Patents by Inventor Tomio Segawa

Tomio Segawa 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).

  • Process for producing a copper phthalocyanine compound
    Patent number: 5153314
    Abstract: A process for producing a copper phthalocyanine compound, which comprises heating and reacting phthalic acid or a phthalic acid derivative, urea or a urea derivative and cuprous chloride in the presence of a catalyst in an inert organic solvent, wherein the cuprous chloride is used in an amount of from 95 to 99% of the stoichiometric amount relative to the phthalic acid or the phthalic acid derivative.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: October 6, 1992
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Tomio Segawa, Kazuhiro Maruyama, Tadashi Ninomiya, Motokazu Suyama
  • Process for producing a metal phthalocyanine and/or its derivative
    Patent number: 4906747
    Abstract: In a process for producing a metal phthalocyanine and/or its derivative by heating phthalic anhydride and/or its derivative, urea and a metal compound in an organic solvent in the presence of a catalyst, or by heating phthalodinitrile and a metal or a metal compound in an organic solvent, the improvement wherein the reaction for the production of the metal phthalocyanine and/or its derivative is conducted by an addition of cyanuric acid and/or its derivative.
    Type: Grant
    Filed: December 15, 1988
    Date of Patent: March 6, 1990
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Tomio Segawa, Kazuhiro Maruyama, Tadashi Ninomiya, Motokazu Suyama
  • Process for producing highly chlorinated copper phthalocyanine
    Patent number: 4330470
    Abstract: A highly chlorinated copper phthalocyanine is produced by chlorinating a copper phthalocyanine in the presence of a catalyst for chlorination in a solvent by charging chlorine under an elevated pressure. The chlorination is carried out in an inert organic solvent incorporating chlorosulfonic acid and/or pyrosulfuryl chloride at a ratio of 1 to 30 wt. % based on said inert organic solvent which maintain dispersibility of said resulting highly chlorinated copper phthalocyanine.
    Type: Grant
    Filed: December 18, 1980
    Date of Patent: May 18, 1982
    Assignee: Kawasaki Kasei Chemicals Ltd.
    Inventors: Tomio Segawa, Sakae Kuramoto
  • Process for producing highly chlorinated copper phthalocyanine
    Patent number: 4218376
    Abstract: Highly chlorinated copper phthalocyanine is produced by charging chlorine under an elevated pressure of 1 to 20 Kg/cm.sup.2 (gauge) into a solution of a copper phthalocyanine in the presence of pyrosulfuryl chloride and a catalyst of sulfur or sulfur chloride.Pyrosulfuryl chloride can be formed by a reaction of chlorosulfonic acid with chlorine and sulfur or sulfur chloride under an elevated pressure.An auxiliary catalyst of iodine, iodine chloride or a metal chloride can be incorporated to improve the chlorination.
    Type: Grant
    Filed: November 21, 1978
    Date of Patent: August 19, 1980
    Assignee: Kawasaki Kasei Chemicals Limited
    Inventors: Ryo Matsuura, Tomio Segawa, Yukio Nomiyama, Yoichi Kumada, Hideo Sawada