Patents by Inventor Nobuyoshi Sugahara
Nobuyoshi Sugahara 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: 20230341790Abstract: A toner includes a toner particle containing a binder resin containing a crystalline polyester. In differential scanning calorimetry (DSC), the toner is heated to 180° C. at a rate of 10° C./min, then cooled to 25° C. at a rate of 10° C./min and successively from 25° C. to 15° C. at a rate of 3° C./min, and heated again to 180° C. at a rate of 10° C./min. As a result, an exothermic amount P1 when the toner is cooled from 80° C. to 40° C. is 1.00 J/g or less, an exothermic amount P2 when the toner is cooled from 25° C. to 15° C. is 0.10 J/g or more, and when a sum of endothermic amounts P3 (J/g) when the toner is heated again from 40° C. to 180° C. and a sum of exothermic amounts P4 (J/g) when the toner is cooled from 180° C. to 40° C. satisfies 2.0 ? P3-P4 ? 10.0.Type: ApplicationFiled: March 13, 2023Publication date: October 26, 2023Inventors: KENTA MITSUIKI, HISASUKE KAJIHARA, MAKI IMURA, NOBUHIRO YOSHIDA, KOHEI YOSHIYAMA, KENTARO KAMAE, YUU NISHIMURA, KAZUNARI OOYAMA, NOBUYOSHI SUGAHARA, YUYA CHIMOTO, TAKAHO SHIBATA
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Publication number: 20230305415Abstract: The present invention provides a toner including a toner particle containing a binder resin and a release agent. The binder resin contains an amorphous resin and a crystalline resin, and a content of the crystalline resin is 1.0% to 20.0% by mass based on a mass of the binder resin. In a cross-section of the toner particle observed by scanning transmission electron microscopy, (i) there exist a matrix A of the amorphous resin and domains A of the release agent dispersed in the matrix A, (ii) the domains A each include a matrix B of the release agent and domains B of the crystalline resin dispersed in the matrix B, and (iii) the domains A are each covered with the crystalline resin and an average coverage of the domains A by the crystalline resin is 70% or more.Type: ApplicationFiled: March 9, 2023Publication date: September 28, 2023Inventors: NOBUHIRO YOSHIDA, KOHEI YOSHIYAMA, MAKI IMURA, KENTA MITSUIKI, KENTARO KAMAE, YUU NISHIMURA, KAZUNARI OOYAMA, NOBUYOSHI SUGAHARA, HISASUKE KAJIHARA, YUYA CHIMOTO, TAKAHO SHIBATA
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Patent number: 11698594Abstract: A toner including a toner particle comprising a binder resin and a crystalline polyester, wherein the binder resin contains a polyester having a structure represented by the following formula (1): in formula (1), Rs each independently represent hydrogen, a methyl group, or a phenyl group; A represents a polyester segment; B represents a polyester segment or any functional group selected from the group consisting of —R1OH, —R1COOH, and —R1NH2 wherein R1 represents a single bond or a C1-4 alkylene group; and the average repeat number n is 10 to 80.Type: GrantFiled: April 6, 2021Date of Patent: July 11, 2023Assignee: CANON KABUSHIKI KAISHAInventors: Toru Takahashi, Nobuyoshi Sugahara, Hitoshi Sano, Kazunari Ooyama, Yuu Nishimura, Kohji Takenaka, Koh Ishigami
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Publication number: 20220269189Abstract: A magnetic carrier comprises a magnetic carrier core and a coating resin layer coating a surface of the magnetic carrier core. The coating resin layer contains resin A and resin B at contents of 1% to 50% by mass and 50% to 90% by mass, respectively, based on resin components of the coating resin layer. The resin A has a first partial structure and a second partial structure, while the resin B has a third partial structure and a fourth partial structure. The mass X of the resin A, the total mass Ma of the first partial structure, and the total mass Mb of the second partial structure satisfy 0.50?(Ma+Mb)/X?1.00 and 0.10?a/b?30.0, and the SP value of the first partial structure SPa1 and the SP value of the third partial structure SPb3 satisfy 0?|SPa1—SPb3|?10.0.Type: ApplicationFiled: February 7, 2022Publication date: August 25, 2022Inventors: Yuu Nishimura, Yuzo Tokunaga, Nobuyoshi Sugahara, Hironori Minagawa, Nobuhiro Yoshida
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Publication number: 20220236659Abstract: A magnetic carrier, which is suppressed from causing the loss and wear of a magnetic carrier coating resin even when used for a long time period, and achieves a stable image density and a reduction in toner scattering. In the magnetic carrier, the resin coating layer contains a resin A having a fluorine polymer moiety, the resin coating layer has an average thickness of 50 nm or more, a ratio F(x) (atomic %) of a fluorine atom detected at a position at a depth of x nm from a surface of a magnetic carrier particle by X-ray photoelectron spectroscopy satisfies formula (1) and formula (2), and when x represents an integer of 0 or more and 20 or less, F(x) satisfies formula (3): 5.0?F(0)?15??(1) F(20)?5.0??(2) |F(x+1)?F(x)|?7.5??(3).Type: ApplicationFiled: January 21, 2022Publication date: July 28, 2022Inventors: Nobuhiro Yoshida, Hironori Minagawa, Yuzo Tokunaga, Nobuyoshi Sugahara, Yuu Nishimura
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Publication number: 20220050398Abstract: A toner includes toner particles containing a binder resin, a colorant, and inorganic fine particles, in which in a depth profile of an element distribution in a depth region from the outermost surface of a particle to a depth of 500 nm the depth profile being obtained by an element analysis performed by X-ray photoelectron spectroscopy using the toner as a sample, two or more minimum points of a concentration of a carbon element in the depth region exist, a concentration of an inorganic element becomes a maximum value at a depth position corresponding to each of the minimum points, and the inorganic element is an element derived from the inorganic fine particle.Type: ApplicationFiled: July 22, 2021Publication date: February 17, 2022Inventors: Kazunari Ooyama, Yuu Nishimura, Nobuyoshi Sugahara, Hitoshi Sano, Toru Takahashi, Kazuki Murata, Daisuke Tsujimoto, Koh Ishigami, Shin Kitamura, Takaho Shibata, Ryo Nakajima
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Publication number: 20210302854Abstract: A toner comprising a toner particle containing a binder resin containing at least 50 mass % of a polyester resin, wherein the polyester resin contains a polyester resin A having a silicone segment, and in XPS analysis, when X is a ratio of the number of silicon atoms attributable to silicone segments relative to a total number of measured atoms, X1 is a value of the X on the toner particle surface, X2 is a value of the X at a depth of 30 nm from the surface, Z is a ratio of the number of carbon atoms attributable to ester bonds relative to a total number of measured atoms, Z1 is a value of the Z on the toner particle surface and Z2 is a value of the Z at a depth of 30 nm from the toner particle surface, X1, Z1, X2 and Z2 satisfy a specific relationship.Type: ApplicationFiled: March 24, 2021Publication date: September 30, 2021Inventors: Shin Kitamura, Nobuyoshi Sugahara, Daisuke Tsujimoto, Kazunari Ooyama, Yuu Nishimura, Kazuki Murata, Toru Takahashi, Ryo Nakajima, Hitoshi Sano, Koh lshigami, Takaho Shibata
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Publication number: 20210302853Abstract: A toner comprising a toner particle containing a binder resin and a polymer A, wherein the binder resin contains a polyester resin having a specific structure, the polymer A has a first monomer unit derived from a specific (meth)acrylic acid ester and a second monomer unit different from the first monomer unit, a content ratio of the first monomer unit in the polymer A is 5.0 mol % to 60.0 mol % while a content ratio of the second monomer unit in the polymer A is 20.0 mol % to 95.0 mol %, and the SP value of the first monomer unit, the SP value of the second monomer unit, and the SP value of a silicone segment contained in the specific structure satisfy a specific relationship.Type: ApplicationFiled: March 24, 2021Publication date: September 30, 2021Inventors: Kazuki Murata, Koh Ishigami, Shin Kitamura, Nobuyoshi Sugahara, Takaho Shibata, Toru Takahashi, Kazunari Ooyama, Yuu Nishimura, Daisuke Tsujimoto, Ryo Nakajima, Hitoshi Sano
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Publication number: 20210223710Abstract: A toner including a toner particle comprising a binder resin and a crystalline polyester, wherein the binder resin contains a polyester having a structure represented by the following formula (1): in formula (1), Rs each independently represent hydrogen, a methyl group, or a phenyl group; A represents a polyester segment; B represents a polyester segment or any functional group selected from the group consisting of —R1OH, —R1COOH, and —R1NH2 wherein R1 represents a single bond or a C1-4 alkylene group; and the average repeat number n is 10 to 80.Type: ApplicationFiled: April 6, 2021Publication date: July 22, 2021Inventors: Toru Takahashi, Nobuyoshi Sugahara, Hitoshi Sano, Kazunari Ooyama, Yuu Nishimura, Kohji Takenaka, Koh Ishigami
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Patent number: 10877391Abstract: A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and in a molecular weight distribution of a THF soluble component of the resin component contained in the resin coating layer, a peak derived from the resin B is present in a molecular weight range of from 1000 to 9500.Type: GrantFiled: August 5, 2019Date of Patent: December 29, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Ryuichiro Matsuo, Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
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Patent number: 10859936Abstract: A magnetic carrier comprising a magnetic carrier core and a resin coating layer formed on the surface of the magnetic carrier core, wherein the resin coating layer includes a polymer having a structure represented by the following formula (1), and a content ratio of the structure represented by the formula (1) is from 5% by mass to 95% by mass based on a resin component of the resin coating layer, wherein, R1 is H or CH3, and X is a structure represented by the following formula (2): —(CmH2m)—R2—(CnH2n)—OH??(2) wherein, R2 is a hydrocarbon group being a cyclic structure having 4 to 8 carbon atoms, and m and n are integers of 0 to 4.Type: GrantFiled: September 16, 2019Date of Patent: December 8, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Nobuyoshi Sugahara, Ryuichiro Matsuo, Hironori Minagawa, Wakashi Iida
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Patent number: 10852653Abstract: A magnetic carrier includes a magnetic carrier particle including a magnetic carrier core particle having an amino group on a surface thereof and a resin covering layer disposed on the surface of the magnetic carrier core particle, in which the resin covering layer contains a vinyl-based copolymer and a trialkoxyalkylsilane.Type: GrantFiled: August 22, 2019Date of Patent: December 1, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Ryuichiro Matsuo, Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
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Patent number: 10838317Abstract: A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and based on the resin components of the resin coating layer, the amount of the resin A is from 20% by mass to 99% by mass, and the amount of the resin B is from 1% by mass to 80% by mass.Type: GrantFiled: July 30, 2019Date of Patent: November 17, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Nobuyoshi Sugahara, Ryuichiro Matsuo, Hironori Minagawa, Wakashi Iida
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Publication number: 20200103777Abstract: A magnetic carrier comprising a magnetic carrier core and a resin coating layer formed on the surface of the magnetic carrier core, wherein the resin coating layer includes a polymer having a structure represented by the following formula (1), and a content ratio of the structure represented by the formula (1) is from 5% by mass to 95% by mass based on a resin component of the resin coating layer, wherein, R1 is H or CH3, and X is a structure represented by the following formula (2): —(CmH2m)—R2—(CnH2n)—OH ??(2) wherein, R2 is a hydrocarbon group being a cyclic structure having 4 to 8 carbon atoms, and m and n are integers of 0 to 4.Type: ApplicationFiled: September 16, 2019Publication date: April 2, 2020Inventors: Nobuyoshi Sugahara, Ryuichiro Matsuo, Hironori Minagawa, Wakashi lida
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Publication number: 20200073270Abstract: A magnetic carrier includes a magnetic carrier particle including a magnetic carrier core particle having an amino group on a surface thereof and a resin covering layer disposed on the surface of the magnetic carrier core particle, in which the resin covering layer contains a vinyl-based copolymer and a trialkoxyalkylsilane.Type: ApplicationFiled: August 22, 2019Publication date: March 5, 2020Inventors: Ryuichiro Matsuo, Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
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Publication number: 20200050123Abstract: A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and based on the resin components of the resin coating layer, the amount of the resin A is from 20% by mass to 99% by mass, and the amount of the resin B is from 1% by mass to 80% by mass.Type: ApplicationFiled: July 30, 2019Publication date: February 13, 2020Inventors: Nobuyoshi Sugahara, Ryuichiro Matsuo, Hironori Minagawa, Wakashi Iida
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Publication number: 20200050124Abstract: A magnetic carrier including a magnetic carrier particle having a magnetic carrier core and a resin coating layer formed on a surface of the magnetic carrier core, wherein the resin coating layer includes a resin component including a resin A and a resin B, the resin A is a copolymer of monomers including (a) a (meth)acrylic acid ester monomer having an alicyclic hydrocarbon group and (b) a specific macromonomer, the resin B is a copolymer of monomers including (c) a styrene-based monomer and (d) a specific (meth)acrylic acid ester monomer, and in a molecular weight distribution of a THF soluble component of the resin component contained in the resin coating layer, a peak derived from the resin B is present in a molecular weight range of from 1000 to 9500.Type: ApplicationFiled: August 5, 2019Publication date: February 13, 2020Inventors: Ryuichiro Matsuo, Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
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Patent number: 10409188Abstract: Provided is a magnetic carrier comprising a magnetic carrier particle having a magnetic body-dispersed resin carrier core material and a resin coating layer; the core material includes magnetic particles A and B having number average primary particle diameter of ra and rb (?m), respectively, satisfying ra?rb; the particles A each include an oxide of at least one nonferrous metal of Mn, Al, Mg, Ti, and Ni; and an iron oxide; M1 represents total content of the nonferrous metal and F1 represents content of an iron of the magnetic carrier particle measured by XRF diffraction, M1/F1 is 0.010 to 0.100; M2 represents total content of the nonferrous metal and F2 represents content of an iron is F2 of the magnetic carrier particle measured by XPS, M2/F2 is 1.0 to 10.0.Type: GrantFiled: February 6, 2018Date of Patent: September 10, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
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Publication number: 20180231903Abstract: Provided is a magnetic carrier comprising a magnetic carrier particle having a magnetic body-dispersed resin carrier core material and a resin coating layer; the core material includes magnetic particles A and B having number average primary particle diameter of ra and rb (?m), respectively, satisfying ra?rb; the particles A each include an oxide of at least one nonferrous metal of Mn, Al, Mg, Ti, and Ni; and an iron oxide; M1 represents total content of the nonferrous metal and F1 represents content of an iron of the magnetic carrier particle measured by XRF diffraction, M1/F1 is 0.010 to 0.100; M2 represents total content of the nonferrous metal and F2 represents content of an iron is F2 of the magnetic carrier particle measured by XPS, M2/F2 is 1.0 to 10.0.Type: ApplicationFiled: February 6, 2018Publication date: August 16, 2018Inventors: Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida
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Patent number: 10007206Abstract: A magnetic carrier having a ferrite-type core material and a resin coat layer present on the surface of the ferrite-type core material, wherein the ferrite-type core material contains a magnetic ferrite-type core material particle and an amino group-bearing primer compound; the resin coat layer contains a coating resin A that is a polymer of monomer containing a (meth)acrylate ester having an alicyclic hydrocarbon group; the content of the amino group-bearing primer compound in the ferrite-type core material and the content of the resin coat layer in the magnetic carrier are within the prescribed range.Type: GrantFiled: February 7, 2017Date of Patent: June 26, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Nobuyoshi Sugahara, Hironori Minagawa, Wakashi Iida, Atsushi Nakano