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US 11,952,441 B2Granted
Polytetrafluoroethylene production method
AssigneeDaikin Industries, Ltd.
InventorsTaketo Kato, Yohei Fujimoto, Kenji Ichikawa, Hiroyuki Sato, Yoshinori Nanba, Hirotoshi Yoshida, Kengo Ito, Chiaki Okui, Masamichi Sukegawa, Taku Yamanaka
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Abstract
A method for producing polytetrafluoroethylene, which includes polymerizing tetrafluoroethylene in an aqueous medium in the presence of a nucleating agent and a hydrocarbon anionic surfactant to obtain polytetrafluoroethylene. A total amount of the nucleating agent and the hydrocarbon anionic surfactant at the initiation of polymerization is more than 50 ppm based on the aqueous medium.
Claims12
A method for producing polytetrafluoroethylene comprising:
- polymerization of tetrafluoroethylene in an aqueous medium in the presence of a nucleating agent and a hydrocarbon anionic surfactant to obtain polytetrafluoroethylene particles,
- wherein a total amount of the nucleating agent and the hydrocarbon anionic surfactant at the initiation of polymerization is 60 ppm or more based on the aqueous medium, and
- wherein the nucleating agent is at least one selected from the group consisting of a fluoropolyether and a nonionic surfactant.
Dependencies are inferred from the claim text.