Patents by Inventor Ami MOTOHASHI
Ami MOTOHASHI 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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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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Patent number: 10698328Abstract: Provided is an electrostatic image developing toner including: toner mother particles containing a binder resin and a releasing agent; and an external additive, wherein the binder resin contains a crystalline resin, and the electrostatic image developing toner satisfies the following formulas (1) and (2), tan ?3° C./min<tan ?6° C./min??Formula (1): 0.0005?tan ?6° C./min?tan ?3° C./min,??Formula (2): wherein: tan ?6° C./min is a peak top value of a loss tangent when the loss tangent is measured from 25° C. to 100° C. at a frequency of 1 Hz and a heating rate of 6° C./min; and tan ?3° C./min is a peak top value of a loss tangent when the loss tangent is measured from 25° C. to 100° C. at a frequency of 1 Hz and a heating rate of 3° C./min.Type: GrantFiled: December 28, 2018Date of Patent: June 30, 2020Assignee: KONICA MINOLTA, INC.Inventors: Takaki Kawamura, Shiro Hirano, Junya Onishi, Ami Motohashi
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Patent number: 10627733Abstract: Provided is an image forming method using an electrostatic image developing toner containing: toner mother particles including a binder resin; and an external additive, wherein the binder resin contains a vinyl resin in an amount of 40 mass % or more with respect to the total amount of the binder resin, the image forming method including a step of: forming an image so that an image surface resistance value at 70° C. by a temperature change method of the formed image is set to be 5×1013 ? or less.Type: GrantFiled: October 17, 2018Date of Patent: April 21, 2020Assignee: KONICA MINOLTA, INC.Inventors: Tatsuya Fujisaki, Ami Motohashi, Takaki Kawamura
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Patent number: 10627734Abstract: In an image forming method according to the present invention, an image is formed by removing residual charge from the image on an image recording medium. The image forming method includes formation of an image for forming a toner image by fixing a toner on the image recording medium and application of voltage from a voltage applier, the voltage having a polarity reverse to a polarity of a surface potential of the toner image. The toner includes toner base particles and an external additive. The toner base particles include a crystalline polyester resin.Type: GrantFiled: November 9, 2018Date of Patent: April 21, 2020Assignee: KONICA MINOLTA, INC.Inventors: Junya Onishi, Kentarou Mogi, Ami Motohashi, Shiro Hirano
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Publication number: 20190258185Abstract: Provided is an electrostatic image developing toner including: toner mother particles containing a binder resin and a releasing agent; and an external additive, wherein the binder resin contains a crystalline resin, and the electrostatic image developing toner satisfies the following formulas (1) and (2), tan ?3° C./min<tan ?6° C./min??Formula (1): 0.0005?tan ?6° C./min?tan ?3° C./min,??Formula (2): wherein: tan ?6° C./min is a peak top value of a loss tangent when the loss tangent is measured from 25° C. to 100° C. at a frequency of 1 Hz and a heating rate of 6° C./min; and tan ?3° C./min is a peak top value of a loss tangent when the loss tangent is measured from 25° C. to 100° C. at a frequency of 1 Hz and a heating rate of 3° C./min.Type: ApplicationFiled: December 28, 2018Publication date: August 22, 2019Inventors: Takaki KAWAMURA, Shiro HIRANO, Junya ONISHI, Ami MOTOHASHI
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Publication number: 20190187577Abstract: Provided is an image forming method using an electrostatic image developing toner containing: toner mother particles including a binder resin; and an external additive, wherein the binder resin contains a vinyl resin in an amount of 40 mass % or more with respect to the total amount of the binder resin, the image forming method including a step of: forming an image so that an image surface resistance value at 70° C. by a temperature change method of the formed image is set to be 5×1013 ? or less.Type: ApplicationFiled: October 17, 2018Publication date: June 20, 2019Inventors: Tatsuya FUJISAKI, Ami MOTOHASHI, Takaki KAWAMURA
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Publication number: 20190163095Abstract: In an image forming method according to the present invention, an image is formed by removing residual charge from the image on an image recording medium. The image forming method includes formation of an image for forming a toner image by fixing a toner on the image recording medium and application of voltage from a voltage applier, the voltage having a polarity reverse to a polarity of a surface potential of the toner image. The toner includes toner base particles and an external additive. The toner base particles include a crystalline polyester resin.Type: ApplicationFiled: November 9, 2018Publication date: May 30, 2019Inventors: Junya ONISHI, Kentarou MOGI, Ami MOTOHASHI, Shiro HIRANO