Patents by Inventor Arisa YAMAMOTO

Arisa YAMAMOTO 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).

  • Method for producing toner for electrophotography
    Patent number: 10578987
    Abstract: The present invention relates to a process for producing a toner for electrophotography that is excellent in the low-temperature fusing property, the initial image quality after storage, and the document offset property. A process for producing a toner for electrophotography, including step 1: melt-mixing a mixture containing a crystalline resin (C) and ester wax (W) having a dipentaerythritol unit as a constitutional component, wherein a difference |Cmp?Wmp| between a melting point Cmp of the crystalline resin (C) and a melting point Wmp of the ester wax (W) is 30° C. or less, and the melt-mixing is performed at a temperature Kt that is the melting point Cmp or more and the melting point Wmp or more.
    Type: Grant
    Filed: February 17, 2017
    Date of Patent: March 3, 2020
    Assignee: KAO CORPORATION
    Inventors: Shogo Watanabe, Kotaro Shimada, Arisa Yamamoto
  • METHOD FOR PRODUCING TONER FOR ELECTROPHOTOGRAPHY
    Publication number: 20190227448
    Abstract: The present invention relates to a process for producing a toner for electrophotography that is excellent in the low-temperature fusing property, the initial image quality after storage, and the document offset property. A process for producing a toner for electrophotography, including step 1: melt-mixing a mixture containing a crystalline resin (C) and ester wax (W) having a dipentaerythritol unit as a constitutional component, wherein a difference |Cmp?Wmp| between a melting point Cmp of the crystalline resin (C) and a melting point Wmp of the ester wax (W) is 30° C. or less, and the melt-mixing is performed at a temperature Kt that is the melting point Cmp or more and the melting point Wmp or more.
    Type: Application
    Filed: February 17, 2017
    Publication date: July 25, 2019
    Applicant: KAO CORPORATION
    Inventors: Shogo WATANABE, Kotaro SHIMADA, Arisa YAMAMOTO