Patents by Inventor Daiki TAKEKAWA
Daiki TAKEKAWA 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: 11780993Abstract: An NBR composition for rubber laminated metal having 1 to 3 parts by weight of sulfur and 1 to 15 parts by weight of a disulfide compound such as 4,4?-dithiodimorpholine or dithiodicaprolactam represented by the general formula RN—S—S—NR (wherein RN is a cyclic linking group formed together with the N atom bonded to the S atom), based on 100 parts by weight of NBR. The rubber composition that can improve the protrusion properties of a rubber layer when used for, for example, a gasket or a brake shim material that is a laminated composite metal laminated with another metal plate.Type: GrantFiled: October 16, 2018Date of Patent: October 10, 2023Assignee: NOK CORPORATIONInventors: Isao Watanabe, Daiki Takekawa
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Publication number: 20230304581Abstract: A rubber-metal laminate that includes a metal member; and a rubber layer provided on the metal member, wherein the rubber layer has a 100%-modulus value in accordance with JIS K6251 of 6.0 MPa or more and a thickness of less than 80 µm. The gasket includes the rubber-metal laminate.Type: ApplicationFiled: March 10, 2021Publication date: September 28, 2023Applicant: NOK CORPORATIONInventors: Isao WATANABE, Ryota SHIMURA, Daiki TAKEKAWA
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Publication number: 20230140565Abstract: A rubber-metal laminate that includes a metal member; and a rubber layer provided on the metal member, wherein the rubber layer has a 100%-modulus value in accordance with JIS K6251 of 8.5 MPa or more and a thickness of 80 ?m or more. A gasket that includes the rubber-metal laminate.Type: ApplicationFiled: February 24, 2021Publication date: May 4, 2023Applicant: NOK CORPORATIONInventors: Isao WATANABE, Ryota SHIMURA, Daiki TAKEKAWA
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Publication number: 20230072950Abstract: A gasket includes an elastic part containing a rubber having a dynamic-to-static ratio, Kd/Kst, of 2.5 or lower, wherein the dynamic-to-static ratio, Kd/Kst, is a ratio between a dynamic spring constant, Kd, and a static spring constant, Kst. The dynamic spring constant, Kd, represents a constant as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007, and the static spring constant, Kst, represents a constant as measured under conditions of 23±2° C. and a strain amplitude of 0.1% according to JIS K6394:2007.Type: ApplicationFiled: February 3, 2021Publication date: March 9, 2023Applicant: NOK CORPORATIONInventors: Isao WATANABE, Ryota SHIMURA, Daiki TAKEKAWA
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Publication number: 20230073538Abstract: A gasket includes an elastic part containing a rubber having a dynamic spring constant of 1.5 g/?m or lower as measured under conditions of 23±2° C., 100 Hz, and a strain amplitude of 0.1% according to JIS K6394:2007.Type: ApplicationFiled: February 3, 2021Publication date: March 9, 2023Applicant: NOK CORPORATIONInventors: Isao WATANABE, Ryota SHIMURA, Daiki TAKEKAWA
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Publication number: 20230029142Abstract: A coating solution comprising an organic solvent solution containing polyol-crosslinkable fluororubber, a polyol vulcanizing agent, and N-phenyl-3-aminopropyltrialkoxysilane, preferably a coating solution further containing an epoxy resin in addition thereto, and a fluororubber metal laminated sheet formed by applying the above coating solution to a metal sheet, followed by vulcanization. The coating solution can not only impart stability over time to the fluororubber paste, but also improve the interlayer adhesion and abrasion resistance of the fluororubber metal laminated sheet. Therefore, when it is used as a cylinder head gasket, it is possible to cope with the reduction in rigidity due to the increase in combustion pressure of the engine, and with weight saving. As a result, it will greatly contribute to the improvement of fuel efficiency of automobiles.Type: ApplicationFiled: November 10, 2020Publication date: January 26, 2023Applicant: NOK CORPORATIONInventors: Isao WATANABE, Daiki TAKEKAWA
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Patent number: 11466642Abstract: A gasket material, in which a crosslinked rubber layer compounding 30 to 200 parts by weight of titanium oxide based on 100 parts by weight of NBR or hydrogenated NBR is formed on a metal plate, improves blister resistance, and thus exhibits an excellent effect of preventing rubber peeling of the gasket in the engine and leading to an improvement of engine malfunction. Further, the use of NBR or hydrogenated NBR results in an advantage of low cost relative to that of fluororubber. Therefore, the gasket material of the present invention is effectively used as a cylinder head gasket.Type: GrantFiled: October 16, 2018Date of Patent: October 11, 2022Assignee: NOK CORPORATIONInventors: Daiki Takekawa, Isao Watanabe
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Publication number: 20220136603Abstract: A hydrogenated NBR composition comprising 30 to 200 parts by weight of titanium oxide and 1 to 8 parts by weight of magnesium oxide, based on 100 parts by weight of hydrogenated NBR. By forming a crosslinked rubber layer of the rubber composition on a metal plate, a gasket material with excellent blister resistance, whose roll kneadability is improved without reducing the rubber strength of hydrogenated NBR, is provided. Moreover, the rubber composition is effective as a rubber raw material for use in soft metal or a high hardness hydrogenated NBR material for which kneading processing is difficult.Type: ApplicationFiled: February 13, 2020Publication date: May 5, 2022Applicant: NOK CORPORATIONInventors: Isao WATANABE, Daiki TAKEKAWA
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Patent number: 11312850Abstract: A gasket material comprising a crosslinked fluororubber layer having a micro-hardness of 5 to 25 formed on a metal plate using a fluororubber composition comprising 30 to 70 parts by weight of carbon black having a CTAB specific surface area of 3 to 34 m2/g, and 5 to 15 parts by weight of hydrated amorphous silicon dioxide having a BET specific surface area of 35 to 220 m2/g, based on 100 parts by weight of fluororubber, wherein the total amount of carbon black and hydrated amorphous silicon dioxide is 80 parts by weight or less.Type: GrantFiled: November 22, 2018Date of Patent: April 26, 2022Assignee: NOK CORPORATIONInventors: Daiki Takekawa, Masahiro Yokoo
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Publication number: 20210189996Abstract: A gasket material, in which a crosslinked rubber layer compounding 30 to 200 parts by weight of titanium oxide based on 100 parts by weight of NBR or hydrogenated NBR is formed on a metal plate, improves blister resistance, and thus exhibits an excellent effect of preventing rubber peeling of the gasket in the engine and leading to an improvement of engine malfunction. Further, the use of NBR or hydrogenated NBR results in an advantage of low cost relative to that of fluororubber. Therefore, the gasket material of the present invention is effectively used as a cylinder head gasket.Type: ApplicationFiled: October 16, 2018Publication date: June 24, 2021Applicant: NOK CORPORATIONInventors: Daiki TAKEKAWA, Isao WATANABE
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Publication number: 20200362153Abstract: A gasket material comprising a crosslinked fluororubber layer having a micro-hardness of 5 to 25 formed on a metal plate using a fluororubber composition comprising 30 to 70 parts by weight of carbon black having a CTAB specific surface area of 3 to 34 m2/g, and 5 to 15 parts by weight of hydrated amorphous silicon dioxide having a BET specific surface area of 35 to 220 m2/g, based on 100 parts by weight of fluororubber, wherein the total amount of carbon black and hydrated amorphous silicon dioxide is 80 parts by weight or less.Type: ApplicationFiled: November 22, 2018Publication date: November 19, 2020Applicant: NOK CORPORATIONInventors: Daiki TAKEKAWA, Masahiro YOKOO
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Publication number: 20200354548Abstract: An NBR composition for rubber laminated metal, having 1 to 3 parts by weight of sulfur and 1 to 15 parts by weight of a disulfide compound such as 4,4?-dithiodimorpholine or dithiocaprolactam represented by the general formula RN-S-S-NR (wherein RN is a cyclic linking group formed together with the N atom bonded to the S atom), based on 100 parts by weight of NBR. The rubber composition that can improve the protrusion properties of a rubber layer when used for, for example, a gasket or a brake shim material that is a laminated composite metal laminated with another metal plate.Type: ApplicationFiled: October 16, 2018Publication date: November 12, 2020Applicant: NOK CORPORATIONInventors: Isao WATANABE, Daiki TAKEKAWA