Patents Assigned to Japan Elastomer Co., Ltd.
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Patent number: 11248064Abstract: A conjugated diene polymer satisfying following conditions (1) to (4): (1) the conjugated diene polymer has two or more peaks in a molecular weight distribution curve obtained by measurement with gel permeation chromatography (GPC); (2) the molecular weight distribution curve contains a peak (A) having a peak molecular weight of 500,000 to 2,500,000 and a peak (B) having a peak molecular weight of 150,000 to 600,000; (3) a total value of an area of the peak (A) and an area of the peak (B) is 70% or more of a total area of the molecular weight distribution curve; and (4) an absolute value of difference between a glass transition temperature of a conjugated diene polymer in the peak (A) (Tg (A)) and a glass transition temperature of a conjugated diene polymer in the peak (B) (Tg (B)) is 2° C. to 30° C.Type: GrantFiled: February 7, 2018Date of Patent: February 15, 2022Assignees: Japan Elastomer Co., Ltd., Asahi Kasei Kabushiki KaishaInventors: Atsushi Yasumoto, Hideki Yamasaki
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Patent number: 10822446Abstract: A modified conjugated diene polymer satisfying the following conditions (I) to (IV): (I) at least two peaks are observed in a molecular weight distribution curve; (II) when a peak of the highest molecular weight is defined as a peak (B), a peak of the largest peak area except for the peak (B) is defined as a peak (T), a peak molecular weight of the peak (B) is from 500,000 to 2,500,000 and a peak molecular weight of the peak (T) is from 150,000 to 600,000; (III) an area of the peak (T) is from 30% to 80% and a total value of an area of the peak (B) and the area of the peak (T) is 65% or more; and (IV) a proportion of a modified polymer chain(s) in a region ranging from a low-molecular-weight side to a point of 5% cumulative area is from 60% to 99%.Type: GrantFiled: September 1, 2017Date of Patent: November 3, 2020Assignee: Japan Elastomer Co., Ltd.Inventors: Atsushi Yasumoto, Hideki Yamasaki
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Publication number: 20200024383Abstract: A modified conjugated diene polymer satisfying the following conditions (I) to (IV): (I) at least two peaks are observed in a molecular weight distribution curve; (II) when a peak of the highest molecular weight is defined as a peak (B), a peak of the largest peak area except for the peak (B) is defined as a peak (T), a peak molecular weight of the peak (B) is from 500,000 to 2,500,000 and a peak molecular weight of the peak (T) is from 150,000 to 600,000; (III) an area of the peak (T) is from 30% to 80% and a total value of an area of the peak (B) and the area of the peak (T) is 65% or more; and (IV) a proportion of a modified polymer chain(s) in a region ranging from a low-molecular-weight side to a point of 5% cumulative area is from 60% to 99%.Type: ApplicationFiled: September 1, 2017Publication date: January 23, 2020Applicant: Japan Elastomer Co., Ltd.Inventors: Atsushi Yasumoto, Hideki Yamasaki
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Publication number: 20200010579Abstract: A conjugated diene polymer satisfying following conditions (1) to (4): (1) the conjugated diene polymer has two or more peaks in a molecular weight distribution curve obtained by measurement with gel permeation chromatography (GPC); (2) the molecular weight distribution curve contains a peak (A) having a peak molecular weight of 500,000 to 2,500,000 and a peak (B) having a peak molecular weight of 150,000 to 600,000; (3) a total value of an area of the peak (A) and an area of the peak (B) is 70% or more of a total area of the molecular weight distribution curve; and (4) an absolute value of difference between a glass transition temperature of a conjugated diene polymer in the peak (A) (Tg (A)) and a glass transition temperature of a conjugated diene polymer in the peak (B) (Tg (B)) is 2° C. to 30° C.Type: ApplicationFiled: February 7, 2018Publication date: January 9, 2020Applicants: Japan Elastomer Co., Ltd., Asahi Kasei Kabushiki KaishaInventors: Atsushi Yasumoto, Hideki Yamasaki
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Patent number: 10472514Abstract: A block copolymer composition including: 10% by mass or more and 90% by mass or less of a component (a), and 10% by mass or more and 90% by mass or less of a component (b), wherein the component (a) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower; and the component (b) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit.Type: GrantFiled: January 22, 2015Date of Patent: November 12, 2019Assignees: Asahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.Inventors: Takahiro Hisasue, Shigeo Nakajima, Yoshifumi Araki, Yukinori Nakamichi
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Patent number: 10385243Abstract: Disclosure provides a block copolymer composition having 20% by mass or more and 90% by mass or less of a component (A) and 10% by mass or more and 80% by mass or less of a component (B), wherein the component (A) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 30,000 or higher and 190,000 or lower; and the component (B) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 60,000 or higher and 500,000 or lower.Type: GrantFiled: January 22, 2015Date of Patent: August 20, 2019Assignees: Asahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.Inventors: Kosuke Nakatani, Yoshifumi Araki, Kenta Shibuya, Takahiro Hisasue, Kazuo Moritou
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Publication number: 20190233546Abstract: The present invention provides a conjugated diene-based polymer containing at least one conjugated diene monomer, wherein 40% or more of the end thereof has an amino group and an amide group, and the indicator b* value of yellowness, as measured with a colorimetric color difference meter, is 15 or less.Type: ApplicationFiled: March 25, 2019Publication date: August 1, 2019Applicants: Japan Elastomer Co., Ltd., Asahi Kasei Kabushiki KaishaInventors: Hideki Yamasaki, Shouzou Akagi
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Patent number: 10316111Abstract: The present invention provides a conjugated diene-based polymer containing at least one conjugated diene monomer, wherein 40% or more of the end thereof has an amino group and an amide group, and the indicator b* value of yellowness, as measured with a colorimetric color difference meter, is 15 or less.Type: GrantFiled: June 1, 2015Date of Patent: June 11, 2019Assignees: Asahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.Inventors: Hideki Yamasaki, Shouzou Akagi
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Patent number: 10138368Abstract: A block copolymer composition including: 10% by mass or more and 90% by mass or less of a component (a), and 10% by mass or more and 90% by mass or less of a component (b), wherein the component (a) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower; and the component (b) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit.Type: GrantFiled: January 22, 2015Date of Patent: November 27, 2018Assignees: Asahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.Inventors: Takahiro Hisasue, Shigeo Nakajima, Yoshifumi Araki, Yukinori Nakamichi
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Publication number: 20170190805Abstract: The present invention provides a conjugated diene-based polymer containing at least one conjugated diene monomer, wherein 40% or more of the end thereof has an amino group and an amide group, and the indicator b* value of yellowness, as measured with a colorimetric color difference meter, is 15 or less.Type: ApplicationFiled: June 1, 2015Publication date: July 6, 2017Applicants: Japan Elastomer Co., Ltd., Asahi Kasei Kabushiki KaishaInventors: Hideki Yamasaki, Shouzou Akagi
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Publication number: 20170002190Abstract: A block copolymer composition including: 10% by mass or more and 90% by mass or less of a component (a), and 10% by mass or more and 90% by mass or less of a component (b), wherein the component (a) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit, wherein the block copolymer has a weight average molecular weight of 30,000 or higher and 150,000 or lower; and the component (b) is a block copolymer containing a polymer block (A) primarily including a vinyl aromatic monomer unit and a polymer block (B) primarily including a conjugated diene monomer unit.Type: ApplicationFiled: January 22, 2015Publication date: January 5, 2017Applicants: Asahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.Inventors: Takahiro Hisasue, Shigeo Nakajima, Yoshifumi Araki, Yukinori Nakamichi
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Publication number: 20160333235Abstract: Disclosure provides a block copolymer composition having 20% by mass or more and 90% by mass or less of a component (A) and 10% by mass or more and 80% by mass or less of a component (B), wherein the component (A) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 30,000 or higher and 190,000 or lower; and the component (B) is a block copolymer having a polymer block mainly comprising a vinyl aromatic monomer unit and a polymer block mainly comprising a conjugated diene monomer unit, and having a weight-average molecular weight of 60,000 or higher and 500,000 or lower.Type: ApplicationFiled: January 22, 2015Publication date: November 17, 2016Applicants: Asahi Kasei Kabushiki Kaisha, Japan Elastomer Co., Ltd.Inventors: Kosuke Nakatani, Yoshifumi Araki, Kenta Shibuya, Takahiro Hisasue, Kazuo Moritou
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Patent number: 9359537Abstract: It is an object to provide a block copolymer composition for a viscous adhesive, which will be a viscous adhesive composition excellent in balance of the adhesive properties such as tack strength and tackiness, having a low melt viscosity, and excellent solubility, coating properties, ejection stability, and surface skin quality. The block copolymer composition for a viscous adhesive having: a component (a) in an amount of 50 mass % or more and 90 mass % or less; and a component (b) in an amount of 10 mass % or more and 50 mass % or less; a content of the vinyl aromatic monomer unit being 25 to 50 mass %; a viscosity of the 15 mass % toluene solution being 10 to 40 mPa·s; and a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.Type: GrantFiled: July 18, 2013Date of Patent: June 7, 2016Assignees: Asahi Kasei Chemicals Corporation, Japan Elastomer Co., Ltd.Inventors: Shigeo Nakajima, Takahiro Hisasue, Kenji Ebara, Yukinori Nakamichi
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Publication number: 20150175855Abstract: It is an object to provide a block copolymer composition for a viscous adhesive, which will be a viscous adhesive composition excellent in balance of the adhesive properties such as tack strength and tackiness, having a low melt viscosity, and excellent solubility, coating properties, ejection stability, and surface skin quality. The block copolymer composition for a viscous adhesive having: a component (a) in an amount of 50 mass % or more and 90 mass % or less; and a component (b) in an amount of 10 mass % or more and 50 mass % or less; a content of the vinyl aromatic monomer unit being 25 to 50 mass %; a viscosity of the 15 mass % toluene solution being 10 to 40 mPa·s; and a number average molecular weight ratio of the component (b) to the component (a) being 2.0 to 4.0.Type: ApplicationFiled: July 18, 2013Publication date: June 25, 2015Applicants: Asahi Kasei Chemicals Corporation, Japan Elastomer Co., Ltd.Inventors: Shigeo Nakajima, Takahiro Hisasue, Kenji Ebara, Yukinori Nakamichi
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Patent number: 8563646Abstract: An adhesive composition having good balance in tackiness properties such as tack strength and retentivity, low melt viscosity, high processability, and high stability in melt viscosity under high temperature heating is provided. An adhesive composition containing two hydrogenated block copolymers and a predetermined tackifier is provided, the two hydrogenated block copolymers each having a different structure obtained by controlling the degree of hydrogenation of a block copolymer of a conjugated diene compound and a vinyl aromatic hydrocarbon in a particular range.Type: GrantFiled: April 10, 2009Date of Patent: October 22, 2013Assignees: Asahi Kasei Chemicals Corporation, Japan Elastomer Co., Ltd.Inventors: Shigeo Nakajima, Yukinori Nakamichi
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Patent number: 8039553Abstract: The present invention relates to an adhesive composition comprising (A) a block copolymer composition comprising a block copolymer (a) formed from at least two polymer blocks composed mainly of a monoalkenyl aromatic compound and at least one polymer block composed mainly of a conjugated diene compound and a block copolymer (b) formed from a polymer block composed mainly of a monoalkenyl aromatic compound and a polymer block composed mainly of a conjugated diene compound, wherein the block copolymer (a) has a GPC peak molecular weight of 60,000 to 110,000 in terms of standard polystyrene, the polymer block composed mainly of a monoalkenyl aromatic compound has a peak molecular weight of 10,000 to 30,000 and a molecular weight distribution Mw/Mn of 1.0 to 1.Type: GrantFiled: August 5, 2004Date of Patent: October 18, 2011Assignee: Japan Elastomer Co., Ltd.Inventors: Masahiro Fujiwara, Yukinori Nakamichi
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Publication number: 20110034614Abstract: An adhesive composition having good balance in tackiness properties such as tack strength and retentivity, low melt viscosity, high processability, and high stability in melt viscosity under high temperature heating is provided. An adhesive composition containing two hydrogenated block copolymers and a predetermined tackifier is provided, the two hydrogenated block copolymers each having a different structure obtained by controlling the degree of hydrogenation of a block copolymer of a conjugated diene compound and a vinyl aromatic hydrocarbon in a particular range.Type: ApplicationFiled: April 10, 2009Publication date: February 10, 2011Applicants: ASAHI KASEI CHEMICALS CORPORATION, JAPAN ELASTOMER CO., LTD.Inventors: Shigeo Nakajima, Yukinori Nakamichi
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Publication number: 20080009587Abstract: The present invention relates to an adhesive composition comprising (A) a block copolymer composition comprising a block copolymer (a) formed from at least two polymer blocks composed mainly of a monoalkenyl aromatic compound and at least one polymer block composed mainly of a conjugated diene compound and a block copolymer (b) formed from a polymer block composed mainly of a monoalkenyl aromatic compound and a polymer block composed mainly of a conjugated diene compound, wherein the block copolymer (a) has a GPC peak molecular weight of 60,000 to 110,000 in terms of standard polystyrene, the polymer block composed mainly of a monoalkenyl aromatic compound has a peak molecular weight of 10,000 to 30,000 and a molecular weight distribution Mw/Mn of 1.0 to 1.Type: ApplicationFiled: August 5, 2004Publication date: January 10, 2008Applicant: JAPAN ELASTOMER CO., LTD.Inventors: Masahiro Fujiwara, Yukinori Nakamichi
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Patent number: 7005469Abstract: The invention relates to: a modified rubber having a specific structure modified with a compound having two or more epoxy groups in the molecule; and a process for producing a modified rubber which includes copolymerizing a vinylaromatic hydrocarbon and a conjugated diene by the solution polymerization method using an organolithium as an initiator and modifying the resultant copolymer with a compound having two or more epoxy groups in the molecule. The invention further relates to a modified-rubber composition obtained by compounding a raw rubber containing the modified rubber with silica, and to rubber vibration isolators and a footwear article each obtained from the modified-rubber composition.Type: GrantFiled: February 14, 2002Date of Patent: February 28, 2006Assignee: Japan Elastomer Co., Ltd.Inventors: Hiroshi Fusamae, Keiichi Toda
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Patent number: 6833411Abstract: A subject for the invention is to provide an asphalt composition excellent in high-temperature storage stability and low-temperature characteristics and having an excellent balance among properties. Another subject is to provide a resin composition which has a reduced gel content, satisfactory appearance, and excellent balance among properties including impact resistance and is especially suitable for use as thin films such as food wrap films, films for laminating, and heat-shrinkable films or transparent sheet moldings such as trays for foods or for parts of light electrical appliances, etc., blister cases, or the like.Type: GrantFiled: April 11, 2003Date of Patent: December 21, 2004Assignee: Japan Elastomer Co., Ltd.Inventors: Masahiro Fujiwara, Yukinori Nakamichi