Patents by Inventor Naritoshi Hirota

Naritoshi Hirota 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).

  • Patent number: 9382356
    Abstract: A catalyst for olefin polymerization, comprising: (A-1) a bridged metallocene compound represented by the following Formula [1-1], and (b) at least one compound selected from: (b-1) an organoaluminum oxy compound, (b-2) a compound which forms an ion pair, and (b-3) an organoaluminum compound: wherein in Formula [1-1], R1, R2, R3, R4, R5, R8, R9, and R12 are each selected from a hydrogen, a hydrocarbon group and a silicon-containing group; the four groups of R6, R7, R10, and R11 are not hydrogen atoms, and are each selected from a hydrocarbon group or a silicon-containing group; R13 and R14 are each a hydrocarbon group or the like, excluding a hydrogen atom and a methyl group; M is Ti, Zr or the like; Y is carbon or the like; Q is a halogen or the like; and j is an integer from 1 to 4.
    Type: Grant
    Filed: November 16, 2007
    Date of Patent: July 5, 2016
    Assignee: MITSUI CHEMICALS, INC.
    Inventors: Yasushi Tohi, Masahiko Okamoto, Ryoji Mori, Tatsuya Nakamura, Takashi Yukita, Takashi Nakagawa, Miyuki Konno, Yuichi Yamamura, Shiegenobu Ikenaga, Mayumi Hiwara, Naritoshi Hirota, Hiromasa Marubayashi, Kouji Nagahashi, Shiro Otsuzuki, Tomohiro Yamaguchi, Masashi Higuchi, Yasuo Ichiki, Takayuki Kajihara
  • Patent number: 7879960
    Abstract: A high molecular weight propylene polymer exhibiting high stereoregularity (isotactic) and high position selectivity can be effectively produced by polymerizing at least one monomer selected from propylene, ?-olefins and polyenes in the presence of a catalyst for olefin polymerization comprising: (A) a bridged metallocene compound represented by the General Formula [I] given in claims (diphenylmethylene(3-tert-butyl-5-ethyl-cyclopentadienyl)(fluorenyl)zirconium dichloride, etc.); and (B) one or more compound(s) selected from (b-1) an organoaluminumoxy compound (b-2) a compound which reacts with the bridged metallocene compound (A) to form an ion pair, and (b-3) an organoaluminum compound.
    Type: Grant
    Filed: August 29, 2005
    Date of Patent: February 1, 2011
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Munehito Funaya, Naritoshi Hirota, Mayumi Hiwara, Yasushi Tohi, Koji Kawai, Ryoji Mori, Masahiko Okamoto, Shigenobu Ikenaga, Hiromasa Marubayashi
  • Patent number: 7834204
    Abstract: Provided is a transition metal compound represented by the general formula [III]: wherein R23, R24, R25, R26, R27, and R28 are each independently selected from hydrogen, a hydrocarbon group, a silicon-containing group, a sulfur-containing group, an oxygen-containing group, a nitrogen-containing group, and a halogen-containing group, adjacent substituents of R23 to R28 are optionally bonded to each other to form a ring, M is a Group 4 transition metal, Y is carbon atom, Q is selected from halogen, a hydrocarbon group, an anionic ligand and a neutral ligand capable of coordinating with a lone electron pair, which is selected in the same combination or different combination, j is an integer of 1 to 4, and Z is a fluorenylidene group comprising a fluorene derivative formula [I] or formula [II]
    Type: Grant
    Filed: May 24, 2006
    Date of Patent: November 16, 2010
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Munehito Funaya, Koji Endo, Naritoshi Hirota, Yuichi Yamamura, Koji Kawai
  • Patent number: 7803888
    Abstract: A novel olefin-based polymer has excellent thermal resistance, as well as excellent balance among various properties. The olefin-based polymer is an olefin-based polymer comprising 50 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties: i) the diad isotacticity is 70% or greater, ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5, and iii) the intrinsic viscosity [?] is 0.5 (dl/g) or greater.
    Type: Grant
    Filed: June 9, 2005
    Date of Patent: September 28, 2010
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Nobuo Kawahara, Shinichi Kojoh, Shingo Matsuo, Hideyuki Kaneko, Tomoaki Matsugi, Norio Kashiwa, Munehito Funaya, Naritoshi Hirota, Tooru Tanaka, Toshiyuki Hirose, Nobuhisa Mikawa, Kouichi Kizu, Keiji Okada
  • Publication number: 20100190941
    Abstract: Provided is a transition metal compound novel and useful as a catalyst component for olefin polymerization, a catalyst for olefin polymerization containing the transition metal compound, and a process for producing an olefin polymer using the catalyst for polymerization. The transition metal is characterized by being represented by the following general formula [I]: wherein, R3 is hydrogen, R2 is selected from a hydrocarbon group or a silicon-containing group, R1 and R4 are selected from a hydrocarbon group having 2 to 20 carbon atoms and a silicon-containing group, each of R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14, which is selected from hydrogen, a hydrocarbon group and a silicon-containing group, may be same or different from each other, and adjacent groups from R5 to R14 may be bonded to each other to form a ring.
    Type: Application
    Filed: April 2, 2010
    Publication date: July 29, 2010
    Inventors: Munehito Funaya, Naritoshi Hirota, Yuichi Yamamura, Koji Kawai
  • Patent number: 7678934
    Abstract: A transition metal compound represented by the following formula (2a):
    Type: Grant
    Filed: August 4, 2008
    Date of Patent: March 16, 2010
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kawai, Nobuo Kawahara
  • Publication number: 20090253876
    Abstract: Provided is a novel fluorene derivative which is useful as a catalyst component for olefin polymerization, a transition metal compound containing the fluorene derivative as a part of ligand, a catalyst for olefin polymerization containing the transition metal compound, and a process for producing olefin polymer.
    Type: Application
    Filed: May 24, 2006
    Publication date: October 8, 2009
    Inventors: Munehito Funaya, Koji Endo, Naritoshi Hirota, Yuichi Yamamura, Koji Kawai
  • Publication number: 20090043050
    Abstract: A polypropylene composition containing a propylene/1-butene random copolymer which contains 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point of from 40 to 75° C. and a crystallization rate at 45° C. of 10 minutes or less, and satisfying the following relation, 146 exp (?0.022M)?Tm?125 exp (?0.032M), and an olefin catalyst for preparation thereof.
    Type: Application
    Filed: August 4, 2008
    Publication date: February 12, 2009
    Inventors: Shigenobu Ikenaga, Keiji Okada, Hiroshi Hoya, Norihide Inoue, Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kawai, Nobuo Kawahara, Shinichi Kojoh, Norio Kashiwa, Ryoji Mori
  • Publication number: 20090043057
    Abstract: Provided is a transition metal compound novel and useful as a catalyst component for olefin polymerization, a catalyst for olefin polymerization containing the transition metal compound, and a process for producing an olefin polymer using the catalyst for polymerization. The transition metal is characterized by being represented by the following general formula [I]: wherein, R3 is hydrogen, R2 is selected from a hydrocarbon group or a silicon-containing group, R1 and R4 are selected from a hydrocarbon group having 2 to 20 carbon atoms and a silicon-containing group, each of R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14, which is selected from hydrogen, a hydrocarbon group and a silicon-containing group, may be same or different from each other, and adjacent groups from R5 to R14 may be bonded to each other to form a ring.
    Type: Application
    Filed: May 24, 2006
    Publication date: February 12, 2009
    Inventors: Munehito Funaya, Naritoshi Hirota, Yuichi Yamamura, Koji Kawai
  • Patent number: 7488789
    Abstract: A propylene/1-butene random copolymer containing 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point of from 40 to 75° C. and a crystallization rate at 45° C. of 10 minutes or less, and satisfying the following relation, 146 exp (?0.022M)?Tm?125 exp (?0.032M), and an olefin catalyst for preparation thereof.
    Type: Grant
    Filed: December 26, 2003
    Date of Patent: February 10, 2009
    Assignee: Mitsui Chemicals, Inc.
    Inventors: Shigenobu Ikenaga, Keiji Okada, Hiroshi Hoya, Norihide Inoue, Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kawai, Nobuo Kawahara, Shinichi Kojoh, Norio Kashiwa, Ryoji Mori
  • Publication number: 20080312461
    Abstract: A transition metal compound represented by the following formula (2a):
    Type: Application
    Filed: August 4, 2008
    Publication date: December 18, 2008
    Inventors: Shigenobu Ikenaga, Keiji Okada, Hiroshi Takayasu, Norihide Inoue, Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kwawi, Nobuo Kawahara, Shinichi Kojoh, Norio Kashiwa, Ryoji Mori
  • Publication number: 20080306234
    Abstract: A propylene elastomer (PBER) comprising (a) 50 to 85 mol % of units derived from propylene, (b) 5 to 25 mol % of units derived from 1-butene and (c) 10 to 25 mol % of units derived from ethylene, and having a molar ratio of propylene content to ethylene content of from 89/11 to 70/30, and a modulus in tension (YM), as measured in accordance with JIS 6301, of not more than 40 Mpa.
    Type: Application
    Filed: August 4, 2008
    Publication date: December 11, 2008
    Inventors: Shigenobu Ikenaga, Keiji Okada, Hiroshi Takayasu, Norihide Inoue, Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kawai, Nobuo Kawahara, Shinichi Kojoh, Norio Kashiwa, Ryoji Mori
  • Publication number: 20080306219
    Abstract: An olefin polymerization catalyst having (A) a transition metal compound (2a) or (3a) and (B) at least one compound selected from (B-1) an organometallic compound, (B-2) an organoaluminum oxy compound and (B-3) a compound capable of forming an ion pair by reacting with the transition metal compound (A).
    Type: Application
    Filed: August 4, 2008
    Publication date: December 11, 2008
    Inventors: Shigenobu IKENAGA, Keiji OKADA, Hiroshi TAKAYASU, Norihide INOUE, Naritoshi HIROTA, Hiromu KANEYOSHI, Munehito FUNAYA, Koji KAWAI, Nobuo KAWAHARA, Shinichi KOJOH, Norio KASHIWA, Ryoji MORI
  • Publication number: 20080292896
    Abstract: A polypropylene composite film having a propylene/1-butene random copolymer which has 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point of from 40 to 75° C. and a crystallization rate at 45° C. of 10 minutes or less, and satisfying the following relation, 146 exp (?0.022M)?Tm ?125 exp (?0.032M), and an olefin catalyst for preparation thereof.
    Type: Application
    Filed: August 4, 2008
    Publication date: November 27, 2008
    Inventors: Shigenobu Ikenaga, Keiji Okada, Hiroshi Takayasu, Norihide Inoue, Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kawai, Nobuo Kawahara, Shinichi Kojoh, Norio Kashiwa, Ryoji Mori
  • Publication number: 20080220193
    Abstract: A catalyst for olefin polymerization, comprising: (A-1) a bridged metallocene compound represented by the following Formula [1-1], and (b) at least one compound selected from: (b-1) an organoaluminum oxy compound, (b-2) a compound which forms an ion pair, and (b-3) an organoaluminum compound: wherein in Formula [1-1], R1, R2, R3, R4, R5, R8, R9, and R12 are each selected from a hydrogen, a hydrocarbon group and a silicon-containing group; the four groups of R6, R7, R10, and R11 are not hydrogen atoms, and are each selected from a hydrocarbon group or a silicon-containing group; R13 and R14 are each a hydrocarbon group or the like, excluding a hydrogen atom and a methyl group; M is Ti, Zr or the like; Y is carbon or the like; Q is a halogen or the like; and j is an integer from 1
    Type: Application
    Filed: November 16, 2007
    Publication date: September 11, 2008
    Inventors: Yasushi Tohi, Masahiko Okamoto, Ryoji Mori, Tatsuya Nakamura, Takashi Yukita, Takashi Nakagawa, Miyuki Konno, Yuichi Yamamura, Shigenobu Ikenaga, Mayumi Hiwara, Naritoshi Hirota, Hiromasa Marubayashi, Kouji Nagahashi, Shiro Otsuzuki, Tomohiro Yamaguchi, Masashi Higuchi, Yasuo Ichiki, Takayuki Kajihara
  • Publication number: 20080097055
    Abstract: A high molecular weight propylene polymer exhibiting high stereoregularity (isotactic) and high position selectivity can be effectively produced by polymerizing at least one monomer selected from propylene, ?-olefins and polyenes in the presence of a catalyst for olefin polymerization comprising: (A) a bridged metallocene compound represented by the General Formula [I] given in claims (diphenylmethylene(3-tert-butyl-5-ethyl-cyclopentadienyl)(fluorenyl)zirconium dichloride, etc.); and (B) one or more compound(s) selected from (b-1) an organoaluminumoxy compound (b-2) a compound which reacts with the bridged metallocene compound (A) to form an ion pair, and (b-3) an organoaluminum compound.
    Type: Application
    Filed: August 29, 2005
    Publication date: April 24, 2008
    Inventors: Munehito Funaya, Naritoshi Hirota, Mayumi Hiwara, Yasushi Tohi, Koji Kawai, Ryoji Mori, Masahiko Okamoto, Shigenobu Ikenaga, Hiromasa Marubayashi
  • Publication number: 20080038498
    Abstract: A propylene polymer which is constituted of 10 to 40 wt % room-temperature n-decane soluble part (Dsol) and 60 to 90 wt % room-temperature n-decane insoluble part (Dinsol), comprises skeletons derived from propylene (MP) and at least one kind of olefin (MX) selected from ethylene and C4 or more ?-olefins, and satisfies all of the following requirements [1] to [5]. The polymer is characterized by having a high melting point and a high molecular weight and is suitable for use in producing various moldings therefrom. [1] the molecular weight distribution (Mw/Mn) of both Dsol and Dinsol as determined by GPC is 4.0 or less; [2] the melting point (Tm) of Dinsol is 156° C. or more; [3] the sum of the 2,1-bond content and the 1,3-bond content in Dinsol is 0.05 mol % or less; [4] the intrinsic viscosity [?] (dl/g) of Dsol satisfies the relationship 2.2<[?]?6.0; and [5] the concentration of skeletons derived from the olefin (MX) in Dinsol is 3.0 wt % or less.
    Type: Application
    Filed: December 22, 2005
    Publication date: February 14, 2008
    Inventors: Keita Itakura, Munehito Funaya, Ayako Kadosaka, Naritoshi Hirota, Hiroshi Nishikawa, Yuichi Yamamura, Shuji Matsumura, Satoshi Hashizume, Yoshio Sasaki
  • Publication number: 20070249792
    Abstract: A novel olefin-based polymer has excellent thermal resistance, as well as excellent balance among various properties. The olefin-based polymer is an olefin-based polymer comprising 50 to 100% by weight of a constituent unit derived from 4-methyl-1-pentene, and 0 to 50% by weight of a constituent unit derived from at least one olefin selected from olefins having 2 to 20 carbon atoms except 4-methyl-1-pentene, and having the following properties: i) the diad isotacticity is 70% or greater, ii) the ratio (Mw/Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) as measured by gel permeation chromatography (GPC) is in the range of 1.0 to 3.5, and iii) the intrinsic viscosity [?] is 0.5 (dl/g) or greater.
    Type: Application
    Filed: June 9, 2005
    Publication date: October 25, 2007
    Applicant: Mitsui Chemicals, Inc.
    Inventors: Nobuo Kawahara, Shinichi Kojoh, Shingo Matsuo, Hideyuki Kaneko, Tomoaki Matsugi, Norio Kashiwa, Munehito Funaya, Naritoshi Hirota, Tooru Tanaka, Toshiyuki Hirose, Nobuhisa Mikawa, Kouichi Kizu, Keiji Okada
  • Publication number: 20060276607
    Abstract: The present invention provides a propylene/1-butene random copolymer (PBR) having excellent flexibility, impact resistance, heat resistance and low-temperature heat-seal properties, a polypropylene composition containg the copolymer, a sheet, film or stretched film comprising the composition and a composite film having a layer of the composition. The propylene/1-butene random copolymer contains 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution (Mw/Mn) of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point (Tm) of from 40 to 120° C., and satisfies the following relation 146 exp(?0.022M)?Tm?125 exp(?0.032M) wherein Tm represents a melting point and M (mol %) represents a content of 1-butene constituent units.
    Type: Application
    Filed: December 26, 2003
    Publication date: December 7, 2006
    Applicant: MITSUI CHEMICALS, INC.
    Inventors: Shigenobu Ikenaga, Keiji Okada, Hiroshi Takayasu, Norihide Inoue, Naritoshi Hirota, Hiromu Kaneyoshi, Munehito Funaya, Koji Kawai, Nobuo Kawahara, Shinichi Kojoh, Norio Kashiwa, Ryoji Mori