Patents by Inventor Rikimaru Kuwabara
Rikimaru Kuwabara 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: 20240002642Abstract: A rubber bale including a modified conjugated diene-based polymer, and a surfactant having a hydrophilic-lipophilic balance (HLB) of 9.0 or less. A method for producing a rubber bale, including mixing a polymer solution containing a modified conjugated diene-based polymer dissolved in a solvent and a surfactant having a HLB of 9.0 or less to form a solution, and removing the solvent from the solution.Type: ApplicationFiled: October 14, 2021Publication date: January 4, 2024Applicant: ENEOS Materials CorporationInventor: Rikimaru KUWABARA
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Publication number: 20230312889Abstract: Provided is a polymer composition containing (A) a modified conjugated diene-based polymer which includes a monomer unit derived from a conjugated diene compound and has a molecular weight distribution Mw/Mn of 1.50 to 3.00 and in which some or all of the molecules are modified, the molecular weight distribution being represented by a ratio of polystyrene-equivalent weight-average molecular weight Mw to number-average molecular weight Mn measured by gel permeation chromatography, and (B) a surfactant having HLB of 9.0 or less and having an oxypropylene group, the polymer composition further containing (C) an extender oil as an optional component, in which a total amount of the modified conjugated diene-based polymer (A), the surfactant (B) and the extender oil (C) is 95 mass % or more based on the entire composition.Type: ApplicationFiled: March 24, 2023Publication date: October 5, 2023Applicant: ENEOS Materials CorporationInventors: Akihiko OOKUBO, Tetsuya YAMAMOTO, Junjie WANG, Rikimaru KUWABARA
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Publication number: 20210395500Abstract: This polymer composition includes: a modified conjugated diene-based polymer having at least one nitrogen-containing functional group selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group, a primary amino group having been protected or converted into an onium group, a secondary amino group having been protected or converted into an onium group, and a tertiary amino group having been converted into an onium group; and a functional-group-containing polymer having at least one functional group selected from the group consisting of an epoxy group, an acid anhydride structure, an oxazoline group, a hydroxyl group, a carboxyl group, and a sulfo group.Type: ApplicationFiled: December 2, 2019Publication date: December 23, 2021Applicant: JSR CORPORATIONInventor: Rikimaru KUWABARA
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Patent number: 11168184Abstract: A production process of a rubber composition containing a modified conjugated diene-based polymer, which can provide a rubber composition in which processability is excellent, and a filling agent, when contained, has favorable dispersibility therein. The production process of the rubber composition includes: a first step of kneading a modified conjugated diene-based polymer that is obtained by polymerizing a monomer containing a conjugated diene compound and has at least one nitrogen-containing functional group selected from a primary amino group, a secondary amino group, a tertiary amino group and groups in which these amino groups have been converted into an onium group, and a basic compound having an acid dissociation constant of 8.0 or more; and a second step of kneading the kneaded product obtained in the first step and a cross-linking agent.Type: GrantFiled: February 6, 2020Date of Patent: November 9, 2021Assignee: JSR CorporationInventors: Koichiro Tani, Ryota Funaki, Rikimaru Kuwabara, Hiroyuki Morita, Takaomi Matsumoto
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Publication number: 20200339768Abstract: Provided is a composition for a fiber-reinforced resin, for producing a fiber-reinforced resin capable of providing a formed article excellent in mechanical strength (e.g., impact resistance and flexural strength). The composition for a fiber-reinforced resin includes a block polymer (A), and a polymer (B) including at least one functional group selected from the group consisting of an epoxy group, an oxazoline group, and an acid anhydride structure.Type: ApplicationFiled: November 14, 2017Publication date: October 29, 2020Applicant: JSR CORPORATIONInventors: Rikimaru KUWABARA, Akihiko MORIKAWA, Shuugo MAEDA
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Publication number: 20200172682Abstract: The present invention has as its object the provision of a production process of a rubber composition containing a modified conjugated diene-based polymer, which can provide a rubber composition in which processability is excellent, and a filling agent, when contained, has favorable dispersibility therein. The production process of a rubber composition according to the present invention includes: a first step of kneading a modified conjugated diene-based polymer that is obtained by polymerizing a monomer containing a conjugated diene compound and has at least one nitrogen-containing functional group selected from the group consisting of a primary amino group, a secondary amino group, a tertiary amino group and groups in which these amino groups have been converted into an onium group, and a basic compound having an acid dissociation constant of 8.0 or more; and a second step of kneading the kneaded product obtained in the first step and a cross-linking agent.Type: ApplicationFiled: February 6, 2020Publication date: June 4, 2020Applicant: JSR CorporationInventors: Koichiro TANI, Ryota FUNAKI, Rikimaru KUWABARA, Hiroyuki MORITA, Takaomi MATSUMOTO
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Publication number: 20140223832Abstract: A polyurethane is produced by reacting a mixture including at least (A) a diisocyanate, (B) a polyol, and (C) a chain extender, the polyol (B) having the number average molecular weight of 400 to 5000, the chain extender (C) including (C1) a compound shown by the following general formula (1) and (C2) a compound shown by the following general formula (2), the compound (C1) and the compound (C2) having a number average molecular weight of less than 400, and a ratio “M1/(M1+M2)” calculated by using the number of moles (M1) of the compound (C1) and the number of moles (M2) of the compound (C2) being 0.25 to 0.9.Type: ApplicationFiled: April 16, 2014Publication date: August 14, 2014Applicant: JSR CORPORATIONInventors: Takahiro OKAMOTO, Rikimaru Kuwabara
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Patent number: 8388799Abstract: A composition for forming a chemical mechanical polishing pad having polishing characteristics such as a high polishing rate, an excellent planarity of the polished object, and less scratches of the polished object. The composition includes (A) a polyurethane having a carbon-carbon double bond on a side chain and (B) a cross-linking agent. The polyurethane (A) is preferably a thermoplastic polyurethane (A?) obtained by mixing at least components (a11) to (a13) and component (a2) in a proportion satisfying the following conditions (1) and (2) and reacting them.Type: GrantFiled: January 22, 2009Date of Patent: March 5, 2013Assignee: JSR CorporationInventors: Rikimaru Kuwabara, Takahiro Okamoto, Yukio Hosaka, Takafumi Shimizu, Tsuyoshi Watanabe
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Publication number: 20120083187Abstract: A polyurethane is produced by reacting a mixture including at least (A) a diisocyanate, (B) a polyol, and (C) a chain extender, the polyol (B) having the number average molecular weight of 400 to 5000, the chain extender (C) including (C1) a compound shown by the following general formula (1) and (C2) a compound shown by the following general formula (2), the compound (C1) and the compound (C2) having a number average molecular weight of less than 400, and a ratio “M1/(M1+M2)” calculated by using the number of moles (M1) of the compound (C1) and the number of moles (M2) of the compound (C2) being 0.25 to 0.9.Type: ApplicationFiled: May 31, 2010Publication date: April 5, 2012Applicant: JSR CORPORATIONInventors: Takahiro Okamoto, Rikimaru Kuwabara
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Patent number: 8053521Abstract: The present invention relates to polishing pads, including at least 60 to 99 parts by weight of a polymer matrix (A) having 1,2-polybutadiene; and 1 to 40 parts by weight of component (B) having a copolymer having a polyether block, where the total amount of the polishing pad is 100 parts by mass, polymer matrix (A) includes 1,2-polybutadiene in an amount of at least 60 parts by weight, relative to 100 parts by mass of the polishing pad, component (B) includes the copolymer having a polyether block in an amount of at most 40 parts by weight relative to 100 parts by mass of the polishing pad, and the polishing pads have a surface resistivity of 2.6×107 to 9.9×1013?.Type: GrantFiled: January 30, 2007Date of Patent: November 8, 2011Assignee: JSR CorporationInventors: Takahiro Okamoto, Rikimaru Kuwabara, Keisuke Kuriyama, Shoei Tsuji
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Patent number: 7790788Abstract: There is provided a method for producing a chemical mechanical polishing pad, the method comprising the steps of (1) producing a sheet-shaped polymer molded article and (2) irradiating the sheet-shaped polymer molded article with an electron beam within an irradiation dose of 10 to 400 kGy. A chemical mechanical polishing pad produced by the above method has advantages that it is excellent in removal rate and scratches and in-plane uniformity on a polished surface and that it shows a stable removal rate even when polishing a number of objects to be polished successively.Type: GrantFiled: October 17, 2008Date of Patent: September 7, 2010Assignee: JSR CorporationInventors: Yukio Hosaka, Rikimaru Kuwabara
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Publication number: 20090191795Abstract: Provided is a composition for forming a polishing layer of a chemical mechanical polishing pad having polishing characteristics such as a high polishing rate, an excellent planarity of the polished object and less scratches of the polished object. The above composition for forming a polishing layer of a chemical mechanical polishing pad comprises (A) a polyurethane having a carbon-carbon double bond on a side chain and (B) a cross-linking agent.Type: ApplicationFiled: January 22, 2009Publication date: July 30, 2009Applicant: JSR CORPORATIONInventors: Rikimaru KUWABARA, Takahiro Okamoto, Yukio Hosaka, Takafumi Shimizu, Tsuyoshi Watanabe
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Publication number: 20090104856Abstract: There is provided a method for producing a chemical mechanical polishing pad, the method comprising the steps of (1) producing a sheet-shaped polymer molded article and (2) irradiating the sheet-shaped polymer molded article with an electron beam within an irradiation dose of 10 to 400 kGy. A chemical mechanical polishing pad produced by the above method has advantages that it is excellent in removal rate and scratches and in-plane uniformity on a polished surface and that it shows a stable removal rate even when polishing a number of objects to be polished successively.Type: ApplicationFiled: October 17, 2008Publication date: April 23, 2009Applicant: JSR CORPORATIONInventors: Yukio HOSAKA, Rikimaru KUWABARA
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Publication number: 20090036045Abstract: A chemical mechanical polishing pad which provides a high removal rate, can suppress the production of a scratch on the polished surface completely and can achieve high in-plane uniformity in the amount of polishing of the polished surface. The chemical mechanical polishing pad has a surface resistivity of its polishing layer of 1.0×107 to 9.9×1013?. The polishing layer is made of a composition containing (A) a polymer matrix component having a volume resistivity of 1.0×1013 to 9.9×1017 ?·cm and (B) a component having a volume resistivity of 1.0×106 to 9.9×1012 ?·cm.Type: ApplicationFiled: January 30, 2007Publication date: February 5, 2009Applicant: JSR CORPORATIONInventors: Takahiro Okamoto, Rikimaru Kuwabara, Keisuke Kuriyama, Shoei Tsuji