Patents by Inventor Yusuke Takigaura
Yusuke Takigaura 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: 20240361710Abstract: An image forming system includes, an electrostatic charge image developing toner; and a developing sleeve configured to convey the electrostatic charge image developing toner, wherein a toner particle included in the electrostatic charge image developing toner contains an amorphous polyester, the amorphous polyester is a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol, a content percentage of a structural unit derived from a bisphenol A derivative in the amorphous polyester is 10 mol % or less with respect to all structural units derived from the polyhydric alcohol, and the developing sleeve includes an aluminum alloy including more than 0.6% by mass of silicon.Type: ApplicationFiled: April 24, 2024Publication date: October 31, 2024Inventors: Yukiko NAKAI, Michiaki ISHIKAWA, Yusuke TAKIGAURA, Junya ONISHI, Keiji ARAI
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Publication number: 20240337959Abstract: Disclosed is a method for producing an electrostatic charge image developing toner, including: drying wet toner base particles to produce the electrostatic charge image developing toner. The toner base particles contain an amorphous polyester that is a polycondensate of a polyvalent carboxylic acid and a polyhydric alcohol. In the amorphous polyester, a content of a structural unit derived from bisphenol A or a bisphenol A derivative is 10 mol % or less with respect to total moles of a structural unit derived from the polyhydric alcohol. The drying comprises drying the wet toner base particles with an airflow in a dryer. A temperature of the airflow is equal to or higher than 60° C. A velocity of the airflow is greater than or equal to 5 m/sec.Type: ApplicationFiled: March 29, 2024Publication date: October 10, 2024Inventors: Junya ONISHI, Yusuke TAKIGAURA, Yukiko NAKAI, Michiaki ISHIKAWA, Keiji ARAI
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Patent number: 11860570Abstract: A toner set includes a plurality of toners, wherein the toner set includes a first toner containing a yellow colorant and a second toner containing a cyan colorant, the first toner and the second toner each contain a binder resin containing a vinyl-based resin and a crystalline resin, and a release agent containing a hydrocarbon wax, a content of the vinyl-based resin with respect to a total mass of the binder resin is 50% by mass or more, the first toner contains the crystalline resin having a moiety having a crystal structure and a crystal nucleating agent moiety having a crystal nucleating agent, and the second toner contains the cyan colorant that is a compound represented by general formula (1).Type: GrantFiled: June 7, 2021Date of Patent: January 2, 2024Assignee: KONICA MINOLTA, INC.Inventors: Hiroshi Nagasawa, Yusuke Takigaura, Takaki Kawamura, Ami Motohashi, Natsuki Ito, Shiro Hirano
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Patent number: 11312865Abstract: An object of the present invention is to provide an image forming method capable of coating a photocurable varnish without unevenness on a toner image formed using an electrostatic latent image developing toner, and further having good adhesion between a varnish layer and the toner image. The image forming method of the present invention comprises: forming a toner image on a recording medium using an electrostatic latent image developing toner containing a toner particle comprising a binder resin and a release agent; and forming a varnish layer on the toner image by applying and curing a photocurable varnish comprising a photocurable compound. The binder resin comprised in the electrostatic latent image developing toner contains a crystalline polyester resin. The photocurable compound comprised in the photocurable varnish comprises a diol di(meth)acrylate having a straight hydrocarbon chain.Type: GrantFiled: September 3, 2020Date of Patent: April 26, 2022Assignee: KONICA MINOLTA, INC.Inventors: Takaki Kawamura, Noboru Ueda, Natsuki Ito, Yusuke Takigaura, Ami Motohashi
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Publication number: 20220004113Abstract: A toner set includes a plurality of toners, wherein the toner set includes a first toner containing a yellow colorant and a second toner containing a cyan colorant, the first toner and the second toner each contain a binder resin containing a vinyl-based resin and a crystalline resin, and a release agent containing a hydrocarbon wax, a content of the vinyl-based resin with respect to a total mass of the binder resin is 50% by mass or more, the first toner contains the crystalline resin having a moiety having a crystal structure and a crystal nucleating agent moiety having a crystal nucleating agent, and the second toner contains the cyan colorant that is a compound represented by general formula (1).Type: ApplicationFiled: June 7, 2021Publication date: January 6, 2022Inventors: Hiroshi NAGASAWA, Yusuke TAKIGAURA, Takaki KAWAMURA, Ami MOTOHASHI, Natsuki ITO, Shiro HIRANO
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Publication number: 20210095134Abstract: An object of the present invention is to provide an image forming method capable of coating a photocurable varnish without unevenness on a toner image formed using an electrostatic latent image developing toner, and further having good adhesion between a varnish layer and the toner image. The image forming method of the present invention comprises: forming a toner image on a recording medium using an electrostatic latent image developing toner containing a toner particle comprising a binder resin and a release agent; and forming a varnish layer on the toner image by applying and curing a photocurable varnish comprising a photocurable compound. The binder resin comprised in the electrostatic latent image developing toner contains a crystalline polyester resin. The photocurable compound comprised in the photocurable varnish comprises a diol di(meth)acrylate having a straight hydrocarbon chain.Type: ApplicationFiled: September 3, 2020Publication date: April 1, 2021Inventors: Takaki Kawamura, Noboru Ueda, Natsuki Ito, Yusuke Takigaura, Ami Motohashi
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Publication number: 20210063905Abstract: An electrostatic latent image developing toner set of the present invention is an electrostatic latent image developing toner set including at least a yellow toner, a magenta toner, and a cyan toner, wherein when exothermic peak top temperatures during decreasing temperature in differential scanning calorimetry of the yellow toner, the magenta toner, and the cyan toner are assumed to be P(Y), P(M), and P(C), respectively, the exothermic peak top temperatures satisfy the following expression (1). 70?P(Y)?P(M)?P(C)?90(° C.Type: ApplicationFiled: August 14, 2020Publication date: March 4, 2021Inventors: Takaki KAWAMURA, Noboru UEDA, Natsuki ITO, Yusuke TAKIGAURA, Ami MOTOHASHI
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Publication number: 20200379364Abstract: Provided is an electrostatic latent image developing toner capable of preventing a release agent from adhering to a member such as a paper conveying roller or the like. An electrostatic latent image developing toner contains at least a binder resin, a colorant, and a release agent, wherein the release agent contains at least an ester wax and the ester wax is an ester wax having a total carbon number of 45 or more and 71 or less, and a top temperature of an exothermic peak during cooling of the electrostatic latent image developing toner measured by a differential scanning calorimetry is within a range of 60° C. or higher and 85° C. or lower.Type: ApplicationFiled: May 27, 2020Publication date: December 3, 2020Inventors: Noboru UEDA, Aya SHIRAI, Takaki KAWAMURA, Natsuki ITO, Yusuke TAKIGAURA, Ami MOTOHASHI
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Publication number: 20200379365Abstract: An object of the present invention is to provide a new electrostatic latent image developing toner capable of suppressing adhesiveness of a release agent to a member such as a roller or the like and capable of suppressing gloss unevenness and gloss memory. An electrostatic latent image developing toner containing a binder resin, a release agent, and a colorant, wherein the binder resin contains a crystalline resin, the release agent contains a hydrocarbon wax having a branching degree of 3 to 52%, and a top temperature of an exothermic peak during cooling of the electrostatic latent image developing toner measured by a differential scanning calorimetry is within a range of 60 to 85° C.Type: ApplicationFiled: May 27, 2020Publication date: December 3, 2020Inventors: Aya SHIRAI, Noboru UEDA, Takaki KAWAMURA, Yusuke TAKIGAURA, Natsuki ITO, Ami MOTOHASHI
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Publication number: 20190310565Abstract: A toner for electrostatic charge image development includes: a toner base particle containing a binder resin; and an external additive containing a strontium titanate fine particle, wherein the binder resin contains an amorphous resin and a crystalline polyester resin, in which the crystalline polyester resin is a polycondensate of an aliphatic dicarboxylic acid having from 6 to 14 carbon atoms and an aliphatic diol having from 6 to 14 carbon atoms, and the strontium titanate fine particle contains a strontium titanate fine particle (A) and a strontium titanate fine particle (B), in which a particle diameter RA of a peak top in number particle size distribution of the strontium titanate fine particle (A) is smaller than a particle diameter RB of a peak top in number particle size distribution of the strontium titanate fine particle (B).Type: ApplicationFiled: February 26, 2019Publication date: October 10, 2019Inventors: Yusuke TAKIGAURA, Takanari Kayamori, Kaori Fujino, Ikuko Sakurada
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Patent number: 10203618Abstract: An electrostatic charge image developing toner includes a binder resin and a release agent. A ratio of a crystalline polyester resin to the total amount of a amorphous polyester resin and the crystalline polyester resin is within a range exceeding 40% by mass to 60% by mass. A temperature at which a storage modulus before heat left G? before being left to stand at a temperature of X° C. becomes 1.0×108 Pa is within a range exceeding 45° C. to 55° C. A storage modulus after heat left G? at a temperature of X?° C. at which a value of a ratio of the storage modulus after heat left G? at a temperature of X° C. after being left to stand at the temperature of X° C. for 2 hours to the storage modulus before heat left G? at the temperature of X° C. becomes the maximum is within a range of 1.0×108 to 5.0×108 Pa.Type: GrantFiled: January 26, 2018Date of Patent: February 12, 2019Assignee: KONICA MINOLTA, INC.Inventors: Yusuke Takigaura, Takaki Kawamura, Shiro Hirano
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Patent number: 10067435Abstract: An electrostatic charge image developing toner includes a particulate toner matrix containing a binder resin and an external additive. The binder resin includes an amorphous polyester resin, a crystalline resin, and an amorphous vinyl resin. A storage modulus G?0(t) measured before the toner is left and storage moduli G?Tm-10(t) and G?Tm-20(t) measured after the toner is left for three hours at temperatures (Tm-10)° C. and (Tm-20)° C., respectively, based on a melting point (Tm° C.) derived from the crystalline resin satisfy the relations represented by G?0(t)<G?Tm-10(t), G?0(t)<G?Tm-20(t), and G?Tm-10(x)/G?Tm-20(x)?1.5 in a temperature range A for measurement where the storage modulus G?0(t) is 1.0×106 Pa or more. The value t represents any temperature (° C.) for measurement in the temperature range A for measurement; and the value x represents the temperature (° C.) for measurement having a maximum difference between the storage moduli G?Tm-10(t) and G?Tm-20(t).Type: GrantFiled: October 18, 2017Date of Patent: September 4, 2018Assignee: KONICA MINOLTA, INC.Inventors: Takaki Kawamura, Shiro Hirano, Yusuke Takigaura
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Publication number: 20180217515Abstract: An electrostatic charge image developing toner includes a binder resin and a release agent. A ratio of a crystalline polyester resin to the total amount of a amorphous polyester resin and the crystalline polyester resin is within a range exceeding 40% by mass to 60% by mass. A temperature at which a storage modulus before heat left G? before being left to stand at a temperature of X° C. becomes 1.0×108 Pa is within a range exceeding 45° C. to 55° C. A storage modulus after heat left G? at a temperature of X?° C. at which a value of a ratio of the storage modulus after heat left G? at a temperature of X° C. after being left to stand at the temperature of X° C. for 2 hours to the storage modulus before heat left G? at the temperature of X° C. becomes the maximum is within a range of 1.0×108 to 5.0×108 Pa.Type: ApplicationFiled: January 26, 2018Publication date: August 2, 2018Inventors: Yusuke TAKIGAURA, Takaki KAWAMURA, Shiro HIRANO
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Publication number: 20180129146Abstract: An electrostatic charge image developing toner includes a particulate toner matrix containing a binder resin and an external additive. The binder resin includes an amorphous polyester resin, a crystalline resin, and an amorphous vinyl resin. A storage modulus G?0(t) measured before the toner is left and storage moduli G?Tm-10(t) and G?Tm-20(t) measured after the toner is left for three hours at temperatures (Tm-10)° C. and (Tm-20)° C., respectively, based on a melting point (Tm ° C.) derived from the crystalline resin satisfy the relations represented by G?0(t)<G?Tm-10(t), G?0(t)<G?Tm-20(t), and G?Tm-10(x)/G?Tm-20(x)?1.5 in a temperature range A for measurement where the storage modulus G?0(t) is 1.0×106 Pa or more. The value t represents any temperature (° C.) for measurement in the temperature range A for measurement; and the value x represents the temperature (° C.) for measurement having a maximum difference between the storage moduli G?Tm-10(t) and G?Tm-20(t).Type: ApplicationFiled: October 18, 2017Publication date: May 10, 2018Inventors: Takaki KAWAMURA, Shiro Hirano, Yusuke Takigaura