Patents by Inventor Yoshihiko Moro-Oka

Yoshihiko Moro-Oka 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).

  • Crystallizable poly (2,5-di-substituted-1,4-phenylene oxide) and a method of preparing the same
    Patent number: 6841650
    Abstract: There is disclosed a crystallizable poly(2,5-di-substituted-1,4-phenylene oxide), which exhibits an exothermic peak for crystallization of not less than 5 J/g at 150° C. or over when cooled after melting, and/or an endothermic peak, at the time of melting of crystals thereof, of not less than 5 J/g at 150° C. or over when re-heated after cooling of the melt, and which comprises a recurring unit of the following formula (I), and a method of preparing the same by polymerization of a 2,5-di-substituted-phenol of the following formula (II) by use of a copper complex catalyst made of a tridentate ligand of which nitrogen atoms coordinate to a copper atom in coexistence with oxygen: wherein R1's independently represent a hydrocarbon group or a substituted hydrocarbon group, and they may be the same or different. The crystallizable poly(2,5-di-substituted-1,4-phenylene oxide) is able to provide a melt molding which has a reduced degree of coloration and good heat resistance.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: January 11, 2005
    Assignees: National Institute of Advanced Industrial Science and Technology, Japan Chemical Innovation Institute
    Inventors: Hideyuki Higashimura, Kiyoshi Fujisawa, Yoshihiko Moro-Oka, Shiro Kobayashi
  • Crystallizable poly (2,5-di-substituted-1,4-phenylene oxide) and a method of preparing the same
    Patent number: 6541596
    Abstract: There is disclosed a crystallizable poly(2,5-di-substituted-1,4-phenylene oxide), which exhibits an exothermic peak for crystallization of not less than 5 J/g at 150° C. or over when cooled after melting, and/or an endothermic peak, at the time of melting of crystals thereof, of not less than 5 J/g at 150° C. or over when re-heated after cooling of the melt, and which comprises a recurring unit of the following formula (I), and a method of preparing the same by polymerization of a 2,5-di-substituted-phenol of the following formula (II) by use of a copper complex catalyst made of a tridentate ligand of which nitrogen atoms coordinate to a copper atom in coexistence with oxygen: wherein R1's independently represent a hydrocarbon group or a substituted hydrocarbon group, and they may be the same or different. The crystallizable poly(2,5-di-substituted-1,4-phenylene oxide) is able to provide a melt molding which has a reduced degree of coloration and good heat resistance.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: April 1, 2003
    Assignees: Secretary of Agency of Industrial Science and Technology, Japan Chemical Innovation Institute
    Inventors: Hideyuki Higashimura, Kiyoshi Fujisawa, Yoshihiko Moro-oka, Shiro Kobayashi
  • Crystallizable poly (2,5-di-substituted-1,4-phenylene oxide) and a method of preparing the same
    Publication number: 20020183475
    Abstract: There is disclosed a crystallizable poly(2,5-di-substituted-1,4-phenylene oxide), which exhibits an exothermic peak for crystallization of not less than 5 J/g at 150° C. or over when cooled after melting, and/or an endothermic peak, at the time of melting of crystals thereof, of not less than 5 J/g at 150° C.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 5, 2002
    Applicant: Secretary of Agency of Industrial Science and Technology
    Inventors: Hideyuki Higashimura, Kiyoshi Fujisawa, Yoshihiko Moro-Oka, Shiro Kobayashi