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).
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Publication number: 20140206829Abstract: 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: ApplicationFiled: March 21, 2014Publication date: July 24, 2014Applicant: Cornell UniversityInventors: Geoffrey W. Coates, Wataru Hirahata
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Patent number: 8710283Abstract: 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: GrantFiled: September 21, 2012Date of Patent: April 29, 2014Assignee: Cornell UniversityInventors: Geoffrey W. Coates, Wataru Hirahata
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Patent number: 8288488Abstract: 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: GrantFiled: April 26, 2011Date of Patent: October 16, 2012Assignee: Sumitomo Chemical Company, LimitedInventors: Yasuki Fujiwara, Wataru Hirahata, Hirofumi Hamaki
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Patent number: 8247510Abstract: 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: GrantFiled: July 15, 2011Date of Patent: August 21, 2012Assignee: Sumitomo Chemical Company, LimitedInventors: Kohtaro Osakada, Daisuke Takeuchi, Sehoon Park, Masayuki Fujita, Wataru Hirahata
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Patent number: 8236908Abstract: 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: GrantFiled: April 5, 2011Date of Patent: August 7, 2012Assignee: Sumitomo Chemical Company, LimitedInventors: Wataru Hirahata, Hidenori Hanaoka, Masaya Tanimoto
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Patent number: 8105970Abstract: 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: GrantFiled: March 22, 2011Date of Patent: January 31, 2012Assignee: Sumitomo Chemical Company, LimitedInventors: Mitsuhiro Okada, Wataru Hirahata
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Publication number: 20110288250Abstract: 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: ApplicationFiled: July 15, 2011Publication date: November 24, 2011Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Kohtaro OSAKADA, Daisuke TAKEUCHI, Sehoon PARK, Masayuki FUJITA, Wataru HIRAHATA
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Publication number: 20110269929Abstract: 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: ApplicationFiled: April 26, 2011Publication date: November 3, 2011Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yasuki FUJIWARA, Wataru HIRAHATA, Hirofumi HAMAKI
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Publication number: 20110269928Abstract: 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: ApplicationFiled: April 26, 2011Publication date: November 3, 2011Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yasuki FUJIWARA, Wataru HIRAHATA
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Publication number: 20110269927Abstract: 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: ApplicationFiled: April 5, 2011Publication date: November 3, 2011Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Wataru HIRAHATA, Hidenori HANAOKA, Masaya TANIMOTO
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Patent number: 8044159Abstract: 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: GrantFiled: June 28, 2006Date of Patent: October 25, 2011Assignee: Sumitomo Chemical Company, LimitedInventors: Kohtaro Osakada, Daisuke Takeuchi, Sehoon Park, Masayuki Fujita, Wataru Hirahata
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Publication number: 20110245439Abstract: 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: ApplicationFiled: March 22, 2011Publication date: October 6, 2011Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Mitsuhiro OKADA, Wataru HIRAHATA
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Patent number: 7939460Abstract: 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: GrantFiled: October 9, 2009Date of Patent: May 10, 2011Assignee: Sumitomo Chemical Company, LimitedInventors: Wataru Hirahata, Shinya Nakahara
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Publication number: 20100174038Abstract: 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: ApplicationFiled: December 11, 2009Publication date: July 8, 2010Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Wataru HIRAHATA, Shinya NAKAHARA
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Publication number: 20100144969Abstract: 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: ApplicationFiled: February 16, 2010Publication date: June 10, 2010Applicant: CORNELL UNIVERSITYInventors: Geoffrey W. Coates, Wataru Hirahata
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Publication number: 20100125125Abstract: 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: ApplicationFiled: October 9, 2009Publication date: May 20, 2010Applicant: Sumitomo Chemical Company, LimitedInventors: Wataru HIRAHATA, Shinya NAKAHARA
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Publication number: 20090171054Abstract: 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: ApplicationFiled: June 28, 2006Publication date: July 2, 2009Applicant: Sumitomo Chemical Company, LimitedInventors: Kohtaro Osakada, Daisuke Takeuchi, Sehoon Park, Masayuki Fujita, Wataru Hirahata
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Patent number: 7005486Abstract: 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: GrantFiled: March 30, 2005Date of Patent: February 28, 2006Assignee: Sumitomo Chemical Company, LimitedInventors: Wataru Hirahata, Yoshinori Seki
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Publication number: 20050187361Abstract: 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: ApplicationFiled: March 30, 2005Publication date: August 25, 2005Applicant: Sumitomo Chemical Company, LimitedInventors: Wataru Hirahata, Yoshinori Seki
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Patent number: 6894130Abstract: 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: GrantFiled: December 22, 2000Date of Patent: May 17, 2005Assignee: Sumitomo Chemical Company, LimitedInventors: Wataru Hirahata, Yoshinori Seki