Patents by Inventor Shigeo Mizukami
Shigeo Mizukami 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: 10526427Abstract: A method for producing a solid catalyst component (Aa) for ?-olefin polymerization, which includes: bringing components (A1) to (A4) into contact with one another in an inert solvent; and without washing the contact product with an inert solvent, aging the contact product by keeping for a holding time of 3 days or more and 180 days or less, regarding the time point that all of the components (A1) to (A4) first come into contact, as a starting point.Type: GrantFiled: December 16, 2016Date of Patent: January 7, 2020Assignee: Japan Polypropylene CorporationInventors: Keiji Fukuda, Shouichi Ida, Akio Tanna, Shigeo Mizukami
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Publication number: 20180362673Abstract: A method for producing a solid catalyst component (Aa) for ?-olefin polymerization, which includes: bringing components (A1) to (A4) into contact with one another in an inert solvent; and without washing the contact product with an inert solvent, aging the contact product by keeping for a holding time of 3 days or more and 180 days or less, regarding the time point that all of the components (A1) to (A4) first come into contact, as a starting point.Type: ApplicationFiled: December 16, 2016Publication date: December 20, 2018Applicant: Japan Polypropylene CorporationInventors: Keiji FUKUDA, Shouichi IDA, Akio TANNA, Shigeo MIZUKAMI
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Patent number: 9920196Abstract: An object of the present invention is to prevent an occurrence of flow-mark molding defects to improve an appearance of molded articles, and as a means for achieving the object, a propylene-based block copolymer is used as an appearance improver, the copolymer comprising 80 to 60% by weight of crystalline propylene polymer portion which has an intrinsic viscosity [?]p of 0.90 dL/g or less and 20 to 40% by weight of propylene/ethylene random copolymer portion which has an ethylene content of 35 to 50% by weight and an intrinsic viscosity [?]c of 7.0 dL/g or higher ([?]c/[?]p being 7.5 to 30), in which the propylene-based block copolymer has a MFR of 10 to 50 g/10 min.Type: GrantFiled: June 19, 2014Date of Patent: March 20, 2018Assignee: JAPAN POLYPROPYLENE CORPORATIONInventors: Tomohiro Hosoi, Shigeo Mizukami, Masahiro Nagata, Kouichi Nakayama, Yuji Ryosho
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Patent number: 9884958Abstract: An object of the present invention is to prevent an occurrence of flow-mark molding defects to improve an appearance of molded articles, and as a means for achieving the object, a propylene-based block copolymer is used as an appearance improver, the copolymer comprising 80 to 60% by weight of crystalline propylene polymer portion which has an intrinsic viscosity [?]p of 0.90 dL/g or less and 20 to 40% by weight of propylene/ethylene random copolymer portion which has an ethylene content of 35 to 50% by weight and an intrinsic viscosity [?]c of 7.0 dL/g or higher ([?]c/[?]p being 7.5 to 30), in which the propylene-based block copolymer has a MFR of 10 to 50 g/10 min.Type: GrantFiled: June 19, 2014Date of Patent: February 6, 2018Assignee: JAPAN POLYPROPYLENE CORPORATIONInventors: Tomohiro Hosoi, Shigeo Mizukami, Masahiro Nagata, Kouichi Nakayama, Yuji Ryosho
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Publication number: 20160137831Abstract: An object of the present invention is to prevent an occurrence of flow-mark molding defects to improve an appearance of molded articles, and as a means for achieving the object, a propylene-based block copolymer is used as an appearance improver, the copolymer comprising 80 to 60% by weight of crystalline propylene polymer portion which has an intrinsic viscosity [?]p of 0.90 dL/g or less and 20 to 40% by weight of propylene/ethylene random copolymer portion which has an ethylene content of 35 to 50% by weight and an intrinsic viscosity [?]c of 7.0 dL/g or higher ([?]c/[?]p being 7.5 to 30), in which the propylene-based block copolymer has a MFR of 10 to 50 g/10 min.Type: ApplicationFiled: June 19, 2014Publication date: May 19, 2016Applicant: JAPAN POLYPROPYLENE CORPORATIONInventors: Tomohiro HOSOI, Shigeo MIZUKAMI, Masahiro NAGATA, Kouichi NAKAYAMA, Yuji RYOSHO
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Patent number: 8735513Abstract: A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.Type: GrantFiled: November 5, 2010Date of Patent: May 27, 2014Assignee: Japan Polypropylene CorporationInventors: Takanori Nakashima, Katsuhiko Oono, Kenji Mitsutani, Takao Tayano, Tomoyuki Yoshida, Shigeo Mizukami, Yusuke Yamada
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Patent number: 8546497Abstract: A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.Type: GrantFiled: November 5, 2010Date of Patent: October 1, 2013Assignee: Japan Polypropylene CorporationInventors: Takanori Nakashima, Katsuhiko Oono, Kenji Mitsutani, Takao Tayano, Tomoyuki Yoshida, Shigeo Mizukami, Yusuke Yamada
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Publication number: 20120264893Abstract: A propylene polymerization reaction apparatus and a production method of a propylene-based polymer are capable of producing a continuous multi-stage polymer in low cost, high productivity and stably, and significantly reducing generation amount of an off-specification product accompanying change of polymerization condition, in multi-stage continuous vapor phase polymerization method of a propylene-based polymer using a catalyst for olefin polymerization. A reaction apparatus for producing a propylene-based polymer by a multi-stage continuous vapor phase polymerization method is used. One or more reactor of a horizontal-type reactor having inside a stirring machine which rotates around a horizontal axis, and a continuous stirred tank reactor to be connected to the horizontal-type reactor are provided, and a production method of a propylene-based polymer using the same.Type: ApplicationFiled: November 5, 2010Publication date: October 18, 2012Applicant: JAPAN POLYPROPYLENE CORPORATIONInventors: Takanori Nakashima, Katsuhiko Oono, Kenji Mitsutani, Takao Tayano, Tomoyuki Yoshida, Shigeo Mizukami, Yusuke Yamada
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Patent number: 8211978Abstract: A moldability modifier capable of improving molding processability, and a polypropylene resin composition using the same suitable for automobile exterior parts are provided. The invention relates to a moldability modifier comprising propylene block copolymer (A) containing from 80 to 98 wt % of a propylene homopolymer portion (A1) and from 2 to 20 wt % of a propylene/ethylene random copolymer portion (A2), wherein the MFR of (A1) is 300 g/10 min or more, the ethylene content of (A2) is from 10 to 70 wt %, the [?] of (A2) is 6.5 dl/g or more, and the MFR as a whole is 40 g/10 min or more; and propylene block copolymer (B) containing from 20 to 79 wt % of a propylene polymer portion (B1) and from 21 to 80 wt % of a propylene/ethylene random copolymer portion (B2), wherein the MFR of (B1) is 20 g/10 min or more, the ethylene content of (B2) is from 20 to 70 wt %, the [?] of (B2) is from 2.5 to 9.0 dl/g, and the MFR as a whole is from 0.1 to 50 g/10 min; and a polypropylene resin composition using the same.Type: GrantFiled: March 23, 2007Date of Patent: July 3, 2012Assignee: Japan Polypropylene CorporationInventors: Yukihito Zanka, Yuji Ryosho, Ken Shimizu, Masashi Shimouse, Shigeo Mizukami
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Polypropylene block copolymer, uses thereof, and polypropylene resin composition containing the same
Patent number: 7847010Abstract: Provided are a molding appearance modifier for resins capable of controlling appearance of large-sized molded parts only by small addition, and a polypropylene resin composition capable of providing good appearance to, for example, automobile exterior parts, and has excellent molding processability. The invention relates to a propylene block copolymer having a crystalline propylene polymer portion and a propylene•ethylene random copolymer portion, wherein the crystalline propylene polymer portion has an intrinsic viscosity [?]homo of 1.2 dl/g or less; the propylene•ethylene random copolymer portion has an ethylene content of 30 to 70 wt. %, has an intrinsic viscosity [?]copoly of 2.5 to 7.0 dl/g, and is added in an amount of 40 to 80 wt. % based on the whole propylene block copolymer; and the propylene block copolymer, in its entirety, has a melt flow rate of 0.1 to 10 g/10 min; and a [?]copoly/[?]homo ratio falls within a range of 2.Type: GrantFiled: January 12, 2006Date of Patent: December 7, 2010Assignee: Japan Polypropylene CorporationInventors: Akihiro Suzuki, Shigeo Mizukami, Yukihito Zanka -
Publication number: 20090292060Abstract: Provided are a molding appearance modifier for resins capable of controlling appearance of large-sized molded parts only by small addition, and a polypropylene resin composition capable of providing good appearance to, for example, automobile exterior parts, and has excellent molding processability. The invention relates to a propylene block copolymer having a crystalline propylene polymer portion and a propylene•ethylene random copolymer portion, wherein the crystalline propylene polymer portion has an intrinsic viscosity [?]homo of 1.2 dl/g or less; the propylene•ethylene random copolymer portion has an ethylene content of 30 to 70 wt. %, has an intrinsic viscosity [?]copoly of 2.5 to 7.0 dl/g, and is added in an amount of 40 to 80 wt. % based on the whole propylene block copolymer; and the propylene block copolymer, in its entirety, has a melt flow rate of 0.1 to 10 g/10 min; and a [?]copoly/[?]homo ratio falls within a range of 2.Type: ApplicationFiled: January 12, 2006Publication date: November 26, 2009Applicant: JAPAN POLYPROPYLENE CORPORATIONInventors: Akihiro Suzuki, Shigeo Mizukami, Yukihito Zanka
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Publication number: 20090131576Abstract: A moldability modifier capable of improving molding processability, and a polypropylene resin composition using the same suitable for automobile exterior parts are provided. The invention relates to a moldability modifier comprising propylene block copolymer (A) containing from 80 to 98 wt % of a propylene homopolymer portion (A1) and from 2 to 20 wt % of a propylene/ethylene random copolymer portion (A2), wherein the MFR of (A1) is 300 g/10 min or more, the ethylene content of (A2) is from 10 to 70 wt %, the [?] of (A2) is 6.5 dl/g or more, and the MFR as a whole is 40 g/10 min or more; and propylene block copolymer (B) containing from 20 to 79 wt % of a propylene polymer portion (B1) and from 21 to 80 wt % of a propylene/ethylene random copolymer portion (B2), wherein the MFR of (B1) is 20 g/10 min or more, the ethylene content of (B2) is from 20 to 70 wt %, the [?] of (B2) is from 2.5 to 9.0 dl/g, and the MFR as a whole is from 0.1 to 50 g/10 min; and a polypropylene resin composition using the same.Type: ApplicationFiled: March 23, 2007Publication date: May 21, 2009Applicant: JAPAN POLYPROPYLENE CORPORATIONInventors: Yukihito Zanka, Yuji Ryosho, Ken Shimizu, Masashi Shimouse, Shigeo Mizukami
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Patent number: 7390575Abstract: A polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt % produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0° C. or lower in the temperature-loss tangent (tan ?) curve obtained by dynamic mechanical analysis (DMA).Type: GrantFiled: October 18, 2004Date of Patent: June 24, 2008Assignee: Japan Polypropylene CorporationInventors: Takao Tayano, Kuninori Takahashi, Iku Kouzai, Shinichi Kitade, Shigeo Mizukami, Koichi Hirayama
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Publication number: 20050113517Abstract: A polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt % produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0° C. or lower in the temperature-loss tangent (tan?) curve obtained by dynamic mechanical analysis (DMA).Type: ApplicationFiled: October 18, 2004Publication date: May 26, 2005Applicant: JAPAN POLYPROPYLENE CORPORATIONInventors: Takao Tayano, Kuninori Takahashi, Iku Kouzai, Shinichi Kitade, Shigeo Mizukami, Koichi Hirayama
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Patent number: 6417275Abstract: A propylene-based copolymer composition comprises: 10 to 60% by weight of a polymer component (A) comprising propylene as a main component and having an isotactic index of not less than 90%; and 40 to 90% by weight of a copolymer component (B) comprising propylene and other &agr;-olefin having not more than 8 carbon atoms and containing propylene and ethylene as essential components, the copolymer component containing cold xylene insolubles in an amount of from more than 20 to 70% by weight based on the weight of whole polymers, and cold xylene solubles in an amount of 10 to 60% by weight based on the weight of whole polymers, and cold xylene solubles containing an &agr;-olefin other than propylene in an amount of less than 20% by weight, and the composition being obtained by first producing the component (A) by polymerization and then producing the component (B) by polymerization.Type: GrantFiled: December 6, 2000Date of Patent: July 9, 2002Assignee: Mitsubishi Chemical CorporationInventors: Kenjiro Takayanagi, Tatsumi Tsuji, Shigeo Mizukami
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Publication number: 20010034416Abstract: A propylene-based copolymer composition comprises:Type: ApplicationFiled: December 6, 2000Publication date: October 25, 2001Inventors: Kenjiro Takayanagi, Tatsumi Tsuji, Shigeo Mizukami
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Patent number: 6294611Abstract: There is provided an olefin thermoplastic elastomer composition comprising the following components (A) and (B), said composition having been produced by first polymerizing a monomer of the component (A) and then polymerizing monomers of the component (B), said composition having such fractionation properties that, in temperature rising elution fractionation in the temperature range of 0 to 140° C. using o-dichlorobenzene as a solvent, the eluate obtained at 0° C. is 35 to 60% by weight based on the total elution weight and the eluate obtained at 80 to 100° C. is 1 to 5% by weight based on the total elution weight: (A) 30 to 60% by weight, based on the whole composition, of a propylene homopolymer component having an isotactic index of not less than 90%; and (B) 40 to 70% by weight, based on the whole composition, of a copolymer of propylene with other &agr;-olefin having 2 to 8 carbon atoms, said copolymer comprising propylene and ethylene as indispensable components.Type: GrantFiled: October 12, 1999Date of Patent: September 25, 2001Assignee: Mitsubishi Chemical CorporationInventors: Kenjiro Takayanagi, Tatsumi Tsuji, Shigeo Mizukami, Shiroh Gotoh