Patents by Inventor Wakashi Iida
Wakashi Iida 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: 20150268577Abstract: The present invention is a toner including a toner particle containing a binder resin and a charge control agent, wherein the binder resin includes a resin having a polyester unit with at least one aliphatic compound condensed to the terminal thereof, the at least one aliphatic compound being selected from the group consisting of aliphatic monocarboxylic acids each having 30 or more and 102 or less carbon atoms and aliphatic monoalcohols each having 30 or more and 102 or less carbon atoms; and the charge control agent includes a specific compound (a pyrazolone monoazo metal compound).Type: ApplicationFiled: March 16, 2015Publication date: September 24, 2015Inventors: Toru Takahashi, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
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Publication number: 20150241807Abstract: Provided is a magnetic carrier, including magnetic carrier particles each including: a magnetic carrier core including a magnetic material and a resin; and a resin coating layer formed on a surface of the magnetic carrier core, in which: the resin included in the magnetic carrier core has a hydroxy group; a surface portion of the magnetic carrier core includes a specific compound; and the magnetic carrier has an adsorbed moisture amount of 0.40 mass % or less when the magnetic carrier is left to stand in an environment of a temperature of 30° C. and a humidity of 80% RH for 72 hours.Type: ApplicationFiled: February 25, 2015Publication date: August 27, 2015Inventors: Nobuyoshi Sugahara, Hironori Minagawa, Yuto Onozaki, Minoru Yoshifuku, Wakashi Iida
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Publication number: 20150017581Abstract: Provided is a magnetic toner which exhibits a high degree of blackness and high tinting strength, and in which scraping of a toner carrying member surface by the magnetic toner is not caused, and image defects such as fogging and tailing are suppressed. A magnetic toner comprising a magnetic toner particle that contains a binder resin and a magnetic iron oxide particle, wherein, the number-average particle diameter of the magnetic iron oxide particle ranges from 0.05 ?m to 0.15 ?m, and a relationship between the number-average particle diameter (?m) of the magnetic iron oxide particle and the specific surface area (m2/g) of the magnetic iron oxide particle satisfies Expression (1) below. [Number?average particle diameter]×[specific surface area]?1.Type: ApplicationFiled: July 8, 2014Publication date: January 15, 2015Inventors: Naohiko Tsuchida, Wakashi Iida, Yoshihiro Ogawa, Toru Takahashi, Daisuke Tsujimoto
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Publication number: 20150004541Abstract: A toner comprising a binder resin and a wax, wherein the binder resin contains a binder resin A and a binder resin B, the binder resin A has a softening point of at least 120° C. and not more than 150° C., has a polyester unit, and has a terminal of which a first aliphatic compound having a melting point of 60° C. or more and not more than 85° C. has been condensed, and the binder resin B has a softening point of at least 80° C. and not more than 115° C., has a polyester unit, and has a terminal of which a second aliphatic compound having a melting point of 90° C. or more and not more than 120° C. has been condensed.Type: ApplicationFiled: June 19, 2014Publication date: January 1, 2015Inventors: Toru Takahashi, Yoshihiro Ogawa, Daisuke Tsujimoto, Naohiko Tsuchida, Wakashi Iida
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Publication number: 20140356781Abstract: A magnetic carrier includes resin-filled magnetic core particles including porous magnetic particles whose pores are filled with a resin, and resin coating layers on the surfaces of the resin-filled magnetic core particles. The porous magnetic particles have specific electrical properties.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Inventors: Hironori Minagawa, Wakashi Iida, Nobuyoshi Sugahara, Minoru Yoshifuku, Yuto Onozaki
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Publication number: 20140356783Abstract: There is provided a magnetic carrier having a resin coating layer formed on the surface of each of particles prepared by putting resin in the pores of porous magnetic particles, wherein (i) the surface roughness Ra of the porous magnetic particles ranges from 0.180 ?m to 0.250 ?m, (ii) the pore size ranges from 0.40 ?m to 1.00 ?m, (iii) the amount of the resin held in the pores ranges from 3.0 parts by mass to 5.5 parts by mass relative to 100 parts by mass of the porous magnetic particles, (iv) the amount of resin used for forming the coating resin layer ranges from 1.0 parts by mass to 3.0 parts by mass relative to 100 parts by mass of the porous magnetic particles, and (v) the surface roughness Ra of the magnetic carrier ranges from 0.160 ?m to 0.220 ?m.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Inventors: Minoru Yoshifuku, Wakashi Iida, Hironori Minagawa, Nobuyoshi Sugahara, Yuto Onozaki
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Publication number: 20140356782Abstract: A magnetic carrier contains a resin-filled magnetic core particle and a resin covering layer provided on a surface of the resin-filled magnetic core particle. The resin-filled magnetic core particle is a porous magnetic particle containing a resin in pores thereof. The magnetic carrier has a 50% particle diameter (D50) of 30.0 ?m or more and 80.0 ?m or less on a volume basis. An electric current flowing through the magnetic carrier at a voltage of 500 V ranges from 8.0 to 50.0 ?A. A proportion JR1 of a composition that is made up of the resin in a magnetic carrier portion of a region R1 and a proportion JR2 of the composition in a magnetic carrier portion of a region R2 satisfy the following relationship. The region R1 and the region R2 are illustrated in FIG. 1. 1.20?JR2/JR1?2.Type: ApplicationFiled: May 29, 2014Publication date: December 4, 2014Inventors: Nobuyoshi Sugahara, Hironori Minagawa, Yuto Onozaki, Minoru Yoshifuku, Wakashi Iida
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Patent number: 7816063Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: GrantFiled: February 6, 2009Date of Patent: October 19, 2010Assignee: Canon Kabushiki KaishaInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Hirohide Tanikawa, Yasuhiro Ichikawa
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Patent number: 7544457Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: GrantFiled: November 4, 2004Date of Patent: June 9, 2009Assignee: Canon Kabushiki KaishaInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Yasuhiro Ichikawa, Hirohide Tanikawa
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Publication number: 20090142683Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: ApplicationFiled: February 6, 2009Publication date: June 4, 2009Applicant: CANON KABUSHIKI KAISHAInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Yasuhiro Ichikawa, Hirohide Tanikawa
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Patent number: 7455947Abstract: The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*>87 and has a chromaticity b* satisfying the relationship of 106<b*<120.Type: GrantFiled: May 24, 2007Date of Patent: November 25, 2008Assignee: Canon Kabushiki KaishaInventors: Tetsuya Ida, Yasuhiro Ichikawa, Wakashi Iida, Yojiro Hotta, Kazuhiko Hayami, Hirohide Tanikawa
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Patent number: 7452651Abstract: In a carrier comprising carrier particles; each carrier particle comprising a carrier core and a coat layer for coating the carrier core, the carrier core has a ferrite component containing i) a metal oxide having at least one of metallic elements Mg, Li and Ca, the total-sum content of which is 10 to 40 mole % based on the whole ferrite component, and ii) a metal oxide having at least one of metallic elements Mn, Cu, Cr and Zn, the total-sum content of which is 50 to 4,000 ppm based on the whole ferrite component. The carrier has a volume distribution based 50% particle diameter (D50) of from 15.0 to 55.0 ?m and a degree of surface unevenness of from 1.05 to 1.30, and the coat layer contains particles; the particles having a number-average primary particle diameter of from 10 to 500 nm.Type: GrantFiled: November 7, 2005Date of Patent: November 18, 2008Assignee: Canon Kabushiki KaishaInventors: Yojiro Hotta, Tetsuya Ida, Wakashi Iida, Akira Hashimoto, Nozomu Komatsu, Yoshinobu Baba
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Publication number: 20070224531Abstract: The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*>87 and has a chromaticity b* satisfying the relationship of 106<b*<120.Type: ApplicationFiled: May 24, 2007Publication date: September 27, 2007Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ida, Yasuhiro Ichikawa, Wakashi Iida, Yojiro Hotta, Kazuhiko Hayami, Hirohide Tanikawa
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Patent number: 7147980Abstract: A toner having toner particles each comprising at least a binder resin, a wax, and a colorant is used in an image forming apparatus which has a fixing means comprising a belt-shaped heating member and a pressurizing member. The binder resin contains a resin formed by a reaction between an epoxy group of a vinyl resin (A) having the epoxy group and a carboxyl group of a resin (B) having at least a polyester unit and the carboxyl group. The toner has a storage elastic modulus at a temperature of 80° C. (G? 80) in the range of 1×105 to 1×108 Pa and has a storage elastic modulus at a temperature of 160° C. (G? 160) in the range of 1×101 to 1×104 Pa.Type: GrantFiled: January 9, 2004Date of Patent: December 12, 2006Assignee: Canon Kabushiki KaishaInventors: Takayuki Itakura, Takaaki Kotaki, Yasuhiro Ichikawa, Takaaki Kaya, Wakashi Iida, Hiroyuki Fujikawa, Kazuhiko Hayami, Nobuyoshi Sugahara, Yojiro Hotta
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Patent number: 7115349Abstract: Provided is toner which is excellent in developing property, transferring property, and fixing property, hardly affected by its surrounding, and has good endurance. The toner has a peak temperature of maximum endothermic peak in the range of 60 to 100° C. in an endothermic curve of differential scanning calorimetry (DSC) measurement; silica particles in the toner contain a titanium element; and the silica particles satisfy the following expressions. 0.7?(Ia1/Ib1)?2.0 0.7?(Ia2/Ib2)?2.0 where Ia1 represents a maximum intensity in the case of 2?=25.3 deg, Ib1 represents a mean intensity in the cases of 2?=25.3 deg+2.0 deg. and of 2?=25.3 deg.?2.0 deg., Ia2 represents a maximum intensity in the case of 2?=27.5 deg and Ib2 represents a mean intensity in the cases of 2?=27.5. deg+2.0 deg. and of 2?=27.5 deg.?2.0 deg.Type: GrantFiled: November 28, 2003Date of Patent: October 3, 2006Assignee: Canon Kabushiki KaishaInventors: Wakashi Iida, Kazuhiko Hayami, Takayuki Itakura, Yojiro Hotta
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Publication number: 20060127793Abstract: In a carrier comprising carrier particles; each carrier particle comprising a carrier core and a coat layer for coating the carrier core, the carrier core has a ferrite component containing i) a metal oxide having at least one of metallic elements Mg, Li and Ca, the total-sum content of which is 10 to 40 mole % based on the whole ferrite component, and ii) a metal oxide having at least one of metallic elements Mn, Cu, Cr and Zn, the total-sum content of which is 50 to 4,000 ppm based on the whole ferrite component. The carrier has a volume distribution based 50% particle diameter (D50) of from 15.0 to 55.0 ?m and a degree of surface unevenness of from 1.05 to 1.30, and the coat layer contains particles; the particles having a number-average primary particle diameter of from 10 to 500 nm.Type: ApplicationFiled: November 7, 2005Publication date: June 15, 2006Applicant: Canon Kabushiki KaishaInventors: Yojiro Hotta, Tetsuya Ida, Wakashi Iida, Akira Hashimoto, Nozomu Komatsu, Yoshinobu Baba
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Publication number: 20050106488Abstract: The present invention provides a yellow toner which is excellent in transparency of an image formed on an OHP sheet, excellent in color reproducibility even when a light-pressure fixing unit is employed, excellent in coloring power and charge property, and is reduced in occurrence of filming. The present invention also provides a yellow toner having excellent durability and capable of contributing to the simplification or miniaturization of the constitution of an image forming apparatus. The yellow toner of the invention comprises a binder resin and a colorant, the binder resin contains at least a polyester unit, and the toner in the powder state has a lightness L* satisfying the relationship of L*>87 and has a chromaticity b* satisfying the relationship of 106<b*<120.Type: ApplicationFiled: November 4, 2004Publication date: May 19, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Tetsuya Ida, Yasuhiro Ichikawa, Wakashi Iida, Yojiro Hotta, Kazuhiko Hayami, Hirohide Tanikawa
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Publication number: 20050100808Abstract: The present invention relates to a toner which has good property such as fixability, coloring power, developability, durability, and environmental stability and so on. More specifically, the present invention relates to a color toner containing at least a binder resin, a colorant, and a wax, in which: a wax concentration of an extract obtained by dispersing the toner into n-hexane at a concentration of 15 mg/cm3 at 23° C. and by subjecting the resultant dispersion to extraction treatment at 23° C. for 1 minute is in the range of 0.080 to 0.500 mg/cm3; an average circularity of particles each having a circle-equivalent diameter of 3 ?m or more in the toner is in the range of 0.925 to 0.965; and a content of the wax is in the range of 1 to 15 parts by mass with respect to 100 parts by mass of the binder resin.Type: ApplicationFiled: November 4, 2004Publication date: May 12, 2005Applicant: CANON KABUSHIKI KAISHAInventors: Akira Hashimoto, Yojiro Hotta, Wakashi Iida, Kazuhiko Hayami, Yasuhiro Ichikawa, Hirohide Tanikawa
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Patent number: 6808852Abstract: A toner characterized by improved fixing performances with no or minimum oil application is formed of: (i) a binder resin, (ii) a colorant, (iii) a hydrocarbon wax, (iv) a resin composition formed by copolymerization of a styrenic monomer together with at least one of nitrogen-containing vinyl monomers, carboxyl group-containing monomers, hydroxyl group-containing monomers and (meth)acrylate ester monomers, in the presence of a hydrocarbon unit; and (v) an organometallic compound. The binder resin (i) comprises a polyester component in a proportion of at least 60 wt. % of the binder resin. The toner has a GPC molecular weight distribution including a weight-average molecular weight (Mw) of at least 4.0×104 an a ratio Mw/Mn of at least 50 between the Mw and a number-average molecular weight (Mn).Type: GrantFiled: September 4, 2002Date of Patent: October 26, 2004Assignee: Canon Kabushiki KaishaInventors: Yojiro Hotta, Wakashi Iida, Tetsuya Ida, Takayuki Itakura, Nozomu Komatsu
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Publication number: 20040161688Abstract: A toner having toner particles each comprising at least a binder resin, a wax, and a colorant is used in an image forming apparatus which has a fixing means comprising a belt-shaped heating member and a pressurizing member. The binder resin contains a resin formed by a reaction between an epoxy group of a vinyl resin (A) having the epoxy group and a carboxyl group of a resin (B) having at least a polyester unit and the carboxyl group. The toner has a storage elastic modulus at a temperature of 80° C. (G′ 80) in the range of 1×105 to 1×108 Pa and has a storage elastic modulus at a temperature of 160° C. (G′ 160) in the range of 1×101 to 1×104 Pa.Type: ApplicationFiled: January 9, 2004Publication date: August 19, 2004Inventors: Takayuki Itakura, Takaaki Kotaki, Yasuhiro Ichikawa, Takaaki Kaya, Wakashi Iida, Hiroyuki Fujikawa, Kazuhiko Hayami, Nobuyoshi Sugahara, Yojiro Hotta