Patents by Inventor Tomonori Nakashima
Tomonori Nakashima 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: 11365331Abstract: A latex of a highly saturated nitrile rubber wherein the highly saturated nitrile rubber contains ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt %, has an iodine value of 120 or less, and has a weight average molecular weight of solubles in chloroform of 100,000 or less, and when removing volatiles contained in the latex and making a film of the highly saturated nitrile rubber, a loss tangent tan ?(50° C.) at 50° C. of the film is 0.3 to 0.6 and a complex torque S* at the time of 100% shear strain at 100° C. of the film is 20 dNm or less, and an adhesive composition containing the latex are provided.Type: GrantFiled: September 1, 2020Date of Patent: June 21, 2022Assignee: ZEON CORPORATIONInventors: Tomonori Nakashima, Osamu Senda
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Patent number: 11072696Abstract: A rubber composition including a nitrile group-containing copolymer rubber with an iodine value smaller than or equal to 120; short fibers with an average fiber length smaller than or equal to 12 mm; and an organophosphorus compound, wherein a glass transition temperature difference ?Tg of the nitrile group-containing copolymer rubber is lower than or equal to 10° C.Type: GrantFiled: March 28, 2018Date of Patent: July 27, 2021Assignee: ZEON CORPORATIONInventor: Tomonori Nakashima
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Patent number: 10988609Abstract: A nitrile group-containing highly saturated copolymer rubber composition containing a nitrile group-containing highly saturated copolymer rubber (A) having a Mooney viscosity [ML1+4, 100° C.] of 50 to 200, a nitrile group-containing highly saturated copolymer rubber (B) having a Mooney viscosity [ML1+4, 100° C.] of 5 to 45, and staple fibers (C) having an average fiber length of 0.1 to 12 mm is provided. According to the present invention, a nitrile group-containing highly saturated copolymer rubber composition which can give cross-linked rubber which is extremely high in tensile stress and is excellent in low heat buildup property and has good workability can be provided.Type: GrantFiled: May 6, 2019Date of Patent: April 27, 2021Assignee: ZEON CORPORATIONInventors: Tomonori Nakashima, Chikara Katano, Masato Sakamoto
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Publication number: 20210002522Abstract: A latex of a highly saturated nitrile rubber wherein the highly saturated nitrile rubber contains ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt %, has an iodine value of 120 or less, and has a weight average molecular weight of solubles in chloroform of 100,000 or less, and when removing volatiles contained in the latex and making a film of the highly saturated nitrile rubber, a loss tangent tan ?(50° C.) at 50° C. of the film is 0.3 to 0.6 and a complex torque S* at the time of 100% shear strain at 100° C. of the film is 20 dNm or less, and an adhesive composition containing the latex are provided.Type: ApplicationFiled: September 1, 2020Publication date: January 7, 2021Applicant: ZEON CORPORATIONInventors: Tomonori NAKASHIMA, Osamu SENDA
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Publication number: 20200024429Abstract: A rubber composition including a nitrile group-containing copolymer rubber with an iodine value smaller than or equal to 120; short fibers with an average fiber length smaller than or equal to 12 mm; and an organophosphorus compound, wherein a glass transition temperature difference ?Tg of the nitrile group-containing copolymer rubber is lower than or equal to 10° C.Type: ApplicationFiled: March 28, 2018Publication date: January 23, 2020Applicant: ZEON CORPORATIONInventor: Tomonori NAKASHIMA
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Patent number: 10442918Abstract: A nitrile group-containing highly saturated copolymer rubber composition includes a nitrile group-containing highly saturated copolymer rubber (A) having ?,?-ethylenically unsaturated nitrile monomer units and (meth)acrylic acid ester monomer units and having an iodine value of 120 or less and a polyether ester-based plasticizer (B) having structural unit made of three or more ether compounds which are successively bonded. A nitrile group-containing highly saturated copolymer rubber composition excellent in vulcanization speed and giving cross-linked rubber has excellent heat resistance and cold resistance.Type: GrantFiled: November 26, 2014Date of Patent: October 15, 2019Assignee: ZEON CORPORATIONInventors: Sayaka Inoue, Tomonori Nakashima
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Patent number: 10428208Abstract: A cross-linkable nitrile rubber composition including a highly saturated nitrile rubber (A) containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less, a master batch (B) containing an ethylene-vinyl acetate copolymer (b1) having a melt flow rate measured under a load of 21.18N at 190° C. of 0.5 to 1000 g/10 min. and containing vinyl acetate monomer units in a ratio of 5 to 50 wt % and an organic staple fiber (b2) having an average fiber length of 0.1 to 12 mm, and a cross-linking agent (C), wherein a ratio of the ethylene-vinyl acetate copolymer (b1) and the organic staple fiber (b2) in the master batch (B) is, in terms of a weight ratio of “ethylene-vinyl acetate copolymer (b1):organic staple fiber (b2)”, 30:70 to 80:20 is provided.Type: GrantFiled: August 19, 2015Date of Patent: October 1, 2019Assignee: ZEON CORPORATIONInventor: Tomonori Nakashima
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Publication number: 20190284386Abstract: A nitrile group-containing highly saturated copolymer rubber composition containing a nitrile group-containing highly saturated copolymer rubber (A) having a Mooney viscosity [ML1+4, 100° C.] of 50 to 200, a nitrile group-containing highly saturated copolymer rubber (B) having a Mooney viscosity [ML1+4, 100° C.] of 5 to 45, and staple fibers (C) having an average fiber length of 0.1 to 12 mm is provided. According to the present invention, a nitrile group-containing highly saturated copolymer rubber composition which can give cross-linked rubber which is extremely high in tensile stress and is excellent in low heat buildup property and has good workability can be provided.Type: ApplicationFiled: May 6, 2019Publication date: September 19, 2019Applicant: ZEON CORPORATIONInventors: Tomonori NAKASHIMA, Chikara KATANO, Masato SAKAMOTO
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Patent number: 10414908Abstract: A dip-molding composition of the present invention contains a latex (A) of a nitrile-group-containing highly saturated copolymer rubber (a). The nitrile-group-containing highly saturated copolymer rubber (a) contains an ?,?-ethylenically unsaturated nitrile monomer unit and a conjugated diene monomer unit, and being obtained by hydrogenating at least part of the conjugated diene monomer unit. A dip-molded article of the present invention is produced by dip molding of the above dip-molding composition.Type: GrantFiled: March 24, 2015Date of Patent: September 17, 2019Assignee: ZEON CORPORATIONInventors: Tomonori Nakashima, Hiroyasu Nagamori, Sayaka Inoue
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Patent number: 10336918Abstract: An adhesive composition containing a latex of a highly saturated nitrile rubber (A) which has ?,?-ethylenically unsaturated nitrile monomer units 10 to 55 wt %, conjugated diene monomer units 25 to 89 wt %, and ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units 1 to 20 wt % and has an iodine value of 120 or less and a polyvalent amine compound (B).Type: GrantFiled: August 28, 2013Date of Patent: July 2, 2019Assignee: ZEON CORPORATIONInventors: Masato Sakamoto, Tomonori Nakashima
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Patent number: 10308793Abstract: A nitrile rubber composition comprising a highly saturated nitrile rubber (A) containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 8 to 60 wt % and having an iodine value of 120 or less and an alkylated phenol compound (B), wherein a ratio of content of the alkylated phenol compound (B) with respect to a total of the highly saturated nitrile rubber (A) and the alkylated phenol compound (B) is 0.01 to 1 wt %, and a difference (?2??1) between a plasticity number ?2 after storage at 70° C. for 7 days in a state of an aqueous dispersion by being dispersed in water and a plasticity number ?1 before the storage is 12 or less is provided.Type: GrantFiled: November 20, 2015Date of Patent: June 4, 2019Assignee: ZEON CORPORATIONInventors: Sayaka Inoue, Tomonori Nakashima
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Patent number: 10280298Abstract: A highly saturated nitrile rubber composition containing a carboxyl group-containing highly saturated nitrile rubber (A1) which contains ?,?-ethylenically unsaturated nitrile monomer units 15 to 60 wt % and ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units 1 to 60 wt % and has an iodine value of 120 or less, a highly saturated nitrile rubber (A2) which contains ?,?-ethylenically unsaturated nitrile monomer units 15 to 60 wt %, has a content of the ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and has an iodine value of 120 or less, and a polyamide resin (B), a content ratio of the carboxyl group-containing highly saturated nitrile rubber (A1) and the highly saturated nitrile rubber (A2) being a weight ratio of “carboxyl group-containing highly saturated nitrile rubber (A1):highly saturated nitrile rubber (A2)” of 2:98 to 98:2, is provided.Type: GrantFiled: March 29, 2012Date of Patent: May 7, 2019Assignee: ZEON CORPORATIONInventors: Tomonori Nakashima, Masato Sakamoto
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Patent number: 10266682Abstract: A rubber obtained by cross-linking a highly saturated nitrile rubber composition has a carboxyl group-containing highly saturated nitrile rubber (A1) containing 15 to 60 wt % of ?,?-ethylenically unsaturated nitrile monomer units and 1 to 60 wt % of ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units and having an iodine value ?120, a highly saturated nitrile rubber (A2) containing ?,?-ethylenically unsaturated nitrile monomer units in 15 to 60 wt %, having a content of ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer units of 0.9 wt % or less, and an iodine value of 120 or less, a polyamide resin having a melting point ?150° C., and a cross-linking agent. In the composition, a weight ratio of “(A1):(A2)” is 5:95 to 95:5 in range, a weight ratio of “total of (A1) and (A2):polyamide resin” is 95:5 to 50:50, and a storage elastic modulus of the cross-linked rubber at 150° C. is 5 MPa or more.Type: GrantFiled: June 23, 2015Date of Patent: April 23, 2019Assignee: ZEON CORPORATIONInventor: Tomonori Nakashima
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Publication number: 20190016889Abstract: A method for producing a thermoplastic elastomer composition, the method including the step of dynamically cross-linking a highly saturated nitrile rubber in the presence of a polyamide-based polymer and a polyamine cross-linking agent. The highly saturated nitrile rubber contains an ?,?-ethylenically unsaturated nitrile monomer unit and an ?,?-ethylenically unsaturated dicarboxylic acid monoester monomer unit and has an iodine value of 120 or less.Type: ApplicationFiled: January 10, 2017Publication date: January 17, 2019Applicant: ZEON CORPORATIONInventor: Tomonori NAKASHIMA
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Patent number: 10059835Abstract: A cross-linkable nitrile rubber composition including a highly saturated nitrile rubber (A) containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 5 to 50 wt % and having an iodine value of 120 or less, a polysaccharide polymer staple fiber (B) having an average fiber diameter of 1 ?m or less, and a cross-linking agent (C), wherein a ratio of content of the polysaccharide polymer staple fiber (B) is 0.5 to 30 parts by weight with respect to 100 parts by weight of the highly saturated nitrile rubber (A).Type: GrantFiled: August 26, 2015Date of Patent: August 28, 2018Assignee: ZEON CORPORATIONInventor: Tomonori Nakashima
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Patent number: 10000868Abstract: Provided are a reinforcing cord using a reinforcing fiber treating agent for improving the performance, particularly oil resistance, of rubber products, and a highly oil-resistant rubber product. By using a reinforcing fiber treating agent that has an ?,?-ethylenically unsaturated nitrile monomer unit content of 30-55 wt %, an acid group-containing ?,?-ethylenically unsaturated monomer unit content of 3-20 wt %, an iodine value of 120 or less and a tetrahydrofuran insoluble fraction of 30 wt % or more, the oil resistance of the reinforcing cord and thus the oil resistance of rubber products using the reinforcing cord are improved.Type: GrantFiled: January 20, 2012Date of Patent: June 19, 2018Assignees: Zeon Corporation, Nippon Sheet Glass Company, LimitedInventors: Osamu Senda, Tomonori Nakashima
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Patent number: 9969886Abstract: A latex for friction member use including rubber particles comprised of a carboxyl group-containing highly saturated nitrile rubber containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less, wherein a difference ?d (?d=d90?d50) between a volume cumulative 90% particle size (d90) of the rubber particles and volume cumulative 50% particle size (d50) of the rubber particles which are measured by a light scattering method is 0.0240 ?m or more is provided.Type: GrantFiled: December 18, 2015Date of Patent: May 15, 2018Assignee: ZEON CORPORATIONInventors: Sayaka Inoue, Tomonori Nakashima
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Publication number: 20170355854Abstract: A latex for friction member use including rubber particles comprised of a carboxyl group-containing highly saturated nitrile rubber containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less, wherein a difference ?d (?d=d90?d50) between a volume cumulative 90% particle size (d90) of the rubber particles and volume cumulative 50% particle size (d50) of the rubber particles which are measured by a light scattering method is 0.0240 ?m or more is provided.Type: ApplicationFiled: December 18, 2015Publication date: December 14, 2017Applicant: ZEON CORPORATIONInventors: Sayaka INOUE, Tomonori NAKASHIMA
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Publication number: 20170327672Abstract: A nitrile rubber composition comprising a highly saturated nitrile rubber (A) containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 8 to 60 wt % and having an iodine value of 120 or less and an alkylated phenol compound (B), wherein a ratio of content of the alkylated phenol compound (B) with respect to a total of the highly saturated nitrile rubber (A) and the alkylated phenol compound (B) is 0.01 to 1 wt %, and a difference (?2??1) between a plasticity number ?2 after storage at 70° C. for 7 days in a state of an aqueous dispersion by being dispersed in water and a plasticity number ?1 before the storage is 12 or less is provided.Type: ApplicationFiled: November 20, 2015Publication date: November 16, 2017Applicant: ZEON CORPORATIONInventors: Sayaka INOUE, Tomonori NAKASHIMA
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Publication number: 20170267844Abstract: A cross-linkable nitrile rubber composition including a highly saturated nitrile rubber (A) containing ?,?-ethylenically unsaturated nitrile monomer units in a ratio of 10 to 60 wt % and having an iodine value of 120 or less, a master batch (B) containing an ethylene-vinyl acetate copolymer (b1) having a melt flow rate measured under a load of 21.18N at 190° C. of 0.5 to 1000 g/10 min. and containing vinyl acetate monomer units in a ratio of 5 to 50 wt % and an organic staple fiber (b2) having an average fiber length of 0.1 to 12 mm, and a cross-linking agent (C), wherein a ratio of the ethylene-vinyl acetate copolymer (b1) and the organic staple fiber (b2) in the master batch (B) is, in terms of a weight ratio of “ethylene-vinyl acetate copolymer (b1):organic staple fiber (b2)”, 30:70 to 80:20 is provided.Type: ApplicationFiled: August 19, 2015Publication date: September 21, 2017Applicant: ZEON CORPORATIONInventor: Tomonori NAKASHIMA