Patents by Inventor Kiyotaka Bito

Kiyotaka Bito 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 polyalkylene oxide
    Patent number: 8481788
    Abstract: The present invention aims to provide a method for producing a polyalkylene oxide, which is capable of improving reduction in reactivity of a double metal cyanide complex catalyst in the case that a low molecular weight initiator is used, and producing the polyalkylene oxide with high productivity at low cost. The method for producing a polyalkylene oxide comprises carrying out a ring-opening addition reaction of an alkylene oxide with an initiator having at least one hydroxy group and having a molecular weight of not more than 300 per hydroxy group in the presence of a double metal cyanide complex catalyst in an organic solvent, wherein the organic solvent is used in an amount of 500 to 1,500 parts by weight relative to 100 parts by weight of the alkylene oxide used at the start of the reaction.
    Type: Grant
    Filed: January 21, 2009
    Date of Patent: July 9, 2013
    Assignee: Kaneka Corporation
    Inventors: Hidetoshi Odaka, Takuya Maeda, Kiyotaka Bito, Michihide Homma
  • PROCESS FOR PRODUCING POLYALKYLENE OXIDE
    Publication number: 20110028682
    Abstract: The present invention aims to provide a method for producing a polyalkylene oxide, which is capable of improving reduction in reactivity of a double metal cyanide complex catalyst in the case that a low molecular weight initiator is used, and producing the polyalkylene oxide with high productivity at low cost. The method for producing a polyalkylene oxide comprises carrying out a ring-opening addition reaction of an alkylene oxide with an initiator having at least one hydroxy group and having a molecular weight of not more than 300 per hydroxy group in the presence of a double metal cyanide complex catalyst in an organic solvent, wherein the organic solvent is used in an amount of 500 to 1,500 parts by weight relative to 100 parts by weight of the alkylene oxide used at the start of the reaction.
    Type: Application
    Filed: January 21, 2009
    Publication date: February 3, 2011
    Applicant: KANEKA CORPORATION
    Inventors: Hidetoshi Odaka, Takuya Maeda, Kiyotaka Bito, Michihide Homma