Patents by Inventor Wataru Hirahata

Wataru Hirahata 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).

  • Publication number: 20140206829
    Abstract: The present invention provides novel bimetallic complexes and methods of using the same in the isoselective polymerization of epoxides. The invention also provides methods of kinetic resolution of epoxides. The invention further provides polyethers with high enantiomeric excess that are useful in applications ranging from consumer goods to materials.
    Type: Application
    Filed: March 21, 2014
    Publication date: July 24, 2014
    Applicant: Cornell University
    Inventors: Geoffrey W. Coates, Wataru Hirahata
  • Patent number: 8710283
    Abstract: The present invention provides novel bimetallic complexes and methods of using the same in the isoselective polymerization of epoxides. The invention also provides methods of kinetic resolution of epoxides. The invention further provides polyethers with high enantiomeric excess that are useful in applications ranging from consumer goods to materials.
    Type: Grant
    Filed: September 21, 2012
    Date of Patent: April 29, 2014
    Assignee: Cornell University
    Inventors: Geoffrey W. Coates, Wataru Hirahata
  • Patent number: 8288488
    Abstract: The present invention aims at providing a process for producing a solid catalyst for olefin polymerization, the solid catalyst component being capable of providing a polymer having high stereoregularity when an ?-olefin is polymerized; a process for producing a solid catalyst component, which is used for producing the solid catalyst; and a process for producing an olefin polymer using the solid catalyst. This object can be achieved by a process for producing a solid catalyst component (A), the process including a step of bringing a titanium compound (a), a magnesium compound (b) and an internal electron donor represented by Formula (I) into contact with each other: where R1 is a hydrocarbyl group having 1 to 20 carbon atoms; R2, R3, R4, and R5 are each independently selected from a hydrogen atom, a halogen atom and a hydrocarbyl group having 1 to 20 carbon atoms, and at least one selected from R2, R3, R4, and R5 is a hydrocarbyl group having 1 to 20 carbon atoms; and R6 is a halogen atom.
    Type: Grant
    Filed: April 26, 2011
    Date of Patent: October 16, 2012
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Yasuki Fujiwara, Wataru Hirahata, Hirofumi Hamaki
  • Patent number: 8247510
    Abstract: A homopolymer having a monomer unit such as an isopropylidene diallylmalonate unit; a process for producing said homopolymer comprising the step of homopolymerising a monomer such as isopropylidene diallylmalonate; a copolymer containing said monomer unit and an ethylene unit and/or ?-olefin unit; and a process for producing said copolymer comprising the step of copolymerizing a monomer such as isopropylidene diallylmalonate with at least ethylene and/or an ?-olefin.
    Type: Grant
    Filed: July 15, 2011
    Date of Patent: August 21, 2012
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kohtaro Osakada, Daisuke Takeuchi, Sehoon Park, Masayuki Fujita, Wataru Hirahata
  • Patent number: 8236908
    Abstract: A solid catalyst component for olefin polymerization comprising a titanium atom, a magnesium atom, a halogen atom, and a cycloheptapolyenedicarboxylic diester; a production method of the solid catalyst component, by contacting with one another a titanium compound, a magnesium compound, and the cycloheptapolyenedicarboxylic diester; a production method of a solid catalyst, by contacting the solid catalyst component with an organoaluminum compound; and a production method of an olefin polymer by polymerizing an olefin in the presence of the solid catalyst.
    Type: Grant
    Filed: April 5, 2011
    Date of Patent: August 7, 2012
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Hidenori Hanaoka, Masaya Tanimoto
  • Patent number: 8105970
    Abstract: A solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and a defined internal electron donor such as dodecanedioyl dichloride; a production process of such a solid catalyst component, using a titanium compound, a magnesium compound, and the above internal electron donor, or using a solid component containing a titanium atom and a magnesium atom, and the above internal electron donor; a production process of a solid catalyst, using (i) the above solid catalyst component, (ii) an organoaluminum compound, and (iii) an external electron donor; and a production process of an olefin polymer using the above solid catalyst.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: January 31, 2012
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Mitsuhiro Okada, Wataru Hirahata
  • Publication number: 20110288250
    Abstract: A homopolymer having a monomer unit such as an isopropylidene diallylmalonate unit; a process for producing said homopolymer comprising the step of homopolymerising a monomer such as isopropylidene diallylmalonate; a copolymer containing said monomer unit and an ethylene unit and/or ?-olefin unit; and a process for producing said copolymer comprising the step of copolymerizing a monomer such as isopropylidene diallylmalonate with at least ethylene and/or an ?-olefin.
    Type: Application
    Filed: July 15, 2011
    Publication date: November 24, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Kohtaro OSAKADA, Daisuke TAKEUCHI, Sehoon PARK, Masayuki FUJITA, Wataru HIRAHATA
  • Publication number: 20110269929
    Abstract: The present invention aims at providing a process for producing a solid catalyst for olefin polymerization, the solid catalyst component being capable of providing a polymer having high stereoregularity when an ?-olefin is polymerized; a process for producing a solid catalyst component, which is used for producing the solid catalyst; and a process for producing an olefin polymer using the solid catalyst. This object can be achieved by a process for producing a solid catalyst component (A), the process including a step of bringing a titanium compound (a), a magnesium compound (b) and an internal electron donor represented by Formula (I) into contact with each other: where R1 is a hydrocarbyl group having 1 to 20 carbon atoms; R2, R3, R4, and R5 are each independently selected from a hydrogen atom, a halogen atom and a hydrocarbyl group having 1 to 20 carbon atoms, and at least one selected from R2, R3, R4, and R5 is a hydrocarbyl group having 1 to 20 carbon atoms; and R6 is a halogen atom.
    Type: Application
    Filed: April 26, 2011
    Publication date: November 3, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Yasuki FUJIWARA, Wataru HIRAHATA, Hirofumi HAMAKI
  • Publication number: 20110269928
    Abstract: The present invention aims at providing a solid catalyst component for olefin polymerization, the solid catalyst composed being capable of showing a sufficiently high polymerization activity and providing a polymer having a low content of a low molecular weight component or an amorphous component; a process for producing the solid catalyst component; and a process for producing a solid catalyst for olefin polymerization, and a process for producing an olefin polymer.
    Type: Application
    Filed: April 26, 2011
    Publication date: November 3, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Yasuki FUJIWARA, Wataru HIRAHATA
  • Publication number: 20110269927
    Abstract: A solid catalyst component for olefin polymerization comprising a titanium atom, a magnesium atom, a halogen atom, and a cycloheptapolyenedicarboxylic diester; a production method of the solid catalyst component, by contacting with one another a titanium compound, a magnesium compound, and the cycloheptapolyenedicarboxylic diester; a production method of a solid catalyst, by contacting the solid catalyst component with an organoaluminum compound; and a production method of an olefin polymer by polymerizing an olefin in the presence of the solid catalyst.
    Type: Application
    Filed: April 5, 2011
    Publication date: November 3, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Wataru HIRAHATA, Hidenori HANAOKA, Masaya TANIMOTO
  • Patent number: 8044159
    Abstract: A homopolymer having a monomer unit such as an isopropylidene diallylmalonate unit; a process for producing said homopolymer comprising the step of homopolymerising a monomer such as isopropylidene diallylmalonate; a copolymer containing said monomer unit and an ethylene unit and/or ?-olefin unit; and a process for producing said copolymer comprising the step of copolymerizing a monomer such as isopropylidene diallylmalonate with at least ethylene and/or an ?-olefin.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: October 25, 2011
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kohtaro Osakada, Daisuke Takeuchi, Sehoon Park, Masayuki Fujita, Wataru Hirahata
  • Publication number: 20110245439
    Abstract: A solid catalyst component for olefin polymerization containing a titanium atom, a magnesium atom, a halogen atom, and a defined internal electron donor such as dodecanedioyl dichloride; a production process of such a solid catalyst component, using a titanium compound, a magnesium compound, and the above internal electron donor, or using a solid component containing a titanium atom and a magnesium atom, and the above internal electron donor; a production process of a solid catalyst, using (i) the above solid catalyst component, (ii) an organoaluminum compound, and (iii) an external electron donor; and a production process of an olefin polymer using the above solid catalyst.
    Type: Application
    Filed: March 22, 2011
    Publication date: October 6, 2011
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Mitsuhiro OKADA, Wataru HIRAHATA
  • Patent number: 7939460
    Abstract: A production process is provided for an olefin polymerization catalyst component precursor, including the steps of (I) adding an organomagnesium compound to a solution containing a solvent, a Si—O bond-containing silicon compound, and a defined titanium compound, under agitation, and continuing the agitation until a magnesium concentration in a liquid phase of a reaction mixture decreases to 9 ppm by weight or lower, and (II) solid-liquid separating the reaction mixture. A production process is also provided for an olefin polymerization catalyst component using the above precursor. Further, producing process is provided for an olefin polymerization catalyst using the above catalyst component. Still further, a production process is provided for an olefin polymer using the above catalyst.
    Type: Grant
    Filed: October 9, 2009
    Date of Patent: May 10, 2011
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Shinya Nakahara
  • Publication number: 20100174038
    Abstract: A production process is provided for an olefin polymerization catalyst component precursor, including the step of adding an organomagnesium compound to a solution containing a Si—O bond-containing silicon compound, a titanium compound represented by a defined formula, and a solvent, in an amount of 2.5 to 90 mol, per one liter of the solvent, of magnesium atoms contained in the organomagnesium compound added. Also provided are a production process of an olefin polymerization catalyst component using the above precursor; a production process of an olefin polymerization catalyst using the above catalyst component; and a production process of an olefin polymer using the above catalyst.
    Type: Application
    Filed: December 11, 2009
    Publication date: July 8, 2010
    Applicant: SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Wataru HIRAHATA, Shinya NAKAHARA
  • Publication number: 20100144969
    Abstract: The present invention provides novel bimetallic complexes and methods of using the same in the isoselective polymerization of epoxides. The invention also provides methods of kinetic resolution of epoxides. The invention further provides polyethers with high enantiomeric excess that are useful in applications ranging from consumer goods to materials.
    Type: Application
    Filed: February 16, 2010
    Publication date: June 10, 2010
    Applicant: CORNELL UNIVERSITY
    Inventors: Geoffrey W. Coates, Wataru Hirahata
  • Publication number: 20100125125
    Abstract: A production process is provided for an olefin polymerization catalyst component precursor, including the steps of (I) adding an organomagnesium compound to a solution containing a solvent, a Si—O bond-containing silicon compound, and a defined titanium compound, under agitation, and continuing the agitation until a magnesium concentration in a liquid phase of a reaction mixture decreases to 9 ppm by weight or lower, and (II) solid-liquid separating the reaction mixture. A production process is also provided for an olefin polymerization catalyst component using the above precursor. Further, producing process is provided for an olefin polymerization catalyst using the above catalyst component. Still further, a production process is provided for an olefin polymer using the above catalyst.
    Type: Application
    Filed: October 9, 2009
    Publication date: May 20, 2010
    Applicant: Sumitomo Chemical Company, Limited
    Inventors: Wataru HIRAHATA, Shinya NAKAHARA
  • Publication number: 20090171054
    Abstract: A homopolymer having a monomer unit such as an isopropylidene diallylmalonate unit; a process for producing said homopolymer comprising the step of homopolymerising a monomer such as isopropylidene diallylmalonate; a copolymer containing said monomer unit and an ethylene unit and/or ?-olefin unit; and a process for producing said copolymer comprising the step of copolymerizing a monomer such as isopropylidene diallylmalonate with at least ethylene and/or an ?-olefin.
    Type: Application
    Filed: June 28, 2006
    Publication date: July 2, 2009
    Applicant: Sumitomo Chemical Company, Limited
    Inventors: Kohtaro Osakada, Daisuke Takeuchi, Sehoon Park, Masayuki Fujita, Wataru Hirahata
  • Patent number: 7005486
    Abstract: A catalyst for addition polymerization obtained by contacting (A) an organoaluminum compound, (B) a specific boron compound and (C) a solid inorganic compound, and a process for producing an addition polymer characterized by polymerizing an addition-polymerizable monomer in the presence of the catalyst.
    Type: Grant
    Filed: March 30, 2005
    Date of Patent: February 28, 2006
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Yoshinori Seki
  • Publication number: 20050187361
    Abstract: A catalyst for addition polymerization obtained by contacting (A) an organoaluminum compound, (B) a specific boron compound and (C) a solid inorganic compound, and a process for producing an addition polymer characterized by polymerizing an addition-polymerizable monomer in the presence of the catalyst.
    Type: Application
    Filed: March 30, 2005
    Publication date: August 25, 2005
    Applicant: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Yoshinori Seki
  • Patent number: 6894130
    Abstract: A catalyst for addition polymerization obtained by contacting (A) an organoaluminum compound, (B) a specific boron compound and (C) a solid inorganic compound, and a process for producing an addition polymer characterized by polymerizing an addition-polymerizable monomer in the presence of the catalyst.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: May 17, 2005
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Wataru Hirahata, Yoshinori Seki