Patents by Inventor Masaharu Miura
Masaharu Miura 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).
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
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
-
Patent number: 9665023Abstract: Provided is a toner, including toner particles each containing a binder resin containing a polyester ? as a main component, a colorant, a wax, and a crystalline polyester, in which: the polyester ? has a polyhydric alcohol unit and a polyvalent carboxylic acid unit; and the polyester ? has, as the polyhydric alcohol unit, a polyhydric alcohol unit N derived from an alkylene oxide adduct of a novolac type phenol resin.Type: GrantFiled: December 10, 2014Date of Patent: May 30, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Kentaro Kamae, Ryuichiro Matsuo, Koh Ishigami, Masaharu Miura, Masayuki Hama, Hiroaki Kawakami
-
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
-
Publication number: 20160334725Abstract: 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: ApplicationFiled: May 2, 2016Publication date: November 17, 2016Inventors: Wakiko Katsumata, Kentaro Kamae, Masaharu Miura, Takeshi Ohtsu, Koh Ishigami, Ryuichiro Matsuo, Yosuke Iwasaki, Yuichi Mizo
-
Publication number: 20160202621Abstract: A toner is provided, where good cleanability is exhibited, abrasion variations of the photo conductor surface is reduced, and contamination of a charge member is reduced. The toner includes toner particles and organic-inorganic composite fine particles on the toner particle surfaces, wherein each of the organic-inorganic composite fine particles is a particle in which inorganic fine particles are exposed at the surfaces of vinyl based resin particles in such a way that convex portions derived from the inorganic fine particles are formed on the surfaces, the average circularity of the toner is 0.960 or more, and the absolute value Q of the amount of triboelectricity of the toner measured by a two-component method and the electrostatic adhesion F of the toner satisfy 0.003?F/Q2?0.040.Type: ApplicationFiled: July 30, 2014Publication date: July 14, 2016Inventors: Yojiro Hotta, Shohei Tsuda, Taiji Katsura, Masaharu Miura, Yoshinobu Baba, Takayuki Itakura
-
Publication number: 20150177634Abstract: Provided is a toner, including toner particles each containing a binder resin containing a polyester ? as a main component, a colorant, a wax, and a crystalline polyester, in which: the polyester ? has a polyhydric alcohol unit and a polyvalent carboxylic acid unit; and the polyester ? has, as the polyhydric alcohol unit, a polyhydric alcohol unit N derived from an alkylene oxide adduct of a novolac type phenol resin.Type: ApplicationFiled: December 10, 2014Publication date: June 25, 2015Inventors: Kentaro Kamae, Ryuichiro Matsuo, Koh Ishigami, Masaharu Miura, Masayuki Hama, Hiroaki Kawakami
-
Patent number: 8530129Abstract: Provided is an image forming method in which hydrophobized calcium carbonate particles having a number average particle diameter of 30 to 300 nm and hydrophobized strontium titanate particles having a number average particle diameter of 30 to 300 nm are applied to the surface of an image bearing member.Type: GrantFiled: July 1, 2011Date of Patent: September 10, 2013Assignee: Canon Kabushiki KaishaInventors: Masayuki Hama, Masaya Kawada, Masaharu Miura
-
Publication number: 20120003580Abstract: Provided is an image forming method in which hydrophobized calcium carbonate particles having a number average particle diameter of 30 to 300 nm and hydrophobized strontium titanate particles having a number average particle diameter of 30 to 300 nm are applied to the surface of an image bearing member.Type: ApplicationFiled: July 1, 2011Publication date: January 5, 2012Applicant: CANON KABUSHIKI KAISHAInventors: Masayuki Hama, Masaya Kawada, Masaharu Miura