Patents by Inventor Hisakazu Tajima
Hisakazu Tajima 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: 11392051Abstract: An image forming method includes: forming a toner image on a print medium by using a toner including toner particles having a binder resin which contains a condensate of straight-chain diol having 2 to 6 carbon atoms, an alkylene oxide adduct of bisphenol A and polyvalent carboxylic acid; and applying, to the toner image, a fixing solution containing an ester-based softening agent having a boiling point of not less than 180° C. so as to fix the toner image to the print medium.Type: GrantFiled: June 17, 2020Date of Patent: July 19, 2022Assignee: BROTHER KOGYO KABUSHIKI KAISHAInventors: Takayuki Higuchi, Tatsuya Ezaka, Norihiro Hirai, Hisakazu Tajima
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Patent number: 11333990Abstract: An image forming method includes: forming a toner image on a print medium by using a toner including toner particles having a binder resin which contains a condensate of straight-chain diol having 2 to 6 carbon atoms, an alkylene oxide adduct of bisphenol A and polyvalent carboxylic acid; and applying, to the toner image, a fixing solution containing an ester-based softening agent having a boiling point of not less than 180° C. so as to fix the toner image to the print medium.Type: GrantFiled: June 17, 2020Date of Patent: May 17, 2022Assignee: BROTHER KOGYO KABUSHIKI KAISHAInventors: Takayuki Higuchi, Tatsuya Ezaka, Norihiro Hirai, Hisakazu Tajima
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Publication number: 20200310272Abstract: An image forming method includes: forming a toner image on a print medium by using a toner including toner particles having a binder resin which contains a condensate of straight-chain diol having 2 to 6 carbon atoms, an alkylene oxide adduct of bisphenol A and polyvalent carboxylic acid; and applying, to the toner image, a fixing solution containing an ester-based softening agent having a boiling point of not less than 180° C. so as to fix the toner image to the print medium.Type: ApplicationFiled: June 17, 2020Publication date: October 1, 2020Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Takayuki HIGUCHI, Tatsuya EZAKA, Norihiro HIRAI, Hisakazu TAJIMA
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Patent number: 9383671Abstract: A toner containing a resin binder, a releasing agent, and a charge control agent, wherein the resin binder contains a polyester (A) obtained by polycondensing a carboxylic acid component containing one or more succinic acid derivatives selected from succinic acids substituted with an alkyl group having 8 or more carbon atoms and 20 or less carbon atoms and succinic acids substituted with an alkenyl group having 8 or more carbon atoms and 20 or less carbon atoms, and an alcohol component, a content of the succinic acid derivative being 10% by mol or more and 30% by mol or less of a total amount of the raw material monomers of all the polyesters in the resin binder, and wherein the releasing agent contains an ?-olefin based polymer obtained by polymerizing monomers containing an ?-olefin having 26 or more carbon atoms and 28 or less carbon atoms in an amount of 95% by mol or more, a content of the ?-olefin based polymer being 0.Type: GrantFiled: July 28, 2014Date of Patent: July 5, 2016Assignee: Kao CorporationInventor: Hisakazu Tajima
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Publication number: 20150072284Abstract: A toner containing a resin binder, a releasing agent, and a charge control agent, wherein the resin binder contains a polyester (A) obtained by polycondensing a carboxylic acid component containing one or more succinic acid derivatives selected from succinic acids substituted with an alkyl group having 8 or more carbon atoms and 20 or less carbon atoms and succinic acids substituted with an alkenyl group having 8 or more carbon atoms and 20 or less carbon atoms, and an alcohol component, a content of the succinic acid derivative being 10% by mol or more and 30% by mol or less of a total amount of the raw material monomers of all the polyesters in the resin binder, and wherein the releasing agent contains an ?-olefin based polymer obtained by polymerizing monomers containing an ?-olefin having 26 or more carbon atoms and 28 or less carbon atoms in an amount of 95% by mol or more, a content of the ?-olefin based polymer being 0.Type: ApplicationFiled: July 28, 2014Publication date: March 12, 2015Applicant: KAO CORPORATIONInventor: Hisakazu TAJIMA
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Patent number: 8221949Abstract: A toner containing a resin binder containing two kinds of polyesters having softening points that differ by 10° C. or more, a colorant and a charge control agent, wherein the two kinds of polyesters contain a polyester A having a softening point of from 105° to 140° C. and a glass transition temperature of from 30° to 55° C., and a polyester B having a softening point of from 140° to 170° C. and a glass transition temperature of exceeding 55° C. and 80° C. or lower. The toner of the present invention is usable in, for example, development of latent images formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: November 16, 2009Date of Patent: July 17, 2012Assignee: Kao CorporationInventors: Hisakazu Tajima, Kohei Katayama, Eiji Shirai, Akihiro Eida
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Publication number: 20100136469Abstract: A toner containing a resin binder containing two kinds of polyesters having softening points that differ by 10° C. or more, a colorant and a charge control agent, wherein the two kinds of polyesters contain a polyester A having a softening point of from 105° to 140° C. and a glass transition temperature of from 30° to 55° C., and a polyester B having a softening point of from 140° to 170° C. and a glass transition temperature of exceeding 55° C. and 80° C. or lower. The toner of the present invention is usable in, for example, development of latent images formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: November 16, 2009Publication date: June 3, 2010Applicant: KAO CORPORATIONInventors: Hisakazu TAJIMA, Kohei Katayama, Eiji Shirai, Akihiro Eida
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Patent number: 7183032Abstract: A toner for electrostatic image development, containing a resin binder containing a polyester, a colorant, and a releasing agent containing an ester wax and a petroleum wax; and a process for preparing a toner for electrostatic image development, including the step of melt-kneading raw materials for the above toner, wherein the melt-kneading step is carried out with an open-roller type kneader. The toner for electrostatic image development is used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: May 21, 2004Date of Patent: February 27, 2007Assignee: Kao CorporationInventors: Yasuhiro Hidaka, Hisakazu Tajima
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Patent number: 6946202Abstract: A combination of powder coatings usable in a powder coating method for forming a coating film having visually homogeneous hue by mixing two or more powder coatings of which each color is different. In the combination of powder coatings, each of differences in triboelectric charges of two or more powder coatings is 5.0 ?C/g or less. The coating method usable herein includes the step of applying onto a substrate to be coated two or more powder coatings of which each color is different, in which the triboelectric charges are controlled in the above given ranges.Type: GrantFiled: March 12, 1997Date of Patent: September 20, 2005Assignee: Nippon Paint Co., Ltd.Inventors: Masayuki Maruta, Yukiya Sato, Katsutoshi Aoki, Yasunori Inagaki, Kuniyasu Kawabe, Hisakazu Tajima, Shinji Moriyama
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Publication number: 20040241564Abstract: A toner for electrostatic image development, containing a resin binder containing a polyester, a colorant, and a releasing agent containing an ester wax and a petroleum wax; and a process for preparing a toner for electrostatic image development, including the step of melt-kneading raw materials for the above toner, wherein the melt-kneading step is carried out with an open-roller type kneader. The toner for electrostatic image development is used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: May 21, 2004Publication date: December 2, 2004Applicant: KAO CORPORATIONInventors: Yasuhiro Hidaka, Hisakazu Tajima
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Publication number: 20030105244Abstract: The combination of powder coatings usable in a coating method comprising mixing two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogenous hue. A powder coating composition comprising two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogenous hue. A coating method comprising the steps of (a) applying to a substrate two or more powder coatings, of which each color is different; (b) heating to fuse with each other each of the two or more powder coatings applied in step (a); and (c) curing the resulting fused product in step (b), to give a coating film having a homogeneous hue.Type: ApplicationFiled: September 23, 2002Publication date: June 5, 2003Applicant: Nippon Paint Co., Ltd.Inventors: Yukiya Sato, Hisakazu Tajima, Katsutoshi Aoki, Takehiko Tohjo, Yasunori Inagaki, Masayuki Maruta, Shingo Tanaka
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Patent number: 6538074Abstract: The combination of powder coatings usable in a coating method comprising mixing two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogenous hue. A powder coating composition comprising two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogenous hue. A coating method comprising the steps of (a) applying to a substrate two or more powder coatings, of which each color is different; (b) heating to fuse with each other each of the two or more powder coatings applied in step (a); and (c) curing the resulting fused product in step (b), to give a coating film having a homogeneous hue.Type: GrantFiled: May 30, 2000Date of Patent: March 25, 2003Assignee: Nippon Paint Co., Ltd.Inventors: Yukiya Sato, Hisakazu Tajima, Katsutoshi Aoki, Takehiko Tohjo, Yasunori Inagaki, Masayuki Maruta, Shingo Tanaka
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Patent number: 6207768Abstract: The combination of powder coatings usable in a coating method comprising mixing two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogeneous hue. A powder coating composition comprising two or more powder coatings of which each color is different, wherein each of the powder coatings fuses with each other and is heat-cured, to thereby give a coating film having a homogeneous hue. A coating method comprising the steps of (a) applying to a substrate two or more powder coatings, of which each color is different; (b) heating to fuse with each other each of the two or more powder coatings applied in step (a); and (c) curing the resulting fused product in step (b), to give a coating film having a homogeneous hue.Type: GrantFiled: November 25, 1997Date of Patent: March 27, 2001Assignee: Kao CorporationInventors: Yukiya Sato, Hisakazu Tajima, Katsutoshi Aoki, Takehiko Tohjo, Yasunori Inagaki, Masayuki Maruta, Shingo Tanaka
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Patent number: 6121408Abstract: The powder coating for use in a coating method which includes the steps of mixing and applying two or more powder coatings to a substrate, the powder coating comprising a resin not having thermosetting properties at a temperature of 160.degree. C. or less by itself, and being heat-cured at a temperature of 160.degree. C. or less when used in combination with other powder coatings. The powder coating composition comprising two or more powder coatings, wherein each of the powder coatings comprises a resin not having thermosetting properties at a temperature of 160.degree. C. or less by itself, and being heat-cured at a temperature of 160.degree. C. or less to form a coating film when used in combination with other powder coatings.Type: GrantFiled: April 7, 1998Date of Patent: September 19, 2000Assignee: Kao CorporationInventors: Katsutoshi Aoki, Masayuki Maruta, Yukiya Sato, Hisakazu Tajima, Takehiko Tohjo, Yasunori Inagaki, Shingo Tanaka
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Patent number: 5858596Abstract: The developer composition for electrostatic latent images includes a toner and a carrier, the toner including (a) a binder resin comprising a polyester resin having an acid value of from 0 to 10 KOH mg/g; (b) a wax; and (c) a colorant. In the developer composition, the wax is dispersed in the toner with a length to diameter ratio of from 2 to 15.Type: GrantFiled: June 26, 1996Date of Patent: January 12, 1999Assignee: Kao CorporationInventors: Hisakazu Tajima, Yukiya Sato, Masayuki Maruta, Atsushi Sonobe
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Patent number: 5397668Abstract: A developer composition comprising a carrier, whose surface layer comprises a silicone resin having a urethane bond, and a toner, which is little affected by environmental factors, so that it can develop good electrostatic latent images even under low-temperature and low-humidity conditions and under high-temperature and high-humidity conditions, to give high-quality prints.Type: GrantFiled: July 12, 1993Date of Patent: March 14, 1995Assignee: Kao CorporationInventors: Yukiya Sato, Hisakazu Tajima, Yoshihiro Ueno, Kouji Kameyama, Masayoshi Nawa
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Patent number: 5097073Abstract: Disclosed is a process for preparing an unsaturated aliphatic primary or secondary amine from the corresponding unsaturated aliphatic nitrile without hydrogenating an olefinic bond in the molecule. The process employs a catalyst which is a combination of copper and a specific metal.Type: GrantFiled: June 12, 1991Date of Patent: March 17, 1992Assignee: Kao CorporationInventors: Hiroshi Abe, Tohru Katoh, Hisakazu Tajima, Kohshiro Sotoya