Patents by Inventor Hitoshi SHIBASHITA

Hitoshi SHIBASHITA 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 polyolefin
    Patent number: 10011667
    Abstract: A method for producing a polyolefin is provided. The method includes a step of feeding a polyolefin powder having a catalytic activity into a gas phase polymerization vessel in which there is a polyolefin powder and through which a gas comprising an olefin is being circulated, thereby commencing polymerization of an olefin. The following formula (1) is satisfied: 0.5<?/(?B)<24.0??(1) In formula (1), ? represents the median diameter (?m) of the catalytically active polyolefin powder to be fed into the vapor phase polymerization vessel, ? represents the median diameter (?m) of the polyolefin powder that is contained in the vapor phase polymerization vessel before the feeding of the catalytically active polyolefin powder into the vapor phase polymerization vessel, and B represents the linear gas velocity (m/sec) of the gas containing an olefin within the vapor phase polymerization vessel.
    Type: Grant
    Filed: April 10, 2017
    Date of Patent: July 3, 2018
    Assignee: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Satoshi Itoguchi, Hitoshi Shibashita
  • METHOD FOR PRODUCING POLYOLEFIN
    Publication number: 20170291970
    Abstract: A method for producing a polyolefin is provided. The method includes a step of feeding a polyolefin powder having a catalytic activity into a gas phase polymerization vessel in which there is a polyolefin powder and through which a gas comprising an olefin is being circulated, thereby commencing polymerization of an olefin. The following formula (1) is satisfied: 0.5<?/(?B)<24.0??(1) In formula (1), ? represents the median diameter (?m) of the catalytically active polyolefin powder to be fed into the vapor phase polymerization vessel, ? represents the median diameter (?m) of the polyolefin powder that is contained in the vapor phase polymerization vessel before the feeding of the catalytically active polyolefin powder into the vapor phase polymerization vessel, and B represents the linear gas velocity (m/sec) of the gas containing an olefin within the vapor phase polymerization vessel.
    Type: Application
    Filed: April 10, 2017
    Publication date: October 12, 2017
    Inventors: Satoshi ITOGUCHI, Hitoshi SHIBASHITA