Patents by Inventor Daisuke Tsujimoto
Daisuke Tsujimoto 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: 20240069457Abstract: The toner contains binder resin-containing toner particles and silica fine particle S1, wherein the weight-average particle diameter of the toner is 4.0-15.0 ?m, both inclusive, peaks originating with the silica fine particle S1 are observed in 29 Si-NMR measurement of the silica fine particle S1, and, in the spectrum obtained by 29Si CP/MAS NMR or 29Si DD/MAS NMR, the peak area of a peak corresponding to the D1 unit structure in the silica fine particle S1, the peak area of a peak corresponding to the D2 unit structure in the silica fine particle S1, and the peak area of a peak corresponding to the Q unit structure in the silica fine particle S1 satisfy a prescribed relationship.Type: ApplicationFiled: October 25, 2023Publication date: February 29, 2024Inventors: RYUJI MURAYAMA, SHIN KITAMURA, TORU TAKAHASHI, DAISUKE TSUJIMOTO, RYUICHIRO MATSUO, HITOSHI SANO, NOBUYUKI FUJITA, SHUJI YAMADA, YUKA GUNJI, TAKAKUNI KOBORI, YOSHIHIRO OGAWA, ATSUHIKO OHMORI, HIROKI KAGAWA, KEISUKE ADACHI, TOMOKO SUGITA
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Publication number: 20230408940Abstract: A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 ?m; the silica fine particle A comprises a silicone oil and a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%; and an area of each peak obtained in a solid-state CP/MAS 29Si-NMR measurement of the silica fine particle A and of the silica fine particle A after washing thereof with hexane is in a specific range.Type: ApplicationFiled: April 27, 2023Publication date: December 21, 2023Inventors: RYUICHIRO MATSUO, TORU TAKAHASHI, DAISUKE TSUJIMOTO, SHIN KITAMURA, RYUJI MURAYAMA, HITOSHI SANO, NOBUYUKI FUJITA, SHUJI YAMADA, YUKA GUNJI, TAKAKUNI KOBORI, YOSHIHIRO OGAWA
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Publication number: 20230408944Abstract: A toner which has a toner particle and silica fine particle A on a surface of the toner particle, wherein a weight average particle diameter of the toner is 4.0 to 15.0 ?m, a carbon loss ratio when the silica fine particle A is washed with hexane is 5 to 70%, and a temperature at which a differential coefficient of a nine-point moving average of integrated values integrated from 35° C. reaches 4000 or more for an intensity of an obtained ion having a mass number (M/z) of 207 is 270° C. or higher, when mass spectrometry is carried out at a sampling interval of 0.4 seconds while heating the silica fine particle A under specific conditions.Type: ApplicationFiled: April 27, 2023Publication date: December 21, 2023Inventors: DAISUKE TSUJIMOTO, TORU TAKAHASHI, RYUICHIRO MATSUO, SHIN KITAMURA, NOBUYUKI FUJITA, RYUJI MURAYAMA, HITOSHI SANO, TAKAKUNI KOBORI, YOSHIHIRO OGAWA
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Publication number: 20230408943Abstract: A toner comprising a toner particle and a silica fine particle A on a surface of the toner particle, wherein: a weight-average particle diameter of the toner is 4.0 to 15.0 ?m; the silica fine particle A is a treated silica fine particle having been surface-treated; and areas of each peak which is obtained by a solid-state DD/MAS 29Si-NMR measurement of the silica fine particle A and the silica fine particle A after washing thereof with hexane is in a specific range, and a full width at half maximum of the peak which is obtained by a solid-state DD/MAS 29Si-NMR measurement of the silica fine particle A is in a specific range.Type: ApplicationFiled: April 27, 2023Publication date: December 21, 2023Inventors: SHIN KITAMURA, TORU TAKAHASHI, DAISUKE TSUJIMOTO, RYUICHIRO MATSUO, RYUJI MURAYAMA, HITOSHI SANO, NOBUYUKI FUJITA, SHUJI YAMADA, YUKA GUNJI, TAKAKUNI KOBORI, YOSHIHIRO OGAWA
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Publication number: 20220252995Abstract: A magnetic toner comprising a toner particle comprising a binder resin and magnetic iron oxide particles, wherein a content of the magnetic iron oxide particles in the magnetic toner is 30 to 45 mass %, the magnetic iron oxide particles contain (i) spherical magnetic iron oxide particles and (ii) at least one selected from the group consisting of hexahedral magnetic iron oxide particles and octahedral magnetic iron oxide particles, and a content of the spherical magnetic iron oxide particles in the magnetic iron oxide particles is 1.0 to 9.0% by number.Type: ApplicationFiled: January 21, 2022Publication date: August 11, 2022Inventors: Daisuke Tsujimoto, Koh Ishigami, Junichi Tamura, Hiroki Watanabe
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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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Patent number: 11249410Abstract: A toner having an adequate storage stability and adequately suppressing an ejected paper adhesion, while achieving improving low-temperature fixability, has a toner particle containing a binder resin and a plasticizer, wherein Tg1 is 53° C. or lower and Tg2 is 55° C. or higher, in DSC measurement using the toner as a sample, when the following steps (i) to (iii) are performed: (i): the temperature of the toner is raised for the first time at a rate of temperature increase of 10° C./min, (ii): after the step (i), the temperature of the toner is lowered at a rate of temperature decrease of 10° C./min, (iii): after the step (ii), the temperature of the toner is raised for the second time at a rate of temperature increase of 10° C./min, Tg1 represents a glass transition temperature measured at the step (i), and Tg2 represents a glass transition temperature measured at the step (iii).Type: GrantFiled: December 9, 2019Date of Patent: February 15, 2022Assignee: CANON KABUSHIKI KAISHAInventors: Toru Takahashi, Daisuke Tsujimoto, Hiroki Watanabe, Yoshihiro Ogawa, Wakashi Iida
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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: 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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Patent number: 10859935Abstract: A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00<x?0.80, and (ii) the difference between x and xp “xp?x” satisfying 0.00<xp?x?0.95, where xp is the maximum peak value (atomic %) of the Sr element abundance in the region from the outermost surface to 50 nm.Type: GrantFiled: August 26, 2019Date of Patent: December 8, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Takeshi Ohtsu, Tadashi Fukuda, Mikihiro Akasaki, Akinori Miyamoto, Kota Mori, Masami Hano, Takashi Kase, Daisuke Tsujimoto, Ryuichiro Matsuo, Kazuto Hosoi, Yoshihiro Ogawa
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Patent number: 10768543Abstract: A toner having a toner particle, which contains a binder resin, and inorganic fine particles, the toner being characterized in that the binder resin contains a polyester resin, the polyester resin has, at a terminal, an alkyl group having an average number of carbon atoms of from 4 to 102, the number average particle diameter of primary particles of the inorganic fine particles is from 10 to 90 nm, the dielectric constant of the inorganic fine particles is from 55.0 to 100.0 pF/m, as measured at 25° C. and 1 MHz, and the inorganic fine particles are surface-treated with an alkylalkoxysilane represented by formula (1) below: CnH2n+1—SiOCmH2m+1)3??(1) in formula (1), n denotes an integer of from 4 to 20, and m denotes an integer of from 1 to 3.Type: GrantFiled: August 26, 2019Date of Patent: September 8, 2020Assignee: Canon Kabushiki KaishaInventors: Daisuke Tsujimoto, Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Wakashi Iida
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Patent number: 10747132Abstract: A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2?) of 32.00 deg to 32.40 deg in CuK? characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2?) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.Type: GrantFiled: September 5, 2019Date of Patent: August 18, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
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Publication number: 20200192233Abstract: A toner having an adequate storage stability and adequately suppressing an ejected paper adhesion, while achieving improving low-temperature fixability, has a toner particle containing a binder resin and a plasticizer, wherein Tg1 is 53° C. or lower and Tg2 is 55° C. or higher, in DSC measurement using the toner as a sample, when the following steps (i) to (iii) are performed: (i): the temperature of the toner is raised for the first time at a rate of temperature increase of 10° C./min, (ii): after the step (i), the temperature of the toner is lowered at a rate of temperature decrease of 10° C./min, (iii): after the step (ii), the temperature of the toner is raised for the second time at a rate of temperature increase of 10° C./min, Tg1 represents a glass transition temperature measured at the step (i), and Tg2 represents a glass transition temperature measured at the step (iii).Type: ApplicationFiled: December 9, 2019Publication date: June 18, 2020Inventors: Toru Takahashi, Daisuke Tsujimoto, Hiroki Watanabe, Yoshihiro Ogawa, Wakashi Iida
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Publication number: 20200073265Abstract: A toner having a toner particle, which contains a binder resin, and inorganic fine particles, the toner being characterized in that the binder resin contains a polyester resin, the polyester resin has, at a terminal, an alkyl group having an average number of carbon atoms of from 4 to 102, the number average particle diameter of primary particles of the inorganic fine particles is from 10 to 90 nm, the dielectric constant of the inorganic fine particles is from 55.0 to 100.0 pF/m, as measured at 25° C. and 1 MHz, and the inorganic fine particles are surface-treated with an alkylalkoxysilane represented by formula (1) below: CnH2n+1—Si?OCmH2m+1)3??(1) in formula (1), n denotes an integer of from 4 to 20, and m denotes an integer of from 1 to 3.Type: ApplicationFiled: August 26, 2019Publication date: March 5, 2020Inventors: Daisuke Tsujimoto, Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Wakashi Iida
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Publication number: 20200073266Abstract: A toner includes toner particle containing at least a strontium titanate particle on the surface of the toner particle, and the toner is a water-washed toner from which strontium titanate particle desorbable by water washing are removed by water washing. The water-washed toner contains the strontium titanate particle having a number average particle diameter of primary particle (D1) of 10 nm or more and 150 nm or less, and when the distribution of an Sr element in the water-washed toner in the depth direction is determined, (i) the Sr element abundance on the outermost surface x satisfying 0.00<x?0.80, and (ii) the difference between x and xp “xp?x” satisfying 0.00<xp?x?0.95, where xp is the maximum peak value (atomic %) of the Sr element abundance in the region from the outermost surface to 50 nm.Type: ApplicationFiled: August 26, 2019Publication date: March 5, 2020Inventors: Takeshi Ohtsu, Tadashi Fukuda, Mikihiro Akasaki, Akinori Miyamoto, Kota Mori, Masami Hano, Takashi Kase, Daisuke Tsujimoto, Ryuichiro Matsuo, Kazuto Hosoi, Yoshihiro Ogawa
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Patent number: 10551759Abstract: A toner having: a toner particle including a binder resin; and an inorganic fine particle, wherein the inorganic fine particle includes a calcium strontium zirconate fine particle.Type: GrantFiled: November 13, 2018Date of Patent: February 4, 2020Assignee: CANON KABUSHIKI KAISHAInventors: Hiroki Watanabe, Toru Takahashi, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
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Publication number: 20190391505Abstract: A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2?) of 32.00 deg to 32.40 deg in CuK? characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2?) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.Type: ApplicationFiled: September 5, 2019Publication date: December 26, 2019Inventors: Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
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Patent number: 10451985Abstract: A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2?) of 32.00 deg to 32.40 deg in CuK? characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2?) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass, and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.Type: GrantFiled: February 22, 2018Date of Patent: October 22, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
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Publication number: 20190155182Abstract: A toner having: a toner particle including a binder resin; and an inorganic fine particle, wherein the inorganic fine particle includes a calcium strontium zirconate fine particle.Type: ApplicationFiled: November 13, 2018Publication date: May 23, 2019Inventors: Hiroki Watanabe, Toru Takahashi, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida
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Publication number: 20180246429Abstract: A toner comprising a toner particle, and strontium titanate, wherein the strontium titanate has a specific number average particle diameter, the strontium titanate has a maximum peak (a) at a diffraction angle (2?) of 32.00 deg to 32.40 deg in CuK? characteristic X-ray diffraction, the half width of the maximum peak (a) is 0.23 deg to 0.50 deg, an intensity (Ia) of the maximum peak (a) and a maximum peak intensity (Ix) in a range of a diffraction angle (2?) of 24.00 deg to 28.00 deg satisfy a specific relationship, the content of strontium oxide and titanium oxide in the strontium titanate is at least 98.0% by mass,and a sum total Et of a rotational torque and a vertical load in powder flowability analysis of the toner is 100 mJ to 2000 mJ.Type: ApplicationFiled: February 22, 2018Publication date: August 30, 2018Inventors: Toru Takahashi, Hiroki Watanabe, Yoshihiro Ogawa, Daisuke Tsujimoto, Wakashi Iida