Patents by Inventor Tatsuo Sassa
Tatsuo Sassa 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: 8278404Abstract: There are provided (I) a process for producing a copolymer of ethylene, an ?-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those monomers in a polymerization reactor by feeding the following components (A), (B), (C1) and (D) to the polymerization reactor: (A) a transition metal complex, (B) an organic aluminum compound, (C1) a halogen-containing compound, and (D) a Lewis base, wherein those components are fed to the polymerization reactor without a preliminary contact of (1) the component (A) with the component (B), (2) the component (A) with the component (C1), (3) the component (B) with the component (C1), and (4) the component (B) with the component (D); and (II) a process for producing said copolymer, which comprises the step of copolymerizing those monomers in a polymerization reactor (i) by feeding to the polymerization reactor the components (A), (B), (D), (C2) a halogen-containing compound, which is a derivative of an aryl group-contaiType: GrantFiled: May 24, 2011Date of Patent: October 2, 2012Assignee: Sumitomo Chemical Company, LimitedInventors: Jun Kawashima, Katsunari Inagaki, Tatsuo Sassa
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Publication number: 20110224390Abstract: There are provided (I) a process for producing a copolymer of ethylene, an ?-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those monomers in a polymerization reactor by feeding the following components (A), (B), (C1) and (D) to the polymerization reactor: (A) a transition metal complex, (B) an organic aluminum compound, (C1) a halogen-containing compound, and (D) a Lewis base, wherein those components are fed to the polymerization reactor without a preliminary contact of (1) the component (A) with the component (B), (2) the component (A) with the component (C1), (3) the component (B) with the component (C1), and (4) the component (B) with the component (D); and (II) a process for producing said copolymer, which comprises the step of copolymerizing those monomers in a polymerization reactor (i) by feeding to the polymerization reactor the components (A), (B), (D), (C2) a halogen-containing compound, which is a derivative of an aryl group-contaiType: ApplicationFiled: May 24, 2011Publication date: September 15, 2011Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Jun KAWASHIMA, Katsunari INAGAKI, Tatsuo SASSA
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Patent number: 7838591Abstract: A process for producing a vulcanized molded article of a rubber composition, which comprises the steps of (1) kneading, at least, 100 parts by weight of a defined ethylene-?-olefin-non-conjugated polyene copolymer rubber (A), 1 to 150 parts by weight of a reinforcement (B), and 1 to 150 parts by weight of a softener (C), (2) mixing the resultant kneaded product with 0.1 to 10 parts by weight of a vulcanizing agent (D), and (3) hot forming the resultant rubber composition; and a vibration-proof material comprising a vulcanized molded article of a rubber composition produced by the above process.Type: GrantFiled: November 22, 2005Date of Patent: November 23, 2010Assignee: Sumitomo Chemical Company, LimitedInventors: Sadayuki Nakano, Tatsuo Sassa
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Patent number: 7262258Abstract: There are provided (I) a process for producing a copolymer of ethylene, an ?-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those monomers in a polymerization reactor by feeding the following components (A), (B), (C1) and (D) to the polymerization reactor: (A) a transition metal complex, (B) an organic aluminum compound, (C1) a halogen-containing compound, and (D) a Lewis base, wherein those components are fed to the polymerization reactor without a preliminary contact of (1) the component (A) with the component (B), (2) the component (A) with the component (C1), (3) the component (B) with the component (C1), and (4) the component (B) with the component (D); and (II) a process for producing said copolymer, which comprises the step of copolymerizing those monomers in a polymerization reactor (i) by feeding to the polymerization reactor the components (A), (B), (D), (C2) a halogen-containing compound, which is a derivative of an aryl group-contaiType: GrantFiled: July 8, 2004Date of Patent: August 28, 2007Assignee: Sumitomo Chemical Company, LimitedInventors: Jun Kawashima, Katsunari Inagaki, Tatsuo Sassa
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Publication number: 20070088139Abstract: There are provided (I) a process for producing a copolymer of ethylene, an ?-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those monomers in a polymerization reactor by feeding the following components (A), (B), (C1) and (D) to the polymerization reactor: (A) a transition metal complex, (B) an organic aluminum compound, (C1) a halogen-containing compound, and (D) a Lewis base, wherein those components are fed to the polymerization reactor without a preliminary contact of (1) the component (A) with the component (B), (2) the component (A) with the component (C1), (3) the component (B) with the component (C1), and (4) the component (B) with the component (D); and (II) a process for producing said copolymer, which comprises the step of copolymerizing those monomers in a polymerization reactor (i) by feeding to the polymerization reactor the components (A), (B), (D), (C2) a halogen-containing compound, which is a derivative of an aryl group-containingType: ApplicationFiled: November 22, 2006Publication date: April 19, 2007Inventors: Jun KAWASHIMA, Katsunari Inagaki, Tatsuo Sassa
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Publication number: 20060178492Abstract: A process for producing a vulcanized molded article of a rubber composition, which comprises the steps of (1) kneading, at least, 100 parts by weight of a defined ethylene-?-olefin-non-conjugated polyene copolymer rubber (A), 1 to 150 parts by weight of a reinforcement (B), and 1 to 150 parts by weight of a softener (C), (2) mixing the resultant kneaded product with 0.1 to 10 parts by weight of a vulcanizing agent (D), and (3) hot forming the resultant rubber composition; and a vibration-proof material comprising a vulcanized molded article of a rubber composition produced by the above process.Type: ApplicationFiled: November 22, 2005Publication date: August 10, 2006Inventors: Sadayuki Nakano, Tatsuo Sassa
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Patent number: 7005492Abstract: There is provided an ethylene-?-olefin-non-conjugated diene copolymer rubber satisfying the following requirements (1) to (4): (1) a ratio of a Z-average molecular chain length (Az) measured according to a gel permeation chromatography to a number average molecular chain length (An), Az/An, of the ethylene-?-olefin-non-conjugated diene copolymer rubber is from 20 to 30, (2) a ratio of a weight average molecular chain length (Aw), which is an index of a molecular weight distribution, to the number average molecular chain length (An), Aw/An, of the ethylene-?-olefin-non-conjugated diene copolymer rubber is more than 5, (3) a unimodal or bimodal molecular weight distribution structure having a molecular chain length component, which component is present in a maximum amount in a range of 3.8<Log Aw<4.5, exists in the ethylene-?-olefin-non-conjugated diene copolymer rubber, and (4) a viscosity (ML1+4, 121° C.Type: GrantFiled: November 26, 2003Date of Patent: February 28, 2006Assignee: Sumitomo Chemical Company, LimitedInventor: Tatsuo Sassa
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Publication number: 20050014914Abstract: There are provided (I) a process for producing a copolymer of ethylene, an ?-olefin having from 3 to 20 carbon atoms and optionally a polyene, which comprises the step of copolymerizing those monomers in a polymerization reactor by feeding the following components (A), (B), (C1) and (D) to the polymerization reactor: (A) a transition metal complex, (B) an organic aluminum compound, (C1) a halogen-containing compound, and (D) a Lewis base, wherein those components are fed to the polymerization reactor without a preliminary contact of (1) the component (A) with the component (B), (2) the component (A) with the component (C1), (3) the component (B) with the component (C1), and (4) the component (B) with the component (D); and (II) a process for producing said copolymer, which comprises the step of copolymerizing those monomers in a polymerization reactor (i) by feeding to the polymerization reactor the components (A), (B), (D), (C2) a halogen-containing compound, which is a derivative of an aryl group-containingType: ApplicationFiled: July 8, 2004Publication date: January 20, 2005Inventors: Jun Kawashima, Katsunari Inagaki, Tatsuo Sassa
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Publication number: 20040242782Abstract: A rubber composition comprising the following components (A), (B1) or (B2), and (C):Type: ApplicationFiled: May 25, 2004Publication date: December 2, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Sadayuki Nakano, Tatsuo Sassa, Jun Kawashima
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Publication number: 20040106760Abstract: There is provided an ethylene-&agr;-olefin-non-conjugated diene copolymer rubber satisfying the following requirements (1) to (4):Type: ApplicationFiled: November 26, 2003Publication date: June 3, 2004Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Tatsuo Sassa
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Patent number: 6455604Abstract: There is provided a process for producing a foamed rubber comprising a step of foaming a rubber composition, which composition comprises: (A) 100 parts by weight of an ethylene-&agr;-olefin copolymer rubber, (B) 10 to 100 parts by weight of mica, and (C) 2 to 10 parts by weight of a foaming agent.Type: GrantFiled: August 29, 2001Date of Patent: September 24, 2002Assignee: Sumitomo Chemical Company, LimitedInventor: Tatsuo Sassa
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Patent number: 6391974Abstract: A pressure-sensitive adhesive comprising an olefin-based copolymer wherein (1) the olefin-based copolymer has a tensile strength at break measured according to JIS K 6251 of 2.0 MPa or less, and (2) the elongation at break EB(%) of a resin composition obtained in blending the olefin-based copolymer with a polypropylene-based resin having a 20° C. xylene-soluble component content of 20 wt % or less satisfies the following formula 1: S[2/6]≧−800, wherein S[2/6] represents the gradient of a primary straight line, and Pa represents the weight content proportion of the olefin-based copolymer contained in the resin composition.Type: GrantFiled: September 8, 2000Date of Patent: May 21, 2002Assignee: Sumitomo Chemical Co., Ltd.Inventors: Atsuko Ogawa, Tatsuo Sassa, Hirofumi Jyouhouji, Hidetake Hozumi
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Publication number: 20020055547Abstract: There is provided a process for producing a foamed rubber comprising a step of foaming a rubber composition, which composition comprises:Type: ApplicationFiled: August 29, 2001Publication date: May 9, 2002Applicant: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Tatsuo Sassa
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Publication number: 20010021449Abstract: A foamed rubber obtainable by a process including the steps of:Type: ApplicationFiled: February 12, 2001Publication date: September 13, 2001Inventors: Junichi Koshiba, Tatsuo Sassa
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Patent number: 5130182Abstract: A fusion bonded waterproof sheet having a first ethylene-.alpha.-olefin rubber layer which has a high crosslinking rate and is changed to a crosslinked layer and a second ethylene-.alpha.-olefin rubber layer which has a low crosslinking rate and is changed to a partially crosslinked layer, the crosslinking of both sheets being carried after compositing and integrating them, which sheet has good fusion bondability and good bond strength at high temperature.Type: GrantFiled: September 6, 1991Date of Patent: July 14, 1992Assignee: Sumitomo Chemical Co., Ltd.Inventors: Masashi Aoshima, Hironobu Shigematsu, Tatsuo Sassa