Patents by Inventor Yosuke Iwasaki
Yosuke Iwasaki 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: 20200073264Abstract: A toner that is suppressed from deteriorating owing to its long-term use and can maintain high transferability. The toner includes: a toner particle containing an amorphous polyester serving as a binder resin and a polymer A; and inorganic fine particles, wherein the polymer A includes a graft copolymer of a polyolefin and a vinyl-based polymer unit having a carboxylate anion group, and a metal ion having a valence of 2 or more.Type: ApplicationFiled: August 26, 2019Publication date: March 5, 2020Inventors: Yosuke Iwasaki, Kenta Mitsuiki, Wakiko Katsumata, Takeshi Ohtsu, Masaharu Miura, Koh Ishigami, Takakuni Kobori, Takaho Shibata, Daisuke Yamashita, Hitoshi Sano, Ryo Nakajima, Rei Hijikawa, Yuichi Mizo
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Publication number: 20190339629Abstract: A toner comprising a toner particle including a binder resin and a crystalline polyester resin, wherein the binder resin is an amorphous polyester resin having a linear alkyl group at a molecular chain terminal; the crystalline polyester resin is a polycondensate of a diol and a dicarboxylic acid; the number of carbon atoms CaPES of the linear alkyl group, the number of carbon atoms COH of the diol, and the number of carbon atoms CAc of the dicarboxylic acid, excluding carbon that belongs to carboxyl groups, satisfy the following relationships; and a glass transition temperature of the toner as measured by a differential scanning calorimeter is from 40.0° C. to 55.0° C. 8?CaPES?20??(1) CAc/COH?3.5 and 0?|CAc?CaPES|?3??(2) COH/CAc?3.Type: ApplicationFiled: April 8, 2019Publication date: November 7, 2019Inventors: Daisuke Yamashita, Yuichi Mizo, Koh Ishigami, Masaharu Miura, Takaho Shibata, Takeshi Ohtsu, Yosuke Iwasaki, Wakiko Katsumata, Hitoshi Sano, Kenta Mitsuiki, Takakuni Kobori, Rei Hijikawa
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Patent number: 10423090Abstract: Provided is a magenta toner having a magenta toner particle containing a binder resin, a colorant, a wax, a wax dispersant, and a crystalline polyester, wherein the wax dispersant is a graft polymer in which a styrene acrylic resin is grafted to a hydrocarbon compound, and the styrene acrylic resin has a monomer unit having a saturated alicyclic group, the colorant contains C.I. Pigment Red 32, and when observing a cross-section of the magenta toner particle using a transmission electron microscope (TEM), crystals of the crystalline polyester are dispersed in the cross-section, and the number average value of maximum lengths of the crystals is 50 nm or less.Type: GrantFiled: November 29, 2018Date of Patent: September 24, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Ohtsu, Yosuke Iwasaki, Wakiko Katsumata, Koh Ishigami, Masaharu Miura, Kentaro Kamae, Kenta Mitsuiki, Ryuichiro Matsuo, Yuichi Mizo
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Publication number: 20190186044Abstract: Provided is an aluminum nitride single crystal which is easier to cut than conventional ones. The presently disclosed aluminum nitride single crystal 1 has a matrix region M constituting a matrix of the aluminum nitride single crystal, and at least one domain region D included in the matrix region M.Type: ApplicationFiled: December 21, 2016Publication date: June 20, 2019Applicant: JFE MINERAL COMPANY, LTDInventors: Yosuke IWASAKI, Keiichiro NAKAMURA
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Publication number: 20190171123Abstract: Provided is a magenta toner having a magenta toner particle containing a binder resin, a colorant, a wax, a wax dispersant, and a crystalline polyester, wherein the wax dispersant is a graft polymer in which a styrene acrylic resin is grafted to a hydrocarbon compound, and the styrene acrylic resin has a monomer unit having a saturated alicyclic group, the colorant contains C.I. Pigment Red 32, and when observing a cross-section of the magenta toner particle using a transmission electron microscope (TEM), crystals of the crystalline polyester are dispersed in the cross-section, and the number average value of maximum lengths of the crystals is 50 nm or less.Type: ApplicationFiled: November 29, 2018Publication date: June 6, 2019Inventors: Takeshi Ohtsu, Yosuke Iwasaki, Wakiko Katsumata, Koh Ishigami, Masaharu Miura, Kentaro Kamae, Kenta Mitsuiki, Ryuichiro Matsuo, Yuichi Mizo
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Patent number: 10234777Abstract: A toner is provided, which is obtained by heat treating a toner particle containing a crystalline polyester resin, an amorphous polyester resin, a hydrocarbon wax and a wax dispersant, wherein the crystalline polyester resin is a hybrid resin having crystalline polyester segments and amorphous vinyl segments, and a mass ratio of crystalline polyester segments and amorphous vinyl segments in the crystalline polyester resin (crystalline segments/amorphous segments) is 70/30 to 98/2.Type: GrantFiled: March 13, 2017Date of Patent: March 19, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Masaharu Miura, Koh Ishigami, Yuichi Mizo
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Patent number: 10216108Abstract: A toner production method including: a melt-kneading step of melt-kneading a resin composition including a binder resin, a colorant, a wax, and a wax dispersant to obtain a melt-kneaded product; and a pulverizing step of pulverizing the melt-kneaded product. Where the temperature of the melt-kneaded product at the end of the melt-kneading step is Tk (° C.), and the softening point of the wax dispersant is Tm (° C.), the relationship of ?18?[Tk?Tm]?10 is satisfied. The wax dispersant is a polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin. The styrene acrylic polymer has a monomer unit derived from ?-methylstyrene and a monomer unit derived from a cycloalkyl (meth)acrylate.Type: GrantFiled: August 10, 2017Date of Patent: February 26, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Yosuke Iwasaki, Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Wakiko Katsumata, Kenta Mitsuiki, Masaharu Miura, Koh Ishigami, Yuichi Mizo
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Patent number: 10133201Abstract: Provided is a toner including a toner particle containing an amorphous resin, a colorant, a release agent, and a crystalline resin, wherein, when ?0.01 represents the extensional viscosity of the toner at a Hencky strain at 90° C. of 0.01 and ?0.69 represents the extensional viscosity of the toner at a Hencky strain at 90° C. of 0.69, ?0.01 and ?0.69 satisfy the relationships of the following formulas (1) and (2): 3.0×104 Pa??0.01?2.0×105 Pa??formula (1) 2.0?[?0.69/?0.01].Type: GrantFiled: July 27, 2017Date of Patent: November 20, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Takeshi Ohtsu, Masaharu Miura, Koh Ishigami, Yuichi Mizo
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Publication number: 20180275540Abstract: A toner comprising a toner particle and inorganic fine particles present on the surface of the toner particle, wherein particle diameter numerical distribution of the inorganic fine particles on the toner particle surface has a peak A1 and B1 present in specific particle diameter ranges, the proportion of inorganic fine particles having a particle diameter of 5 nm to 30 nm is not more than 10 number %, after the toner has been subjected to a water wash treatment, the particle diameter numerical distribution of the of the primary particles of the inorganic fine particles on the toner particle surface has a peak A2 and B2 in specific particle diameter ranges; and HB1, which is a peak value of the peak B1, and HB2, which is a peak value of the peak B2, satisfy a specific relationship.Type: ApplicationFiled: March 13, 2018Publication date: September 27, 2018Inventors: Ryuichiro Matsuo, Masaharu Miura, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Kentaro Kamae, Takeshi Ohtsu, Koh Ishigami, Yuichi Mizo
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Patent number: 10012918Abstract: A toner having a toner particle that is produced through a step of melt-kneading a resin composition containing a binder resin, a colorant, a hydrocarbon wax, and a wax dispersing agent, cooling the obtained kneaded material, pulverizing the obtained cooled material, and heat treating the resulting resin particles, wherein the wax dispersing agent is a polymer provided by graft polymerizing a styrene-acrylic polymer onto a polypropylene, the styrene-acrylic polymer is a polymer having a monomer unit derived from a cycloalkyl (meth)acrylate, and specific relationships are satisfied where Mp(p) is the melting point (° C.) of the polypropylene and Mp(w) is the melting point (° C.) of the hydrocarbon wax.Type: GrantFiled: February 14, 2017Date of Patent: July 3, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Koh Ishigami, Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Masaharu Miura, Yuichi Mizo
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Patent number: 10012921Abstract: A toner having a toner particle containing an amorphous resin, a crystalline resin, a colorant, a release agent, and a polymer in which a styrene-acrylic polymer is graft-polymerized on a polyolefin, wherein the amorphous resin contains an amorphous polyester resin A, and the amorphous polyester resin A has a monomer unit derived from polyhydric alcohol and a monomer unit derived from polyhydric carboxylic acid, has, a particular amount of a succinic acid-derived monomer unit in the monomer unit derived from polyhydric carboxylic acid, and has, a particular amount of a monomer unit derived from a propylene oxide adduct on bisphenol A in the monomer unit derived from polyhydric alcohol; and has a particular softening point, a particular solubility parameter, and a particular peak molecular weight.Type: GrantFiled: August 21, 2017Date of Patent: July 3, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Takeshi Ohtsu, Masaharu Miura, Koh Ishigami, Yuichi Mizo
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Patent number: 9969834Abstract: A wax dispersant for a toner including a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound, and a toner including a toner particle that contains a binder resin, a wax, and a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound.Type: GrantFiled: August 23, 2016Date of Patent: May 15, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Masaharu Miura, Koh Ishigami, Yuichi Mizo, Kenta Mitsuiki
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Patent number: 9915885Abstract: The present invention provides a toner that excels in low-temperature fixability and also maintains charging performance, storability, and anti-hot offset property even in long-term image output. The toner comprising a toner particle containing an amorphous polyester resin, a crystalline polyester resin, wax, and a colorant, wherein a weight-average molecular weight (Mw) of the crystalline polyester resin is 5000 to 14,000, and the crystalline polyester resin includes 0.5 mass % to 15.0 mass % of a segment derived from one or more aliphatic compounds selected from the group consisting of aliphatic monocarboxylic acids with a carbon number of 8 to 20 and aliphatic monohydric alcohols with a carbon number of 8 to 20.Type: GrantFiled: May 2, 2016Date of Patent: March 13, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Wakiko Katsumata, Kentaro Kamae, Masaharu Miura, Takeshi Ohtsu, Koh Ishigami, Ryuichiro Matsuo, Yosuke Iwasaki, Yuichi Mizo
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Publication number: 20180059565Abstract: A toner having a toner particle containing an amorphous resin, a crystalline resin, a colorant, a release agent, and a polymer in which a styrene-acrylic polymer is graft-polymerized on a polyolefin, wherein the amorphous resin contains an amorphous polyester resin A, and the amorphous polyester resin A has a monomer unit derived from polyhydric alcohol and a monomer unit derived from polyhydric carboxylic acid, has, a particular amount of a succinic acid-derived monomer unit in the monomer unit derived from polyhydric carboxylic acid, and has, a particular amount of a monomer unit derived from a propylene oxide adduct on bisphenol A in the monomer unit derived from polyhydric alcohol; and has a particular softening point, a particular solubility parameter, and a particular peak molecular weight.Type: ApplicationFiled: August 21, 2017Publication date: March 1, 2018Inventors: Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Takeshi Ohtsu, Masaharu Miura, Koh lshigami, Yuichi Mizo
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Publication number: 20180052402Abstract: A toner production method including: a melt-kneading step of melt-kneading a resin composition including a binder resin, a colorant, a wax, and a wax dispersant to obtain a melt-kneaded product; and a pulverizing step of pulverizing the melt-kneaded product. Where the temperature of the melt-kneaded product at the end of the melt-kneading step is Tk(° C.), and the softening point of the wax dispersant is Tm(° C.), the relationship of ?18?[Tk?Tm]?10 is satisfied. The wax dispersant is a polymer in which a styrene acrylic polymer is graft-polymerized to a polyolefin. The styrene acrylic polymer has a monomer unit derived from ?-methylstyrene and a monomer unit derived from a cycloalkyl (meth)acrylate.Type: ApplicationFiled: August 10, 2017Publication date: February 22, 2018Inventors: Yosuke Iwasaki, Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Wakiko Katsumata, Kenta Mitsuiki, Masaharu Miura, Koh lshigami, Yuichi Mizo
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Publication number: 20180031990Abstract: Provided is a toner including a toner particle containing an amorphous resin, a colorant, a release agent, and a crystalline resin, wherein, when ?0.01 represents the extensional viscosity of the toner at a Hencky strain at 90° C. of 0.01 and ?0.69 represents the extensional viscosity of the toner at a Hencky strain at 90° C. of 0.69, ?0.01 and ?0.69 satisfy the relationships of the following formulas (1) and (2): 3.0×104 Pa??0.01?2.0×105 Pa??formula (1) 2.0?[?0.69/?0.01].Type: ApplicationFiled: July 27, 2017Publication date: February 1, 2018Inventors: Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Takeshi Ohtsu, Masaharu Miura, Koh Ishigami, Yuichi Mizo
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Publication number: 20170269493Abstract: A toner is provided, which is obtained by heat treating a toner particle containing a crystalline polyester resin, an amorphous polyester resin, a hydrocarbon wax and a wax dispersant, wherein the crystalline polyester resin is a hybrid resin having crystalline polyester segments and amorphous vinyl segments, and a mass ratio of crystalline polyester segments and amorphous vinyl segments in the crystalline polyester resin (crystalline segments/amorphous segments) is 70/30 to 98/2.Type: ApplicationFiled: March 13, 2017Publication date: September 21, 2017Inventors: Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Masaharu Miura, Koh Ishigami, Yuichi Mizo
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Publication number: 20170242355Abstract: A toner having a toner particle that is produced through a step of melt-kneading a resin composition containing a binder resin, a colorant, a hydrocarbon wax, and a wax dispersing agent, cooling the obtained kneaded material, pulverizing the obtained cooled material, and heat treating the resulting resin particles, wherein the wax dispersing agent is a polymer provided by graft polymerizing a styrene-acrylic polymer onto a polypropylene, the styrene-acrylic polymer is a polymer having a monomer unit derived from a cycloalkyl (meth)acrylate, and specific relationships are satisfied where Mp(p) is the melting point (° C.) of the polypropylene and Mp(w) is the melting point (° C.) of the hydrocarbon wax.Type: ApplicationFiled: February 14, 2017Publication date: August 24, 2017Inventors: Koh Ishigami, Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Kenta Mitsuiki, Masaharu Miura, Yuichi Mizo
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Patent number: 9665026Abstract: Provided are a toner and a two-component developer each of which: shows a small fluctuation in charge quantity and a small fluctuation in image density even under a high-temperature and high-humidity environment; and does not cause any member contamination even after endurance and hence can stably output an image. The toner and the two-component developer each have a feature in that positively chargeable strontium titanate fine particles are added to toner particles having fixed thereto negatively chargeable silica fine particles.Type: GrantFiled: July 27, 2016Date of Patent: May 30, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Yosuke Iwasaki, Nozomu Komatsu, Takakuni Kobori, Kohji Takenaka, Hideki Kaneko, Takeshi Hashimoto, Ichiro Kanno, Hiroyuki Fujikawa
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Publication number: 20170058067Abstract: A wax dispersant for a toner including a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound, and a toner including a toner particle that contains a binder resin, a wax, and a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound.Type: ApplicationFiled: August 23, 2016Publication date: March 2, 2017Inventors: Takeshi Ohtsu, Kentaro Kamae, Ryuichiro Matsuo, Yosuke Iwasaki, Wakiko Katsumata, Masaharu Miura, Koh Ishigami, Yuichi Mizo, Kenta Mitsuiki