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公开(公告)号：US12110758B2
公开(公告)日：2024-10-08
申请号：US18547246
申请日：2022-02-24
申请人： Kureha Corporation
IPC分类号： E21B33/129 , E21B33/126 , E21B33/128
CPC分类号： E21B33/1285 , E21B33/1265 , E21B33/129
摘要： A downhole tool securing device and a frac plug which are excellent in setting properties and water pressure resistance and have excellent fracturing properties. A downhole tool securing device (slips) of a frac plug according to one embodiment of the present invention includes a button containing a powder metallurgy material and having a compressive elastic modulus of at least 13.5 GPa and a toughness of 0.23 GJ/m3 or greater and 1.0 GJ/m3 or less.
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公开(公告)号：US20240322179A1
公开(公告)日：2024-09-26
申请号：US18262675
申请日：2022-01-25
申请人： Kureha Corporation
发明人： Haruki SAITO , Kayoko OKADA , Yasufumi IKEYAMA , Masataka KATONO
摘要： An object of the present application is to provide a binder for a non-aqueous electrolyte secondary battery having high adhesiveness to an active material and/or a current collector and also having high flexibility capable of withstanding bending in an electrode having a highly densified mixture layer. A binder for a non-aqueous electrolyte secondary battery, which achieves the object, contains: a vinylidene fluoride polymer having a vinylidene fluoride-derived structural unit as a main constituent component; and an additive having a specific structure, and a mass ratio of the vinylidene fluoride polymer to the additive is from 99/1 to 60/40:
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公开(公告)号：US20240279847A1
公开(公告)日：2024-08-22
申请号：US18566864
申请日：2022-05-20
申请人： KUREHA CORPORATION
CPC分类号： D01F6/60 , D01D5/0885 , D10B2331/02 , D10B2401/063 , D10B2507/00
摘要： To provide a monofilament of PA4, which has a low density. The monofilament of polyamide 4 in an embodiment of the present invention has a density of 1.230 g/cm3 or less. A method for producing a monofilament of polyamide 4 according to an embodiment of the present invention includes: melt-extruding polyamide 4; and cooling a melted and extruded matter of the polyamide 4 obtained by the melt-extruding process, at −10° ° C. or lower by using a nonpolar solvent.
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公开(公告)号：US20240271331A1
公开(公告)日：2024-08-15
申请号：US18566847
申请日：2022-05-20
申请人： Kureha Corporation
IPC分类号： D01F6/60
CPC分类号： D01F6/60
摘要： To provide a monofilament of polyamide 4 (PA4) having high tensile characteristics even when the monofilament is knotted. A monofilament of PA4, in a scattering vector in a range of 0.02 nm−1 or greater and 0.04 nm−1 or less measured by small-angle X-ray scattering, the monofilament having an average value of a ratio I2/I1 of a normalized scattering intensity I2 in an equatorial direction to a normalized scattering intensity I1 in a meridian direction of 5 or less. A birefringence of the monofilament is 50×10−3 or greater.
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公开(公告)号：US12044094B2
公开(公告)日：2024-07-23
申请号：US18247816
申请日：2021-10-11
申请人： KUREHA CORPORATION
发明人： Takuma Kobayashi
IPC分类号： E21B33/12 , E21B33/134
CPC分类号： E21B33/12 , E21B33/134
摘要： A plug that can maintain isolation also in a high-temperature and low salt concentration fluid or water only for a predetermined period of time is provided. A plug for temporarily preventing circulation of a fluid in a well includes or composed of a resin molded article, the resin molded article being formed from a polyglycolic acid resin composition containing a polyglycolic acid and a cyclic carbodiimide compound and having a carbodiimide group concentration of 15 eq/t or greater.
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公开(公告)号：US20240166847A1
公开(公告)日：2024-05-23
申请号：US18552360
申请日：2022-02-16
申请人： Kureha Corporation
IPC分类号： C08K5/1539 , C08G63/664 , C08G65/332 , C08G77/46
CPC分类号： C08K5/1539 , C08G63/664 , C08G65/3322 , C08G77/46 , C08G2230/00 , C08G2650/24 , C08G2650/58
摘要： To provide a glycolic acid copolymer composition that can be solidification- and extrusion-molded and that improves rate of decrease in thickness of the molded article during degradation. The glycolic acid copolymer composition according to an embodiment of the present invention includes a glycolic acid copolymer and a carboxylic anhydride, the glycolic acid copolymer including two or more straight macromolecular chains A, each containing a repeating unit derived from glycolic acid and being chemically bonded to a particular macromolecular chain B that is different from the macromolecular chain A, and a weight average molecular weight of the composition is 150000 or greater.
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公开(公告)号：US20240120492A1
公开(公告)日：2024-04-11
申请号：US18546202
申请日：2022-02-14
申请人： Kureha Corporation
发明人： Aya SHIKE , Yoshiyuki NAGASAWA , Tamito IGARASHI
IPC分类号： H01M4/62 , C08F214/22 , C08L27/16 , H01M4/13 , H01M10/0562
CPC分类号： H01M4/623 , C08F214/22 , C08L27/16 , H01M4/13 , H01M10/0562 , C08L2201/56 , C08L2203/20 , H01M2300/008
摘要： Provided are a binder solution, an electrode mixture, an electrode, and an all-solid-state battery, which use an organic solvent having low reactivity with a solid electrolyte and in which a binder easily dissolves. The binder solution for an all-solid-state battery contains: a binder made of a vinylidene fluoride polymer; and an organic solvent. The organic solvent is at least one selected from the group consisting of a cyclic ether, a ketone, and an ester. The organic solvent has a boiling point of 60° C. or higher and 160° C. or lower. A residual moisture content of the organic solvent is 300 ppm or less.
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公开(公告)号：US20240049723A1
公开(公告)日：2024-02-15
申请号：US18260434
申请日：2022-01-06
申请人： Kureha Corporation
摘要： The plant growth regulator according to an embodiment of the present invention contains an extract of an ergothioneine-producing microorganism as an active ingredient. The extract contains ergothioneine.
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公开(公告)号：US20240035352A1
公开(公告)日：2024-02-01
申请号：US18552344
申请日：2022-03-24
申请人： Kureha Corporation
IPC分类号： E21B33/12
CPC分类号： E21B33/1208
摘要： Provided is a molded product having small anisotropy of strength in a MD direction and a TD direction and a processed article thereof. A molded product (10) includes a glycolic acid polymer and a plurality of fibers (11). The fibers (11) include the fibers oriented in the MD direction and the fibers oriented in a direction along a tangent line to concentric circles in a cross-section orthogonal to the MD direction at a specific ratio.
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公开(公告)号：US20240010826A1
公开(公告)日：2024-01-11
申请号：US18254490
申请日：2021-11-25
申请人： Kureha Corporation
CPC分类号： C08L27/16 , C08K5/42 , H01M4/623 , H01M4/139 , C08L2201/52
摘要： An objective is to provide a vinylidene fluoride polymer composition that is difficult to swell and dissolve in N-methyl-2-pyrrolidone and can form an electrode with a smooth surface. The vinylidene fluoride polymer composition contains a vinylidene fluoride polymer with a melting point of 130° C. or higher. When the vinylidene fluoride polymer composition and N-methyl-2-pyrrolidone are mixed to prepare a vinylidene fluoride polymer dispersion with a content of the vinylidene fluoride polymer of 6 mass %, a ratio of a viscosity of the vinylidene fluoride polymer dispersion at 30° C. to a viscosity of N-methyl-2-pyrrolidone at 30° C. is 20 or less, and when the vinylidene fluoride polymer dispersion is stirred and then allowed to stand for 15 minutes, a rate of change in content of the vinylidene fluoride polymer in an upper 40 volume % area of the vinylidene fluoride polymer dispersion before and after the standing is 2 mass % or less.
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