Patents by Inventor Norihiro Hirai
Norihiro Hirai 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: 20220244667Abstract: An image forming method includes: forming a toner image on a sheet by using a toner including a first binder resin; and applying, to the toner image, a fixing solution capable of softening the first binder resin so as to fix the toner image to the sheet. The first binder resin is a condensate of a first alcohol component and a first carboxylic acid component. The first alcohol component contains 1,4-butanediol, and the first carboxylic acid component contains polyvalent carboxylic acid. A molar ratio of the 1,4-butanediol in the first alcohol component is not less than 30 mol %.Type: ApplicationFiled: May 12, 2020Publication date: August 4, 2022Applicant: BROTHER KOGYO KABUSHIKI KAISHAInventors: Takayuki HIGUCHI, Kumiko SAKAGUCHI, Beibei YANG, Norihiro HIRAI
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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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Publication number: 20200089139Abstract: Provided are a toner for developing electrostatic images excellent in low-temperature fusing property, gloss and carrier contamination resistance, and a wax dispersant. [1] A toner for developing electrostatic images, containing an amorphous composite resin (A), an amorphous polyester resin (B), and a wax, wherein the amorphous composite resin (A) contains a polyester resin segment which is a polycondensate of an alcohol component containing an aromatic diol and a carboxylic acid component containing an aliphatic dicarboxylic acid whose main chain has 8 or more and 14 or less carbon atoms, a vinylic resin segment of an addition polymer of a raw material monomer containing a styrenic compound, and a constitutional unit derived from a bireactive monomer, the constitutional unit bonding to the polyester resin segment and the vinylic resin segment each via a covalent bond; and has a glass transition temperature not lower than 45° C.Type: ApplicationFiled: March 22, 2018Publication date: March 19, 2020Applicant: KAO CORPORATIONInventors: Norihiro HIRAI, Tomohide YOSHIDA, Takashi KANNO
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Patent number: 9141011Abstract: A method for producing a toner for electrostatic image development including the step of melt-kneading a mixture containing a resin binder and a wax, wherein the resin binder contains an amorphous polyester (A) obtained by polycondensing an alcohol component containing an aliphatic diol (a) having 3 or 4 carbon atoms, the aliphatic diol having a hydroxyl group bonded to a secondary carbon atom, and an aliphatic diol (b) containing one or more ?,?-linear alkanediols having 2, 4, 6 or 8 carbon atoms, and a carboxylic acid component. The toner for electrostatic image development can be suitably used in, for example, the development or the like of latent image formed in an electrostatic development method, an electrostatic recording method, an electrostatic printing method, or the like.Type: GrantFiled: October 4, 2013Date of Patent: September 22, 2015Assignee: Kao CorporationInventors: Shogo Watanabe, Takeshi Ashizawa, Takashi Kubo, Norihiro Hirai
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Patent number: 9023568Abstract: A resin binder for use in a toner, containing an amorphous polyester having a furan ring; and a toner for electrophotography, containing the resin binder. The resin binder for use in a toner of the present invention is suitably used in a toner usable in development of latent images formed in electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.Type: GrantFiled: October 26, 2011Date of Patent: May 5, 2015Assignee: Kao CorporationInventors: Takashi Kubo, Osamu Yamashita, Norihiro Hirai
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Patent number: 8921022Abstract: A toner for electrostatic image development containing a resin binder and a releasing agent, wherein the resin binder contains a polyester A having a furan ring, and wherein the releasing agent contains an ester wax, and a method for producing the toner. The toner for electrostatic image development of the present invention can be suitably used in, for example, the development or the like of latent image formed in electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.Type: GrantFiled: March 11, 2013Date of Patent: December 30, 2014Assignee: Kao CorporationInventors: Takeshi Ashizawa, Shogo Watanabe, Takashi Kubo, Norihiro Hirai
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Patent number: 8852841Abstract: A method for producing a toner for electrostatic image development containing at least a resin binder and a charge control agent, including step 1: melt-kneading components containing a resin binder and a charge control agent to provide a melt-kneaded product; and step 2: pulverizing the melt-kneaded product, and classifying a pulverized product, wherein the resin binder contains a polyester A obtained by polycondensing an alcohol component containing 1,2-propanediol and a carboxylic acid component containing a rosin compound and an aliphatic dicarboxylic acid compound having 6 to 10 carbon atoms, wherein 1,2-propanediol is contained in the alcohol component of the polyester A in an amount of 85% by mol or more. The toner for electrostatic image development obtained by the method of the present invention can be suitably used in, for example, the development or the like of latent image formed in electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.Type: GrantFiled: November 30, 2012Date of Patent: October 7, 2014Assignee: Kao CorporationInventors: Takeshi Ashizawa, Shogo Watanabe, Takashi Kubo, Norihiro Hirai
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Publication number: 20140120465Abstract: A method for producing a toner for electrostatic image development including the step of melt-kneading a mixture containing a resin binder and a wax, wherein the resin binder contains an amorphous polyester (A) obtained by polycondensing an alcohol component containing an aliphatic diol (a) having 3 or 4 carbon atoms, the aliphatic diol having a hydroxyl group bonded to a secondary carbon atom, and an aliphatic diol (b) containing one or more ?,?-linear alkanediols having 2, 4, 6 or 8 carbon atoms, and a carboxylic acid component.Type: ApplicationFiled: October 4, 2013Publication date: May 1, 2014Applicant: Kao CorporationInventors: Shogo WATANABE, Takeshi ASHIZAWA, Takashi KUBO, Norihiro HIRAI
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Publication number: 20130273467Abstract: A toner for electrostatic image development containing a resin binder and a releasing agent, wherein the resin binder contains a polyester A having a furan ring, and wherein the releasing agent contains an ester wax, and a method for producing the toner. The toner for electrostatic image development of the present invention can be suitably used in, for example, the development or the like of latent image formed in electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.Type: ApplicationFiled: March 11, 2013Publication date: October 17, 2013Applicant: Kao CorporationInventors: Takeshi ASHIZAWA, Shogo Watanabe, Takashi Kubo, Norihiro Hirai
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Publication number: 20130171555Abstract: A resin binder for use in a toner, containing an amorphous polyester having a furan ring; and a toner for electrophotography, containing the resin binder. The resin binder for use in a toner of the present invention is suitably used in a toner usable in development of latent images formed in electrophotography, an electrostatic recording method, an electrostatic printing method, or the like.Type: ApplicationFiled: October 26, 2011Publication date: July 4, 2013Applicant: KAO CORPORATIONInventors: Takashi Kubo, Osamu Yamashita, Norihiro Hirai