Patents by Inventor Junya Koeda

Junya Koeda 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).

  • Patent number: 8557497
    Abstract: A method of manufacturing toner including preparing a first liquid by dissolving or dispersing toner components including one or both of a binder resin and a precursor thereof in an organic solvent; preparing a second liquid by dispersing the first liquid in a first aqueous medium including a dispersant; producing primary particles by removing the organic solvent from the second liquid; washing the primary particles; preparing a third liquid by dispersing the washed primary particles in a second aqueous medium and heating the second aqueous medium while or after dispersing the washed primary particles therein; and producing toner particles by adding a charge controlling agent to the third liquid. This method satisfies the following inequation: 0.60?Sb/Sa?1.00 wherein Sa represents a BET specific surface area of the primary particles included in the third liquid and Sb represents that of the toner particles stored for 2 weeks at 40° C., 70% RH.
    Type: Grant
    Filed: December 6, 2010
    Date of Patent: October 15, 2013
    Assignee: Ricoh Company, Limited
    Inventors: Junichi Watanabe, Kenichi Uehara, Junya Koeda, Daisuke Misawa, Keisuke Tada, Miyuki Hirata
  • Publication number: 20110136052
    Abstract: A method of manufacturing toner including preparing a first liquid by dissolving or dispersing toner components including one or both of a binder resin and a precursor thereof in an organic solvent; preparing a second liquid by dispersing the first liquid in a first aqueous medium including a dispersant; producing primary particles by removing the organic solvent from the second liquid; washing the primary particles; preparing a third liquid by dispersing the washed primary particles in a second aqueous medium and heating the second aqueous medium while or after dispersing the washed primary particles therein; and producing toner particles by adding a charge controlling agent to the third liquid. This method satisfies the following inequation: 0.60?Sb/Sa?1.00 wherein Sa represents a BET specific surface area of the primary particles included in the third liquid and Sb represents that of the toner particles stored for 2 weeks at 40° C., 70% RH.
    Type: Application
    Filed: December 6, 2010
    Publication date: June 9, 2011
    Inventors: Junichi WATANABE, Kenichi Uehara, Junya Koeda, Daisuke Misawa, Keisuke Tada, Miyuki Hirata
  • Patent number: 7011921
    Abstract: A method of producing a toner composition, including stirring and mixing toner particles comprising a binder resin, a colorant and a release agent with a charge controlling agent in a fluidizing and stirring mixer comprising a rotor having a stirring blade to fix the charge controlling agent on a surface of the toner particles, wherein the stirring and mixing comprises rotating the rotor at a peripheral speed of from 65 to 120 m/s at an environmental temperature (T) in the fluidizing and stirring mixer, satisfying the relationship,Tg-10>T>Tg-35(° C.), where the Tg represents a glass transition temperature of the binder resin.
    Type: Grant
    Filed: August 12, 2003
    Date of Patent: March 14, 2006
    Assignee: Ricoh Company, Ltd.
    Inventors: Junya Koeda, Kenichi Uehara, Hiroyuki Yoshikawa, Osamu Kouzu
  • Publication number: 20060039234
    Abstract: A method of producing a toner composition, including stirring and mixing toner particles comprising a binder resin, a colorant and a release agent with a charge controlling agent in a fluidizing and stirring mixer comprising a rotor having a stirring blade to fix the charge controlling agent on a surface of the toner particles, wherein the stirring and mixing comprises rotating the rotor at a peripheral speed of from 65 to 120 m/s at an environmental temperature (T) in the fluidizing and stirring mixer, satisfying the relationship, Tg-10>T>Tg-35(° C.), where the Tg represents a glass transition temperature of the binder resin.
    Type: Application
    Filed: October 28, 2005
    Publication date: February 23, 2006
    Inventors: Junya Koeda, Kenichi Uehara, Hiroyuki Yoshikawa, Osamu Kouzu
  • Publication number: 20040097623
    Abstract: A method of producing a toner composition, including stirring and mixing toner particles comprising a binder resin, a colorant and a release agent with a charge controlling agent in a fluidizing and stirring mixer comprising a rotor having a stirring blade to fix the charge controlling agent on a surface of the toner particles, wherein the stirring and mixing comprises rotating the rotor at a peripheral speed of from 65 to 120 m/s at an environmental temperature (T) in the fluidizing and stirring mixer, satisfying the relationship,Tg-10>T>Tg-35(° C.), where the Tg represents a glass transition temperature of the binder resin.
    Type: Application
    Filed: August 12, 2003
    Publication date: May 20, 2004
    Inventors: Junya Koeda, Kenichi Uehara, Hiroyuki Yoshikawa, Osamu Kouzu