Patents by Inventor Masashi Aoshima
Masashi Aoshima 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: 5597860Abstract: The present invention provides a vulcanizable rubber composition comprising 100 parts by weight of a polymer component consisting of 30 to 80 wt. % of an ethylene.cndot..alpha.-olefin.cndot.non-conjugated diene copolymer having a Mooney viscosity of 10 to 100 (ML.sub.1+4 100.degree. C.) and an iodine value of 20 to 45 and containing ethylene and .alpha.-olefin in a weight ratio of 50:50 to 90:10, and 20 to 70 wt. % of a styrene-conjugated diolefin block copolymer, 20 to 150 parts by weight of a reinforcing filler, 3 to 30 parts by weight of sulfur, 0 to 50 parts by weight of a styrene resin and 0 to 100 parts by weight of an extending oil.Type: GrantFiled: July 21, 1995Date of Patent: January 28, 1997Assignees: Sumitomo Chemical Company Limited, Toyoda Gosei Co., Ltd.Inventors: Masashi Aoshima, Hironobu Shigematsu, Takeru Wadaki, Toshikatsu Kanehara, Kazuya Watanabe, Toshiyuki Tanaka
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Patent number: 5543470Abstract: The present invention provides a vulcanized rubber for a heat resistant vibration-isolator which can be obtained by vulcanizing a composition comprising:(A) 110-175 parts by weight of an oil-extended copolymer comprising 100 parts by weight of an ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber with intrinsic viscosity [.eta.] of 3 dl/g or more and 10-75 parts by weight of an extender oil;(B) 5-20 parts by weight of a liquid diene polymer with melt viscosity of 100-3000 poise at 25.degree. C., per 100 parts by weight of an ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber; and(C) 10-80 parts by weight of a reinforcing filler, per 100 parts by weight of an ethylene-.alpha.-olefin-non-conjugated diene copolymer rubber; with an organic peroxide.The vulcanized rubbers of the present invention have excellent thermal stability and durability, a low dynamic spring constant, and excellent processability.Type: GrantFiled: December 7, 1994Date of Patent: August 6, 1996Assignee: Sumitomo Chemical Company, LimitedInventors: Hiroki Nakata, Mitsuhiko Sato, Masashi Aoshima
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Patent number: 5496863Abstract: A method of crosslinking a rubber or plastic molding is described, which comprises irradiating the molding with electron beams to thereby limitedly crosslink only the surface of the molding. The molding thus-treated has excellent shape-sustaining properties and good surface appearance. Thus it is expected to find many applications in various fields.Type: GrantFiled: March 12, 1991Date of Patent: March 5, 1996Assignee: Sumitomo Chemical Company, Ltd.Inventors: Yoshihiko Kitagawa, Tadashi Jinno, Masashi Aoshima, Taisuke Okita, Hideo Shinonaga, Kaoru Kitadono
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Patent number: 5300579Abstract: A vulcanizable rubber composition comprising an ethylene-.alpha.-olefin copolymer modified with an alkenyl aromatic compound alone or in combination with at least one other polymerizable compound, as a polymer component. The vulcanizable rubber composition is excellent in weather-resistance, ozone-resistance and heat-resistance and has a high strength, a high rigidity and a high hardness.Type: GrantFiled: April 14, 1992Date of Patent: April 5, 1994Assignee: Sumitomo Chemical Company, LimitedInventors: Masashi Aoshima, Hironobu Shigematsu, Takeru Wadaki, Mitsuji Tsuji
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Patent number: 5246990Abstract: A cured ethylene.multidot..alpha.-olefin copolymer-based rubber composition excellent in weathering resistance property is produced by curing with an organic peroxide an uncured rubber composition comprising 100 parts by weight of an ethylene .multidot..alpha.-olefin copolymer-based rubber, 1 to 10 parts by weight of a hindered amine-based weathering agent, 0.01 to 10 parts by weight of a phenol-based antioxidant, 0.01 to 10 parts by weight of a sulfur-based antioxidant, 0.01 to 10 parts by weight of a phosphite ester-based antioxidant, and 1 to 10 parts by weight of a benzotriazole-based ultraviolet absorber.Type: GrantFiled: November 15, 1991Date of Patent: September 21, 1993Assignee: Sumitomo Chemical Company, LimitedInventors: Masashi Aoshima, Hironobu Shigematsu, Takeru Wadaki
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Patent number: 5213723Abstract: A process for producing a rubber product by vulcanizing a molded article composed of a rubber composition containing a peroxide as a crosslinking agent in the presence of oxygen, wherein said molded article is irradiated with electron beams, is disclosed. The rubber article produced by the invention is not sticky on the surface and exhibits excellent tensile properties.Type: GrantFiled: July 19, 1991Date of Patent: May 25, 1993Assignee: Sumitomo Chemical Co., Ltd.Inventors: Masashi Aoshima, Tadashi Jinno
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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
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Patent number: 5071886Abstract: A heat-shrinkable, tubular foam can be produced from a composition which comprises 100 parts by weight of an ethylene-.alpha.-olefin-nonconjugated diene copolymer, 1 to 20 parts by weight of a foaming agent, 5 to 100 parts by weight of a thermoplastic resin having a Vicat softening point of 50.degree. to 200.degree. C., and up to 10 parts by weight of a crosslinking agent, by shaping the composition into a tube, crosslinking and foaming the tube and pressurizing the tube in the interior to inflate it. This heat-shrinkable, tubular foam is best suited for jacketing pipes, hoses, and the like.Type: GrantFiled: July 6, 1989Date of Patent: December 10, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Masashi Aoshima, Tadashi Jinno, Naohiro Yoshida
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Patent number: 5043115Abstract: A heat-shrinkable, tubular foam can be produced from a composition which comprises 100 parts by weight of an ethylene-.alpha.-olefin-nonconjugated diene copolymer, 1 to 20 parts by weight of a foaming agent, 5 to 100 parts by weight of a thermoplastic resin having a vicat softening point of 50.degree. to 200.degree. C., and up to 10 parts by weight of a crosslinking agent, by shaping the composition into a tube, crosslinking and foaming the tube and pressurizing the tube in the interior to inflate it. This heat-shrinkable, tubular foam is best suited for jacketing pipes, hoses, and the like.Type: GrantFiled: January 28, 1991Date of Patent: August 27, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Masashi Aoshima, Tadashi Jinno, Naohiro Yoshida
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Patent number: 4983685Abstract: In a process of crosslinking a rubber compound with the usage of an organic peroxide as the crosslinking agent, is incorporated to the rubber compound in an amount of 0.5-20 parts by weight per 100 parts of a rubber substrate a compound selected from imidazole type compounds, thiourea type compounds, thiazole type compounds, thiuram type compounds, dithiocarbamate type compounds, phenol type compounds, triazole type compounds and amine type compounds. The process results no surface tackiness of the rubber product crosslinked in the presence of oxygen.Type: GrantFiled: June 4, 1987Date of Patent: January 8, 1991Assignee: Sumitomo Chemical Company, LimitedInventors: Masashi Aoshima, Hironobu Shigematu, Mitsuhiko Sato
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Patent number: 4966940Abstract: A vulcanized, ethylene/.alpha.-olefin copolymer rubber composition obtained by vulcanizing an unvulcanized rubber composition comprising 100 parts by weight of a rubber composition consisting of 0-99% by weight of an ethylene/.alpha.-olefin copolymer rubber and 100-1% by weight of an ethylene/.alpha.-olefin copolymer rubber containing an .alpha.,.beta.-unsaturated carboxylic acid and/or a derivative thereof; and 5-100 parts by weight of a polyamide resin, wherein an ethylene/.alpha.-olefin copolymer rubber is at least one selected from ethylene/.alpha.-olefin copolymers and ethylene/.alpha.-olefin/non-conjugated diene copolymers. The vulcanized, ethylene/.alpha.-olefin copolymer rubber composition of the present invention has a high hardness and is excellent in weather resistance and thermal resistance as compared with natural rubbers and general-purpose rubbers.Type: GrantFiled: June 2, 1989Date of Patent: October 30, 1990Assignee: Sumitomo Chemical Company, LimitedInventors: Mitsuji Tsuji, Eiichi Usuda, Masashi Aoshima
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Patent number: 4431775Abstract: A process for vulcanizing a rubber base comprising at least one halogen-containing amorphous polymer at a low temperature ranging from 5.degree. to 85.degree. C., which comprises carrying out the vulcanization in the presence of 0.01 to 20 parts by weight of an organic hydroperoxide and/or ketone peroxide per 100 parts by weight of the rubber base.In the above process, at least one member selected from the group consisting of (I) the oxides of metals, such as zinc, lead, chromium, cobalt, nickel, magnesium, manganese, copper and iron, or the metallic salts of said metals with aliphatic or cycloaliphatic carboxylic acid having 8 to 24 carbon atoms; (II) methacrylic esters; (III) maleimides; and (IV) oximes, may be used as a vulcanization activator or a vulcanization accelerator in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the rubber base.Type: GrantFiled: September 23, 1981Date of Patent: February 14, 1984Assignee: Sumitomo Chemical Company, LimitedInventors: Isamu Maeda, Masashi Aoshima
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Patent number: 4310443Abstract: A process for vulcanizing a rubber base comprising at least one halogen-containing amorphous polymer at a low temperature ranging from 5.degree. to 85.degree. C., which comprises carrying out the vulcanization in the presence of 0.01 to 20 parts by weight of an organic hydroperoxide and/or ketone peroxide per 100 parts by weight of the rubber base.In the above process, at least one member selected from the group consisting of (I) the oxides of metals, such as zinc, lead, chromium, cobalt, nickel, magnesium, manganese, copper and iron, or the metallic salts of said metals with aliphatic or cycloaliphatic carboxylic acid having 8 to 24 carbon atoms; (II) methacrylic esters; (III) maleimides; and (IV) oximes, may be used as a vulcanization activator or a vulcanization accelerator in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the rubber base.Type: GrantFiled: September 19, 1980Date of Patent: January 12, 1982Assignee: Sumitomo Chemical Company, LimitedInventors: Isamu Maeda, Masashi Aoshima
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Patent number: 4248987Abstract: A process for vulcanizing a rubber base comprising at least one halogen-containing amorphous polymer at a low temperature ranging from 5.degree. to 85.degree. C., which comprises carrying out the vulcanization in the presence of 0.01 to 20 parts by weight of an organic hydroperoxide and/or ketone peroxide per 100 parts by weight of the rubber base.In the above process, at least one member selected from the group consisting of (I) the oxides of metals, such as zinc, lead, chromium, cobalt, nickel, magnesium, manganese, copper and iron, or the metallic salts of said metals with aliphatic or cycloaliphatic carboxylic acid having 8 to 24 carbon atoms; (II) methacrylic esters; (III) maleimides; and (IV) oximes, may be used as a vulcanization activator or a vulcanization accelerator in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the rubber base.Type: GrantFiled: April 26, 1979Date of Patent: February 3, 1981Assignee: Sumitomo Chemical Company, LimitedInventors: Isamu Maeda, Masashi Aoshima
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Patent number: 4166892Abstract: A process for vulcanizing a rubber base comprising at least one halogen-containing amorphous polymer at a low temperature ranging from 5.degree. to 85.degree. C., which comprises carrying out the vulcanization in the presence of 0.01 to 20 parts by weight of an organic hydroperoxide and/or ketone peroxide per 100 parts by weight of the rubber base.In the above process, at least one member selected from the group consisting of (I) the oxides of metals, such as zinc, lead, chromium, cobalt, nickel, magnesium, manganese, copper and iron, or the metallic salts of said metals with aliphatic or cycloaliphatic carboxylic acid having 8 to 24 carbon atoms; (II) methacrylic esters; (III) maleimides; and (IV) oximes, may be used as a vulcanization activator or a vulcanization accelerator in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the rubber base.Type: GrantFiled: July 12, 1977Date of Patent: September 4, 1979Assignee: Sumitomo Chemical Company, LimitedInventors: Isamu Maeda, Masashi Aoshima