Patents by Inventor Shigeki Shudo
Shigeki Shudo 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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Publication number: 20210355285Abstract: An addition-curable liquid silicone rubber composition for LED headlamps, which contains: (A) (A-1) an alkenyl group-containing liquid organopolysiloxane, and (A-2) an alkenyl group-containing raw rubber-state organopolysiloxane; (B) a silicone resin which contains an alkenyl group, while being composed of a unit that is selected from among an R23SiO1/2 unit (M unit), an SiO4/2 unit (Q unit), an R22SiO2/2 unit (D unit) and R2SiO3/2 unit (T unit); (C) an organohydrogen polysiloxane; (D) a platinum group metal catalyst; and (E) triallyl isocyanurate.Type: ApplicationFiled: September 19, 2019Publication date: November 18, 2021Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Shigeki SHUDO, Mikio IINO
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Patent number: 10927256Abstract: The present invention provides a transparent liquid silicone rubber composition that does not contain an inorganic filler and includes the following as main components: (A) a silicone resin having, as essential structural units, an R3SiO1/2 unit (M unit) and a SiO4/2 unit (Q unit) (R is a monovalent hydrocarbon group containing 1-6 carbon atoms, and at least 2 R's in a molecule are alkenyl groups); (B) a straight-chain or branched organopolysiloxane containing, in a molecule, 2 or more alkenyl groups bonded to silicon atoms; (C) an organohydrogenpolysiloxane containing, in a molecule, 2 or more hydrogen atoms bonded to silicon atoms; (D) an organopolysiloxane which is liquid at room temperature, having a weight-average molecular weight of 37,000 or less and containing, in a molecule, one or more hydroxyl groups bonded to silicon atoms; and (E) a hydrosilylation reaction catalyst.Type: GrantFiled: July 20, 2017Date of Patent: February 23, 2021Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Hironobu Muramatsu, Shigeki Shudo
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Patent number: 10851242Abstract: An addition-curable silicone rubber composition which contains: 100 parts by weight of (A) an organopolysiloxane that is represented by average composition formula (1) R1aSiO(4?a)/2 (wherein R1 represent monovalent hydrocarbon groups that are the same as or different from each other, and a represents a positive number of 1.5-2.8) and has at least two alkenyl groups, each of which is bonded to a silicon atom, in each molecule; 0.3-20 parts by weight of (B) an organohydrogen polysiloxane that has at least two hydrogen atoms (SiH functional groups), each of which is bonded to a silicon atom, in each molecule; 5-80 parts by weight of (C) a reinforcing silica; and (D) an addition reaction catalyst, which is configured of a platinum group metal, in an amount of 0.5-1,000 ppm relative to the total weight of the components (A) and (B).Type: GrantFiled: November 29, 2016Date of Patent: December 1, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Shigeki Shudo, Nobu Kato, Hidenori Mizushima, Shigeru Ubukata, Noriyuki Meguriya
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Patent number: 10731007Abstract: Provided is an addition-curable silicone rubber composition that contains (A) an alkenyl group-containing organopolysiloxane, (B) an organohydrogenpolysiloxane, (C) a platinum catalyst and (D) a reinforcement filler material surface treated with a benzotriazole derivative represented by formula (I) (in the formula, R1 is a hydrogen atom or a monovalent hydrocarbon group and R2 is a monovalent organic group) and that is capable of lowering the compression set of a cured article and suppressing changes in hardness after heat degradation characteristic testing while suppressing reduced curability. Also provided are a cured article thereof and a manufacturing method for the addition-curable silicone rubber composition.Type: GrantFiled: January 24, 2017Date of Patent: August 4, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Hidenori Mizushima, Shigeru Ubukata, Shigeki Shudo, Nobu Kato
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Publication number: 20200165455Abstract: An object of the present invention is to provide an addition-curable silicone composition which provides silicone rubber which has the excellent flame retardancy and is excellent in storage stability so that thickening due to dehydrogenation does not occur over time. The present invention provides an addition-curable silicone composition comprising the following components (A) to (E): (A) 100 parts by mass of an organopolysiloxane having two or more alkenyl groups each bonded to a silicon atom and being liquid at 25 degrees C.Type: ApplicationFiled: July 25, 2018Publication date: May 28, 2020Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Ryo ASHIDA, Shigeki SHUDO, Hidenori MIZUSHIMA
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Publication number: 20190225806Abstract: The present invention provides a transparent liquid silicone rubber composition that does not contain an inorganic filler and includes the following as main components: (A) a silicone resin having, as essential structural units, an R3SiO1/2 unit (M unit) and a SiO4/2 unit (Q unit) (R is a monovalent hydrocarbon group containing 1-6 carbon atoms, and at least 2 R's in a molecule are alkenyl groups); (B) a straight-chain or branched organopolysiloxane containing, in a molecule, 2 or more alkenyl groups bonded to silicon atoms; (C) an organohydrogenpolysiloxane containing, in a molecule, 2 or more hydrogen atoms bonded to silicon atoms; (D) an organopolysiloxane which is liquid at room temperature, having a weight-average molecular weight of 37,000 or less and containing, in a molecule, one or more hydroxyl groups bonded to silicon atoms; and (E) a hydrosilylation reaction catalyst.Type: ApplicationFiled: July 20, 2017Publication date: July 25, 2019Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Hironobu MURAMATSU, Shigeki SHUDO
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Publication number: 20190092944Abstract: Provided is an addition-curable silicone rubber composition that contains (A) an alkenyl group-containing organopolysiloxane, (B) an organohydrogenpolysiloxane, (C) a platinum catalyst and (D) a reinforcement filler material surface treated with a benzotriazole derivative represented by formula (I) (in the formula, R1 is a hydrogen atom or a monovalent hydrocarbon group and R2 is a monovalent organic group) and that is capable of lowering the compression set of a cured article and suppressing changes in hardness after heat degradation characteristic testing while suppressing reduced curability. Also provided are a cured article thereof and a manufacturing method for the addition-curable silicone rubber composition.Type: ApplicationFiled: January 24, 2017Publication date: March 28, 2019Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Hidenori MIZUSHIMA, Shigeru UBUKATA, Shigeki SHUDO, Nobu KATO
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Publication number: 20180346722Abstract: An addition-curable silicone rubber composition which contains: 100 parts by weight of (A) an organopolysiloxane that is represented by average composition formula (1) R1aSiO(4-a)/2 (wherein R1 represent monovalent hydrocarbon groups that are the same as or different from each other, and a represents a positive number of 1.5-2.8) and has at least two alkenyl groups, each of which is bonded to a silicon atom, in each molecule; 0.3-20 parts by weight of (B) an organohydrogen polysiloxane that has at least two hydrogen atoms (SiH functional groups), each of which is bonded to a silicon atom, in each molecule; 5-80 parts by weight of (C) a reinforcing silica; and (D) an addition reaction catalyst, which is configured of a platinum group metal, in an amount of 0.5-1,000 ppm relative to the total weight of the components (A) and (B).Type: ApplicationFiled: November 29, 2016Publication date: December 6, 2018Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Shigeki SHUDO, Nobu KATO, Hidenori MIZUSHIMA, Shigeru UBUKATA, Noriyuki MEGURIYA
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Patent number: 9909008Abstract: Provided is an addition-curable liquid silicone rubber composition which is suppressed in thickening over time even in cases where a silicone raw rubber is added into a liquid silicone rubber composition, thereby having excellent storage stability, and which provides a silicone rubber that has a low hardness after being cured. An addition-curable liquid silicone rubber composition which contains: (A) an alkenyl group-containing organopolysiloxane having an average polymerization degree of 1,500 or less, which is in a liquid state at room temperature; (B) an organopolysiloxane having an average polymerization degree of 2,000 or more, which is in the form of a raw rubber at room temperature; (C) an organohydrogen polysiloxane; (D) a fumed silica having a BET specific surface area of 130 m2/g or more; (E) an organosilane and/or organopolysiloxane having a silanol group; and (F) an addition reaction catalyst.Type: GrantFiled: April 20, 2015Date of Patent: March 6, 2018Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Nobu Kato, Shigeki Shudo
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Patent number: 9873794Abstract: Provided is an addition-curable liquid silicone rubber composition which is suppressed in thickening over time even in cases where a silicone raw rubber is added into a liquid silicone rubber composition, thereby having excellent storage stability, and which provides a silicone rubber that has a low hardness after being cured. An addition-curable liquid silicone rubber composition which contains: (A) an alkenyl group-containing organopolysiloxane having an average polymerization degree of 1,500 or less, which is in a liquid state at room temperature; (B) an organopolysiloxane having an average polymerization degree of 2,000 or more, which is in the form of a raw rubber at room temperature; (C) an organohydrogen polysiloxane; (D) a fumed silica having a BET specific surface area of 130 m2/g or more; (E) an organosilane and/or organopolysiloxane having a silanol group; and (F) an addition reaction catalyst.Type: GrantFiled: April 20, 2015Date of Patent: January 23, 2018Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Nobu Kato, Shigeki Shudo
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Publication number: 20170081515Abstract: Provided is an addition-curable liquid silicone rubber composition which is suppressed in thickening over time even in cases where a silicone raw rubber is added into a liquid silicone rubber composition, thereby having excellent storage stability, and which provides a silicone rubber that has a low hardness after being cured. An addition-curable liquid silicone rubber composition which contains: (A) an alkenyl group-containing organopolysiloxane having an average polymerization degree of 1,500 or less, which is in a liquid state at room temperature; (B) an organopolysiloxane having an average polymerization degree of 2,000 or more, which is in the form of a raw rubber at room temperature; (C) an organohydrogen polysiloxane; (D) a fumed silica having a BET specific surface area of 130 m2/g or more; (E) an organosilane and/or organopolysiloxane having a silanol group; and (F) an addition reaction catalyst.Type: ApplicationFiled: April 20, 2015Publication date: March 23, 2017Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Nobu KATO, Shigeki SHUDO
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Patent number: 8173736Abstract: An addition curable liquid silicone rubber composition for injection molding is provided. The composition comprises (A) an organopolysiloxane containing at least two Si-bonded alkenyl groups within each molecule, (B) an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms within each molecule, (C) a fumed silica with a BET specific surface area of 50 m2/g or greater, and (D) an addition reaction catalyst, and exhibiting fluidity such that, at 23° C., the viscosity at a shear velocity of 0.9 s?1 is not higher than 1,000 Pa·s, and the ratio between the viscosity at a shear velocity of 100 s?1 and the viscosity at a shear velocity of 200 s?1 is not higher than 3.5. The composition is resistant to decreases in viscosity of the rubber material under high shear velocity, and generates no burrs on the molded product.Type: GrantFiled: November 10, 2006Date of Patent: May 8, 2012Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Shigeki Shudo
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Patent number: 8158738Abstract: An adhesive silicone rubber composition comprising (A) 100 pbw of an organopolysiloxane containing at least two silicon-bonded alkenyl radicals, (B) 0.5-20 pbw of an organohydrogenpolysiloxane containing at least two Si—H radicals, (C) a hydrosilylation catalyst, and (D) 0.1-50 pbw of an organosilicon compound having at least one phenyl structure, at least one alicyclic epoxy radical, and at least one Si—H radical is applicable to an electrolyte membrane and a separator in a polymer electrolyte fuel cell to form a firm integrally molded part.Type: GrantFiled: June 20, 2008Date of Patent: April 17, 2012Assignees: Toyota Jidosha Kabushiki Kaisha, Shin-Etsu Chemical Co., Ltd.Inventors: Chisato Kato, Kazutaka Iizuka, Osamu Hayashida, Takashi Aketa, Shigeki Shudo
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Publication number: 20100216920Abstract: An adhesive silicone rubber composition comprising (A) 100 pbw of an organopolysiloxane containing at least two silicon-bonded alkenyl radicals, (B) 0.5-20 pbw of an organohydrogenpolysiloxane containing at least two Si—H radicals, (C) a hydrosilylation catalyst, and (D) 0.1-50 pbw of an organosilicon compound having at least one phenyl structure, at least one alicyclic epoxy radical, and at least one Si—H radical is applicable to an electrolyte membrane and a separator in a polymer electrolyte fuel cell to form a firm integrally molded part.Type: ApplicationFiled: June 20, 2008Publication date: August 26, 2010Inventors: Chisato Kato, Kazutaka Iizuka, Osamu Hayashida, Takashi Aketa, Shigeki Shudo
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Patent number: 7271215Abstract: An addition reaction-curable liquid silicone rubber composition includes an organopolysiloxane containing at least one Si-bonded vinyl group only at each end of its backbone and having a viscosity of from 1 to 1,000 Pa·s at 25° C., an organopolysiloxane containing at least two Si-bonded vinyl groups only in side chains on its backbone and having a viscosity of from 0.1 to 100 Pa·s at 25° C., the amount of siloxane units bonded to the vinyl groups being from 2 to 20 mole % of its total siloxane units, finely divided silica having a specific surface area of at least 50 m2/g, hexamethyldisilazane, water, an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms per molecule, and a hydrosilation catalyst. Another addition reaction-curable liquid silicone rubber composition additionally includes a specific non-functional dimethylpolysiloxane.Type: GrantFiled: June 14, 2005Date of Patent: September 18, 2007Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Masayuki Ikeno, Shigeki Shudo, Naoki Yamakawa, Yujiro Taira
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Publication number: 20070112148Abstract: An addition curable liquid silicone rubber composition for injection molding is provided. The composition comprises (A) an organopolysiloxane containing at least two Si-bonded alkenyl groups within each molecule, (B) an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms within each molecule, (C) a fumed silica with a BET specific surface area of 50 m2/g or greater, and (D) an addition reaction catalyst, and exhibiting fluidity such that, at 23° C., the viscosity at a shear velocity of 0.9 s?1 is not higher than 1,000 Pa·s, and the ratio between the viscosity at a shear velocity of 100 s?1 and the viscosity at a shear velocity of 200 s?1 is not higher than 3.5. The composition is resistant to decreases in viscosity of the rubber material under high shear velocity, and generates no burrs on the molded product.Type: ApplicationFiled: November 10, 2006Publication date: May 17, 2007Applicant: Shin-Etsu Chemical Co., Ltd.Inventor: Shigeki Shudo
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Publication number: 20050277725Abstract: An addition reaction-curable liquid silicone rubber composition includes an organopolysiloxane containing at least one Si-bonded vinyl group only at each end of its backbone and having a viscosity of from 1 to 1,000 Pa·s at 25° C., an organopolysiloxane containing at least two Si-bonded vinyl groups only in side chains on its backbone and having a viscosity of from 0.1 to 100 Pa·s at 25° C., the amount of siloxane units bonded to the vinyl groups being from 2 to 20 mole % of its total siloxane units, finely divided silica having a specific surface area of at least 50 m2/g, hexamethyldisilazane, water, an organohydrogenpolysiloxane containing at least two Si-bonded hydrogen atoms per molecule, and a hydrosilation catalyst. Another addition reaction-curable liquid silicone rubber composition additionally includes a specific non-functional dimethylpolysiloxane.Type: ApplicationFiled: June 14, 2005Publication date: December 15, 2005Inventors: Masayuki Ikeno, Shigeki Shudo, Naoki Yamakawa, Yujiro Taira
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Patent number: 6761673Abstract: A liquid form addition curable silicone rubber composition for forming a fluororesin covered fixing roller is provided. This composition includes (a) 100 parts by weight of an organopolysiloxane with at least two alkenyl groups bonded to non-terminal silicon atoms; (b) an organohydrogenpolysiloxane with at least two silicon-bonded hydrogen atoms, in a sufficient quantity to produce a molar ratio of silicon-bonded hydrogen atoms within said constituent (b) relative to silicon-bonded alkenyl groups within said constituent (a) of 0.4 to 5.0; (c) an effective quantity of a platinum based catalyst; (d) 0.1 to 10 parts by weight of dry process silica; and (e) 0.05 to 5 parts by weight of a cyclic diorganopolysiloxane with at least three silicon-bonded alkenyl groups. This composition is used for formation of the silicone rubber layer of a fixing roller made up of a metal core, a silicone rubber layer on the core, and a fluorine based coating provided on the rubber layer.Type: GrantFiled: April 4, 2002Date of Patent: July 13, 2004Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Shigeki Shudo
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Patent number: 6740405Abstract: A liquid form addition curing type silicone rubber composition for roll forming purposes is provided which displays excellent stability and little variation in viscosity over time at room temperature, and yet also offers excellent curability at high temperature.Type: GrantFiled: March 14, 2002Date of Patent: May 25, 2004Assignee: Shin-Etsu Chemical Co., Ltd.Inventor: Shigeki Shudo
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Patent number: 6472078Abstract: A fixing roller purpose liquid addition-curable silicone rubber composition including (A) 100 parts by weight of an organopolysiloxane having in one molecule at least two alkenyl groups bonded to silicon atoms; (B) from 1 part by weight to 30 parts by weight of an organopolysiloxane having hydroxyl groups at both terminals of the molecular chain; (C) an organohydrogenpolysiloxane having in one molecule at least two hydrogen atoms bonded to silicon atoms; and (D) a platinum group metal compound in a catalytically effective quantity. The SiH groups in the component (C) is present in an amount of from 0.4 to 5.0 equivalent weight per one alkenyl group in the component (A). This composition is a substantially non-foamable and addition-curable liquid silicone rubber composition, which is therefore suitable for the fixing roller purpose.Type: GrantFiled: May 30, 2000Date of Patent: October 29, 2002Assignee: Shin-Etsu Chemical Co., Ltd.Inventors: Shigeki Shudo, Shigeru Ubukata