Patents by Inventor Yuuichi Ayuta

Yuuichi Ayuta 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).

  • Pigment composition for printing ink, method for producing the same and method for producing printing ink
    Patent number: 8754148
    Abstract: The present invention provides a method for producing a pigment composition for a printing ink, which involves the step of dry-milling crude copper phthalocyanine using calcium carbonate having a specific property; a pigment composition for a printing ink; and a method for producing a printing ink using the pigment composition. Specifically, the present invention provides a method for producing a pigment composition for a printing ink, which involves the step of dry-milling crude copper phthalocyanine and calcium carbonate having a primary particle diameter of 20 to 1500 nm in the absence of a resin for a printing ink; a pigment composition produced by the method; and a method for producing a printing ink, which includes the steps of heating a mixture of a pigment composition, a resin for a printing ink and a solvent for the printing ink, and wet-milling the heated mixture.
    Type: Grant
    Filed: December 19, 2008
    Date of Patent: June 17, 2014
    Assignee: DIC Corporation
    Inventors: Yoshiharu Ootoshi, Masayoshi Takahashi, Yuuichi Ayuta
  • PIGMENT COMPOSITION FOR PRINTING INK, METHOD FOR PRODUCING THE SAME AND METHOD FOR PRODUCING PRINTING INK
    Publication number: 20100331460
    Abstract: The present invention provides a method for producing a pigment composition for a printing ink, which involves the step of dry-milling crude copper phthalocyanine using calcium carbonate having a specific property; a pigment composition for a printing ink; and a method for producing a printing ink using the pigment composition. Specifically, the present invention provides a method for producing a pigment composition for a printing ink, which involves the step of dry-milling crude copper phthalocyanine and calcium carbonate having a primary particle diameter of 20 to 1500 nm in the absence of a resin for a printing ink; a pigment composition produced by the method; and a method for producing a printing ink, which includes the steps of heating a mixture of a pigment composition, a resin for a printing ink and a solvent for the printing ink, and wet-milling the heated mixture.
    Type: Application
    Filed: December 19, 2008
    Publication date: December 30, 2010
    Applicant: DIC CORPORATION
    Inventors: Yoshiharu Ootoshi, Masayoshi Takahashi, Yuuichi Ayuta