Patents by Inventor Mayumi Hiwara
Mayumi Hiwara 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: 11760819Abstract: The purpose of the present invention is to obtain an ethylene??-olefin?non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene??-olefin?non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an ?-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4) 125° C. is 5-100, and (4) the B value is 1.20 or more.Type: GrantFiled: December 23, 2020Date of Patent: September 19, 2023Assignee: MITSUI CHEMICALS, INC.Inventors: Koji Endo, Mayumi Hiwara, Sadahiko Matsuura, Yusuke Mizobuchi, Yuichi Yamamura, Yuji Noguchi, Yuji Ishii, Tatsuya Sakai, Keisuke Shishido, Kotaro Ichino, Kiyohide Inomata, Fumito Takeuchi, Kenta Ide
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Patent number: 11613595Abstract: The purpose of the present invention is to obtain an ethylene??-olefin?non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene??-olefin?non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an ?-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4)125° C. is 5-100, and (4) the B value is 1.20 or more.Type: GrantFiled: December 23, 2020Date of Patent: March 28, 2023Assignee: MITSUI CHEMICALS, INC.Inventors: Koji Endo, Mayumi Hiwara, Sadahiko Matsuura, Yusuke Mizobuchi, Yuichi Yamamura, Yuji Noguchi, Yuji Ishii, Tatsuya Sakai, Keisuke Shishido, Kotaro Ichino, Kiyohide Inomata, Fumito Takeuchi, Kenta Ide
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Publication number: 20210122861Abstract: The purpose of the present invention is to obtain an ethylene??-olefin?non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene??-olefin?non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an ?-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4) 125° C. is 5-100, and (4) the B value is 1.20 or more.Type: ApplicationFiled: December 23, 2020Publication date: April 29, 2021Applicant: MITSUI CHEMICALS, INC.Inventors: Koji ENDO, Mayumi HIWARA, Sadahiko MATSUURA, Yusuke MIZOBUCHI, Yuichi YAMAMURA, Yuji NOGUCHI, Yuji ISHII, Tatsuya SAKAI, Keisuke SHISHIDO, Kotaro ICHINO, Kiyohide INOMATA, Fumito TAKEUCHI, Kenta IDE
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Publication number: 20210122860Abstract: The purpose of the present invention is to obtain an ethylene??-olefin?non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene??-olefin?non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an ?-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4)125° C. is 5-100, and (4) the B value is 1.20 or more.Type: ApplicationFiled: December 23, 2020Publication date: April 29, 2021Applicant: MITSUI CHEMICALS, INC.Inventors: Koji ENDO, Mayumi HIWARA, Sadahiko MATSUURA, Yusuke MIZOBUCHI, Yuichi YAMAMURA, Yuji NOGUCHI, Yuji ISHII, Tatsuya SAKAI, Keisuke SHISHIDO, Kotaro ICHINO, Kiyohide INOMATA, Fumito TAKEUCHI, Kenta IDE
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Patent number: 10919997Abstract: The purpose of the present invention is to obtain an ethylene.?-olefin.non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene.?-olefin.non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an ?-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4)125° C. is 5-100, and (4) the B value is 1.20 or more.Type: GrantFiled: February 10, 2015Date of Patent: February 16, 2021Assignee: MITSUI CHEMICALS, INC.Inventors: Koji Endo, Mayumi Hiwara, Sadahiko Matsuura, Yusuke Mizobuchi, Yuichi Yamamura, Yuji Noguchi, Yuji Ishii, Tatsuya Sakai, Keisuke Shishido, Kotaro Ichino, Kiyohide Inomata, Fumito Takeuchi, Kenta Ide
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Patent number: 9969827Abstract: A process capable of producing an ethylene/?-olefin copolymer having a high molecular weight even under the conditions of a high polymerization temperature is provided. The process for producing an ethylene/?-olefin copolymer includes copolymerizing ethylene and an ?-olefin having 3 or more carbon atoms in the presence of an olefin polymerization catalyst including a crosslinked metallocene compound (A) represented by the following general formula [I] and a cocatalyst component (B). In the general formula [I], Y is selected from a carbon atom, etc., M is a hafnium atom or the like, R1 to R12 are each selected from a hydrogen atom, a hydrocarbon group, etc., R13 and R14 are each a substituted aryl group or the like, at least one of R13 and R14 is a substituted aryl group having one or more electron-donating substituents having a Hammett substituent constant ? of not more than ?0.2, Q is selected from a halogen atom, etc., and j is an integer of 1 to 4.Type: GrantFiled: February 10, 2015Date of Patent: May 15, 2018Assignee: MITSUI CHEMICALS, INC.Inventors: Koji Endo, Mayumi Hiwara, Sadahiko Matsuura, Yoko Kosugi, Yuichi Yamamura, Yusuke Mizobuchi
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Publication number: 20170183432Abstract: A process capable of producing an ethylene/?-olefin copolymer having a high molecular weight even under the conditions of a high polymerization temperature is provided. The process for producing an ethylene/?-olefin copolymer includes copolymerizing ethylene and an ?-olefin having 3 or more carbon atoms in the presence of an olefin polymerization catalyst including a crosslinked metallocene compound (A) represented by the following general formula [I] and a cocatalyst component (B). In the general formula [I], Y is selected from a carbon atom, etc., M is a hafnium atom or the like, R1 to R12 are each selected from a hydrogen atom, a hydrocarbon group, etc., R13 and R14 are each a substituted aryl group or the like, at least one of R13 and R14 is a substituted aryl group having one or more electron-donating substituents having a Hammett substituent constant ? of not more than ?0.2, Q is selected from a halogen atom, etc., and j is an integer of 1 to 4.Type: ApplicationFiled: February 10, 2015Publication date: June 29, 2017Applicant: MITSUI CHEMICALS, INC.Inventors: Koji ENDO, Mayumi HIWARA, Sadahiko MATSUURA, Yoko KOSUGI, Yuichi YAMAMURA, Yusuke MIZOBUCHI
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Publication number: 20160347894Abstract: The purpose of the present invention is to obtain an ethylene•?-olefin•non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene•?-olefin•non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an ?-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40/60-90/10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4)125° C. is 5-100, and (4) the B value is 1.20 or more.Type: ApplicationFiled: February 10, 2015Publication date: December 1, 2016Applicant: MITSUI CHEMICALS, INC.Inventors: Koji ENDO, Mayumi HIWARA, Sadahiko MATSUURA, Yusuke MIZOBUCHI, Yuichi YAMAMURA, Yuji NOGUCHI, Yuji ISHII, Tatsuya SAKAI, Keisuke SHISHIDO, Kotaro ICHINO, Kiyohide INOMATA, Fumito TAKEUCHI, Kenta IDE
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Patent number: 9382356Abstract: 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: GrantFiled: November 16, 2007Date of Patent: July 5, 2016Assignee: 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
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Patent number: 7879960Abstract: 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: GrantFiled: August 29, 2005Date of Patent: February 1, 2011Assignee: Mitsui Chemicals, Inc.Inventors: Munehito Funaya, Naritoshi Hirota, Mayumi Hiwara, Yasushi Tohi, Koji Kawai, Ryoji Mori, Masahiko Okamoto, Shigenobu Ikenaga, Hiromasa Marubayashi
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Publication number: 20080220193Abstract: 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 1Type: ApplicationFiled: November 16, 2007Publication date: September 11, 2008Inventors: 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
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Publication number: 20080097055Abstract: 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: ApplicationFiled: August 29, 2005Publication date: April 24, 2008Inventors: Munehito Funaya, Naritoshi Hirota, Mayumi Hiwara, Yasushi Tohi, Koji Kawai, Ryoji Mori, Masahiko Okamoto, Shigenobu Ikenaga, Hiromasa Marubayashi
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Publication number: 20060069248Abstract: The present invention provides high purity phosphoroamidite products by reducing the amount of impurities of triphosphite which has been additionally produced according to the conventional technique. Phosphoroamidites can be obtained with high purity such that the excess reaction is suppressed by using a reaction activator hardly generating triphosphite. According to the present invention, phosphoroamides can be obtained with high purity, which has heretofore been difficult to suppress the generation of impurities of triphosphite.Type: ApplicationFiled: December 4, 2003Publication date: March 30, 2006Applicant: MITSUI CHEMICALS, INC.Inventors: Hironori Komatsu, Mayumi Hiwara