Patents by Inventor Sakyo Yagyu
Sakyo Yagyu 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: 20230383020Abstract: A method for producing hollow particles which comprise a shell and a hollow portion surrounded by the shell and which have a void ratio of 50% or more, the method comprising: preparing a mixture liquid containing a polymerizable monomer, a hydrophobic solvent, a polymerization initiator, a dispersion stabilizer and an aqueous medium, suspending the mixture liquid to prepare a suspension in which droplets or a monomer composition containing the polymerizable monomer, the hydrophobic solvent and the polymerization initiator are dispersed in the aqueous medium, and subjecting the suspension to a polymerization reaction to prepare a precursor composition containing precursor particles which have a hollow portion surrounded by a shell containing a resin and which include the hydrophobic solvent in the hollow portion, wherein the polymerizable monomer contains a crosslinkable monomer, and wherein an HOP distance between the crosslinkable monomer and the hydrophobic solvent is 5.80 to 6.50.Type: ApplicationFiled: October 29, 2021Publication date: November 30, 2023Applicant: ZEON CORPORATIONInventor: Sakyo Yagyu
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Publication number: 20230383021Abstract: A method for producing hollow particles which have a void ratio of 50% or more, the method comprising: preparing a mixture liquid containing a polymerizable monomer, a hydrophobic solvent, an aqueous medium, etc., suspending the mixture liquid to prepare a suspension in which droplets of a monomer composition containing the polymerizable monomer, the hydrophobic solvent, etc., are dispersed in the aqueous medium, and subjecting the suspension to a polymerization reaction to prepare a precursor composition containing precursor particles having a hollow portion surrounded by a shell and filled with the hydrophobic solvent, wherein the polymerizable monomer a hydrocarbon monomer, and in 100% by mass of the polymerizable monomer, a content of a crosslinkable monomer containing two or more ethylenically unsaturated double bonds is 70% by mass or more, and wherein the hydrophobic solvent is a hydrocarbon solvent containing 5 to 8 carbon atoms.Type: ApplicationFiled: October 26, 2021Publication date: November 30, 2023Applicant: ZEON CORPORATIONInventor: Sakyo Yagyu
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Patent number: 11789375Abstract: The present invention provides a toner for electrostatic-image development comprising a color resin particle containing a binder resin, a colorant, a charge control agent, and a release agent, and an additive having a polydiene structure, wherein the additive having the polydiene structure has a solubility in styrene at a temperature of 40° C. of 3 to 40 g/100 g, when a cross section of the color resin particle is observed by a transmission electron microscope (TEM), the number of crystal domains of the release agent having an aspect ratio in a range of 2 to 10 in a field of view of 2 ?m×2 ?m square of the cross section of the color resin particle is 2 to 30.Type: GrantFiled: August 30, 2019Date of Patent: October 17, 2023Assignee: ZEON CORPORATIONInventor: Sakyo Yagyu
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Patent number: 11747745Abstract: The toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive. The colored resin particles further comprise a styrene-based thermoplastic elastomer. The styrene-based thermoplastic elastomer comprises an isoprene unit. A content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.Type: GrantFiled: December 15, 2021Date of Patent: September 5, 2023Assignee: ZEON CORPORATIONInventor: Sakyo Yagyu
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Publication number: 20230185211Abstract: Provided is a toner for development of electrostatic images comprising colored resin particles containing a binder resin, a colorant, a charge control agent, and a release agent, wherein the colored resin particles have a storage modulus G? (60) at 60° C. of 1.0×108 to 5.0×108 Pa, a storage modulus G? (100) at 100° C. of 8.0×104 to 2.3×105 Pa, and a storage modulus G? (150) at 150° C. of 1.4×104 to 3.0×104 Pa, these storage moduli being determined by dynamic viscoelastic analysis.Type: ApplicationFiled: June 25, 2021Publication date: June 15, 2023Applicant: ZEON CORPORATIONInventors: Sakyo Yagyu, Takeshi Hirata
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Patent number: 11474443Abstract: The toner for developing electrostatic images is less likely to cause toner ejection and is excellent in printing durability. The toner includes colored resin particles and external additives. The external additives includes an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.Type: GrantFiled: September 3, 2020Date of Patent: October 18, 2022Assignee: ZEON CORPORATIONInventors: Takeru Chiba, Sakyo Yagyu
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Publication number: 20220107575Abstract: The toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive. The colored resin particles further comprise a styrene-based thermoplastic elastomer. The styrene-based thermoplastic elastomer comprises an isoprene unit. A content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.Type: ApplicationFiled: December 15, 2021Publication date: April 7, 2022Applicant: ZEON CORPORATIONInventor: Sakyo Yagyu
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Patent number: 11237496Abstract: Provided is a toner which provides excellent balance between high temperature storage stability and low temperature fixability and which is less likely to cause the bleeding out of a release agent even in a long-term, high-temperature condition. Disclosed is a toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive, wherein the colored resin particles further comprise a styrene-based thermoplastic elastomer, and wherein a content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.Type: GrantFiled: September 27, 2018Date of Patent: February 1, 2022Assignee: ZEON CORPORATIONInventor: Sakyo Yagyu
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Publication number: 20210318633Abstract: The present invention provides a toner for electrostatic-image development comprising a color resin particle containing a binder resin, a colorant, a charge control agent, and a release agent, and an additive having a polydiene structure, wherein the additive having the polydiene structure has a solubility in styrene at a temperature of 40° C. of 3 to 40 g/100 g, when a cross section of the color resin particle is observed by a transmission electron microscope (TEM), the number of crystal domains of the release agent having an aspect ratio in a range of 2 to 10 in a field of view of 2 ?m×2 ?m square of the cross section of the color resin particle is 2 to 30.Type: ApplicationFiled: August 30, 2019Publication date: October 14, 2021Applicant: ZEON CORPORATIONInventor: Sakyo Yagyu
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Patent number: 10901336Abstract: Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.Type: GrantFiled: February 28, 2018Date of Patent: January 26, 2021Assignee: ZEON CORPORATIONInventors: Sakyo Yagyu, Takeru Chiba
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Publication number: 20200401060Abstract: The toner for developing electrostatic images is less likely to cause toner ejection and is excellent in printing durability. The toner includes colored resin particles and external additives. The external additives includes an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.Type: ApplicationFiled: September 3, 2020Publication date: December 24, 2020Applicant: ZEON CORPORATIONInventors: Takeru Chiba, Sakyo Yagyu
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Patent number: 10788767Abstract: Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.Type: GrantFiled: June 26, 2017Date of Patent: September 29, 2020Assignee: ZEON CORPORATIONInventors: Takeru Chiba, Sakyo Yagyu
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Publication number: 20200233326Abstract: Provided is a toner which provides excellent balance between high temperature storage stability and low temperature fixability and which is less likely to cause the bleeding out of a release agent even in a long-term, high-temperature condition. Disclosed is a toner for developing electrostatic images, comprising: colored resin particles comprising a binder resin, a colorant and a release agent, and an external additive, wherein the colored resin particles further comprise a styrene-based thermoplastic elastomer, and wherein a content of a fatty acid ester compound having a number average molecular weight (Mn) of 500 or more and less than 2,000 as the release agent, is from 2 parts by mass to 20 parts by mass with respect to 100 parts by mass of the binder resin.Type: ApplicationFiled: September 27, 2018Publication date: July 23, 2020Applicant: ZEON CORPORATIONInventor: Sakyo Yagyu
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Publication number: 20200233329Abstract: Provided is a positively-chargeable toner for developing electrostatic images excellent in printing durability, charge stability, and conveyance amount stability. The toner comprises colored resin particles comprising a binder resin and a colorant, and an external additive, wherein the external additive comprises spherical silica particles with a number average particle diameter of 70 to 200 nm. wherein the external additive has a particle size distribution in which a percentage of a number of particles having a particle diameter of 50 nm or more is 75% or more, which is calculated based on a SEM image.Type: ApplicationFiled: February 28, 2018Publication date: July 23, 2020Applicant: ZEON CORPORATIONInventors: Sakyo Yagyu, Takeru Chiba
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Publication number: 20190212667Abstract: Provided is a toner for developing electrostatic images which is less likely to cause toner ejection and is excellent in printing durability. The toner comprises colored resin particles and external additives, wherein the external additives comprise an external additive A and an external additive B; wherein the external additive A is silica particles being surface-hydrophobized with a specific hydrophobizing agent and having a specific number average particle diameter; and wherein the external additive B is silicone resin particles having a ratio (BS/TS) of a BET specific surface area (BS) to a theoretical specific surface area (TS) in a range of from 3.0 to 30.0, and having a specific number average particle diameter.Type: ApplicationFiled: June 26, 2017Publication date: July 11, 2019Applicant: ZEON CORPORATIONInventors: Takeru Chiba, Sakyo Yagyu