Patents by Inventor Ikunori Sakai
Ikunori Sakai 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: 5883174Abstract: A polypropylene resin composition having excellent rigidity, impact resistance and formability (moldability) and thus useful for the interior parts of automobile, includes (A) a crystalline E/P block copolymer containing a fraction Ac soluble in p-xylene at room temperature and having an ethylene content of 18 to 22%; (B) a crystalline E/P block copolymer containing a fraction Bc soluble in p-xylene at room temperature and having an ethylene content of 27 to 40% and (C) talc particles having an average size of 3 to 5 .mu.m and largest size less than 20 .mu.m, in which composition, (a) the p-xylene-soluble fractions Ac and Bc are in contents As and Bs based on the total weight of the copolymers (A) and (B) and satisfying As+Bs=7 to 17% by weight and As/(A +Bs)=0.1 to 0.6; (b) an isotactic pentad fraction of propylene in each of copolymers (A) and (B) is 96% or more, and the mixture of the copolymers (A) and (B) has a MFR of 20 to 35 g/10 min at 230.degree. C.Type: GrantFiled: July 16, 1996Date of Patent: March 16, 1999Assignees: Ube Industries, Ltd., Toyota Jidosha Kabushiki KaishaInventors: Tomohiko Akagawa, Ikunori Sakai, Saburo Hinenoya, Yasuo Kita, Kaoru Inoue, Takeyoshi Nishio, Takao Nomura
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Patent number: 5837764Abstract: A polypropylene resin composition comprising the following components (A), (B), (C) and (D): (A) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction Ac having an ethylene content of 12-26% by weight and an intrinsic viscosity (measured at 135.degree. C. in decalin) of 6 dl/g or more, (B) a crystalline ethylene-propylene block copolymer containing a room-temperature-p-xylene-soluble fraction Bc having an ethylene content of 27-50% by weight and an intrinsic viscosity (measured at 135.degree. C. in decalin) of 4 dl/g or less, (C) an ethylene-.alpha.-olefin copolymer obtained by polymerization using a single-site catalyst, having a molecular weight distribution (Mw/Mn) of 2.5 or less, a melt flow ratio (MI.sub.10 /MI.sub.2.16) of 6-15 (wherein MI.sub.10 is a melt index measured at 190.degree. C. under a load of 10 kg and MI.sub.2.16 is a melt index measured at 190.degree. C. under a load of 2.16 kg) and an .alpha.Type: GrantFiled: November 29, 1996Date of Patent: November 17, 1998Assignees: UBE Industries, Ltd., Toyota Jidosha Kabushiki KaishaInventors: Tomohiko Akagawa, Ikunori Sakai, Saburo Hinenoya, Kaoru Inoue, Takao Nomura, Takeyoshi Nishio
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Patent number: 5750612Abstract: Disclosed is a polypropylene resin composition for car interior fittings, comprising (a) a crystalline polypropylene, (b) particular hydrogenated block copolymer(s), (c) particular hydrogenated block copolymer(s) different from (b), and (d) a particular talc.Type: GrantFiled: February 18, 1997Date of Patent: May 12, 1998Assignees: Toyota Jidosha Kabushiki Kaisha, Ube Industries, Ltd.Inventors: Yasutoshi Zyagawa, Takeyoshi Nishio, Takao Nomura, Tomohiko Akagawa, Ikunori Sakai, Saburou Hinenoya
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Patent number: 5744535Abstract: A polypropylene resin composition having a high moldability and capable of forming therefrom shaped articles having excellent surface hardness, thermal deformation resistance and low temperature impact resistance includes (A) 35-74 wt % of a crystalline ethylene-propylene block copolymer with an ethylene content of 0.5-15 wt %, an isotactic pentad fractional propylene of 96% or more and a MFR of 40-80 g/10 min. (230.degree. C., 2160 g); (B) 21-40 wt % of an ethylene-.alpha.-olefin copolymer produced by using a single site catalyst and having an .alpha.-olefin content of 70 mol % or more, a ratio (Mw/Mn) of 2.5 or less, and a ratio (MI.sub.10 /MI.sub.2.16) of 6 to 15; and (C) 5-25 wt % of a talc particle component having an average particle size of 3-7 .mu.m.Type: GrantFiled: October 8, 1996Date of Patent: April 28, 1998Assignee: UBE Industries, Ltd.Inventors: Tomohiko Akagawa, Ikunori Sakai, Shigehiro Asano
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Patent number: 5543454Abstract: A reinforced polypropylene resin composition contains the following components (A), (B) and (C) in amounts of 67 to 82% by weight of, 6 to 12% by weight and 12 to 21% by weight, respectively:Component (A): crystalline ethylene-propylene block copolymer having an ethylene content of 2 to 4% by weight, a molecular distribution of polypropylene component (Q=M.sub.w /M.sub.n) of at least 7, isotacticity of polypropylene component of at least 98%, an intrinsic viscosity (decalin, 135.degree. C.) of room temperature p-xylene soluble content of at least 6 dl/g, a melt flow rate (MFR) of 3 to 15 g/10 minutes, and the product of flexural modulus at room temperature and Izod impact strength at room temperature of at least 120000.Type: GrantFiled: August 4, 1994Date of Patent: August 6, 1996Assignees: Ube industries, Ltd., Kansei Corp.Inventors: Hikoichi Kamakura, Kiyoshi Tsutsui, Tomohiko Akagawa, Ikunori Sakai, Shigeji Ichikawa, Katsunori Arai
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Patent number: 5308908Abstract: A polypropylene resin composition comprising:(A) 45 to 70% by weight of an ethylene-propylene block copolymer synthesized under the process comprising the steps of;(a) polymerizing propylene with a Ziegler-Natta catalyst to obtain a highly crystalline polypropylene that contain not less than 97% by weight of a fraction insoluble in boiling n-heptane, and(b) copolymerizing ethylene with the polypropylene (a), and which(a) contains 0.5 to 10% by weight of ethylene,(b) contains 5 to 20% by weight of a fraction being soluble in p-xylene at room temperature and having an intrinsic viscosity value of not less than 2 (measured in decalin at 135.degree. C.),(c) has a melt-flow index value of 30 to 100 g/10 min., and,(d) has a value of flexural modulus of not less than 18,000 kg/cm.sup.2,(B) 10 to 20% by weight of an amorphous ethylene-propylene copolymer having(a) an ethylene content of 70 to 90% by weight,(b) a Mooney viscosity value (ML.sub.1+4 at 100.degree. C.) of 5 to 70,(C) 5 to 15% by weight of an ethylene-.Type: GrantFiled: August 28, 1992Date of Patent: May 3, 1994Assignee: Ube Industries, Ltd.Inventors: Osamu Fukui, Kouhei Ueno, Yoshifumi Nakano, Ikunori Sakai, Takao Nomura, Takeyoshi Nishio, Hisayuki Iwai
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Patent number: 5206284Abstract: A polypropylene thermoplastic resin composition comprising (a) a modified crystalline polypropylene of a crystalline polypropylene comprising said modified crystalline polypropylene and (b) a modified polyamide obtained by partially or wholly grafting a polyamide with a clay mineral. A polypropylene thermoplastic resin composition comprising, in addition to the above polypropylene thermoplastic resin composition comprising the components (a) and (b), one or any combination of the following components (c), (d) and (e): (c) an ethylene-.alpha.-olefin copolymer rubber or a modified ethylene-.alpha.-olefin copolymer rubber, (d) a block copolymer between a monovinyl-substituted aromatic hydrocarbon and a conjugated diene, a hydrogenation product of said block copolymer, or a modification product of said block copolymer, and (e) an inorganic filler.Type: GrantFiled: July 11, 1991Date of Patent: April 27, 1993Assignees: Ube Industries Ltd., Toyota Jidosha Kabushiki KaishaInventors: Osamu Fukui, Kiyoshi Tsutsui, Tomohiko Akagawa, Ikunori Sakai, Takao Nomura, Takeyoshi Nishio, Toshio Yokoi, Nobuya Kawamura
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Patent number: 5091462Abstract: A polypropylene thermoplastic resin composition comprising (a) a modified crystalline polypropylene of a crystalline polypropylene comprising said modified crystalline polypropylene and (b) a modified polyamide obtained by partially or wholly grafting a polyamide with a clay mineral. A polypropylene thermoplastic resin composition comprising, in addition to the above polypropylene thermoplastic resin composition comprising the components (a) and (b), one or any combination of the following components (c), (d) and (e): (c) an ethylene-.alpha.-olefin copolymer rubber or a modified ethylene-.alpha.-olefin copolymer rubber, (d) a block copolymer between a monovinyl-substituted aromatic hydrocarbon and a conjugated diene, a hydrogenation product of said block copolymer, or a modification product of said block copolymer, and (e) an inorganic filler.Type: GrantFiled: March 14, 1990Date of Patent: February 25, 1992Assignees: Ube Industries Limited, Toyota Jidosha Kabushiki KaishaInventors: Osamu Fukui, Kiyoshi Tsutsui, Tomohiko Akagawa, Ikunori Sakai, Takao Nomura, Takeyoshi Nishio, Toshio Yokoi, Nobuya Kawamura
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Patent number: 4988764Abstract: The polypropylene resin composition of the present invention can be obtained by melt mixing:(a) a modified polypropylene obtained by grafting a crystalline propylene-ethylene block copolymer with an unsaturated carboxylic acid, or a crystalline polypropylene containing the modified polypropylene,(b) a polyamide, and(c) a modified ethylene-.alpha.-olefin copolymer rubber obtained by grafting an ethylene-.alpha.olefin copolymer rubber with an unsaturated carboxylic acid. This composition is superior in low temperature impact resistance, rigidity, heat resistance and oil resistance.Type: GrantFiled: March 27, 1990Date of Patent: January 29, 1991Assignee: Toyota Jidosha Kabushiki KaishaInventors: Takeyoshi Nishio, Toshio Yokoi, Takao Nomura, Kouhei Ueno, Tomohiko Akagawa, Ikunori Sakai, Yasufumi Takasaki