公开(公告)号：US20230357467A1

公开(公告)日：2023-11-09

申请号：US18347932

申请日：2023-07-06

Applicant: AGC INC.

Inventor： Yuki ORITO ,  Shun WATANUKI

IPC: C08F210/02 ,  C08F2/38 ,  C08F214/26 ,  C08F2/06

CPC classification number: C08F214/26 ,  C08F2/06 ,  C08F2/38 ,  C08F210/02

Abstract: Provided is a method of producing a fluorine-containing copolymer, the method including carrying out solution polymerization using monomers including ethylene and tetrafluoroethylene, in a polymerization medium containing at least one polymerization solvent A selected from the group consisting of compounds represented by Formula 1 to Formula 4. Also provided is a fluorine-containing copolymer. Descriptions for Formula 1 to Formula 4 are omitted.

公开(公告)号：US20250026866A1

公开(公告)日：2025-01-23

申请号：US18901991

申请日：2024-09-30

Applicant: AGC Inc.

Inventor： Yuki ORITO ,  Shun WATANUKI

IPC: C08F2/18 ,  C08F210/02 ,  C08F214/26

Abstract: A method of producing a fluorine-containing copolymer includes performing suspension polymerization by using monomers including ethylene and tetrafluoroethylene in a polymerization medium including water and a polymerization solvent A that is not compatible with water and that is at least one kind selected from the group consisting of compounds represented by Formulae 1 to 3. In the method, the proportion of water to the polymerization medium is from 10% by volume to 80% by volume, the solubility of the polymerization solvent A to the water at 25° C. is 500 g/L or less, and the solubility of the water to the polymerization solvent A at 25° C. is 500 g/L or less. Descriptions regarding Formulae 1 to 3 are omitted.

公开(公告)号：US20240117088A1

公开(公告)日：2024-04-11

申请号：US18519169

申请日：2023-11-27

Applicant: AGC Inc.

Inventor： Kosuke SHIBASAKI ,  Yuki ORITO ,  Keiji HORI ,  Shintaro FUKUNAGA ,  Daisuke TAGUCHI

IPC: C08F214/26

CPC classification number: C08F214/265

Abstract: To provide a method for producing a fluorinated copolymer, whereby it is possible to efficiently produce a fluorinated copolymer in which coloration and foaming are suppressed during heating. A method for producing a fluorinated copolymer, comprising a step of producing a fluorinated copolymer by polymerizing tetrafluoroethylene and other monomer other than the tetrafluoroethylene in the presence of a hydroperoxide, at least one selected from the group consisting of a sulfite, a hydrogen sulfite, a dithionite, and a metabisulfite, at least one selected from the group consisting of an acidic substance and a substance that generates an acid by hydrolysis, and an aqueous medium.