Patents by Inventor Satoshi Hashizume
Satoshi Hashizume 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: 10370465Abstract: Propylene polymers and propylene resin compositions containing the polymers are used as molded articles used under stress for a long period such as automotive parts, housing parts, home appliance parts and electric power tool parts. Stress-resistant molded articles of the invention are obtained from these materials. A propylene homopolymer (A) satisfies the following requirements (1) to (3), and a polypropylene resin composition contains the propylene homopolymer (A). (1) The ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) according to GPC is in the range of 1.2 to 3.5. (2) Mn is in the range of 35,000 to 400,000. (3) The content of components soluble in o-dichlorobenzene at 90° C. is not more than 4 wt %.Type: GrantFiled: January 17, 2008Date of Patent: August 6, 2019Assignees: PRIME POLYMER CO., LTD., MITSUI CHEMICALS, INC.Inventors: Keita Itakura, Toshiyuki Ishii, Rikuo Onishi, Satoshi Hashizume
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Patent number: 8901240Abstract: [Object] To provide a polypropylene resin composition for use in the formation of a microporous membrane having excellent heat resistance and low thermal shrinkage ratio. [Solution] A polypropylene resin composition for use in the formation of a microporous membrane according to the present invention comprises as an essential component a propylene homopolymer (A) that satisfies the following requirements (1) to (4) and (7): (1) the intrinsic viscosity [?] is 1 dl/g or more and less than 7 dl/g; (2) the mesopentad fraction ranges from 94.0% to 99.5%; (3) the integral elution volume during heating to 100° C. is 10% or less; (4) the melting point ranges from 153° C. to 167° C.; and (7) in an elution temperature-elution volume curve, the maximum peak has a peak top temperature in the range of 105° C. to 130° C. and a half-width of 7.0° C. or less.Type: GrantFiled: January 6, 2010Date of Patent: December 2, 2014Assignees: Mitsui Chemicals Inc., Prime Polymer Co., Ltd.Inventors: Satoshi Tamura, Keita Itakura, Ryoichi Tsunori, Satoshi Hashizume
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Publication number: 20140031459Abstract: It is an object of the present invention to provide a modified propylene resin containing very small amounts of low-crystalline and low-molecular-weight components. The present invention relates to a modified propylene resin characterized by satisfying the following requirements (1) to (4). (1) The melting point (Tm) measured with a differential scanning calorimeter (DSC) is 140° C. or higher. (2) The amount of grafts of ethylenic unsaturated bond-containing monomer after hot xylene washing is 0.1 to 5 percent by weight. (3) The amount of components soluble in o-dichlorobenzene at 70° C. is 1.5 percent by weight or less. (4) The intrinsic viscosity [?] is 0.1 to 4 dl/g.Type: ApplicationFiled: September 26, 2013Publication date: January 30, 2014Applicants: Prime Polymer Co., Ltd., Mitsui Chemicals, Inc.Inventors: Keita ITAKURA, Toru IWASHITA, Satoshi HASHIZUME, Rikuo OHNISHI, Hirofumi GODA
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Patent number: 8288495Abstract: [Object] To provide a propylene homopolymer suitable for capacitor films having high withstand voltage and a stretched film formed by stretching the propylene homopolymer. [Solution] A propylene homopolymer of the present invention for capacitors satisfies the following requirements (i) to (v) and (ix): (i) the MFR is 1 to 10 g/10 minutes; (ii) the meso pentad fraction (mmmm) measured by 13C-NMR is 0.940 to 0.995; (iii) the integrted amount of elution at 90° C. by CFC using o-dichlorobenzene is 0.5% by weight or less; (iv) the melting point measured using DSC is 152° C. or more; (v) the chlorine content is 2 ppm by weight or less; and (ix) in an elution temperature-elution volume curve measured by cross-fractionation chromatography (CFC) using o-dichlorobenzene, the maximum peak has a peak top temperature in the range of 105° C. to 130° C. and half width of 7.0° C. or less.Type: GrantFiled: January 26, 2010Date of Patent: October 16, 2012Assignees: Mitsui Chemicals, Inc., Prime Polymer Co., Ltd.Inventors: Satoshi Tamura, Keita Itakura, Satoshi Hashizume
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Publication number: 20110301309Abstract: [Object] To provide a propylene homopolymer suitable for capacitor films having high withstand voltage and a stretched film formed by stretching the propylene homopolymer. [Solution] A propylene homopolymer of the present invention for capacitors satisfies the following requirements (i) to (v) and (ix): (i) the MFR is 1 to 10 g/10 minutes; (ii) the meso pentad fraction (mmm) measured by 13C-NMR is 0.940 to 0.995; (iii) the integrted amount of elution at 90° C. by CFC using o-dichlorobenzene is 0.5% by weight or less; (iv) the melting point measured using DSC is 152° C. or more; (v) the chlorine content is 2 ppm by weight or less; and (ix) in an elution temperature-elution volume curve measured by cross-fractionation chromatography (CFC) using o-dichlorobenzene, the maximum peak has a peak top temperature in the range of 105° C. to 130° C. and half width of 7.0° C. or less.Type: ApplicationFiled: January 26, 2010Publication date: December 8, 2011Inventors: Satoshi Tamura, Keita Itakura, Satoshi Hashizume
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Publication number: 20110294016Abstract: [Object] To provide a polypropylene resin composition for use in the formation of a microporous membrane having excellent heat resistance and low thermal shrinkage ratio. [Solution] A polypropylene resin composition for use in the formation of a microporous membrane according to the present invention comprises as an essential component a propylene homopolymer (A) that satisfies the following requirements (1) to (4) and (7): (1) the intrinsic viscosity [?] is 1 dl/g or more and less than 7 dl/g; (2) the mesopentad fraction ranges from 94.0% to 99.5%; (3) the integral elution volume during heating to 100° C. is 10% or less; (4) the melting point ranges from 153° C. to 167° C.; and (7) in an elution temperature-elution volume curve, the maximum peak has a peak top temperature in the range of 105° C. to 130° C. and a half-width of 7.0° C. or less.Type: ApplicationFiled: January 6, 2010Publication date: December 1, 2011Applicants: PRIME POLYMER CO., LTD., MITSUI CHEMICALS, INC.Inventors: Satoshi Tamura, Keita Itakura, Ryoichi Tsunori, Satoshi Hashizume
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Publication number: 20100280153Abstract: It is an object of the present invention to provide a modified propylene resin containing very small amounts of low-crystalline and low-molecular-weight components. The present invention relates to a modified propylene resin characterized by satisfying the following requirements (1) to (4). (1) The melting point (Tm) measured with a differential scanning calorimeter (DSC) is 140° C. or higher. (2) The amount of grafts of ethylenic unsaturated bond-containing monomer after hot xylene washing is 0.1 to 5 percent by weight. (3) The amount of components soluble in o-dichlorobenzene at 70° C. is 1.5 percent by weight or less. (4) The intrinsic viscosity [?] is 0.1 to 4 dl/g.Type: ApplicationFiled: January 8, 2009Publication date: November 4, 2010Inventors: Keita Itakura, Toru Iwashita, Satoshi Hashizume, Rikuo Ohnishi, Hirofuni Goda
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Publication number: 20100234810Abstract: It is an object of the present invention to provide a polypropylene resin for syringe that can be used as a raw material for syringe that is excellent in sanitary property, heat resistance and transparency and hardly elutes low molecular weight substance and that can prevent formation of foam during molding, achieve long-run moldability and being prevented from scratches when removed from a core molding die in injection molding at satisfactory levels that have not been achieved conventionally. The polypropylene resin for syringe of the present invention comprises an ethylene-propylene block copolymer (A) having a melt flow rate (ASTM D 1238, 230° C., 2.16 kg load) of 10 to 60 g/10 min and being constituted of 85 to 97% by weight of a room-temperature n-decane-insoluble portion (Dinsol) and 3 to 15% by weight of a room-temperature n-decane-soluble portion (Dsol) (the total amount of the Dinsol and the Dsol is 100% by weight), wherein the Dinsol and the Dsol satisfy specific requirements.Type: ApplicationFiled: September 22, 2008Publication date: September 16, 2010Applicants: MITSUI CHEMICALS, INC., PRIME POLYMER CO., LTD.Inventors: Takashi Arai, Hiroyuki Uekita, Keita Itakura, Satoshi Hashizume
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Publication number: 20100004384Abstract: The propylene homopolymers and the polypropylene resin compositions containing the propylene homopolymers according to the present invention give molded articles excellent in vibration fatigue strength and creep properties. The molded articles are therefore suitably used as parts requiring reliability for a long period such as automotive parts and housing parts.Type: ApplicationFiled: January 17, 2008Publication date: January 7, 2010Inventors: Keita Itakura, Toshiyuki Ishii, Rikuo Onishi, Satoshi Hashizume
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Publication number: 20090317615Abstract: Packaging propylene resin compositions are excellent in balance in high transparency, rigidity, low-temperature impact resistance and blocking resistance. Retort films, protective films, medical container packaging films and freshness-keeping films, and sheets for similar purposes are obtained from the compositions. A packaging propylene resin composition includes a propylene polymer (A) satisfying specific requirements and a propylene/ethylene copolymer (B) satisfying specific requirements. In another packaging propylene resin composition, Dinsol and Dsol satisfy specific requirements.Type: ApplicationFiled: August 6, 2007Publication date: December 24, 2009Inventors: Keita Itakura, Tokutaro Kimura, Mitsuo Kawata, Satoshi Hashizume, Masashi Higuchi, Munehito Funaya
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Publication number: 20090069523Abstract: The invention provides a propylene random block copolymer (A) that has a melt flow rate from 0.1 to 100 g/10 min and a melting point from 100 to 155° C. and includes 90 to 60% by weight of a portion insoluble (Dinsol) in n-decane at room temperature and 10 to 40% by weight of a portion soluble (Dsol) in n-decane at room temperature, wherein the Dinsol satisfies the following requirements (1) through (3) and the Dsol satisfies the following requirements (4) through (6). The invention further provides molded articles such as sheets, films, injection molded articles, hollow molded articles, injection blow molded articles and fibers, which are formed of the propylene random block copolymer (A) or a propylene resin composition containing the propylene random block copolymer (A). (1) The molecular weight distribution (Mw/Mn) obtained by GPC of the Dinsol is from 1.0 to 3.5, (2) the content of skeletons derived from ethylene in the Dinsol is from 0.Type: ApplicationFiled: March 27, 2007Publication date: March 12, 2009Inventors: Keita Itakura, Satoshi Hashizume, Kunihiko Takesue, Munehito Funaya
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Publication number: 20080293898Abstract: Disclosed is a catalyst for olefin polymerization, comprising: Component [A]: a prepolymer obtained by olefin prepolymerization on solid titanium catalyst component having an average particle size of 25 to 70 ?m produced by contacting of a solid component (i) having an average particle size of 26 to 75 ?m, containing magnesium, titanium, halogen, and an electron donor (c3), and being free from detachment of titanium by washing with hexane at 25° C., a polar compound (ii) having a dipole moment of 0.50 to 4.Type: ApplicationFiled: June 24, 2005Publication date: November 27, 2008Applicant: MITSUI CHEMICALS, INC.Inventors: Masashi Higuchi, Shuji Matsumura, Yoshio Sasaki, Kiyomi Morita, Satoshi Hashizume
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Patent number: 7402638Abstract: The present invention relates to a propylene random copolymer which satisfies the following requirements [1] to [4], and to various useful molded products obtained by molding the propylene random copolymer: [1] the concentration (Pa, % by mole) of a skeletal constituent derived from propylene (a), and the concentration (Px, % by mole) of a skeletal constituent derived from at least one olefin selected from ethylene (b) and ?-olefins having 4 to 20 carbon atoms (c), each of which is contained in the propylene random copolymer, satisfy the following relational expressions (Eq-1) to (Eq-3): 85?Pa<100??(Eq-1) 0<Px?15??(Eq-2) Pa+Px=100;??(Eq-3) [2] the concentration (Pa, % by mole) of the skeletal constituent derived from propylene (a) contained in the propylene random copolymer, and the melting point (Tm) measured with a differential scanning calorimeter satisfy the following relational expression (Eq-4): 135?4×(100?Pa)<Tm<165?4×(100?Pa);??(Eq-4) [3] the total amount of 2,1-bonded and 1,3-bonType: GrantFiled: August 20, 2004Date of Patent: July 22, 2008Assignee: Mitsui Chemicals, Inc.Inventors: Shuji Matsumura, Keita Itakura, Satoshi Hashizume, Akihiro Inukai, Kouichirou Yamamoto, Ayako Kadosaka, Yoshio Sasaki, Masashi Higuchi, Hiroshi Nishikawa
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Publication number: 20080038498Abstract: 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: ApplicationFiled: December 22, 2005Publication date: February 14, 2008Inventors: Keita Itakura, Munehito Funaya, Ayako Kadosaka, Naritoshi Hirota, Hiroshi Nishikawa, Yuichi Yamamura, Shuji Matsumura, Satoshi Hashizume, Yoshio Sasaki
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Publication number: 20060222849Abstract: The present invention relates to a propylene random copolymer which satisfies the following requirements [1] to [4], and to various useful molded products obtained by molding the propylene random copolymer: [1] the concentration (Pa, % by mole) of a skeletal constituent derived from propylene (a), and the concentration (Px, % by mole) of a skeletal constituent derived from at least one olefin selected from ethylene (b) and ?-olefins having 4 to 20 carbon atoms (c), each of which is contained in the propylene random copolymer, satisfy the following relational expressions (Eq-1) to (Eq-3): 85?Pa<100 ??(Eq-1) 0<Px?15 ??(Eq-2) Pa+Px=100 ??(Eq-3); [2] the concentration (Pa, % by mole) of the skeletal constituent derived from propylene (a) contained in the propylene random copolymer, and the melting point (Tm) measured with a differential scanning calorimeter satisfy the following relational expression (Eq-4): 135?4×(100?Pa)<Tm<165?4×(100?Pa) ??(Eq-4); [3] the total amount of 2,1-bonded and 1,3-Type: ApplicationFiled: August 20, 2004Publication date: October 5, 2006Inventors: Shuji Matsumura, Keita Itakura, Satoshi Hashizume, Akihiro Inukai, Kouichirou Yamamoto, Ayako Kadosaka, Yoshio Sasaki, Masashi Higuchi, Hiroshi Nishikawa
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Patent number: 5393876Abstract: A polyacyl maltooligosaccharide derivative which is a precursor of a maltooligosaccharide derivative having modified groups at the 6-position or 4- and 6-positions of non-reducing end glucose unit and being effectively used as a substrate for measuring .alpha.-amylase activity, can be produced under mild conditions by crosslinking OH groups in the non-reducing end glucose unit of oligosaccharide with a benzylidene group having an alkoxy group, followed by acylation and treatment with a dilute acid.Type: GrantFiled: April 9, 1993Date of Patent: February 28, 1995Assignee: Wako Pure Chemical Industries, Ltd.Inventors: Atsunori Sano, Satoshi Hashizume, Hiroyuki Tsurumoto