Patents by Inventor Takashi Hirasa
Takashi Hirasa 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: 20190107793Abstract: A toner comprising: a toner particle that contains a resin component and a silicone compound, wherein the resin component contains at least 50 mass % of olefin resin; a content of the silicone compound is from 1 mass part to 42 mass parts per 100 mass parts of the resin component; a weight-average molecular weight of the silicone compound as measured by GPC is from 1,000 to 25,000; and a content, in a molecular weight distribution of the silicone compound as measured by GPC, of a component having a weight-average molecular weight of not more than 500 is not more than 0.05 mass % of the silicone compound.Type: ApplicationFiled: October 1, 2018Publication date: April 11, 2019Inventors: Junichi Tamura, Hayato Ida, Kentaro Kamae, Ryuji Murayama, Takashi Hirasa
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Patent number: 10234779Abstract: A toner includes a toner particle containing a resin component containing an olefin copolymer, wherein the olefin copolymer includes a specific monomer unit Y1 and a specific monomer unit Y2, and the content of the olefin copolymer in the resin component is more than 50 mass % based on the total mass of the resin component, and the olefin copolymer has a melting point of 80° C. or more and 150° C. or less.Type: GrantFiled: September 25, 2017Date of Patent: March 19, 2019Assignee: Canon Kabushiki KaishaInventors: Hayato Ida, Junichi Tamura, Ryuji Murayama, Takaho Shibata, Daisuke Yamashita, Takashi Hirasa
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Patent number: 10228629Abstract: A toner comprising a toner particle that contains a hybrid resin A and a crystalline polyester resin B, wherein the hybrid resin A has a polyester segment, and a polypropylene glycol segment that has a number-average molecular weight of at least 300, the polyester segment has a structure derived from a condensation reaction between a dicarboxylic acid and a diol, and has an aromatic ring in at least one of the dicarboxylic acid and the diol, and the following condition is satisfied: |SPh?SPc|?|SPp?SPc|<1 where, SPh is SP value of the polyester segment of the hybrid resin A, SPc is SP value of the crystalline polyester resin B, and SPp is SP value of the polypropylene glycol segment of the hybrid resin A.Type: GrantFiled: January 17, 2018Date of Patent: March 12, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Junichi Tamura, Hayato Ida, Takaho Shibata, Yuya Chimoto, Kouichirou Ochi, Ryuji Murayama, Daisuke Yamashita, Tomoyo Miyakai, Takashi Hirasa
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Patent number: 10216106Abstract: A method for producing a toner includes a step (1) of forming resin microparticles in an aqueous medium in the presence of a surfactant, a step (2) of aggregating the resin microparticles to form aggregated particles, and a step (3) of heating and the aggregated particles and allowing the aggregated particles to coalesce to form toner particles, in which a resin component in the resin microparticles contains an olefinic copolymer and resin A, the resin A has an acid value of 1 mgKOH/g or more and 50 mgKOH/g or less, the resin A has a SP value of 19.0 (J/cm3)0.5 or more and 21.0 (J/cm3)0.5 or less, and the resin component has an olefinic copolymer content of 50% by mass or more with respect to the total mass of the resin component.Type: GrantFiled: May 23, 2016Date of Patent: February 26, 2019Assignee: Canon Kabushiki KaishaInventors: Tomoyo Miyakai, Junichi Tamura, Hayato Ida, Takaho Shibata, Kouichirou Ochi, Yuya Chimoto, Ryuji Murayama, Daisuke Yamashita, Akemi Watanabe, Takashi Hirasa
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Publication number: 20190049869Abstract: A toner including a toner particle having a core-shell structure that has a core formed from a resin 1 and a shell formed from a resin 2 on the surface of the core, wherein the resin 1 contains more than 50 mass % of an ester group-containing olefin-based copolymer, the ester group-containing olefin-based copolymer has a monomer unit Y1 represented by formula (1) below, and at least one type of monomer unit Y2 selected from the group consisting of monomer units represented by formula (2) and formula (3) below, the ester group concentration in the ester group-containing olefin-based copolymer is from 2 mass % to 18 mass %, and the resin 2 is an amorphous resin having a Tg value of from 50° C. to 70° C.Type: ApplicationFiled: August 7, 2018Publication date: February 14, 2019Inventors: Kentaro Kamae, Ryuji Murayama, Junichi Tamura, Hayato Ida, Takashi Hirasa
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Patent number: 10203619Abstract: A toner including: a binder resin containing an ethylene-vinyl acetate copolymer; a polysiloxane derivative A represented by structural formula 1; and a polysiloxane derivative B represented by structural formula 2: (in structural formula 1, R1 to R10 each independently represent a methyl group or a phenyl group, and l, m and n each independently represent an integer of at least 1) (in structural formula 2, at least one of R11 to R20 is an organic group having a C4-30 alkyl group, a C4-30 alkoxy group, an acrylic group, an amino group, a methacrylic group or a carboxyl group, the remaining groups among R11 to R20 each independently represent a methyl group or a phenyl group, and p, q and r each independently represent an integer of at least 1).Type: GrantFiled: August 28, 2017Date of Patent: February 12, 2019Assignee: CANON KABUSHIKI KAISHAInventors: Daisuke Yamashita, Takashi Hirasa, Hayato Ida, Junichi Tamura, Takaho Shibata, Ryuji Murayama, Kouichirou Ochi, Yuya Chimoto, Tomoyo Miyakai
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Publication number: 20180348658Abstract: A curable liquid developer containing: a toner particle containing a pigment and a binder resin; a toner particle dispersing agent; and a cationically polymerizable liquid monomer, wherein the binder resin contains a polyester resin having an acid value of at least 5 mg KOH/g; the polyester resin contains an alcohol component-derived monomer unit and an acid component-derived monomer unit; the alcohol component-derived monomer unit and the acid component-derived monomer unit contain specific monomer units in specific proportions; and the content of the polyester resin in the binder resin is at least 50 mass % and not more than 100 mass %.Type: ApplicationFiled: May 24, 2018Publication date: December 6, 2018Inventors: Naohiko Tsuchida, Takashi Hirasa, Yasutaka Akashi, Yuzo Tokunaga, Akifumi Matsubara, Ryo Natori, Waka Hasegawa, Ayano Mashida, Junji Ito, Yasuhiro Aichi, Jun Shirakawa
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Patent number: 10088765Abstract: A toner comprising a toner particle including a resin component, wherein the resin component includes an olefin resin and an olefin copolymer including a hydroxyl group, the olefin resin has a specific monomer unit Y1, the olefin copolymer including a hydroxyl group has a specific monomer unit Z1 and Z2, a hydroxyl value of the olefin resin is not more than 10 mg KOH/g, a hydroxyl value of the olefin copolymer including a hydroxyl group is at least 20 mg KOH/g and not more than 250 mg KOH/g, and a content of the olefin resin in the resin component is more than 50 mass % with respect to a total mass of the resin component.Type: GrantFiled: October 11, 2017Date of Patent: October 2, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Tomoyo Miyakai, Hayato Ida, Takaho Shibata, Junichi Tamura, Ryuji Murayama, Daisuke Yamashita, Takashi Hirasa
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Patent number: 10078281Abstract: A toner having a toner particle containing a resin component, wherein the resin component contains an olefin copolymer having ester group and the like, which has a unit (1), and a unit Y2 that is at least one selected from (2) and (3), the content of the copolymer in the resin component is at least 50 mass % with respect to the total mass of the resin component, and the content of the monomer unit Y2 is 3 to 35 mass % with respect to the total mass of the copolymer; in formulas (1) to (3), R1, R2 and R4 each independently represent H or CH3, and R3 and R5 each independently represent CH3 or C2H5.Type: GrantFiled: September 1, 2017Date of Patent: September 18, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Hayato Ida, Junichi Tamura, Ryuji Murayama, Takaho Shibata, Daisuke Yamashita, Takashi Hirasa
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Publication number: 20180203370Abstract: A toner comprising a toner particle that contains a hybrid resin A and a crystalline polyester resin B, wherein the hybrid resin A has a polyester segment, and a polypropylene glycol segment that has a number-average molecular weight of at least 300, the polyester segment has a structure derived from a condensation reaction between a dicarboxylic acid and a diol, and has an aromatic ring in at least one of the dicarboxylic acid and the diol, and the following condition is satisfied: |SPh?SPc|?|SPp?SPc|<1 where, SPh is SP value of the polyester segment of the hybrid resin A, SPc is SP value of the crystalline polyester resin B, and SPp is SP value of the polypropylene glycol segment of the hybrid resin A.Type: ApplicationFiled: January 17, 2018Publication date: July 19, 2018Inventors: Junichi Tamura, Hayato Ida, Takaho Shibata, Yuya Chimoto, Kouichirou Ochi, Ryuji Murayama, Daisuke Yamashita, Tomoyo Miyakai, Takashi Hirasa
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Publication number: 20180143547Abstract: A method for producing a toner includes a step (1) of forming resin microparticles in an aqueous medium in the presence of a surfactant, a step (2) of aggregating the resin microparticles to form aggregated particles, and a step (3) of heating and the aggregated particles and allowing the aggregated particles to coalesce to form toner particles, in which a resin component in the resin microparticles contains an olefinic copolymer and resin A, the resin A has an acid value of 1 mgKOH/g or more and 50 mgKOH/g or less, the resin A has a SP value of 19.0 (J/cm3)0.5 or more and 21.0 (J/cm3)0.5 or less, and the resin component has an olefinic copolymer content of 50% by mass or more with respect to the total mass of the resin component.Type: ApplicationFiled: May 23, 2016Publication date: May 24, 2018Inventors: Tomoyo Miyakai, Junichi Tamura, Hayato Ida, Takaho Shibata, Kouichirou Ochi, Yuya Chimoto, Ryuji Murayama, Daisuke Yamashita, Akemi Watanabe, Takashi Hirasa
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Patent number: 9958800Abstract: A toner includes a toner particle containing a resin component. The resin component contains an ester group-containing olefin copolymer and an acid group-containing olefin copolymer. For example, the ester group-containing olefin copolymer is an ethylene-vinyl acetate copolymer, and the acid group-containing olefin copolymer is an ethylene-methacrylic acid copolymer. The acid group-containing olefin copolymer has an acid value of 50 to 300 mg KOH/g. The content of the ester group-containing olefin copolymer in the resin component is 50 mass % or more based on the total mass of the resin component. The content of the unit derived from the vinyl acetate is 3 mass % or more and 35 mass % or less based on the total mass of the ester group-containing olefin copolymer.Type: GrantFiled: April 25, 2017Date of Patent: May 1, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Yuya Chimoto, Hayato Ida, Takaho Shibata, Junichi Tamura, Kouichirou Ochi, Ryuji Murayama, Daisuke Yamashita, Tomoyo Miyakai, Takashi Hirasa, Kentaro Kamae
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Publication number: 20180107128Abstract: A toner comprising a toner particle including a resin component, wherein the resin component includes an olefin resin and an olefin copolymer including a hydroxyl group, the olefin resin has a specific monomer unit Y1, the olefin copolymer including a hydroxyl group has a specific monomer unit Z1 and Z2, a hydroxyl value of the olefin resin is not more than 10 mg KOH/g, a hydroxyl value of the olefin copolymer including a hydroxyl group is at least 20 mg KOH/g and not more than 250 mg KOH/g, and a content of the olefin resin in the resin component is more than 50 mass % with respect to a total mass of the resin component.Type: ApplicationFiled: October 11, 2017Publication date: April 19, 2018Inventors: Tomoyo Miyakai, Hayato Ida, Takaho Shibata, Junich Tamura, Ryuji Murayama, Daisuke Yamashita, Takashi Hirasa
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Publication number: 20180088478Abstract: A toner includes a toner particle containing a resin component containing an olefin copolymer, wherein the olefin copolymer includes a specific monomer unit Y1 and a specific monomer unit Y2, and the content of the olefin copolymer in the resin component is more than 50 mass % based on the total mass of the resin component, and the olefin copolymer has a melting point of 80° C. or more and 150° C. or less.Type: ApplicationFiled: September 25, 2017Publication date: March 29, 2018Inventors: Hayato Ida, Junichi Tamura, Ryuji Murayama, Takaho Shibata, Daisuke Yamashita, Takashi Hirasa
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Publication number: 20180067411Abstract: A toner having a toner particle containing a resin component, wherein the resin component contains an olefin copolymer having ester group and the like, which has a unit (1), and a unit Y2 that is at least one selected from (2) and (3), the content of the copolymer in the resin component is at least 50 mass % with respect to the total mass of the resin component, and the content of the monomer unit Y2 is 3 to 35 mass % with respect to the total mass of the copolymer; in formulas (1) to (3), R1, R2 and R4 each independently represent H or CH3, and R3 and R5 each independently represent CH3 or C2H5.Type: ApplicationFiled: September 1, 2017Publication date: March 8, 2018Inventors: Hayato Ida, Junichi Tamura, Ryuji Murayama, Takaho Shibata, Daisuke Yamashita, Takashi Hirasa
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Publication number: 20180067410Abstract: A toner including: a binder resin containing an ethylene-vinyl acetate copolymer; a polysiloxane derivative A represented by structural formula 1; and a polysiloxane derivative B represented by structural formula 2: (in structural formula 1, R1 to R10 each independently represent a methyl group or a phenyl group, and l, m and n each independently represent an integer of at least 1) (in structural formula 2, at least one of R11 to R20 is an organic group having a C4-30 alkyl group, a C4-30 alkoxy group, an acrylic group, an amino group, a methacrylic group or a carboxyl group, the remaining groups among R11 to R20 each independently represent a methyl group or a phenyl group, and p, q and r each independently represent an integer of at least 1).Type: ApplicationFiled: August 28, 2017Publication date: March 8, 2018Inventors: Daisuke Yamashita, Takashi Hirasa, Hayato Ida, Junichi Tamura, Takaho Shibata, Ryuji Murayama, Kouichirou Ochi, Yuya Chimoto, Tomoyo Miyakai
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Publication number: 20170315462Abstract: A toner includes a toner particle containing a resin component. The resin component contains an ester group-containing olefin copolymer and an acid group-containing olefin copolymer. For example, the ester group-containing olefin copolymer is an ethylene-vinyl acetate copolymer, and the acid group-containing olefin copolymer is an ethylene-methacrylic acid copolymer. The acid group-containing olefin copolymer has an acid value of 50 to 300 mg KOH/g. The content of the ester group-containing olefin copolymer in the resin component is 50 mass % or more based on the total mass of the resin component. The content of the unit derived from the vinyl acetate is 3 mass % or more and 35 mass % or less based on the total mass of the ester group-containing olefin copolymer.Type: ApplicationFiled: April 25, 2017Publication date: November 2, 2017Inventors: Yuya Chimoto, Hayato Ida, Takaho Shibata, Junichi Tamura, Kouichirou Ochi, Ryuji Murayama, Daisuke Yamashita, Tomoyo Miyakai, Takashi Hirasa, Kentaro Kamae
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Patent number: 9696644Abstract: The present invention provides a crystalline polyester resin having a sharp melt property that realizes both fixing performance and blocking property and demonstrates favorable charging performance, in which the crystalline polyester resin for toner, satisfying the following relationships, 25?Tg?70, and (Tg+273)/(Mp+273)?0.75, wherein Tg (° C.) represents a glass transition temperature of the crystalline polyester resin for toner, and Mp (° C.) represents a melting point of the crystalline polyester resin for toner.Type: GrantFiled: April 8, 2014Date of Patent: July 4, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Hayato Ida, Takashi Hirasa, Junichi Tamura, Yuya Chimoto, Takaho Shibata, Daisuke Yamashita
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Patent number: 9658550Abstract: Toner containing toner particles having a resin component, in which the resin component has an olefin-based copolymer and a crystalline polyester resin, the olefin-based copolymer has a unit Y1 represented by Formula (1) and at least one kind of unit Y2 selected from the group consisting of a unit represented by Formula (2) and a unit represented by Formula (3), a content of the olefin-based copolymer contained in the resin component is 50% by mass or more based on a total mass of the resin component, a content of the unit Y2 is 3% by mass or more and 35% by mass or less based on a total mass of the olefin-based copolymer, and a melt flow rate of the olefin-based copolymer is 30 g/10 min or less.Type: GrantFiled: May 26, 2016Date of Patent: May 23, 2017Assignee: Canon Kabushiki KaishaInventors: Ryuji Murayama, Hayato Ida, Takaho Shibata, Junichi Tamura, Daisuke Yamashita, Akemi Watanabe, Kouichirou Ochi, Yuya Chimoto, Tomoyo Miyakai, Takashi Hirasa
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Patent number: 9540483Abstract: The present invention provides a crystalline polyester resin which has sharp melt property, can achieve both fixing performance and blocking property and has excellent development durability, in which the crystalline polyester resin for toner which has a Young's modulus as measured by an ultramicro durometer at 25° C. of at least 2 GPa and a melting point of at least 60° C. and not more than 125° C.Type: GrantFiled: April 8, 2014Date of Patent: January 10, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Hayato Ida, Takashi Hirasa, Junichi Tamura, Yuya Chimoto, Takaho Shibata, Daisuke Yamashita