Patents by Inventor Akihiro Eida
Akihiro Eida 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: 20070287090Abstract: A toner having a BET specific surface area of from 1.5 to 3.5 m2/g, obtainable by a process including the steps of; step (1): pulverizing a toner composition containing at least a resin binder and a colorant in the presence of fine inorganic particles having an average primary particle size of from 6 to 20 nm to obtain mother toner particles having a volume-median particle size of from 3 to 8 ?m; and step (2): externally adding silica having an average primary particle size of from 25 to 60 nm to the mother toner particles obtained in the above step (1). The toner of the present invention is suitably used for, for example, developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: June 6, 2007Publication date: December 13, 2007Applicant: Kao CorporationInventor: Akihiro Eida
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Publication number: 20070003857Abstract: A process for preparing a black toner for electrophotography, including the steps of (I) melt-kneading a raw material mixture containing a resin binder and a black colorant with an open-roller type kneader; (II) cooling the melt-kneaded mixture obtained in the step (I) and pulverizing the cooled mixture; and (III) classifying the pulverized product obtained in the step (II), wherein the resulting toner has a volume-median particle size (D50v) of from 3 to 6.5 ?m, contains 5.0% by volume or less of particles having particle sizes of (1.4×D50v) ?m or more, and contains 5.0% by number or less of particles having particle sizes of (0.6×number-median particle size (D50p) ?m or less; and a black toner for electrophotography obtained by the process as defined above, wherein the toner is a toner for nonmagnetic monocomponent development. The black toner is used for development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: June 13, 2006Publication date: January 4, 2007Applicant: Kao CorporationInventors: Akihiro EIDA, Takashi Okuno
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Publication number: 20060093942Abstract: A process for preparing a toner including the steps of (I) melt-kneading a raw material mixture containing a resin binder, a colorant, and a positively chargeable charge control agent; (II) cooling the melt-kneaded mixture obtained in the step (I), and pulverizing the cooled mixture in the presence of a positively chargeable silica; and (III) classifying the pulverized product obtained in the step (II), wherein the positively chargeable silica in the step (II) is present in an amount of from 0.8 to 6 parts by weight, based on 100 parts by weight of the melt-kneaded mixture obtained in the step (I). The toner obtained according to the present invention can be used for, for example, developing a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method, or the like.Type: ApplicationFiled: October 14, 2005Publication date: May 4, 2006Applicant: Kao CorporationInventor: Akihiro Eida
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Publication number: 20060063094Abstract: A process for preparing a toner including the steps of (I) melt-kneading a raw material mixture containing a resin binder and a colorant; (II) cooling the melt-kneaded mixture obtained in the step (I) and pulverizing the cooled mixture to give a pulverized product having a volume-median particle size (D50v) of from 10 to 1000 ?m; (III) pulverizing the pulverized product obtained in the step (II) in the presence of an external additive having an average particle size of from 8 to 50 nm; and (IV) classifying the pulverized product obtained in the step (III), wherein the resulting toner has a volume-median particle size (D50v) of from 3.5 to 8 ?m, and the total amount of m kind(s) of external additive(s) in the step (III) satisfies a specified formula. The toner can be used, for instance, for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: September 19, 2005Publication date: March 23, 2006Applicant: Kao CorporationInventor: Akihiro Eida
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Publication number: 20060063090Abstract: A process for preparing a toner including the steps of (I) melt-kneading a raw material mixture containing a resin binder, a wax, and a colorant with an open-roller type kneader; (II) cooling the melt-kneaded mixture obtained in the step (I) and pulverizing the cooled mixture; and (III) classifying the pulverized product obtained in the step (II) to give a toner, wherein the wax is contained in the toner in an amount of from 2 to 15% by weight, and has a number-average particle size in the toner of 1 ?m or less, wherein the toner has a volume-median particle size (D50) of from 3.5 to 7 ?m, and a standard deviation in volume base particle size distribution of ¼ of D50 or less, and contains 5% by volume or less of particles having particle sizes of (1.4×D50) ?m or more, and 5% by number or less of particles having particle sizes of 3 ?m or less.Type: ApplicationFiled: September 16, 2005Publication date: March 23, 2006Applicant: Kao CorporationInventor: Akihiro Eida
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Publication number: 20050233237Abstract: The present invention relates to a toner for electrostatic image development, obtainable by a process including the steps of: (I) melt-kneading a raw material mixture containing a resin binder, a releasing agent, and a colorant, cooling the melt-kneaded mixture, and pulverizing the cooled mixture; and (II) further pulverizing a pulverized product obtained in the step (I) in the presence of an external additive containing a negatively chargeable inorganic oxide subjected to hydrophobic treatment and a positively chargeable inorganic oxide subjected to hydrophobic treatment, and classifying the pulverized product; and a process for preparing the toner.Type: ApplicationFiled: April 11, 2005Publication date: October 20, 2005Applicant: KAO CORPORATIONInventors: Akihiro Eida, Jun Shimizu
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Publication number: 20050233236Abstract: The present invention relates to a toner for electrostatic image development, obtainable by a process including the steps of (I) melt-kneading a raw material mixture containing a resin binder, a releasing agent, and a colorant; cooling the melt-kneaded mixture; and pulverizing the cooled mixture; and (II) further pulverizing a pulverized product obtained in the step (I) in the presence of an external additive containing at least two kinds of inorganic oxides subjected to hydrophobic treatment, having different average particle sizes from each other; and classifying the pulverized product, wherein the inorganic oxides subjected to hydrophobic treatment in the step (II) have an average particle size of 20 nm or less, and a difference in average particle size of 3 to 10 nm; and a process for preparing the toner.Type: ApplicationFiled: April 11, 2005Publication date: October 20, 2005Applicant: KAO CORPORATIONInventors: Akihiro Eida, Jun Shimizu
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Publication number: 20050233238Abstract: The present invention relates to a toner for electrostatic image development, obtainable by a process including the steps of (I) melt-kneading a raw material mixture comprising a resin binder, a releasing agent, and a colorant; cooling the melt-kneaded mixture; and pulverizing the cooled mixture; and (II) further pulverizing a pulverized product obtained in the step (II) in the presence of an external additive; and classifying the pulverized product, wherein the releasing agent in the step (I) contains a wax having a melting point of from 65° to 100° C., and wherein the external additive in the step (II) contains specified inorganic oxides. The toner of the present invention can be suitably used, for instance, for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: April 11, 2005Publication date: October 20, 2005Applicant: KAO CORPORATIONInventors: Akihiro Eida, Jun Shimizu
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Patent number: 6913864Abstract: A black toner comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals and at least one of a blue dye or pigment and a green dye or pigment. The black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: July 2, 2002Date of Patent: July 5, 2005Assignee: Kao CorporationInventors: Jun Shimizu, Akihiro Eida
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Patent number: 6660442Abstract: A nonmagnetic black toner for reversal development comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals, the composite oxide having an oil absorption per unit area of 0.07 ml/m2 or less. The nonmagnetic black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: GrantFiled: April 3, 2002Date of Patent: December 9, 2003Assignee: Kao CorporationInventors: Shinichi Sata, Akihiro Eida, Koji Shimokusa, Jun Shimizu
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Publication number: 20030017405Abstract: A black toner comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals and at least one of a blue dye or pigment and a green dye or pigment. The black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: July 2, 2002Publication date: January 23, 2003Applicant: KAO CORPORATIONInventors: Jun Shimizu, Akihiro Eida
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Patent number: 6509129Abstract: A toner for electrophotography comprising Resin (A) and Resin (B), wherein Resin (A) comprises Resin (C) and a wax dispersed therein, wherein a difference between the softening point of Resin (C) and the melting point of the wax is within 20° C., and the softening point of Resin (B) is higher than the softening point of Resin (C), which can be used for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing, toner jetting and the like.Type: GrantFiled: September 18, 2001Date of Patent: January 21, 2003Assignee: KAO CorporationInventors: Akihiro Eida, Hiroyuki Kawaji
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Publication number: 20020177059Abstract: A nonmagnetic black toner for reversal development comprising a resin binder; and a black colorant comprising a composite oxide of two or more metals, the composite oxide having an oil absorption per unit area of 0.07 ml/m2 or less. The nonmagnetic black toner can be suitably used for the development of a latent image formed in electrophotography, electrostatic recording method, electrostatic printing method or the like.Type: ApplicationFiled: April 3, 2002Publication date: November 28, 2002Inventors: Shinichi Sata, Akihiro Eida, Koji Shimokusa, Jun Shimizu
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Publication number: 20020058192Abstract: A toner for electrophotography comprising Resin (A) and Resin (B), wherein Resin (A) comprises Resin (C) and a wax dispersed therein, wherein a difference between the softening point of Resin (C) and the melting point of the wax is within 20° C., and the softening point of Resin (B) is higher than the softening point of Resin (C), which can be used for developing electrostatic latent images formed in electrophotography, electrostatic recording method, electrostatic printing, toner jetting and the like.Type: ApplicationFiled: September 18, 2001Publication date: May 16, 2002Inventors: Akihiro Eida, Hiroyuki Kawaji