikiori, Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura
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Patent number: 8741530Abstract: A method of forming an image on a substrate with an electrophotographic photoreceptor and a toner, a photosensitive layer of the electrophotographic photoreceptor contains a resin having a structural unit represented by the following formula (A) the toner containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies following formula (1) Dns?0.233EXP(17.3/Dv50)??(1).Type: GrantFiled: November 21, 2012Date of Patent: June 3, 2014Assignee: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuchi, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20130309604Abstract: An image-forming apparatus including an electrophotographic photoreceptor of which photosensitive layer contains oxytitanium phthalocyanine showing main diffraction peaks at Bragg angles (2?) of 9.0° and 27.2° and at least one main diffraction peak in the range of 9.3° to 9.8° to CuK? rays, and the toner satisfies all the following requirements (1) to (3): (1) the volume median diameter (Dv50) is 4.0 ?m or more and 7.0 ?m or less, (2) the average sphericity is 0.93 or more, and (3) the relation between the volume median diameter (Dv50) and the content (% by number: Dns) of toner particles of 2.00 ?m or more and 3.56 ?m or less satisfies Dns?0.233EXP(17.3/Dv50).Type: ApplicationFiled: July 2, 2013Publication date: November 21, 2013Applicant: Mitsubishi Chemical CorporationInventors: Mitsuo WADA, Teruyuki Mitsumori, Hiroaki Takamura, Masaya Oota, Teruki Senokuchi, Shiho Sano, Masakazu Sugihara, Shiro Yasutomi, Yumi Hirabaru, Takeshi Oowada
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Patent number: 8283097Abstract: To provide a process for efficiently producing a toner for developing an electrostatic charge image, which is scarcely susceptible to aggregation of the toner and free from blocking during the storage or from soiling the image forming apparatus and which is excellent in image characteristics. A process for producing a toner for developing an electrostatic charge image, characterized by supplying a monomer into a dispersion containing wax and a polymerizable monomer having a C8-100 hydrocarbon group, carrying out the polymerization, followed by flocculation treatment.Type: GrantFiled: November 21, 2005Date of Patent: October 9, 2012Assignee: Mitsubishi Chemical CorporationInventors: Masatoshi Maruyama, Hiroya Kodama, Masaya Oota, Shiho Sano
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Patent number: 8221950Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.3/Dv50)??(1).Type: GrantFiled: August 3, 2010Date of Patent: July 17, 2012Assignee: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Patent number: 8211602Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.3/Dv50)??(1).Type: GrantFiled: August 3, 2010Date of Patent: July 3, 2012Assignee: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20120045246Abstract: An image forming apparatus containing an electrophotographic photoreceptor and a toner for developing an electrostatic charge image, where the electrophotographic photoreceptor has an undercoat layer containing metal oxide particles; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233EXP(17.3/Dv50)??(1) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.Type: ApplicationFiled: September 14, 2011Publication date: February 23, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki MITSUMORI, Kozo ISHIO, Hiroaki TAKAMURA, Masaya OOTA, Shiho SANO, Takeshi OOWADA, Masakazu SUGIHARA, Teruki SENOKUTI, Shiro YASUTOMI, Yumi HIRABARU
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Publication number: 20120039630Abstract: An image forming apparatus containing an electrophotographic photoreceptor and a toner for developing an electrostatic charge image, where the electrophotographic photoreceptor has an electroconductive substrate with a surface roughness Ra of from 0.01 ?m to 0.3 ?m; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies formula (1): Dns?0.233EXP(17.3/Dv50)??(1) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.Type: ApplicationFiled: September 20, 2011Publication date: February 16, 2012Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20110038650Abstract: An object of the invention is to provide a toner which is effective in improving image quality while inhibiting white-background fouling, residual-image phenomenon (ghost), blurring (suitability for solid printing), and the like that occur depending on the proportion of a fine powder having a particle diameter not larger than a specific value, and which has satisfactory removability in cleaning, mitigates problems concerning fouling, etc. in long-term use even on a high-speed printer, and attains excellent image stability. Another object is to provide an image-forming apparatus and a toner cartridge each employing the toner. The invention provides a toner for electrostatic-image development satisfying all of the following (1) to (4) or a toner for electrostatic-image development which is a toner containing a charge control agent and satisfying all of the following (5) to (7). The invention further provides an image-forming apparatus and a toner cartridge each employing the toner.Type: ApplicationFiled: September 19, 2008Publication date: February 17, 2011Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Yuzo Kaneko, Masaya Oota, Shiho Sano, Masakazu Sugihara, Teruki Senokuchi, Shiro Yasutomi, Takeshi Owada, Yumi Hirabaru, Takuya Nishikiori, Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura
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Publication number: 20100316412Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.Type: ApplicationFiled: August 3, 2010Publication date: December 16, 2010Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki MITSUMORI, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20100316411Abstract: An image forming apparatus comprising an electrophotographic photoreceptor having a photosensitive layer on an electroconductive substrate, and a toner for developing an electrostatic charge image, wherein the photosensitive layer of the electrophotographic photoreceptor contains a phthalocyanine obtained via an acid paste step; the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233 EXP(17.Type: ApplicationFiled: August 3, 2010Publication date: December 16, 2010Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki MITSUMORI, Kozo ISHIO, Hiroaki TAKAMURA, Masaya OOTA, Shiho SANO, Takeshi OOWADA, Masakazu SUGIHARA, Teruki SENOKUTI, Shiro YASUTOMI, Yumi HIRABARU
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Publication number: 20100183330Abstract: Provided is an image-forming apparatus and a cartridge that are low in occurrence of smears in white areas, residual images, scattering, lines, thin spots, and dead dots, which are caused by particle size distribution of a toner and mismatching of a toner and a photoreceptor, exhibit satisfactory image quality, thin-line reproducibility, and cleaning properties, and can form high-resolution images without smears after long-time operation and selective development even in a high speed printing. The image-forming apparatus includes an electrophotographic photoreceptor of which photosensitive layer contains oxytitanium phthalocyanine showing main diffraction peaks at Bragg angles (2?) of 9.0° and 27.2° and at least one main diffraction peak in the range of 9.3° to 9.8° to CuK? rays, and the toner satisfies all the following requirements (1) to (3): (1) the volume median diameter (Dv50) is 4.0 ?m or more and 7.0 ?m or less, (2) the average sphericity is 0.Type: ApplicationFiled: June 12, 2008Publication date: July 22, 2010Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Mitsuo Wada, Teruyuki Mitsumori, Hiroaki Takamura, Masaya Oota, Teruki Senokuchi, Shiho Sano, Masakazu Sugihara, Shiro Yasutomi, Yumi Hirabaru, Takeshi Oowada
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Publication number: 20090291379Abstract: To provide toner which is capable of suppressing consuming amount of toner and preventing cleaning failure, and even when a high speed printing machine is used, can reduce a problem of e.g. fogging in a long-term use and is excellent in image stability. A toner for developing an electrostatic charge image, which comprises toner matrix particles formed in an aqueous medium, wherein the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.0 ?m; and the relationship between the volume median diameter (Dv50) and the percentage in number (Dns) of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m satisfies the following formula (1): Dns?0.233EXP(17.3/Dv50)??(1) where Dv50 is the volume median diameter (?m) of the toner, and Dns is the percentage in number of toner particles having a particle diameter of from 2.00 ?m to 3.56 ?m.Type: ApplicationFiled: March 30, 2007Publication date: November 26, 2009Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20090180807Abstract: To provide an image forming apparatus which is able to improve image quality while suppressing soiling of image white parts, scattering in the apparatus, streaks, fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor, and which has good cleaning properties, and even when a high speed printing machine is used, is able to reduce a problem of soiling, etc. in long-term use and provide excellent image stability.Type: ApplicationFiled: March 30, 2007Publication date: July 16, 2009Applicant: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20090053634Abstract: To provide a toner excellent in the image stability, whereby the image quality can be improved while suppressing soiling of image white parts, residual images (ghosts), fading (blotted image follow-up properties), etc., cleaning properties are good, and even when a high speed printing machine is used, it is possible to reduce a problem of soiling, etc. An image forming apparatus comprising an electrophotographic photoreceptor and a toner for developing an electrostatic charge image, wherein a photosensitive layer of the electrophotographic photoreceptor contains a resin having a structural unit represented by the following formula (A); the toner for developing an electrostatic charge image is a toner for developing an electrostatic charge image containing toner matrix particles formed in an aqueous medium; the toner has a volume median diameter (Dv50) of from 4.0 ?m to 7.Type: ApplicationFiled: March 30, 2007Publication date: February 26, 2009Applicant: Mitsubishi Chemical CorporationInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20090041500Abstract: To provide an image forming apparatus which is capable of suppressing soiling of image white parts, residual images (ghosts), fading, etc. due to non-uniformity in the particle size distribution of a toner or mismatching between a toner and a photoreceptor and which is able to improve image quality, provides good fixing properties and cleaning properties with little fogging or dot missing, presents good reproducibility of fine lines, and even when a high speed printing machine is used, can reduce a problem of e.g. soiling in a long-term use and presents excellent image stability.Type: ApplicationFiled: March 30, 2007Publication date: February 12, 2009Applicant: MITSUBISHI CHEMICAL CORPORATIONInventors: Teruyuki Mitsumori, Kozo Ishio, Hiroaki Takamura, Masaya Oota, Shiho Sano, Takeshi Oowada, Masakazu Sugihara, Teruki Senokuti, Shiro Yasutomi, Yumi Hirabaru
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Publication number: 20070298344Abstract: To provide a process for efficiently producing a toner for developing an electrostatic charge image, which is scarcely susceptible to aggregation of the toner and free from blocking during the storage or from soiling the image forming apparatus and which is excellent in image characteristics.Type: ApplicationFiled: November 21, 2005Publication date: December 27, 2007Applicant: Mitsubishi Chemical CorporatioanInventors: Masatoshi Maruyama, Hiroya Kodama, Masaya Oota, Shiho Sano