公开(公告)号：US20240243291A1

公开(公告)日：2024-07-18

申请号：US18615055

申请日：2024-03-25

Applicant: KUREHA CORPORATION

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: H01M4/62 ,  H01M10/0565

CPC classification number: H01M4/623 ,  H01M10/0565

Abstract: A vinylidene fluoride copolymer composition having stable dispersibility in a dispersion medium over a long period of time, the composition having a melting temperature of 140° C. or lower, a reversing heat flow of the composition has endothermic peaks having an amount of enthalpy of fusion of 2 J/g or more, and an absolute value of a difference between a temperature showing a largest endothermic peak among the endothermic peaks and the melting temperature of the composition is 10° C. or lower. When a dispersion containing butyl butyrate and the vinylidene fluoride copolymer composition (vinylidene fluoride content rate of 10 mass %) is left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion after the dispersion is left to stand is 4.0 mass % or more and 10 mass % or less.

公开(公告)号：US20240301105A1

公开(公告)日：2024-09-12

申请号：US18254795

申请日：2021-11-25

Applicant: KUREHA CORPORATION

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: C08F214/22 ,  C08F214/28 ,  H01M4/62 ,  H01M10/056

CPC classification number: C08F214/22 ,  C08F214/28 ,  C08F2800/20 ,  H01M4/623 ,  H01M10/056

Abstract: A vinylidene fluoride copolymer composition having stable dispersibility in a dispersion medium over a long period of time, the composition having a melting temperature of 140° C. or lower, a reversing heat flow of the composition has endothermic peaks having an amount of enthalpy of fusion of 2 J/g or more, and an absolute value of a difference between a temperature showing a largest endothermic peak among the endothermic peaks and the melting temperature of the composition is 10° C. or lower. When a dispersion containing butyl butyrate and the vinylidene fluoride copolymer composition (vinylidene fluoride content rate of 10 mass %) is left to stand for 20 hours, a content rate of the vinylidene fluoride copolymer composition in an upper 20 vol % of the dispersion after the dispersion is left to stand is 4.0 mass % or more and 10 mass % or less.

公开(公告)号：US20240120492A1

公开(公告)日：2024-04-11

申请号：US18546202

申请日：2022-02-14

Applicant: Kureha Corporation

Inventor： Aya SHIKE ,  Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: H01M4/62 ,  C08F214/22 ,  C08L27/16 ,  H01M4/13 ,  H01M10/0562

CPC classification number: H01M4/623 ,  C08F214/22 ,  C08L27/16 ,  H01M4/13 ,  H01M10/0562 ,  C08L2201/56 ,  C08L2203/20 ,  H01M2300/008

Abstract: 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.

公开(公告)号：US20240010826A1

公开(公告)日：2024-01-11

申请号：US18254490

申请日：2021-11-25

Applicant: Kureha Corporation

Inventor： Takuya IKEDA ,  Tamito IGARASHI ,  Masataka KATONO ,  Kayoko OKADA ,  Yoshiyuki NAGASAWA

IPC: C08L27/16 ,  C08K5/42 ,  H01M4/62 ,  H01M4/139

CPC classification number: C08L27/16 ,  C08K5/42 ,  H01M4/623 ,  H01M4/139 ,  C08L2201/52

Abstract: 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.

公开(公告)号：US20180358626A1

公开(公告)日：2018-12-13

申请号：US16069197

申请日：2016-11-14

Applicant: Kureha Corporation

Inventor： Yoshiyuki NAGASAWA ,  Tamito IGARASHI

IPC: H01M4/62 ,  C08F214/22 ,  H01M4/133 ,  H01M10/0525

CPC classification number: H01M4/623 ,  C08F214/22 ,  C08F214/222 ,  C08F2800/20 ,  C08F2810/20 ,  C08L27/16 ,  H01M4/13 ,  H01M4/133 ,  H01M4/62 ,  H01M10/0525

Abstract: The present invention provides a binder composition which suppresses a swelling ratio in an electrolyte solution while having sufficient peel strength. The binder composition according to the present invention contains a copolymer including monomer units derived from vinylidene fluoride, a fluorine-containing alkyl vinyl compound, and a crosslinkable monomer; the content of the monomer unit derived from the fluorine-containing alkyl vinyl compound in the copolymer being not less than 2 mass % and less than 10 mass %; and the content of the monomer unit derived from the crosslinkable monomer being less than 5 mass %.

公开(公告)号：US20170306174A1

公开(公告)日：2017-10-26

申请号：US15643153

申请日：2017-07-06

Applicant: KUREHA CORPORATION

Inventor： Yusaku INABA ,  Tamito IGARASHI ,  Yuki SAKAI ,  Aya TAKEUCHI

IPC: C09D127/16 ,  C08K3/22 ,  C09D7/12 ,  H01M2/14 ,  H01M2/16 ,  H01M10/052

CPC classification number: C09D127/16 ,  C08K3/22 ,  C08K2003/2227 ,  C09D7/61 ,  H01M2/145 ,  H01M2/1646 ,  H01M2/1653 ,  H01M2/166 ,  H01M2/1673 ,  H01M2/1686 ,  H01M10/052 ,  H01M2220/20 ,  Y02E60/122 ,  Y02P70/54 ,  C08K3/00 ,  C08L27/16

Abstract: An object of the present invention is to provide a filler-containing resin film in which shedding of inorganic materials or the like is suppressed, a resin composition that can be used in production of the filler-containing resin film, and a method for producing the filler-containing resin film. The filler-containing resin film of the present invention is a filler-containing resin film comprising: a vinylidene fluoride copolymer obtained by copolymerizing vinylidene fluoride and a compound represented by formula (1) (in formula (1), R1, R2, and R3 are each independently hydrogen atoms, chlorine atoms, or alkyl groups having from 1 to 5 carbons; and X′ is an atomic group having a molecular weight of 472 or less and having a main chain configured from 1 to 19 atoms); and an insulating inorganic filler. The resin film is produced by applying onto a substrate and then drying a resin composition containing the vinylidene fluoride copolymer, the insulating inorganic filler, and an organic solvent.