Patents by Inventor Masatoshi Nitabaru
Masatoshi Nitabaru 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: 7300903Abstract: The invention provides a process using olefin polymerization catalysts exhibiting excellent polymerization activities. The olefin polymerization catalysts of the invention contain a transition metal compound typified by formula (I) and at least one of an organometallic compound, an organoaluminum oxy-compound or a compound which reacts with said transition metal compound to form an ion pair.Type: GrantFiled: January 5, 2005Date of Patent: November 27, 2007Assignee: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Junji Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 6962890Abstract: An olefin polymerization catalyst having a high polymerization activity at high temperatures and a process for olefin polymerization using the catalyst are disclosed. The olefin polymerization catalyst comprises a transition metal compound which is represented by the following formula (I) and in which the net charge parameter of the central metal is not more than 2.00: wherein M is a transition metal atom of Group 4 to Group 5 of the periodic table, m is an integer of 1 to 5, Q is —N? or —C(R2)?, A is —O—, —S—, —Se— or —N(R5)—, R1 is an aliphatic hydrocarbon group or an alicyclic hydrocarbon group, R2 to R5 are each a hydrogen atom, a hydrocarbon group, an oxygen-containing group or the like, n is a number satisfying a valence of M, and X is a hydrogen atom, a halogen atom, a hydrocarbon group or the like.Type: GrantFiled: April 23, 2002Date of Patent: November 8, 2005Assignee: Mitsui Chemicals, Inc.Inventors: Naoto Matsukawa, Kazutaka Tsuru, Masatoshi Nitabaru, Junji Saito, Tetsuhiro Matsumoto
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Publication number: 20050124771Abstract: The invention provides a process using olefin polymerization catalysts exhibiting excellent polymerization activities. The olefin polymerization catalysts of the invention contain a transition metal compound of and at least one of an organometallic compound, an organoaluminum oxy-compound or a compound which reacts with said transition metal compound to form an ion pair. The process using the inventive catalysts is useful in producing ?-olefin/conjugated diene copolymers having specific properties.Type: ApplicationFiled: January 5, 2005Publication date: June 9, 2005Applicant: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Junji Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 6875718Abstract: The invention provides olefin polymerization catalysts exhibiting excellent polymerization activities, a process for olefin polymerization using the catalysts, a novel transition metal compound useful for the catalysts, and ?-olefin/conjugated diene copolymers having specific properties. The olefin polymerization catalysts of the invention contain (A) a transition metal compound of formula (I), and (B) an organometallic compound, an organoaluminum oxy-compound or an ionizing ionic compound. The novel transition metal compounds of the invention are compounds of formula (I) wherein M is a transition metal atom of Group 3 or 4 of the periodic table; R1 is a hydrocarbon group, etc.; R2 to R5 are each H, a halogen, a hydrocarbon group, etc.; R6 is a halogen, a hydrocarbon group, etc.Type: GrantFiled: August 31, 2001Date of Patent: April 5, 2005Assignee: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Junji Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 6770723Abstract: The invention provides olefin polymerization catalyst exhibiting excellent polymerization activities, a process for olefin polymerization using the catalyst, a novel transition metal compound useful for the catalyst, and an &agr;-olefin/conjugated diene copolymer having specific properties. The olefin polymerization catalyst of the invention comprises (A) a transition metal compound of formula (I) or (II), and (B) an organometallic compound, an oranoaluminum oxy-compound or an ionizing ionic compound. The novel transition metal compound of the invention is a compound of formula (I) wherein M is a transition meal atom of Group 3 or 4 of the periodic table; m is an integer of 1 to 3; R1 is a hydrocarbon group, etc.; R2 to R5 are each H, a halogen, a hydrocarbon group, etc.; R6 is a halogen, a hydrocarbon group, etc.; n is a number satisfying a valence of M; and X is a halogen, a hydrocarbon group, etc.Type: GrantFiled: August 31, 2001Date of Patent: August 3, 2004Assignee: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Junji Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 6593266Abstract: An olefin polymerization catalyst having an excellent polymerization activity and an olefin polymerization process using the catalyst are disclosed. The olefin polymerization catalyst comprises (A) a transition metal compound represented by, for example, the following formula (I) and optionally (B) at least one compound selected from an organometallic compound, an organoaluminum oxy-compound and a compound which reacts with the transition metal compound (A) to from an ion pair; wherein M is a transition metal atom of Group 3 to Group 11 of the periodic table; m is an integer of 1 to 6; A is —O—, —S—, —Se— or —N(R5)—; D is —C(R7)(R8)—, —Si(R9)(R10)— or the like; Z is —R13 and —R14, ═C(R15)R16, ═NR17 or the like; R1 to R17 are each H, a hydrocarbon group or the like; n is a number satisfying a valence of M; and X is halogen, a hydrocarbon group or the like.Type: GrantFiled: April 15, 1999Date of Patent: July 15, 2003Assignee: Mitsui Chemicals, Inc.Inventors: Shigekazu Matsui, Kazutaka Tsuru, Masatoshi Nitabaru, Terunori Fujita, Makoto Mitani, Yukihiro Takagi, Takashi Nakano
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Publication number: 20030004290Abstract: An olefin polymerization catalyst having a high polymerization activity at high temperatures and a process for olefin polymerization using the catalyst are disclosed. The olefin polymerization catalyst comprises a transition metal compound which is represented by the following formula (I) and in which the net charge parameter of the central metal is not more than 2.00.Type: ApplicationFiled: April 23, 2002Publication date: January 2, 2003Applicant: Mitsui Chemicals, Inc.Inventors: Naoto Matsukawa, Kazutaka Tsuru, Masatoshi Nitabaru, Junji Saito, Tetsuhiro Matsumoto
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Patent number: 6451728Abstract: The present invention provides an olefin polymerization catalyst by the use of which an olefin (co)polymer can be obtained with a high polymerization activity, and also provides a process for olefin polymerization using the catalyst. The olefin polymerization catalyst comprises a transition metal compound (A) represented by the formula (I): M: atom of Group 3 to Group 11 U: R2—C, N, P A: N, P Q: R3—C, N, P S: R4—C, N, P T: R5—C, N, P m: 2-6 R1-R5: hydrogen, hydrocarbon group, silicon-containing group or the like (When M is an atom of Group 6, R1 is not an aromatic hydrocarbon group.) n: number satisfying a valence of M X: halogen, hydrocarbon group or the like.Type: GrantFiled: December 10, 1999Date of Patent: September 17, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Shigekazu Matsui, Masatoshi Nitabaru, Yasunori Yoshida, Makoto Mitani, Terunori Fujita
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Publication number: 20020115557Abstract: The invention provides olefin polymerization catalyst exhibiting excellent polymerization activities, a process for olefin polymerization using the catalyst, a novel transition metal compound useful for the catalyst, and an &agr;-olefin/conjugated diene copolymer having specific properties. The olefin polymerization catalyst of the invention comprises (A) a transition metal compound of formula (I) or (II), and (B) an organometallic compound, an oranoaluminum oxy-compound or an ionizing ionic compound. The novel transition metal compound of the invention is a compound of formula (I) wherein M is a transition meal atom of Group 3 or 4 of the periodic table; m is an integer of 1 to 3; R1 is a hydrocarbon group, etc.; R2 to R5 are each H, a halogen, a hydrocarbon group, etc.; R6 is a halogen, a hydrocarbon group, etc.; n is a number satisfying a valence of M; and X is a halogen, a hydrocarbon group, etc.Type: ApplicationFiled: August 31, 2001Publication date: August 22, 2002Applicant: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Junji Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 6399724Abstract: The present invention is intended to provide an olefin polymerization catalyst comprising a novel transition metal compound and having an excellent olefin polymerization activity and to provide a process for olefin polymerization.Type: GrantFiled: December 3, 1999Date of Patent: June 4, 2002Assignee: Mitsui Chemicals, Inc.Inventors: Shigekazu Matsui, Masatoshi Nitabaru, Kazutaka Tsuru, Terunori Fujita, Yasuhiko Suzuki, Yukihiro Takagi, Hidetsugu Tanaka
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Publication number: 20020055600Abstract: The invention provides olefin polymerization catalyst exhibiting excellent polymerization activities, a process for olefin polymerization using the catalyst, a novel transition metal compound useful for the catalyst, and an &agr;-olefin/conjugated diene copolymer having specific properties. The olefin polymerization catalyst of the invention comprises (A) a transition metal compound of formula (I) or (II), and (B) an organometallic compound, an oranoaluminum oxy-compound or an ionizing ionic compound. The novel transition metal compound of the invention is a compound of formula (I) wherein M is a transition meal atom of Group 3 or 4 of the periodic table; m is an integer of 1 to 3; R1 is a hydrocarbon group, etc.; R2 to R5 are each H, a halogen, a hydrocarbon group, etc.; R6 is a halogen, a hydrocarbon group, etc.; n is a number satisfying a valence of M; and X is a halogen, a hydrocarbon group, etc.Type: ApplicationFiled: August 31, 2001Publication date: May 9, 2002Applicant: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Jungi Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 6309997Abstract: The invention provides olefin polymerization catalyst exhibiting excellent polymerization activities, a process for olefin polymerization using the catalyst, a novel transition metal compound useful for the catalyst, and an &agr;-olefin/conjugated diene copolymer having specific properties. The olefin polymerization catalyst of the invention comprises (A) a transition metal compound of formula (I) or (II), and (B) an organometallic compound, an oranoaluminum oxy-compound or an ionizing ionic compound. The novel transition metal compound of the invention is a compound of formula (I) wherein M is a transition meal atom of Group 3 or 4 of the periodic table; m is an integer of 1 to 3; R1 is a hydrocarbon group, etc.; R2 to R5 are each H, a halogen, a hydrocarbon group, etc.; R6 is a halogen, a hydrocarbon group, etc.; n is a number satisfying a valence of M; and X is a halogen, a hydrocarbon group, etc.Type: GrantFiled: April 24, 1998Date of Patent: October 30, 2001Assignee: Mitsui Chemicals, Inc.Inventors: Terunori Fujita, Yasushi Tohi, Makoto Mitani, Shigekazu Matsui, Junji Saito, Masatoshi Nitabaru, Kiyoaki Sugi, Haruyuki Makio, Toshiyuki Tsutsui
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Patent number: 5723640Abstract: The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms, R.sup.2 is an aryl group of 6 to 16 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom or the like; and Y is a divalent hydrocarbon group, a divalent silicon-containing group or the like. An olefin polymerization catalyst component of the present invention comprises the aforementioned transition metal compound.Type: GrantFiled: March 26, 1996Date of Patent: March 3, 1998Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Daisuke Fukuoka, Takashi Tashiro, Koji Kawaai, Junji Saito, Takashi Ueda, Yoshihisa Kiso, Junichi Imuta, Terunori Fujita, Masatoshi Nitabaru, Masayasu Yoshida
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Patent number: 5710223Abstract: A process for polymerizing propylene utilizes a metallocene catalyst component of the formula (I) ##STR1## wherein M is a transition metal, R.sup.1 is a C.sub.2-6 hydrocarbon, R.sup.2 is a C.sub.6-16 aryl group, X.sup.1 and X.sup.2 are each a halogen atom and Y is a divalent hydrocarbon or a divalent silicon-containing group. Propylene polymers produced thereby have such properties that the triad tacticity of propylene units is high, the proportion of inversely inserted units based on the 2,1-insertion of propylene monomer is in a specific range and the intrinsic viscosity (.eta.), as measured in decahydronaphthalene at 135.degree. C., is in a specific range.Type: GrantFiled: September 25, 1996Date of Patent: January 20, 1998Assignee: Mitsui Petrochemical Industries Ltd.Inventors: Daisuke Fukuoka, Takashi Tashiro, Koji Kawaai, Junji Saito, Takashi Ueda, Yoshihisa Kiso, Junichi Imuta, Terunori Fujita, Masatoshi Nitabaru, Masayasu Yoshida
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Patent number: 5658997Abstract: The novel transition metal compound of the invention is represented by the following formula (I): ##STR1## wherein M is a transition metal; R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms, R.sup.2 is an aryl group of 6 to 16 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom or the like; and Y is a divalent hydrocarbon group, a divalent silicon-containing group or the like. An olefin polymerization catalyst component of the present invention comprises the aforementioned transition metal compound. An olefin polymerization catalyst of the present invention comprises the aforementioned olefin polymerization catalyst component. The propylene homopolymer, the propylene copolymer and the propylene elastomer according to the present invention have such properties that the triad tacticity of propylene units chain is high, a proportion of the inversely units based on the 2,1-insertion of propylene monomer is in the specific range, and the intrinsic viscosity [.eta.Type: GrantFiled: June 7, 1995Date of Patent: August 19, 1997Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Daisuke Fukuoka, Takashi Tashiro, Koji Kawaai, Junji Saito, Takashi Ueda, Yoshihisa Kiso, Junichi Imuta, Terunori Fujita, Masatoshi Nitabaru, Masayasu Yoshida
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Patent number: 5629254Abstract: The novel transition metal catalyst of the invention is represented by the following formula (I): ##STR1## wherein M is a zirconium or hafnium; R.sup.1 is a hydrocarbon group of 2 to 6 carbon atoms, R.sup.2 is an aryl group of 6 to 16 carbon atoms; X.sup.1 and X.sup.2 are each a halogen atom; and Y is a divalent hydrocarbon group, a divalent silicon-containing group.Type: GrantFiled: June 7, 1995Date of Patent: May 13, 1997Assignee: Mitsui Petrochemical Industries Co., Ltd.Inventors: Daisuke Fukuoka, Takashi Tashiro, Koji Kawaai, Junji Saito, Takashi Ueda, Yoshihisa Kiso, Junichi Imuta, Terunori Fujita, Masatoshi Nitabaru, Masayasu Yoshida
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Patent number: 5360921Abstract: Disclosed is a process for preparing a cyclopentadienyl group-containing silicon compound or a cyclopentadienyl group-containing germanium compound, comprising reacting (i) a lithium, sodium or potassium salt of a cyclopentadiene derivative with (ii) a silicon halide compound or a germanium halide compound in the presence of a cyanide or a thiocyanate. The cyanide or the thiocyanate is preferably a copper salt. According to the process of the invention, a cyclopentadienyl group-containing silicon compound or a cyclopentadienyl group-containing germanium compound, which is very useful for the preparation of a metallocene complex catalyst component, can be prepared in a high yield for a short period of time.Type: GrantFiled: March 11, 1994Date of Patent: November 1, 1994Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Yoshihisa Kiso, Koji Kawaai, Masatoshi Nitabaru
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Patent number: 5210065Abstract: A color-forming recording material containing:(a) an aromatic diamine,(b) an oxidizing agent such as a quinoid type electron-accepting compound, and(c) an acidic substance such as an aromatic carboxylic acid.Type: GrantFiled: October 2, 1991Date of Patent: May 11, 1993Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Michio Tanaka, Koji Kawai, Hiroyoshi Tarumoto, Hisaya Miki, Keiki Kishikawa, Masato Kawamura, Masatoshi Nitabaru, Terunori Fujita
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Patent number: 4835325Abstract: Hydroxybenzenes can be produced in high yield through a one-step reaction by subjecting (a) an .alpha.,.alpha.-dialkyl-.alpha.-hydroxymethyl group containing benzene and/or (b) a benzene containing both .alpha.,.alpha.-dialkyl-.alpha.-hydroxymethyl and .alpha.,.alpha.-dialkyl-.alpha.-hydroperoxymethyl groups to reaction in the presence of a nitrile, an acid and hydrogen peroxide. In a preferred mode, the reaction system further contains (c) an .alpha.,.alpha.-dialkyl-.alpha.-hydroperoxymethyl group containing benzene.Type: GrantFiled: March 25, 1988Date of Patent: May 30, 1989Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Hisaya Miki, Shintarou Araki, Masatoshi Nitabaru
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Patent number: 4783557Abstract: Disclosed in accordance with the present invention are processes for the preparation of hydroperoxides and/or carbinols by liquid phase oxidation of secondary alkyl-substituted naphthalenes with molecular oxygen, wherein the oxidation reaction is carried out by dissolving in the reaction mixture containing the secondary alkyl-substituted naphthalenes at least 0.5 ppm in terms of metal, based on the starting secondary alkyl-substituted naphthalenes, of at least one compound of metal selected from the group consisting of palladium and gold, said metal compound being soluble in the reaction mixture of the secondary alkyl-substituted naphthalenes.Type: GrantFiled: September 10, 1987Date of Patent: November 8, 1988Assignee: Mitsui Petrochemical Industries, Ltd.Inventors: Yutaka Haneda, Sadao Yoshimoto, Hisaya Miki, Masaaki Yasuda, Shintarou Araki, Masatoshi Nitabaru