Patents by Inventor Hirofumi SENGA
Hirofumi SENGA 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: 11970637Abstract: Provided is a block polymer including two or more polymer block As each having a value ? of 0.20 or less and a functional group F containing at least one element selected from a group consisting of nitrogen, silicon, oxygen, and sulfur in a part or all of terminals of the two or more polymer block As, in which the block polymer has a value ? of 0.75 or more, when p, q, r and s are defined as a component proportion (molar proportion) of a structural unit represented by Formula (1), a component proportion of a structural unit represented by Formula (2), a component proportion of a structural unit represented by Formula (3), and a component proportion of a structural unit represented by Formula (4), in the polymer, respectively.Type: GrantFiled: March 8, 2022Date of Patent: April 30, 2024Assignee: ENEOS MATERIALS CORPORATIONInventors: Toshimitsu Kikuchi, Hirofumi Senga, Tatsumoto Nakahama, Takuya Sano, Takato Fukumoto, Yuto Sakagami, Toshiyuki Hayakawa
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Patent number: 11912873Abstract: There is provided a polymer composition using which a molded product having excellent balance between rigidity, wear resistance, viscoelastic properties, and heat resistance can be obtained. A polymer composition according to the disclosure includes (A) a conjugated diene rubber (where, a polymer corresponding to the following component (B) is excluded); and (B) a hydrogenated product of a polymer that satisfies the following (1) to (3), which is a polymer in which 80% or more of structural units derived from butadiene are hydrogenated: (1) being a copolymer of a conjugated diene compound containing butadiene and an aromatic vinyl compound, (2) including a polybutadiene block having a vinyl group content of 20% or less, and (3) including a block composed of a conjugated diene compound and an aromatic vinyl compound.Type: GrantFiled: January 29, 2021Date of Patent: February 27, 2024Assignee: ENEOS Materials CorporationInventors: Toshimitsu Kikuchi, Takuya Sano, Hirofumi Senga, Yuto Sakagami, Takato Fukumoto, Toshiyuki Hayakawa
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Publication number: 20240042800Abstract: A polymer composition includes a conjugated diene-based polymer (A) and a filler having a Mohs hardness of 5 or more (B), where the conjugated diene-based polymer (A) contains a polymer (A1) satisfying expression (i) when a composition ratio (molar ratio) of a structural unit represented by formula (1), a structural unit represented by formula (2), a structural unit represented by formula (3) and a structural unit represented by formula (4) in the polymer is p, q, r and s, respectively. 0.75?(p+(0.5×r))/(p+q+(0.5×r)+s)?0.Type: ApplicationFiled: December 1, 2021Publication date: February 8, 2024Applicant: ENEOS Materials CorporationInventors: Toshimitsu KIKUCHI, Hirofumi SENGA, Yuto SAKAGAMI, Takuya SANO, Takato FUKUMOTO, Toshiyuki HAYAKAWA
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Publication number: 20240002643Abstract: A polymer composition includes a conjugated diene-based polymer (A) and a liquid polymer (B). The conjugated diene-based polymer (A) includes a polymer (A1) satisfying expression (i) when a composition ratio (molar ratio) of a structural unit represented by formula (1), a structural unit represented by formula (2), a structural unit represented by formula (3) and a structural unit represented by formula (4) in the polymer is p, q, r and s, respectively; a glass transition temperature of the polymer (A1) is ?40° C. or less; and the liquid polymer (B) is polybutadiene, polyisoprene, polyisobutylene, polybutene, or the like. 0.75(p+(0.5×r))/(p+q+(0.5×r)+s)?0.Type: ApplicationFiled: November 29, 2021Publication date: January 4, 2024Applicant: ENEOS Materials CorporationInventors: Hirofumi SENGA, Toshimitsu KIKUCHI, Yuto SAKAGAMI, Takuya SANO, Takato FUKUMOTO, Toshiyuki HAYAKAWA
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Publication number: 20220290017Abstract: Provided is a block polymer including two or more polymer block As each having a value ? of 0.20 or less and a functional group F containing at least one element selected from a group consisting of nitrogen, silicon, oxygen, and sulfur in a part or all of terminals of the two or more polymer block As, in which the block polymer has a value ? of 0.75 or more, when p, q, r and s are defined as a component proportion (molar proportion) of a structural unit represented by Formula (1), a component proportion of a structural unit represented by Formula (2), a component proportion of a structural unit represented by Formula (3), and a component proportion of a structural unit represented by Formula (4), in the polymer, respectively.Type: ApplicationFiled: March 8, 2022Publication date: September 15, 2022Applicant: ENEOS MATERIALS CORPORATIONInventors: Toshimitsu KIKUCHI, Hirofumi SENGA, Tatsumoto NAKAHAMA, Takuya SANO, Takato FUKUMOTO, Yuto SAKAGAMI, Toshiyuki HAYAKAWA
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Publication number: 20220289886Abstract: Provided is a block copolymer containing 10 mass % or more of a polymer (A1) having a multi-branched structure having four or more polymer chains, the polymer chain having a polymer block A containing 70 mass % or more of a structural unit derived from a conjugated diene compound and a polymer block B containing 70 mass % or more of a structural unit derived from an aromatic vinyl compound, the block copolymer having a functional group F containing at least one element selected from the group consisting of nitrogen, silicon, oxygen, and sulfur in a part or all of terminals of the four or more polymer chains, and the block copolymer having a value ? of 0.75 or more represented by the following equation (i), when p, q, r, and s are defined as component proportions (molar proportions) of structural unit represented by the following formula (1) to formula (4), in the polymer, respectively.Type: ApplicationFiled: March 8, 2022Publication date: September 15, 2022Applicant: ENEOS MATERIALS CORPORATIONInventors: Toshimitsu KIKUCHI, Hirofumi SENGA, Tatsumoto NAKAHAMA, Takuya SANO, Takato FUKUMOTO, Yuto SAKAGAMI, Toshiyuki HAYAKAWA
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Publication number: 20220251351Abstract: A cross-linked product obtained through crosslinking a polymer composition that contains a rubber component, an inorganic filler and a cross-linking agent and that satisfies conditions (a) to (c): (a) the rubber component contains a conjugated diene-based polymer (A) having, when composition ratios (molar ratios) in the conjugated diene-based polymer (A) of structural units represented by formulae (1) to (4) are p, q, r, and s, respectively, a value ? represented by formula (i) of 0.80 or more and 0.97 or less; (b) a blending ratio of the conjugated diene-based polymer (A) is 10% by mass or more relative to a total amount of the rubber component; and (c) a blending ratio of the inorganic filler is 40 to 150 parts by mass relative to 100 parts by mass of the rubber component, wherein the Tg of the cross-linked product is ?25° C. or lower.Type: ApplicationFiled: March 30, 2020Publication date: August 11, 2022Applicant: JSR CORPORATIONInventors: Takumi ADACHI, Yuto SAKAGAMI, Hirofumi SENGA, Takuya SANO, Takato FUKUMOTO, Michitaka KAIZU, Toshimitsu KIKUCHI, Toshiyuki HAYAKAWA
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Publication number: 20220153971Abstract: A hydrogenated conjugated diene-based polymer which has a structure formed by bonding a nitrogen-containing compound having two or more alkoxysilyl groups and two or more nitrogen atoms with a plurality of conjugated diene-based polymer chains, wherein: when a composition ratio (molar ratio) in the hydrogenated conjugated diene-based polymer of each of a structural unit represented by formula (1), a structural unit represented by formula (2), a structural unit represented by formula (3), and a structural unit represented by formula (4) is p, q, r, and s, respectively, a value a represented by formula (i) is 0.80 or more and 0.97 or less, and an equilibrium storage modulus E? of the hydrogenated conjugated diene-based polymer is 2.4 MPa or more, ?=(p+(0.5×xr))/(p+q+(0.5×xr)+s) . . .Type: ApplicationFiled: March 27, 2020Publication date: May 19, 2022Applicant: JSR CORPORATIONInventors: Takumi ADACHI, Hirofumi SENGA, Michitaka KAIZU, Toshimitsu KIKUCHI, Takuya SANO
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Publication number: 20220098380Abstract: A polymer composition includes a conjugated diene polymer (A) and a compound (B). The compound (B) is at least one compound selected from the group consisting of a polysiloxane compound and a fluorine-containing compound. The conjugated diene polymer (A) contains, when the composition ratios (molar ratios) in the polymer of the structural units represented by formulas (1) to (4) are p, q, r, and s, respectively, a polymer (A-1) satisfying formula (i). 0.75?(p+(0.5×r))/(p+q+(0.5×r)+s)?0.Type: ApplicationFiled: September 20, 2021Publication date: March 31, 2022Applicant: JSR CORPORATIONInventors: Toshimitsu KIKUCHI, Hirofumi SENGA, Yuto SAKAGAMI, Takuya SANO, Takato FUKUMOTO, Toshiyuki HAYAKAWA
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Publication number: 20210238396Abstract: There is provided a polymer composition using which a molded product having excellent balance between rigidity, wear resistance, viscoelastic properties, and heat resistance can be obtained. A polymer composition according to the disclosure includes (A) a conjugated diene rubber (where, a polymer corresponding to the following component (B) is excluded); and (B) a hydrogenated product of a polymer that satisfies the following (1) to (3), which is a polymer in which 80% or more of structural units derived from butadiene are hydrogenated: (1) being a copolymer of a conjugated diene compound containing butadiene and an aromatic vinyl compound, (2) including a polybutadiene block having a vinyl group content of 20% or less, and (3) including a block composed of a conjugated diene compound and an aromatic vinyl compound.Type: ApplicationFiled: January 29, 2021Publication date: August 5, 2021Applicant: JSR CORPORATIONInventors: Toshimitsu KIKUCHI, Takuya SANO, Hirofumi SENGA, Yuto Sakagami, Takato FUKUMOTO, Toshiyuki HAYAKAWA
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Patent number: 10961327Abstract: Provided is a rubber material that is well-balanced in terms of tensile strength, low hysteresis loss property, wet grip property, and abrasion resistance. A hydrogenated conjugated diene-based polymer which is a hydrogenation product of a conjugated diene-based polymer including butadiene-derived structural units is produced by a method comprising a step of preparing a conjugated diene-based polymer having, at a side chain moiety thereof, a functional group capable of interacting with silica; and a step of hydrogenating the conjugated diene-based polymer so as to achieve a hydrogenation rate of 80 to 99% of butadiene-derived structural units included in the conjugated diene-based polymer.Type: GrantFiled: September 6, 2016Date of Patent: March 30, 2021Assignee: JSR CORPORATIONInventors: Takumi Adachi, Hirofumi Senga, Fumihiro Toyokawa, Naoya Nosaka, Takaomi Matsumoto, Ryoji Tanaka
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Publication number: 20190062539Abstract: There is provided a hydrogenated conjugated diene-based rubber which can give a crosslinked rubber having high strength and excellent low fuel consumption performance and can give a rubber composition having excellent formability. A hydrogenated conjugated diene-based rubber having a hydrogenation rate of butadiene unit of 90% or more, wherein, in the molecular weight distribution of the hydrogenated conjugated diene-based rubber as determined by a gel permeation chromatographic method, when a peak area of a molecular weight of 1,000 to 250,000 is taken as AL and a peak area of a molecular weight of 250,000 or more is taken as AH, the ratio of AL to the total area of AL and AH is 0.5% to 20%.Type: ApplicationFiled: March 1, 2017Publication date: February 28, 2019Applicant: JSR CORPORATIONInventors: Takumi ADACHI, Hirofumi SENGA, Fumihiro TOYOKAWA
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Patent number: 10144820Abstract: A cross-linked rubber exhibits high strength and excellent abrasion resistance as compared with a known cross-linked rubber. The cross-linked rubber is obtained by cross-linking a rubber composition that includes a hydrogenated conjugated diene-based polymer, an olefin-based rubber, and a cross-linking agent, the hydrogenated conjugated diene-based polymer being a hydrogenated product of a polymer that includes a structural unit derived from butadiene, and including at least one of an amino group and a hydrocarbyloxysilyl group at one terminal or each terminal.Type: GrantFiled: May 4, 2017Date of Patent: December 4, 2018Assignee: JSR CORPORATIONInventors: Yukihiro Sawada, Hirofumi Senga, Shigeru Abe
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Patent number: 10125211Abstract: Provided is a tire member which is satisfactory in low fuel consumption performance and exhibits higher strength and more excellent abrasion resistance as compared with conventional ones. The tire member is a tire member obtained by subjecting a composition containing a hydrogenated conjugated diene polymer and a crosslinking agent to a crosslinking treatment, wherein the hydrogenated conjugated diene polymer is a hydrogenated product of a conjugated diene polymer that has a structural unit derived from butadiene and has a functional group at one end or both ends and the functional group is one or more groups selected from the group consisting of an amino group, an imino group, a pyridyl group, a phosphino group, a thiol group, and a hydrocarbyloxysilyl group.Type: GrantFiled: February 27, 2014Date of Patent: November 13, 2018Assignee: JSR CORPORATIONInventors: Naoya Nosaka, Shigeru Abe, Hirofumi Senga, Takumi Adachi, Ryoji Tanaka
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Publication number: 20180251576Abstract: Provided is a rubber material that is well-balanced in terms of tensile strength, low hysteresis loss property, wet grip property, and abrasion resistance. A hydrogenated conjugated diene-based polymer which is a hydrogenation product of a conjugated diene-based polymer including butadiene-derived structural units is produced by a method comprising a step of preparing a conjugated diene-based polymer having, at a side chain moiety thereof, a functional group capable of interacting with silica; and a step of hydrogenating the conjugated diene-based polymer so as to achieve a hydrogenation rate of 80 to 99% of butadiene-derived structural units included in the conjugated diene-based polymer.Type: ApplicationFiled: September 6, 2016Publication date: September 6, 2018Applicant: JSR CORPORATIONInventors: Takumi ADACHI, Hirofumi SENGA, Fumihiro TOYOKAWA, Naoya NOSAKA, Takaomi MATSUMOTO, Ryoji TANAKA
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Publication number: 20170233561Abstract: A cross-linked rubber exhibits high strength and excellent abrasion resistance as compared with a known cross-linked rubber. The cross-linked rubber is obtained by cross-linking a rubber composition that includes a hydrogenated conjugated diene-based polymer, an olefin-based rubber, and a cross-linking agent, the hydrogenated conjugated diene-based polymer being a hydrogenated product of a polymer that includes a structural unit derived from butadiene, and including at least one of an amino group and a hydrocarbyloxysilyl group at one terminal or each terminal.Type: ApplicationFiled: May 4, 2017Publication date: August 17, 2017Applicant: JSR CORPORATIONInventors: YUKIHIRO SAWADA, HIROFUMI SENGA, SHIGERU ABE
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Patent number: 9683095Abstract: A cross-linked rubber exhibits high strength and excellent abrasion resistance as compared with a known cross-linked rubber. The cross-linked rubber is obtained by cross-linking a rubber composition that includes a hydrogenated conjugated diene-based polymer, an olefin-based rubber, and a cross-linking agent, the hydrogenated conjugated diene-based polymer being a hydrogenated product of a polymer that includes a structural unit derived from butadiene, and including at least one of an amino group and a hydrocarbyloxysilyl group at one terminal or each terminal.Type: GrantFiled: October 29, 2014Date of Patent: June 20, 2017Assignee: JSR CORPORATIONInventors: Yukihiro Sawada, Hirofumi Senga, Shigeru Abe
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Patent number: 9676931Abstract: Provided is a polymer composition for use in the production of a crosslinked polymer having excellent tensile strength and abrasion resistance. A polymer composition comprising a polymer having multiple anionic functional groups and a polymer having multiple nitrogenated functional groups each represented by formula (1). The anionic functional groups are at least one group selected from a carboxy group, a sulfo group and a phosphate group. In one embodiment, each of the nitrogenated functional groups represented by formula (1) is bound to a structure derived from a conjugated diene compound or a structure derived from an aromatic vinyl compound.Type: GrantFiled: May 13, 2014Date of Patent: June 13, 2017Assignee: JSR CORPORATIONInventors: Hirofumi Senga, Naoya Nosaka, Shigeru Abe
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Publication number: 20160215127Abstract: A cross-linked rubber exhibits high strength and excellent abrasion resistance as compared with a known cross-linked rubber. The cross-linked rubber is obtained by cross-linking a rubber composition that includes a hydrogenated conjugated diene-based polymer, an olefin-based rubber, and a cross-linking agent, the hydrogenated conjugated diene-based polymer being a hydrogenated product of a polymer that includes a structural unit derived from butadiene, and including at least one of an amino group and a hydrocarbyloxysilyl group at one terminal or each terminal.Type: ApplicationFiled: October 29, 2014Publication date: July 28, 2016Applicant: JSR CORPORATIONInventors: Yukihiro SAWADA, Hirofumi SENGA, Shigeru ABE
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Publication number: 20160009911Abstract: Provided is a polymer composition for use in the production of a crosslinked polymer having excellent tensile strength and abrasion resistance. A polymer composition comprising a polymer having multiple anionic functional groups and a polymer having multiple nitrogenated functional groups each represented by formula (1). The anionic functional groups are at least one group selected from a carboxy group, a sulfo group and a phosphate group. In one embodiment, each of the nitrogenated functional groups represented by formula (1) is bound to a structure derived from a conjugated diene compound or a structure derived from an aromatic vinyl compound.Type: ApplicationFiled: May 13, 2014Publication date: January 14, 2016Applicant: JSR CORPORATIONInventors: Hirofumi SENGA, Naoya NOSAKA, Shigeru ABE