公开(公告)号：US20200157288A1

公开(公告)日：2020-05-21

申请号：US16750115

申请日：2020-01-23

Applicant: AGC Inc.

Inventor： Shigeru AIDA ,  Kaori ABE ,  Shintaro FUKUNAGA

IPC: C08J3/09 ,  C08F214/26 ,  C09D127/18

Abstract: Provided is a fluorine-containing copolymer composition capable of forming a uniform coating.The composition comprises a fluorine-containing copolymer having units derived from tetrafluoroethylene, units derived from ethylene, and 0.4 to 1.0 mol % of at least one functional group selected from the group consisting of a carbonyl group-containing group, an acid anhydride group, a carboxy group, a hydroxy group, an epoxy group, an amide group, an amino group, and an isocyanate group, and an aliphatic compound having 6 to 10 carbon atoms having one carbonyl group.

公开(公告)号：US20230357515A1

公开(公告)日：2023-11-09

申请号：US18352379

申请日：2023-07-14

Applicant: AGC Inc.

Inventor： Shinya HIGUCHI ,  Kaori ABE ,  Takehiro KOSE

IPC: C08J3/05 ,  C08F114/26

CPC classification number: C08J3/05 ,  C08F114/26 ,  C08J2327/18

Abstract: To provide a method for producing an aqueous polytetrafluoroethylene dispersion, whereby the formation of fluorinated oligomers as byproducts is minimized, CFT of the formed coating film is large, and a highly concentrated aqueous polytetrafluoroethylene dispersion is easily obtainable. The method for producing an aqueous polytetrafluoroethylene dispersion, which comprises step A1 of polymerizing a non-fluorinated monomer in an aqueous medium to obtain a solution 1 containing a polymer containing units based on the non-fluorinated monomer, step A2 of conducting polymerization of tetrafluoroethylene in the solution 1 without substantially adding a surfactant to the solution 1, to obtain an aqueous emulsion containing polytetrafluoroethylene particles, and step A3 of adding a nonionic surfactant to the aqueous emulsion at a rate of from 10 to 150 mass % to the mass of PTFE contained in the aqueous emulsion, and subsequently concentrating the aqueous emulsion to obtain an aqueous polytetrafluoroethylene dispersion, wherein the amount of the non-fluorinated monomer used, to the amount of the tetrafluoroethylene supplied to the polymerization system, is at most 200 mass ppm.