Patents by Inventor Nobu Kato
Nobu Kato 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: 20240101764Abstract: An oil-bleeding silicone rubber composition which comprises 100 parts by mass of (A) an organopolysiloxane containing an alkenyl group, 0.2-20 parts by mass of (B) an organohydrogenpolysiloxane containing a hydrogen atom bonded to a silicon atom, (C) a catalyst based on a platinum-group metal, the amount of which is 0.5-500 ppm in terms of platinum-group metal amount (in mass) with respect to the total mass of the components (A) and (B), 1-10 parts by mass of (D) a specific phenyl-group-containing organopolysiloxane, 1-25 parts by mass of (E) a specific nonfunctional dimethylpolysiloxane, and (F) a specific benzotriazole derivative, the amount of which is 2-100 mol per mol of the platinum atoms contained in the component (C). The oil-bleeding silicone rubber composition gives cured objects having improved heat resistance, without containing any of conventional additives for improving heat resistance.Type: ApplicationFiled: January 13, 2022Publication date: March 28, 2024Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Tatsuei HARA, Nobu KATO, Shigeru UBUKATA
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Patent number: 11866583Abstract: An addition-curable liquid silicone rubber composition and a molded silicone-rubber object are provided. The addition-curable liquid silicone rubber composition comprises (A) an alkenylated linear organopolysiloxane which has one silicon-atom-bonded alkenyl group only at each of both molecular-chain terminals and which has an average degree of polymerization of 1,500 or lower and is liquid at 25° C., (B) an alkenylated linear organopolysiloxane which has two or three silicon-atom-bonded alkenyl groups at each of both molecular-chain terminals and which has an average degree of polymerization of 1,500 or lower and is liquid at 25° C.Type: GrantFiled: April 8, 2019Date of Patent: January 9, 2024Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Nobu Kato
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Publication number: 20230203253Abstract: A two-pack addition-curable silicone rubber composition, containing: (A) an alkenyl-group-containing organopolysiloxane; (B) an organohydrogenpolysiloxane; (C) a platinum-based catalyst; (D) benzotriazole and/or a benzotriazole derivative; (E-1) an acetylene alcohol compound and/or a compound modified with silane or siloxane; and (E-2) an alkenyl-group-containing cyclic organopolysiloxane and/or an alkenyl-group-containing chain organopolysiloxane that has a large amount of alkenyl groups and differs from the component (A), wherein a composition X contains the components (C) and (E-2), a composition Y contains the components (B), (D), and (E-1), at least one of the compositions X or Y contains the component (A), and the two-pack addition-curable silicone rubber composition is curable by mixing the composition X and the composition Y.Type: ApplicationFiled: April 12, 2021Publication date: June 29, 2023Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Tatsuei HARA, Nobu KATO
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Patent number: 11401421Abstract: The purpose of the present invention is to provide an addition-curable silicone rubber composition which gives a cured product having a controlled oil-bleeding property and releasability from a mold, without increasing an amount of a bleeding oil to be added. Thus, the present invention provides an addition-curable silicone rubber composition comprising the following components (A) to (D): (A) 100 parts by mass of an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom, (B) 0.Type: GrantFiled: April 13, 2018Date of Patent: August 2, 2022Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Tatsuei Hara, Ryo Ashida, Hidenori Mizushima, Shigeru Ubukata, Nobu Kato
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Publication number: 20220064446Abstract: An addition-curable silicone rubber composition which contains: 100 parts by mass of (A) an organopolysiloxane that has at least two alkenyl groups, each of which is bonded to a silicon atom, in each molecule, and wherein an alkenyl group is bonded to a silicon atom at one end or both ends of the molecular chain; 1-80 parts by mass of (B) ?-cyclodextrin; (C) an organohydrogen polysiloxane that has at least two hydrogen atoms, each of which is bonded to a silicon atom, in each molecule in such an amount that the molar ratio of the hydrogen atoms bonded to silicon atoms (Si—H groups) to the total amount of the alkenyl groups bonded to silicon atoms in the entire composition, namely (Si—H groups)/(Si-alkenyl groups) is from 0.5 to 5.0; and a catalytic amount of (D) an addition reaction catalyst.Type: ApplicationFiled: December 10, 2019Publication date: March 3, 2022Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Nobu KATO
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Publication number: 20220064449Abstract: The present invention provides an addition-curable self-adhesive silicone rubber composition and a silicone rubber cured product.Type: ApplicationFiled: January 7, 2020Publication date: March 3, 2022Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Tatsuei HARA, Nobu KATO
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Publication number: 20210292556Abstract: An addition-curable liquid silicone rubber composition and a molded silicone-rubber object are provided. The addition-curable liquid silicone rubber composition comprises (A) an alkenylated linear organopolysiloxane which has one silicon-atom-bonded alkenyl group only at each of both molecular-chain terminals and which has an average degree of polymerization of 1,500 or lower and is liquid at 25° C., (B) an alkenylated linear organopolysiloxane which has two or three silicon-atom-bonded alkenyl groups at each of both molecular-chain terminals and which has an average degree of polymerization of 1,500 or lower and is liquid at 25° C.Type: ApplicationFiled: April 8, 2019Publication date: September 23, 2021Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Nobu KATO
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Publication number: 20210108079Abstract: The purpose of the present invention is to provide an addition-curable silicone rubber composition which gives a cured product having a controlled oil-bleeding property and releasability from a mold, without increasing an amount of a bleeding oil to be added. Thus, the present invention provides an addition-curable silicone rubber composition comprising the following components (A) to (D): (A) 100 parts by mass of an organopolysiloxane having at least two alkenyl groups each bonded to a silicon atom, (B) 0.Type: ApplicationFiled: April 13, 2018Publication date: April 15, 2021Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Tatsuei HARA, Ryo ASHIDA, Hidenori MIZUSHIMA, Shigeru UBUKATA, Nobu KATO
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Patent number: 10865308Abstract: Provided is an addition-curable liquid silicone rubber composition which has good curability and still provides a silicone rubber having a durometer type A hardness of 5-15 as measured after being cured and a high tear strength. The addition-curable liquid silicone rubber composition contains (A) an alkenyl group-containing organopolysiloxane having two or more silicon atom-bonded alkenyl groups per molecule, and an average polymerization degree of 1,500 or less, and is liquid at 25° C., (B) (B-1) an organohydrogenpolysiloxane containing six or more silicon atom-bonded hydrogen atoms per molecule, and not having an aromatic group, (B-2) an organohydrogenpolysiloxane containing 3-5 silicon atom-bonded hydrogen atoms per molecule, and not having an aromatic group, (B-3) an organohydrogenpolysiloxane containing 1 or 2 silicon atom-bonded hydrogen atoms per molecule, and not having an aromatic group, (C) a fumed silica having a BET specific surface area of 130 m2/g or more, and (D) an addition reaction catalyst.Type: GrantFiled: April 7, 2017Date of Patent: December 15, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Nobu Kato
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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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Publication number: 20200369886Abstract: Provided is an addition-curable liquid silicone rubber composition which has good curability and still provides a silicone rubber having a durometer type A hardness of 5-15 as measured after being cured and a high tear strength. The addition-curable liquid silicone rubber composition contains (A) an alkenyl group-containing organopolysiloxane having two or more silicon atom-bonded alkenyl groups per molecule, and an average polymerization degree of 1,500 or less, and is liquid at 25° C., (B)(B-1) an organohydrogenpolysiloxane containing six or more silicon atom-bonded hydrogen atoms per molecule, and not having an aromatic group, (B-2) an organohydrogenpolysiloxane containing 3-5 silicon atom-bonded hydrogen atoms per molecule, and not having an aromatic group, (B-3) an organohydrogenpolysiloxane containing 1 or 2 silicon atom-bonded hydrogen atoms per molecule, and not having an aromatic group, (C) a fumed silica having a BET specific surface area of 130 m2/g or more, and (D) an addition reaction catalyst.Type: ApplicationFiled: April 7, 2017Publication date: November 26, 2020Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventor: Nobu KATO
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Patent number: 10844196Abstract: This thermally-conductive silicone composition comprises: (A) an organopolysiloxane having two or more alkenyl groups per molecule, and having a kinetic viscosity of 10-100,000 mm2/s at 25° C., (B) a hydrolyzable methyl polysiloxane which is represented by formula (1) (R1 represents an alkyl group, and a is 5-100) and of which one end is trifunctional, (C) a thermally-conductive filler having a thermal conductivity of 10 W/m·° C. or more, (D) an organohydrogen polysiloxane having two or more Si—H groups per molecule, (E) a catalyst selected from the group consisting of platinum and platinum compounds, and (F) a benzotriazole derivative represented by formula (2) (R2 represents H or a monovalent hydrocarbon group, and R3 represents a monovalent organic group). The composition can inhibit the decrease of the curing speed.Type: GrantFiled: October 13, 2017Date of Patent: November 24, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Kenichi Tsuji, Nobu Kato, Munenao Hirokami
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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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Patent number: 10544281Abstract: Provided is an addition-curable silicone rubber composition containing (A) an alkenyl group-containing organopolysiloxane having alkenyl groups bonded to at least two silicon atoms per molecule, (B) an organohydrogenpolysiloxane containing hydrogen atoms bonded to at least two silicon atoms per molecule, (C) a platinum catalyst, and (D) a benzotriazole derivative represented by general formula (I) (in the formula, R1 is a hydrogen atom or monovalent hydrocarbon group, R2 is a monovalent organic group) that makes it possible to provide silicone rubber that can lower the compression set without harming the curing rate and suppress discoloration after a heat resistance test.Type: GrantFiled: June 7, 2016Date of Patent: January 28, 2020Assignee: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Nobu Kato, Munenao Hirokami
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Publication number: 20190309206Abstract: This thermally-conductive silicone composition comprises: (A) an organopolysiloxane having two or more alkenyl groups per molecule, and having a kinetic viscosity of 10-100,000 mm2/s at 25° C., (B) a hydrolyzable methyl polysiloxane which is represented by formula (1) (R1 represents an alkyl group, and a is 5-100) and of which one end is trifunctional, (C) a thermally-conductive filler having a thermal conductivity of 10 W/m·° C. or more, (D) an organohydrogen polysiloxane having two or more Si—H groups per molecule, (E) a catalyst selected from the group consisting of platinum and platinum compounds, and (F) a benzotriazole derivative represented by formula (2) (R2 represents H or a monovalent hydrocarbon group, and R3 represents a monovalent organic group). The composition can inhibit the decrease of the curing speed.Type: ApplicationFiled: October 13, 2017Publication date: October 10, 2019Applicant: Shin-Etsu Chemical Co., Ltd.Inventors: Kenichi TSUJI, Nobu KATO, Munenao HIROKAMI
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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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Publication number: 20180134871Abstract: Provided is an addition-curable silicone rubber composition containing (A) an alkenyl group-containing organopolysiloxane having alkenyl groups bonded to at least two silicon atoms per molecule, (B) an organohydrogenpolysiloxane containing hydrogen atoms bonded to at least two silicon atoms per molecule, (C) a platinum catalyst, and (D) a benzotriazole derivative represented by general formula (I) (in the formula, R1 is a hydrogen atom or monovalent hydrocarbon group, R2 is a monovalent organic group) that makes it possible to provide silicone rubber that can lower the compression set without harming the curing rate and suppress discoloration after a heat resistance test.Type: ApplicationFiled: June 7, 2016Publication date: May 17, 2018Applicant: SHIN-ETSU CHEMICAL CO., LTD.Inventors: Nobu KATO, Munenao HIROKAMI
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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