Patents by Inventor Atsuhito KASHIMA
Atsuhito KASHIMA 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: 10011701Abstract: A fluorosilicone rubber composition is provided comprising (A) a fluorosilicone gum having an aliphatic unsaturated monovalent hydrocarbon group content of 0.03-1 mol % based on the total of monovalent hydrocarbon groups and a residual alkali metal content of up to 20 ppm, (B) reinforcing silica having a specific surface area of 50-100 m2/g, and (C) an organic peroxide catalyst. The composition is molded into silicone rubber parts which are improved in compression set even after immersion in ?-caprolactam.Type: GrantFiled: December 2, 2014Date of Patent: July 3, 2018Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Osamu Hayashida, Kazuhiro Oishi, Atsuhito Kashima
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Patent number: 9777157Abstract: A fluorosilicone rubber composition comprising (A) an alkenyl-rich fluorosilicone gum, (B) an alkenyl-poor fluorosilicone gum, (C) reinforcing silica, and (D) a curing catalyst cures into a product which experiences little change of physical strength even after immersion in alcohol-containing fuel oil.Type: GrantFiled: March 12, 2015Date of Patent: October 3, 2017Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Osamu Hayashida, Takao Uno, Kazuhiro Oishi, Atsuhito Kashima
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Publication number: 20160369143Abstract: The present invention relates to a silicone rubber composition comprising: (A) 100 parts by mass of an organopolysiloxane that has a degree of polymerization of 100 or more and contains at least two alkenyl groups each bound to a silicon atom in the molecule; (B) 10 to 100 parts by mass of a reinforcing silica having a specific surface area (BET method) of 50 m2/g or more; (C) 1 to 100 parts by mass of calcined mica having an average particle diameter of 20 ?m or less; and (D) an effective amount of a curing agent. According to the present invention, even when a silicone rubber molded article is exposed to flame for a long time, ash of the silicone rubber molded article after firing is sintered (is transformed into a ceramic material) and the shape of the silicone rubber molded article before the firing (sintering) can be maintained. In addition, the rolling properties (workability) in a kneading step in the production of the silicone rubber composition is excellent.Type: ApplicationFiled: May 21, 2014Publication date: December 22, 2016Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Osamu HAYASHIDA, Masakatsu HOTTA, Yoshiaki KOIKE, Atsuhito KASHIMA
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Patent number: 9458306Abstract: A fluorosilicone rubber composition is provided. This composition comprises (A) 100 parts by weight of a fluorosilicone rubber compound, (B) 0.1 to 10 parts by weight of an activated carbon at a pH of up to 9, and (C) a catalytic amount of a curing catalyst. The fluorosilicone rubber composition of the invention can be used in producing a fluorosilicone rubber molded article (cured article) which is less likely to experience loss of its physical properties when brought in contact with an amine antiaging agent. Such fluorosilicone rubber molded article is suitable for use in applications such as rubber parts used near cargo plane engines.Type: GrantFiled: September 10, 2015Date of Patent: October 4, 2016Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Osamu Hayashida, Atsuhito Kashima
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Publication number: 20150259532Abstract: A fluorosilicone rubber composition comprising (A) an alkenyl-rich fluorosilicone gum, (B) an alkenyl-poor fluorosilicone gum, (C) reinforcing silica, and (D) a curing catalyst cures into a product which experiences little change of physical strength even after immersion in alcohol-containing fuel oil.Type: ApplicationFiled: March 12, 2015Publication date: September 17, 2015Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Osamu HAYASHIDA, Takao UNO, Kazuhiro OISHI, Atsuhito KASHIMA
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Publication number: 20150166765Abstract: A fluorosilicone rubber composition is provided comprising (A) a fluorosilicone gum having an aliphatic unsaturated monovalent hydrocarbon group content of 0.03-1 mol % based on the total of monovalent hydrocarbon groups and a residual alkali metal content of up to 20 ppm, (B) reinforcing silica having a specific surface area of 50-100 m2/g, and (C) an organic peroxide catalyst. The composition is molded into silicone rubber parts which are improved in compression set even after immersion in ?-caprolactam.Type: ApplicationFiled: December 2, 2014Publication date: June 18, 2015Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Osamu HAYASHIDA, Kazuhiro Oishi, Atsuhito Kashima
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Patent number: 8530550Abstract: A crosslinkable rubber composition includes, as essential components: (A) an ethylene-?-olefin-nonconjugated polyene random copolymer rubber in which the nonconjugated polyene has a terminal vinyl group-containing norbornene compound represented by the following general formula (1) or (II), wherein n is an integer of 0 to 10, R1 is H or an alkyl group, and R2 is H or an alkyl group, wherein R3 is H or an alkyl group, and which has a viscosity of not less than 10 Pa·s and less than 1,000 Pa·s at 25° C. under a shear rate of 10 s?1; (B) an organopolysiloxane which has three repeating units of siloxane represented by the following formula and which has three Si-bonded hydrogen atoms per molecule, wherein R4 is a monovalent hydrocarbon group; (C) a reinforcing filler; (D) a curing catalyst; and (E) a curing reaction retarder.Type: GrantFiled: June 1, 2011Date of Patent: September 10, 2013Assignees: Mitsui Chemicals, Inc., Shin-Ets Chemical Co., Ltd.Inventors: Akira Sannomiya, Kenji Iida, Noriyuki Meguriya, Atsuhito Kashima
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Publication number: 20110301278Abstract: A crosslinkable rubber composition includes, as essential components: (A) an ethylene-?-olefin-nonconjugated polyene random copolymer rubber in which the nonconjugated polyene has a terminal vinyl group-containing norbornene compound represented by the following general formula (1) or (II), wherein n is an integer of 0 to 10, R1 is H or an alkyl group, and R2 is H or an alkyl group, wherein R3 is H or an alkyl group, and which has a viscosity of not less than 10 Pa·s and less than 1,000 Pa·s at 25° C. under a shear rate of 10 s?1; (B) an organopolysiloxane which has three repeating units of siloxane represented by the following formula and which has three Si-bonded hydrogen atoms per molecule, wherein R4 is a monovalent hydrocarbon group; (C) a reinforcing filler; (D) a curing catalyst; and (E) a curing reaction retarder.Type: ApplicationFiled: June 1, 2011Publication date: December 8, 2011Applicants: SHIN-ETSU CHEMICAL CO., LTD., MITSUI CHEMICALS, INC.Inventors: Akira SANNOMIYA, Kenji IIDA, Noriyuki MEGURIYA, Atsuhito KASHIMA