Patents by Inventor Tetsuhiro Matsumoto
Tetsuhiro Matsumoto 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: 8629075Abstract: The present invention provides a process for producing an ?-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher ?-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.Type: GrantFiled: August 6, 2010Date of Patent: January 14, 2014Assignee: Mitsui Chemicals, Inc.Inventors: Tetsuhiro Matsumoto, Toshiyuki Tsutsui, Kisu Ro, Kourei Kuroiwa, Takushi Nagata, Atsushi Shibahara, Tatsuya Nakamura, Tetsunori Shinozaki
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Patent number: 7875350Abstract: Ethylene polymer particles having an intrinsic viscosity [?] of 5 dl/g to 30 dl/g, a degree of crystallinity of as high as 80% or more, and a specific shape on the surface of the particles. The ethylene polymer particles can be obtained by carrying out polymerization of olefins including ethylene using an olefin polymerization catalyst containing a solid titanium catalyst component including magnesium, halogen and titanium under specific conditions. The ethylene polymer particles obtained by a solid phase method, such as solid phase drawing molding, are capable of providing a molded article with high strength.Type: GrantFiled: July 25, 2007Date of Patent: January 25, 2011Assignee: Mitsui Chemicals, Inc.Inventors: Tetsuhiro Matsumoto, Tetsunori Shinozaki, Yasushi Nakayama, Kunihiko Mizumoto, Satoshi Akiyama, Toshiyuki Tsutsui
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Publication number: 20100324239Abstract: The present invention provides a process for producing an ?-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher ?-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.Type: ApplicationFiled: August 6, 2010Publication date: December 23, 2010Applicant: Mitsui Chemicals, Inc.Inventors: Tetsuhiro Matsumoto, Toshiyuki Tsutsui, Kisu Ro, Kourei Kuroiwa, Takushi Nagata, Atsushi Shibahara, Tatsuya Nakamura, Tetsunori Shinozaki
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Publication number: 20100196711Abstract: [Subject] The present invention provides ultra-high molecular weight polyolefin fine particles having a small particle diameter and a narrow particle size distribution, a molded article made of the fine particles and a sintered filter obtainable by sintering molding the ultra-high molecular weight polyolefin fine particles. [Means for Solving the Subject] The ultra-high molecular weight polyolefin fine particles comprising 1 to 50 ppm of a titanium atom and 1 to 1000 ppm of an aluminum atom, wherein the ultra-high molecular weight polyolefin fine particles have: [A] an intrinsic viscosity, as measured in decalin at 135° C., of not less than 5 dl/g, [B] an average particle diameter of not more than 20 ?m, and [C] a content of particles having a particle diameter of 0 to 40 ?m of not less than 90% by mass.Type: ApplicationFiled: July 4, 2008Publication date: August 5, 2010Inventors: Kazuaki Yasuda, Tetsuhiro Matsumoto, Kunihiko Mizumoto
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Patent number: 7687579Abstract: An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9?7.15×SR; and the intrinsic viscosity ([?]) and the melt flow rate (MFR) satisfy the relation; [?]>1.85×MFR?0.192 in the case of MFR<1 and the relation; [?]>1.85×MFR?0.213 in the case of MFR?1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.Type: GrantFiled: August 26, 2005Date of Patent: March 30, 2010Assignee: Mitsui Chemicals, Inc.Inventors: Mamoru Takahashi, Tetsuji Kasai, Junji Saito, Naoto Matsukawa, Kazutaka Tsuru, Makoto Mitani, Terunori Fujita, Shiro Otsuzuki, Tetsuhiro Matsumoto, Toshiyuki Tsutsui
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Patent number: 7563849Abstract: An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9?7.15×SR; and the intrinsic viscosity ([?]) and the melt flow rate (MFR) satisfy the relation; [?]>1.85×MFR?0.192 in the case of MFR<1 and the relation; [?]>1.85×MFR?0.213 in the case of MFR?1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.Type: GrantFiled: August 26, 2005Date of Patent: July 21, 2009Assignee: Mitsui Chemicals, Inc.Inventors: Mamoru Takahashi, Tetsuji Kasai, Junji Saito, Naoto Matsukawa, Kazutaka Tsuru, Makoto Mitani, Terunori Fujita, Shiro Otsuzuki, Tetsuhiro Matsumoto, Toshiyuki Tsutsui
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Publication number: 20080090081Abstract: The present invention provides ethylene polymer particles obtained by a solid phase method such as solid phase drawing molding and capable of providing a molded article with high strength. The ethylene polymer particles have an intrinsic viscosity [?] of 5 dl/g to 30 dl/g, a degree of crystallinity of as high as 80% or more, and a specific shape on the surface of the particles. The ethylene polymer particles can be obtained, for example, by carrying out polymerization of olefins including ethylene using an olefin polymerization catalyst containing a solid titanium catalyst component including magnesium, halogen and titanium under specific conditions.Type: ApplicationFiled: July 25, 2007Publication date: April 17, 2008Applicant: Mitsui Chemicals, Inc.Inventors: Tetsuhiro Matsumoto, Tetsunori Shinozaki, Yasushi Nakayama, Kunihiko Mizumoto, Satoshi Akiyama, Toshiyuki Tsutsui
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Patent number: 7335716Abstract: An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9?7.15×SR; and the intrinsic viscosity ([?]) and the melt flow rate (MFR) satisfy the relation; [?]>1.85×MFR?0.192 in the case of MFR?1 and the relation; [?]>1.85×MFR?0.213 in the case of MFR?1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.Type: GrantFiled: June 16, 2000Date of Patent: February 26, 2008Assignee: Mitsui Chemicals, Inc.Inventors: Mamoru Takahashi, Tetsuji Kasai, Junji Saito, Naoto Matsukawa, Kazutaka Tsuru, Makoto Mitani, Terunori Fujita, Shiro Otsuzuki, Tetsuhiro Matsumoto, Toshiyuki Tsutsui
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Publication number: 20080004412Abstract: The present invention provides a process for producing an ?-olefin polymer comprising polymerizing or copolymerizing (a) C3 or higher ?-olefin(s) in the presence of an olefin polymerization catalyst comprising solid titanium catalyst component (I) containing titanium, magnesium, halogen, and a compound with a specific structure having two or more ether linkages and organometallic catalyst component (II) with high catalytic activity. In this process, particularly even in (co)polymerizing (a) higher olefin(s), demineralization is unnecessary. A 4-methyl-1-pentene-based polymer obtained by polymerization using the catalyst of the present invention is excellent in tacticity, transparency, heat resistance, and releasability, and the polymer is particularly suitable for a release film.Type: ApplicationFiled: November 16, 2005Publication date: January 3, 2008Inventors: Tetsuhiro Matsumoto, Toshiyuki Tsutsui, Kisu Ro, Kourei Kuroiwa, Takushi Nagata, Atsushi Shibahara, Tatsuya Nakamura, Tooru Tanaka, Tetsunori Shinozaki
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Publication number: 20060047096Abstract: An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9?7.15×SR; and the intrinsic viscosity ([?]) and the melt flow rate (MFR) satisfy the relation; [?]>1.85×MFR?0.192 in the case of MFR<1 and the relation; [?]>1.85×MFR?0.213 in the case of MFR?1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.Type: ApplicationFiled: August 26, 2005Publication date: March 2, 2006Inventors: Mamoru Takahashi, Tetsuji Kasai, Junji Saito, Naoto Matsukawa, Kazutaka Tsuru, Makoto Mitani, Terunori Fujita, Shiro Otsuzuki, Tetsuhiro Matsumoto, Toshiyuki Tsutsui
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Publication number: 20060047079Abstract: An ethylene (co)polymer of the present invention is a (co)polymer with excellent moldability and mechanical properties and either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 4 to 20 carbon atoms. The (co)polymer has methyl branches measured by 13C-NMR less than 0.1 in number per 1,000 carbon atoms and Mw/Mn measured by GPC not lower than 1.8 and lower than 4.5. The (co)polymer is either an ethylene homopolymer or a copolymer of ethylene and an ?-olefin of 3 to 20 carbon atoms. The melt tension (MT) and the swell ratio (SR) satisfy the relation; log(MT)>12.9?7.15×SR; and the intrinsic viscosity ([?]) and the melt flow rate (MFR) satisfy the relation; [?]>1.85×MFR?0.192 in the case of MFR<1 and the relation; [?]>1.85×MFR?0.213 in the case of MFR?1. Such an ethylene (co)polymer can be usable for various molding applications and especially suitable for pipes.Type: ApplicationFiled: August 26, 2005Publication date: March 2, 2006Inventors: Mamoru Takahashi, Tetsuji Kasai, Junji Saito, Naoto Matsukawa, Kazutaka Tsuru, Makoto Mitani, Terunori Fujita, Shiro Otsuzuki, Tetsuhiro Matsumoto, 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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Patent number: 6583237Abstract: An olefin polymer production method is provided by which olefin polymers can be obtained at high polymerization activity under the conditions of reduced hydrogen concentration. Silyl-terminated olefin polymers may be obtained by this method. The olefin is polymerized using a catalyst of a transition metal compound (A) of Groups 3 to 10 of the periodic table, at least one compound (B) selected from organoaluminum oxycompounds (B-1), compounds (B-2) that react with the abovementioned compound (A) to form an ion pair, and organoaluminum compounds (B-3), under the coexistence of an organosilicon compound (C) or dialkylzinc compound (D) and in the presence or absence of hydrogen (E).Type: GrantFiled: September 7, 2000Date of Patent: June 24, 2003Assignee: Mitsui Chemicals, Inc.Inventors: Jun-ichi Imuta, Tetsuhiro Matsumoto
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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: 6300416Abstract: A rubber composition useful as a tire side wall or tire tread is formed from an unsaturated olefin copolymer (A) or (A′) and diene rubber (B). Copolymers (A) and (A′) are each obtained from (i) ethylene, (ii) aromatic vinyl compound, (iii) non-conjugated polyene, and, optionally (iv) alpha-olefin having at least 3 carbon atoms. When used in forming a tire side wall, copolymer (A) has a molar ratio of (i)/(iv) from 100/0 to 40/60; molar ratio of [((i)+(iv))/(ii)] from 98/2 to 60/40; an intrinsic viscosity, measured in decalin, at 135° C., from 1.0 to 6.0 dl/g; and iodine value from 10 to 50. For use in tire tread, copolymer (A′), has a molar ratio (i)/(iv) from 100/0 to 40/60; molar ratio [((i)+(iv)):(ii)] from 99/1 to 85/15. The weight ratio (A′)/(B) is from 1/99 to 50/50. The compositions for tire side wall are characterized by excellent strength properties and bending fatigue resistance and low fuel consumption.Type: GrantFiled: September 17, 1998Date of Patent: October 9, 2001Assignee: Mitsui Chemicals, Inc.Inventors: Keiji Okada, Kenichi Morizono, Kazuyuki Takimoto, Tetsuhiro Matsumoto, Masaaki Kawasaki, Tetsuo Tojo
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Patent number: 6197985Abstract: A low-bulk density solid aluminoxane has an average particle diameter of 210 to 10,000 &mgr;m and a bulk density of from 0.01 to 1.0 g/cc. Representative solid aluminoxanes may be prepared from polymethylaluminoxane or mixed alkyl group aluminoxanes. The solid aluminoxanes are useful as catalyst carriers. When used to support a metallocene, the combination may be used, for example, as catalyst for olefin polymerization Also disclosed is a prepolymerized catalyst having an average particle diameter of from 500 to 5,000 &mgr;m, useful for olefin polymerization. An olefin is pre-polymerized in the presence of a metallocene catalyst component and a solid low bulk-density aluminoxane and, optionally, an organoaluminum compound.Type: GrantFiled: September 1, 1998Date of Patent: March 6, 2001Assignee: Mitsui Chemicals INCInventors: Atsuo Kobata, Kazuhito Gotoh, Shigeru Isayama, Tetsuhiro Matsumoto
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Patent number: 6060416Abstract: A high-performance prepolymerized solid catalyst is prepared by polymerizing an olefin onto an olefin polymerization catalyst in a heterogeneous system under irradiation with an elastic wave, wherein the olefin is prepolymerized in an amount of not less than 0.1 g based on 1 mmol of a transition metal contained in the olefin polymerization catalyst. The elastic wave is preferably an ultrasonic wave. In a process for heterogeneous polymerization of an olefin, an olefin is subjected to slurry polymerization or gas phase polymerization in the presence of the prepolymerized solid catalyst. In a process for heterogeneous polymerization of an olefin, an olefin may be polymerized onto the olefin polymerization catalyst in a heterogeneous system under irradiation with an elastic wave to prepare polyolefin. Therefore, the heterogeneous polymerization of an olefin can be stably conducted and polyolefins of uniform property and high quality can be obtained.Type: GrantFiled: November 20, 1998Date of Patent: May 9, 2000Assignee: Mitsui ChemicalsInventors: Atsuo Kobata, Tetsuhiro Matsumoto
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Patent number: 6043325Abstract: A process for olefin polymerization, including polymerizing or copolymerizing an olefin in the presence of an olefin polymerization catalyst composed of: a fine particle carrier; (A) a transition metal compound of a Group IVB metal of the periodic table, containing a ligand having a cyclopentadienyl skeleton; (B) an aluminoxane compound; and optionally (C) an organoaluminum compound, wherein said aluminoxane compound has an alkyl groups to aluminum ratio of 1.3 to 2.1; said transition metal compound (A) and said organoaluminum oxy-compound (B) and said organoaluminum compound being supported on the fine particle carrier; and said solid catalyst having a bulk density of 0.3 g/cm.sup.3 to 0.5 g/cm.sup.3 and a fluidity index of 45 to 70 and an olefin polymerization process using the olefin polymerization catalyst; and an olefin prepolymerized catalyst obtained by prepolymerizing the catalyst, and an olefin polymerization process using the olefin prepolymerized catalyst.Type: GrantFiled: November 26, 1997Date of Patent: March 28, 2000Assignee: Mitsui Chemicals, Inc.Inventors: Toshiyuki Tsutsui, Ken Yoshitsugu, Masaaki Ohgizawa, Tetsuhiro Matsumoto, Junichi Imuta
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Patent number: 5986008Abstract: The present invention is to provide a propylene polymer composition capable of producing heat molded products having excellent balance between rigidity and impact resistance and to provide heat molded products produced from the composition, such as films and pipes. The propylene polymer composition comprises 10 to 90% by weight of a propylene polymer (A) and 90 to 10% by weight of a propylene polymer (B). The propylene polymer (A) has MFR.sub.A (measured at 230.degree. C. under a load of 2.16 kg) of 0.001 to 8 g/10 min, Tm (measured by a differential scanning calorimeter) of 95 to 145.degree. C. and a density (d.sub.A) of 885 to 905 kg/M.sup.3, and in this polymer, the content of constituent units derived from an .alpha.-olefin of 4 to 20 carbon atoms is in the range of 1.5 to 11% by mol. The propylene polymer (B) has MFR.sub.B (measured at 230.degree. C. under a load of 2.16 kg) of 0.1 to 600 g/10 min, Tm (measured by a differential scanning calorimeter) of 145 to 170.degree. C., a density (d.sub.Type: GrantFiled: September 1, 1998Date of Patent: November 16, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Shinya Matsunaga, Akira Todo, Satoru Moriya, Akio Ishimoto, Tetsuhiro Matsumoto
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Patent number: 5939345Abstract: A high-performance prepolymerized solid catalyst is prepared by polymerizing an olefin onto an olefin polymerization catalyst in a heterogeneous system under irradiation with an elastic wave, wherein the olefin is prepolymerized in an amount of not less than 0.1 g based on 1 mmol of a transition metal contained in the olefin polymerization catalyst. The elastic wave is preferably an ultrasonic wave.Type: GrantFiled: August 26, 1997Date of Patent: August 17, 1999Assignee: Mitsui Chemicals, Inc.Inventors: Atsuo Kobata, Tetsuhiro Matsumoto