Patents by Inventor Yusaku Kohinata
Yusaku Kohinata 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: 11932731Abstract: An aromatic polysulfone resin produced by the polycondensation of 4,4?-dihydroxydiphenylsulfone represented by chemical formula (S1) shown below and 2-(4-(4-hydroxyphenylsuIfonyl)phenoxy)-5-(4-hydroxyphenylsulfonyl)phenol represented by chemical formula (S2) shown below with 4,4?-dichlorodiphenylsulfone represented by chemical formula (S3) shown below. wherein hydrogen atoms in phenylene groups in formula (S1), formula (S2) and formula (S3) may be each independently substituted with an alkyl group, an aryl group or a halogen atom.Type: GrantFiled: December 23, 2019Date of Patent: March 19, 2024Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Patent number: 11891478Abstract: A liquid crystal polyester fiber includes a liquid crystal polyester having a tensile strength is 25 cN/dtex to 30 cN/dtex, and an orientation degree of the fiber is 94% to less than 100%. The liquid crystal polyester has repeating units of Formula (1), Formula (2), and Formula (3). At least one repeating unit of Formula (1), Formula (2), and Formula (3) contains 2,6-naphthylene. A content of the repeating unit containing the 2,6-naphthylene is 68 to 80 mol % with respect to a total content of all the repeating units. The liquid crystal polyester fiber has a fiber diameter of 5 to 100 ?m; (1) —O—Ar1—CO—, (2) —CO—Ar2—CO—, and (3) —X—Ar3—Y—, wherein Ar1 represents phenylene, naphthylene, or biphenylylene, Ar2 and Ar3 each independently represent phenylene, naphthylene, or biphenylylene, Ar1, Ar2, or Ar3 contains 2,6-naphthylene, X and Y independently represent oxygen or —NH—, and Ar1, Ar2, or Ar3 may be substituted.Type: GrantFiled: August 30, 2021Date of Patent: February 6, 2024Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Patent number: 11578208Abstract: An aromatic polysulfone resin having a repeating unit represented by Formula (I) and a repeating unit represented by Formula (II), in which a ratio (m:n) of a molar content (m) of the repeating unit represented by Formula (I) to a molar content (n) of the repeating unit represented by Formula (II) is 1:2,000 to 1:200. wherein hydrogen atoms of phenylene groups of Formulae (I) and (II) may be each independently substituted with an alkyl group, an aryl group, or a halogen atom.Type: GrantFiled: November 29, 2018Date of Patent: February 14, 2023Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Patent number: 11530323Abstract: An epoxy resin composition including components (A), (B), (C) and (D); wherein a content of the component (A) is 60 to 90 parts by mass, and a content of the component (B) is 10 to 40 parts by mass, with respect to epoxy resins; the epoxy resin composition has a characteristic that, when cured and formed into a cured product, the cured product has a glass transition temperature of 200° C. or higher; and a viscosity at 100° C. of the resin composition is 5 to 35 Pa·s, wherein Component (A) is an aromatic epoxy resin having at least 3 glycidyl groups in one molecule, Component (B) is an aromatic epoxy resin having two glycidyl groups in one molecule, Component (C) is an aromatic polysulfone resin having a reduced viscosity of 0.18 to 0.30 dl/g; and Component (D) is an aromatic amine compound.Type: GrantFiled: June 18, 2019Date of Patent: December 20, 2022Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Patent number: 11370881Abstract: A liquid crystal polyester fibers containing a liquid crystal polyester, in which the liquid crystal polyester has repeating units represented by Formulae (1), (2) and (3), at least one of the repeating units contains 2,6-naphthylene, a content of the repeating unit containing the 2,6-naphthylene is 40 mol% or greater with respect to a total content of all the repeating units, and an orientation degree of the liquid crystal polyester in a length direction of the fiber is 89% to 95%: —O—Ar1—CO—??(1), —CO—Ar2—CO—??(2), and —X—Ar3—Y—??(3), wherein Ar1 represents phenylene, naphthylene, or biphenylylene, Ar2 and Ar3 each independently represent phenylene, naphthylene, or biphenylylene, and at least one of Ar1, Ar2, and Ar3 contains 2,6-naphthylene, X and Y each independently represent oxygen or —NH—, Ar1, Ar2, or Ar3 may be each independently substituted with halogen, alkyl, or aryl.Type: GrantFiled: January 8, 2019Date of Patent: June 28, 2022Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Publication number: 20220073682Abstract: An aromatic polysulfone resin produced by the polycondensation of 4,4?-dihydroxydiphenylsulfone represented by chemical formula (S1) shown below and 2-(4-(4-hydroxyphenylsuIfonyl)phenoxy)-5-(4-hydroxyphenylsulfonyl)phenol represented by chemical formula (S2) shown below with 4,4?-dichlorodiphenylsulfone represented by chemical formula (S3) shown below. wherein hydrogen atoms in phenylene groups in formula (S1), formula (S2) and formula (S3) may be each independently substituted with an alkyl group, an aryl group or a halogen atom.Type: ApplicationFiled: December 23, 2019Publication date: March 10, 2022Inventor: Yusaku KOHINATA
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Patent number: 11268221Abstract: A nonwoven fabric including fibers formed from a thermoplastic resin is provided. The thermoplastic resin is an aromatic polysulfone resin. An average fiber diameter of the fibers is 3 ?m or more and 8 ?m or less. A basis weight is 5 g/m2 or more and 30 g/m2 or less.Type: GrantFiled: February 21, 2018Date of Patent: March 8, 2022Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Publication number: 20210388157Abstract: Liquid crystal polyester fibers containing a liquid crystal polyester, in which the liquid crystal polyester has a repeating unit represented by Formula (1), a repeating unit represented by Formula (2), and a repeating unit represented by Formula (3), at least one repeating unit selected from the group consisting of the repeating unit represented by Formula (1), the repeating unit represented by Formula (2), and the repeating unit represented by Formula (3) contains a 2,6-naphthylene group, a content of the repeating unit containing the 2,6-naphthylene group is 40 mol % or greater with respect to a total content of all the repeating units of the liquid crystal polyester, and an orientation degree of the liquid crystal polyester in a length direction of the fiber is 89% to 95%.Type: ApplicationFiled: August 30, 2021Publication date: December 16, 2021Inventor: Yusaku KOHINATA
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Patent number: 11174573Abstract: A method for producing a nonwoven fabric is provided. The method includes spinning a molten aromatic polysulfone resin from a nozzle and extending it with a high temperature fluid ejected at high speed, thereby obtaining the aromatic polysulfone resin in a fibrous form, and collecting the aromatic polysulfone resin obtained in a fibrous form on a moving collecting member. The aromatic polysulfone resin has a melt mass flow rate of 130 g/10 min or more under conditions of a test temperature of 400° C. and a nominal load of 2.16 kg, which is determined based on ASTM D 1238. A distance from the nozzle to the collecting member is set to 30 mm or less.Type: GrantFiled: February 21, 2018Date of Patent: November 16, 2021Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Patent number: 11104771Abstract: A resin film having an aromatic polysulfone as a forming material is provided. The resin film has a thickness of less than 100 ?m, and further contains an organic compound having a boiling point no lower than 250° C. and no higher than 400° C. The organic compound is contained in an amount of at least 500 ppm and at most 4000 ppm relative to the mass of the aromatic polysulfone.Type: GrantFiled: February 9, 2017Date of Patent: August 31, 2021Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yusaku Kohinata, Kazuyuki Ito
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Publication number: 20210261769Abstract: An epoxy resin composition including components (A), (B), (C) and (D); wherein a content of the component (A) is 60 to 90 parts by mass, and a content of the component (B) is 10 to 40 parts by mass, with respect to epoxy resins; the epoxy resin composition has a characteristic that, when cured and formed into a cured product, the cured product has a glass transition temperature of 200° C. or higher; and a viscosity at 100° C. of the resin composition is 5 to 35 Pa·s, wherein Component (A) is an aromatic epoxy resin having at least 3 glycidyl groups in one molecule, Component (B) is an aromatic epoxy resin having two glycidyl groups in one molecule, Component (C) is an aromatic polysulfone resin having a reduced viscosity of 0.18 to 0.30 dl/g; and Component (D) is an aromatic amine compound.Type: ApplicationFiled: June 18, 2019Publication date: August 26, 2021Inventor: Yusaku KOHINATA
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Publication number: 20210061948Abstract: Liquid crystal polyester fibers containing a liquid crystal polyester, in which the liquid crystal polyester has a repeating unit represented by Formula (1), a repeating unit represented by Formula (2), and a repeating unit represented by Formula (3), at least one repeating unit selected from the group consisting of the repeating unit represented by Formula (1), the repeating unit represented by Formula (2), and the repeating unit represented by Formula (3) contains a 2,6-naphthylene group, a content of the repeating unit containing the 2,6-naphthylene group is 40 mol % or greater with respect to a total content of all the repeating units of the liquid crystal polyester, and an orientation degree of the liquid crystal polyester in a length direction of the fiber is 89% to 95%.Type: ApplicationFiled: January 8, 2019Publication date: March 4, 2021Inventor: Yusaku KOHINATA
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Publication number: 20210061997Abstract: An aromatic polysulfone resin having a repeating unit represented by Formula (I) and a repeating unit represented by Formula (II), in which a ratio (m:n) of a molar content (m) of the repeating unit represented by Formula (I) to a molar content (n) of the repeating unit represented by Formula (II) is 1:2,000 to 1:200. wherein hydrogen atoms of phenylene groups of Formulae (I) and (II) may be each independently substituted with an alkyl group, an aryl group, or a halogen atom.Type: ApplicationFiled: November 29, 2018Publication date: March 4, 2021Inventor: Yusaku KOHINATA
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Patent number: 10676573Abstract: An aromatic polysulfone resin having a yellowness index of 50 or higher and a weight average molecular weight of 25,000 to 45,000 is provided.Type: GrantFiled: December 6, 2016Date of Patent: June 9, 2020Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventor: Yusaku Kohinata
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Publication number: 20200165395Abstract: A resin film having an aromatic polysulfone as a forming material is provided. The resin film has a thickness of less than 100 ?m, and further contains an organic compound having a boiling point no lower than 250° C. and no higher than 400° C. The organic compound is contained in an amount of at least 500 ppm and at most 4000 ppm relative to the mass of the aromatic polysulfone.Type: ApplicationFiled: February 9, 2017Publication date: May 28, 2020Applicant: Sumitomo Chemical company, LimitedInventors: Yusaku KOHINATA, Kazuyuki ITO
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Publication number: 20190390381Abstract: A nonwoven fabric including fibers formed from a thermoplastic resin is provided. The thermoplastic resin is an aromatic polysulfone resin. An average fiber diameter of the fibers is 3 ?m or more and 8 ?m or less. A basis weight is 5 g/m2 or more and 30 g/m2 or less.Type: ApplicationFiled: February 21, 2018Publication date: December 26, 2019Inventor: Yusaku KOHINATA
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Publication number: 20190382923Abstract: A method for producing a nonwoven fabric is provided. The method includes spinning a molten aromatic polysulfone resin from a nozzle and extending it with a high temperature fluid ejected at high speed, thereby obtaining the aromatic polysulfone resin in a fibrous form, and collecting the aromatic polysulfone resin obtained in a fibrous form on a moving collecting member. The aromatic polysulfone resin has a melt mass flow rate of 130 g/10 min or more under conditions of a test temperature of 400° C. and a nominal load of 2.16 kg, which is determined based on ASTM D 1238. A distance from the nozzle to the collecting member is set to 30 mm or less.Type: ApplicationFiled: February 21, 2018Publication date: December 19, 2019Inventor: Yusaku KOHINATA
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Publication number: 20180371171Abstract: An aromatic polysulfone resin having a yellowness index of 50 or higher and a weight average molecular weight of 25,000 to 45,000 is provided.Type: ApplicationFiled: December 6, 2016Publication date: December 27, 2018Applicant: Sumitomo Chemical Company, LimitedInventor: Yusaku KOHINATA
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Patent number: 9587112Abstract: According to the present invention, an aromatic polysulfone resin is offered which is suitable as film material, especially in porous membranes. The aromatic polysulfone resin of the present invention has a reduced viscosity of 0.55-0.65 dL/g, and preferably 0.58-0.62 dL/g, number average molecular weight (Mn) of 22000 or more, and preferably 23500 or more, and a value of the ratio of weight average molecular weight (Mw) relative to number average molecular weight (Mn) of 2.54 or less, and preferably 2.50 or less.Type: GrantFiled: September 14, 2010Date of Patent: March 7, 2017Assignee: SUMITOMO CHEMICAL COMPANY, LIMITEDInventors: Yusaku Kohinata, Hiroshi Harada
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Patent number: 8759474Abstract: Disclosed is a method for producing a liquid crystal polyester, which includes the steps of: (1) polycondensing a mixture of 70.5 to 71.5 mol % of a compound represented by the defined formula (I) (for example, 4-acetoxybenzoic acid) with 28.5 to 29.5 mol % of a compound represented by the defined formula (II) (for example, 6-acetoxy-2-naphthoic acid) to form a prepolymer, wherein the prepolymer has a flow initiation temperature of 200° C. or higher, and the mixture is polycondensed until reaching the temperature which is at least 30° C. lower than the polycondensation temperature; (2) removing the prepolymer in a molten state, followed by solidification and further grinding to produce prepolymer particles; and (3) subjecting the prepolymer particles to a heat treatment at 200 to 310° C. under circulation of an inert gas while remaining in a solid phase state.Type: GrantFiled: March 23, 2012Date of Patent: June 24, 2014Assignee: Sumitomo Chemical Company, LimitedInventors: Shinji Ohtomo, Yusaku Kohinata, Hidehiro Kotaka