Patents by Inventor Yoshikuni Okumura
Yoshikuni Okumura 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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Patent number: 9303101Abstract: The present invention relates to a method for producing a high-molecular-weight copolymer of polar group-containing allyl monomers comprising monomer units represented by formulae (3) and (4) (in the formulae, R1 represents a hydrogen atom (H) or hydrocarbon group having 1 to 6 carbon atoms; R2 represents —OH, —OCOR3 (R3 represents hydrocarbon group having 1 to 5 carbon atoms), —N(R4)2 (R4 represents a hydrogen atom or hydrocarbon group having 1 to 5 carbon atoms); and n and m are a value representing the molar ratio of each of the monomer units), which has few branches and unsaturated group at the molecular end, by copolymerizing olefin and an allyl compound using a metal complex of group 10 elements in the periodic system represented by formula (I) as a catalyst.Type: GrantFiled: April 30, 2013Date of Patent: April 5, 2016Assignees: THE UNIVERSITY OF TOKYO, SHOWA DENKO K.K.Inventors: Kyoko Nozaki, Brad Carrow, Yoshikuni Okumura, Junichi Kuroda
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Patent number: 9284390Abstract: The present invention relates to a method for producing a high-molecular-weight copolymer of polar group-containing allyl monomers including monomer units represented by formulae (3) and (4) (in the formulae, R1 represents a hydrogen atom (H) or hydrocarbon group having 1 to 6 carbon atoms; R2 represents —OH, —OCOR3 (R3 represents hydrocarbon group having 1 to 5 carbon atoms), —N(R4)2 (R4 represents a hydrogen atom or hydrocarbon group having 1 to 5 carbon atoms); and n and m are a value representing the molar ratio of each of the monomer units), which has few branches and unsaturated group at the molecular end, by copolymerizing olefin and an allyl compound using a metal complex of group 10 elements in the periodic system represented by formula (I) as a catalystType: GrantFiled: October 29, 2014Date of Patent: March 15, 2016Assignees: THE UNIVERSITY OF TOKYO, SHOWA DENKO K.K.Inventors: Kyoko Nozaki, Shingo Ito, Yoshikuni Okumura, Junichi Kuroda
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Publication number: 20150368376Abstract: The present invention relates to a method for producing a homopolymer of olefin represented by formula (1): CH2?CHR1 (R1 is a hydrogen atom or hydrocarbon group having 1 to 20 carbon atoms) or a copolymer of two or more thereof or a method for producing a copolymer of olefin represented by formula (1) with olefin containing a polar group represented by formula (2): CH2?CHR2R3 (R2 is a hydrogen atom or methyl group, R3 is —COOR12, —CN, —OCOR12, —OR12, —CH2—OCOR12, —CH2OH, —CH2—N(R13)2 or —CH2-Hal (R12, R13 and Hal have the same meanings as stated in the description), using as a catalyst a metal complex of group 10 elements in the periodic system typified by the structure represented by formula 1 (“Men” represents a menthyl group and “Me” represents a methyl group). The present invention enables the production of high molecular weight polymers of the polar group-containing monomers such as polar group-containing allyl compounds.Type: ApplicationFiled: January 22, 2014Publication date: December 24, 2015Applicants: SHOWA DENKO K.K., THE UNIVERSITY OF TOKYOInventors: Shingo ITO, Kyoko NOZAKI, Yusuke OTA, Yoshikuni OKUMURA, Junichi KURODA
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Patent number: 9051399Abstract: The present invention relates to a method of producing a polymer in the method for producing a copolymer of olefin and a polar group-containing monomer represented by formula (1): C(R1)2?C(R1)(C(R1)2)nR2??(1) (in the formula, the symbols have the same meanings as described in the description), the method comprising using a complex of a metal in Group 10 of the periodic table as a catalyst; and supplying a catalyst solution separated from a polymer after the polymerization reaction to a polymerization reaction system to recycle and re-use the catalyst. The production method of the present invention can dramatically reduce the catalyst cost.Type: GrantFiled: July 1, 2011Date of Patent: June 9, 2015Assignees: SHOWA DENKO K.K., THE UNIVERSITY OF TOKYOInventors: Yoshikuni Okumura, Daisuke Yagyu
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Publication number: 20150099857Abstract: The present invention relates to a method for producing a high-molecular-weight copolymer of polar group-containing allyl monomers comprising monomer units represented by formulae (3) and (4) (in the formulae, R1 represents a hydrogen atom (H) or hydrocarbon group having 1 to 6 carbon atoms; R2 represents —OH, —OCOR3 (R3 represents hydrocarbon group having 1 to 5 carbon atoms), —N(R4)2 (R4 represents a hydrogen atom or hydrocarbon group having 1 to 5 carbon atoms); and n and m are a value representing the molar ratio of each of the monomer units), which has few branches and unsaturated group at the molecular end, by copolymerizing olefin and an allyl compound using a metal complex of group 10 elements in the periodic system represented by formula (I) as a catalyst.Type: ApplicationFiled: April 30, 2013Publication date: April 9, 2015Applicants: SHOWA DENKO K.K., THE UNIVERSITY OF TOKYOInventors: Kyoko Nozaki, Brad Carrow, Yoshikuni Okumura, Junichi Kuroda
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Publication number: 20150051361Abstract: The present invention relates to a method for producing a high-molecular-weight copolymer of polar group-containing allyl monomers including monomer units represented by formulae (3) and (4) (in the formulae, R1 represents a hydrogen atom (H) or hydrocarbon group having 1 to 6 carbon atoms; R2 represents —OH, —OCOR3 (R3 represents hydrocarbon group having 1 to 5 carbon atoms), —N(R4)2 (R4 represents a hydrogen atom or hydrocarbon group having 1 to 5 carbon atoms); and n and m are a value representing the molar ratio of each of the monomer units), which has few branches and unsaturated group at the molecular end, by copolymerizing olefin and an allyl compound using a metal complex of group 10 elements in the periodic system represented by formula (I) as a catalystType: ApplicationFiled: October 29, 2014Publication date: February 19, 2015Applicants: SHOWA DENKO K.K., THE UNIVERSITY OF TOKYOInventors: Kyoko NOZAKI, Shingo ITO, Yoshikuni OKUMURA, Junichi KURODA
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Patent number: 8916663Abstract: The present invention relates to a method for producing a high-molecular-weight copolymer of polar group-containing allyl monomers including monomer units represented by formulae (3) and (4) (in the formulae, R1 represents a hydrogen atom (H) or hydrocarbon group having 1 to 6 carbon atoms; R2 represents —OH, —OCOR3 (R3 represents hydrocarbon group having 1 to 5 carbon atoms), —N(R4)2 (R4 represents a hydrogen atom or hydrocarbon group having 1 to 5 carbon atoms); and n and m are a value representing the molar ratio of each of the monomer units), which has few branches and unsaturated group at the molecular end, by copolymerizing olefin and a polar group-containing allyl compound using a metal complex of group 10 elements in the periodic system represented by formula (I) as a catalyst.Type: GrantFiled: August 26, 2010Date of Patent: December 23, 2014Assignees: The University of Tokyo, Showa Denko K.K.Inventors: Kyoko Nozaki, Shingo Ito, Yoshikuni Okumura, Junichi Kuroda
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Patent number: 8889805Abstract: The present invention provides a metal complex of group 10 elements of the periodic table having a carboxylate structure represented by formula (C2); a catalyst for polymerization of olefin mainly comprising the metal complex; and a method for producing polymers by homopolymerizing olefin represented by formula (1), polymerizing two or more kinds of the above olefin, or copolymerizing olefin represented by formula (1) with polar group-containing olefin represented by formula (2) (the meaning of the symbols are as set forth in the description) using the catalyst. A metal complex of group 10 elements of the periodic table, in which all of the coordinating atoms to the metal are a hetero atom is stable and useful as a catalyst component for olefin polymerization, and can be used for a long time in homopolymerization of olefin or copolymerization of two or more kinds of olefin.Type: GrantFiled: July 22, 2011Date of Patent: November 18, 2014Assignees: Showa Denko K.K., The University of TokyoInventors: Shingo Ito, Kyoko Nozaki, Yoshikuni Okumura, Junichi Kuroda
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Patent number: 8791307Abstract: A process of producing ?,?-unsaturated ethers includes pyrolyzing an acetal represented by Formula (2) below in a gas phase in the presence of a catalyst and a compound having at least one hydrogen atom capable of hydrogen bonding to produce an ?,?-unsaturated ether represented by Formula (3) below: R1R2CH—CR3(OR4)2??(2) R1R2C?C—R3(OR4)??(3) In Formulae (2) and (3), R1, R2 and R3 are each independently a hydrogen atom, an alkyl group, an alkenyl group or an aryl group; R4 is an alkyl group, an alkenyl group or an aryl group; the plurality of R4 in Formula (2) may be the same or different from each other.Type: GrantFiled: November 6, 2008Date of Patent: July 29, 2014Assignee: Showa Denko K.K.Inventors: Yoshikuni Okumura, Hiroto Kouka, Takanori Aoki
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Publication number: 20130165607Abstract: The present invention relates to a method of producing a polymer in the method for producing a copolymer of olefin and a polar group-containing monomer represented by formula (1): C(R1)2?C(R1)(C(R1)2)nR2??(1) (in the formula, the symbols have the same meanings as described in the description), the method comprising using a complex of a metal in Group 10 of the periodic table as a catalyst; and supplying a catalyst solution separated from a polymer after the polymerization reaction to a polymerization reaction system to recycle and re-use the catalyst. The production method of the present invention can dramatically reduce the catalyst cost.Type: ApplicationFiled: July 1, 2011Publication date: June 27, 2013Applicant: SHOWA DENKO K.K.Inventors: Yoshikuni Okumura, Daisuke Yagyu
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Publication number: 20130158223Abstract: The present invention provides a metal complex of group 10 elements of the periodic table having a carboxylate structure represented by formula (C2); a catalyst for polymerization of olefin mainly comprising the metal complex; and a method for producing polymers by homopolymerizing olefin represented by formula (1), polymerizing two or more kinds of the above olefin, or copolymerizing olefin represented by formula (1) with polar group-containing olefin represented by formula (2) (the meaning of the symbols are as set forth in the description) using the catalyst. A metal complex of group 10 elements of the periodic table, in which all of the coordinating atoms to the metal are a hetero atom is stable and useful as a catalyst component for olefin polymerization, and can be used for a long time in homopolymerization of olefin or copolymerization of two or more kinds of olefin.Type: ApplicationFiled: July 22, 2011Publication date: June 20, 2013Applicants: THE UNIVERSITY OF TOKYO, SHOWA DENKO K.K.Inventors: Shingo Ito, Kyoko Nozaki, Yoshikuni Okumura, Junichi Kuroda
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Publication number: 20120116036Abstract: The present invention relates to a method for producing a high-molecular-weight copolymer of polar group-containing allyl monomers including monomer units represented by formulae (3) and (4) (in the formulae, R1 represents a hydrogen atom (H) or hydrocarbon group having 1 to 6 carbon atoms; R2 represents —OH, —OCOR3 (R3 represents hydrocarbon group having 1 to 5 carbon atoms), —N(R4)2 (R4 represents a hydrogen atom or hydrocarbon group having 1 to 5 carbon atoms); and n and m are a value representing the molar ratio of each of the monomer units), which has few branches and unsaturated group at the molecular end, by copolymerizing olefin and an allyl compound using a metal complex of group 10 elements in the periodic system represented by formula (I) as a catalyst.Type: ApplicationFiled: August 26, 2010Publication date: May 10, 2012Applicants: SHOWA DENKO K.K., THE UNIVERSITY OF TOKYOInventors: Kyoko Nozaki, Shingo Ito, Yoshikuni Okumura, Junichi Kuro
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Patent number: 7842764Abstract: A bridged metallocene compound of formula (I) wherein: M is an atom of a transition metal; X, is a hydrogen atom, a halogen atom, or a hydrocarbon-based group; R1 is a C1-C40 hydrocarbon radical; R2 and R3, form together a condensed 3-7 membered ring; R4 is a hydrogen atom or a C1-C40 hydrocarbon radical; W is an aromatic 5 or 6 membered ring.Type: GrantFiled: March 15, 2006Date of Patent: November 30, 2010Assignee: Basell Poliolefine Italia s.r.l.Inventors: Ilya Nifant'ev, Pavel Ivchenko, Yoshikuni Okumura, Eleonora Ciaccia, Luigi Resconi
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Publication number: 20100261936Abstract: A process of producing ?,?-unsaturated ethers includes pyrolyzing an acetal represented by Formula (2) below in a gas phase in the presence of a catalyst and a compound having at least one hydrogen atom capable of hydrogen bonding to produce an ?,?-unsaturated ether represented by Formula (3) below: R1R2CH—CR3(OR4)2??(2) R1R2C?C—R3(OR4)??(3) In Formulae (2) and (3), R1, R2 and R3 are each independently a hydrogen atom, an alkyl group, an alkenyl group or an aryl group; R4 is an alkyl group, an alkenyl group or an aryl group; the plurality of R4 in Formula (2) may be the same or different from each other.Type: ApplicationFiled: November 6, 2008Publication date: October 14, 2010Applicant: SHOWA DENKO K.K.Inventors: Yoshikuni Okumura, Hiroto Kouka, Takanori Aoki
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Patent number: 7728181Abstract: Disclosed is a method for producing an ?,?-unsaturated ether efficiently and stably for a long time. In the method for producing an ?,?-unsaturated ether, an acetal is thermally decomposed in the presence of a catalyst containing an apatite represented by any of the following formula (1)-(4) (M)5?y(HZO4)y(ZO4)3?y(X)1?y??(1) (M)5?y(HPO4)y(PO4)3?y(X)1?y??(2) (M)5?y+2n(HZO4)y(ZO4)3?y(X)1?y(SiO4)n??(3) (M)5?y+m(HZO4)y(ZO4)3?y(X)1?y(CO3)m??(4).Type: GrantFiled: January 26, 2007Date of Patent: June 1, 2010Assignee: Showa Denko K.K.Inventors: Hiroto Kouka, Yoshikuni Okumura
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Publication number: 20090227818Abstract: Disclosed is a method for producing an ?,?-unsaturated ether efficiently and stably for a long time. In the method for producing an ?,?-unsaturated ether, an acetal is thermally decomposed in the presence of a catalyst containing an apatite represented by any of the following formulae (1)-(4).Type: ApplicationFiled: January 26, 2007Publication date: September 10, 2009Applicant: SHOWA DENKO K.K.Inventors: Hiroto Kouka, Yoshikuni Okumura
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Publication number: 20090062491Abstract: A bridged metallocene compound of formula (I) wherein: M is an atom of a transition metal; X, is a hydrogen atom, a halogen atom, or a hydrocarbon-based group; R1 is a C1-C40 hydrocarbon radical; R2 and R3, form together a condensed 3-7 membered ring; R4 is a hydrogen atom or a C1-C40 hydrocarbon radical; W is an aromatic 5 or 6 membered ring.Type: ApplicationFiled: March 15, 2006Publication date: March 5, 2009Inventors: Ilya E. Nifant'ev, Pavel V. Ivchenko, Yoshikuni Okumura, Eleonora Ciaccia, Luigi Resconi
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Patent number: 7452949Abstract: The present invention relates to organometallic transition metal compounds of the formula (I)Type: GrantFiled: December 6, 2004Date of Patent: November 18, 2008Assignee: Basell Polyolefine GmbHInventors: Yoshikuni Okumura, Ilya Nifant'ev, Michael J. Elder, Pavel V. Ivchenko, Vladimir V. Bagrov
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Patent number: 7405261Abstract: The present invention relates to compounds of the formula (I): where M1 is an element of group 3, 4, 5 or 6 of the Periodic Table, X are halogen, hydrogen, C1-C20-alkyl, C2-C20-alkenyl, C6-C22-aryl, alkylaryl or arylalkyl, n is a natural number from 1 to 4. R1 is hydrogen or a C1-C40 radical, R2 is a substituted or unsubstituted C6-C40-aryl radical or C2-C40-heteroaromatic radical containing at least one heteroatom, R3 is hydrogen or a C1-C40 radical, or the radicals R2 and R3 together form a ring system, R4 is hydrogen or a C1-C40 radical, R5 is a C1-C40 radical, and Z is a divalent group CR8R9—CR10R11, where R8, R9, R10 and R11 are hydrogen or a C1-C40 radical.Type: GrantFiled: December 2, 2003Date of Patent: July 29, 2008Assignee: Basell Polyolefine GmbHInventors: Jörg Schulte, Jörg Schottek, Yoshikuni Okumura
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Publication number: 20070155919Abstract: The present invention relates to organometallic transition metal compounds of the formula (I) where M1 is an element of group 3, 4, 5 or 6 of the Periodic Table of the Elements or the lanthanides, the radicals X are identical or different and are each an organic or inorganic radical, with two radicals X also being able to be joined to one another, n is a natural number from 1 to 4, Z is a divalent organic group which has from 1 to 40 carbon atoms and together with the two carbon atoms of the indenyl system forms a saturated or unsaturated, substituted or unsubstituted ring system having a ring size of from 4 to 12 atoms, where Z within the ring system fused to the indenyl system may also contain one or more, identical or different heteroatoms selected from the group consisting of Si, Ge, N, P, 0, S, Se and Te, R1 is hydrogen or an organic radical having from 1 to 40 carbon atoms, R2 is hydrogen or an organic radical having from 1 to 40 carbon atoms, R3 is hydrogen, halogen or an organic radical having from 1Type: ApplicationFiled: December 6, 2004Publication date: July 5, 2007Applicant: Basell Polyolefine GmbHInventors: Yoshikuni Okumura, Michael Elder, Ilya Nifant'ev, Pavel Ivchenko, Vladimir Bagrov