Patents by Inventor Akihide Hagino

Akihide Hagino 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 a polymerized toner
    Patent number: 9454093
    Abstract: Disclosed is a method for producing a polymerized toner, wherein the method comprises: a suspension step of obtaining a suspension in which droplets of a first-stage polymerizable monomer composition containing at least a first-stage polymerizable monomer and a colorant are dispersed, by suspending the first-stage polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer; a first-stage polymerization step of carrying out suspension polymerization by using the suspension, in the presence of a polymerization initiator; and a second-stage polymerization step of carrying out suspension polymerization by further adding a second-stage polymerizable monomer satisfying the following formula (1), when a polymerization conversion rate in the first-stage polymerization step becomes 20 to 80%: Tg1>Tg2.
    Type: Grant
    Filed: January 24, 2014
    Date of Patent: September 27, 2016
    Assignee: ZEON CORPORATION
    Inventors: Hisashi Kurokawa, Akihide Hagino, Hiroyuki Taguchi
  • METHOD FOR PRODUCING A POLYMERIZED TONER
    Publication number: 20150370185
    Abstract: Disclosed is a method for producing a polymerized toner, wherein the method comprises: a suspension step of obtaining a suspension in which droplets of a first-stage polymerizable monomer composition containing at least a first-stage polymerizable monomer and a colorant are dispersed, by suspending the first-stage polymerizable monomer composition in an aqueous dispersion medium containing a dispersion stabilizer; a first-stage polymerization step of carrying out suspension polymerization by using the suspension, in the presence of a polymerization initiator; and a second-stage polymerization step of carrying out suspension polymerization by further adding a second-stage polymerizable monomer satisfying the following formula (1), when a polymerization conversion rate in the first-stage polymerization step becomes 20 to 80%: Tg1>Tg2??Formula (1):
    Type: Application
    Filed: January 24, 2014
    Publication date: December 24, 2015
    Applicant: ZEON CORPORATION
    Inventors: Hisashi Kurokawa, Akihide Hagino, Hiroyuki Taguchi
  • Method of producing polymerized toner
    Patent number: 7462435
    Abstract: The present invention aims to provide a method of producing a polymerized toner which is small in an amount of a microparticle produced as a by-product and an amount of a polymerizable monomer remained, generates no filming upon printing and is excellent in printing durability, and provides a method of producing a polymerized toner comprising the steps of: (A) preparing a polymerizable monomer composition containing at least a polymerizable monomer and a colorant; (B) obtaining a polymerizable monomer composition dispersion by adding the polymerizable monomer composition in an aqueous medium containing a dispersion stabilizer, thereby to form droplets of the polymerizable monomer composition; and (C) obtaining a colored polymer particle by heating the polymerizable monomer composition dispersion to polymerize the polymerizable monomer composition, wherein the polymerizable monomer composition dispersion contains a water-soluble polymerization inhibitor and a thiuram disulfide.
    Type: Grant
    Filed: May 31, 2006
    Date of Patent: December 9, 2008
    Assignee: Zeon Corporation
    Inventor: Akihide Hagino
  • Method of producing polymerized toner
    Publication number: 20060269866
    Abstract: The present invention aims to provide a method of producing a polymerized toner which is small in an amount of a microparticle produced as a by-product and an amount of a polymerizable monomer remained, generates no filming upon printing and is excellent in printing durability, and provides a method of producing a polymerized toner comprising the steps of: (A) preparing a polymerizable monomer composition containing at least a polymerizable monomer and a colorant; (B) obtaining a polymerizable monomer composition dispersion by adding the polymerizable monomer composition in an aqueous medium containing a dispersion stabilizer, thereby to form droplets of the polymerizable monomer composition; and (C) obtaining a colored polymer particle by heating the polymerizable monomer composition dispersion to polymerize the polymerizable monomer composition, wherein the polymerizable monomer composition dispersion contains a water-soluble polymerization inhibitor and a thiuram disulfide.
    Type: Application
    Filed: May 31, 2006
    Publication date: November 30, 2006
    Applicant: ZEON CORPORATION
    Inventor: Akihide Hagino