	US 12,365,747 B2
	Method for manufacturing fluoropolymers
Stefana Musio, Saronno (IT); Fiorenza D'aprile, Nova Milanese (IT); Serena Carella, Parabiago (IT); Valeriy Kapelyushko, Alessandria (IT); Bradley Lane Kent, Woolwich Township, NJ (US); and Alessio Marrani, Lecco (IT)
Assigned to SOLVAY SPECIALTY POLYMERS ITALY S.p.A., Bollate (Milano) (IT)
Appl. No. 17/784,965
Filed by SOLVAY SPECIALTY POLYMERS ITALY S.P.A., Bollate (IT)
PCT Filed Dec. 9, 2020, PCT No. PCT/EP2020/085365 § 371(c)(1), (2) Date Jun. 13, 2022, PCT Pub. No. WO2021/116222, PCT Pub. Date Jun. 17, 2021.
Claims priority of provisional application 62/947,318, filed on Dec. 12, 2019.
Claims priority of application No. 20153524 (EP), filed on Jan. 24, 2020.
Prior Publication US 2023/0002518 A1, Jan. 5, 2023
Int. Cl. C08F 4/40 (2006.01); C08F 14/24 (2006.01); C08F 210/02 (2006.01); C08F 214/24 (2006.01); C08F 214/26 (2006.01)

CPC C08F 14/24 (2013.01) [C08F 4/40 (2013.01); C08F 210/02 (2013.01); C08F 214/245 (2013.01); C08F 214/265 (2013.01)]

14 Claims

1. A process for preparing a fluoropolymer in an aqueous reaction medium, said process comprising the following steps:

providing a reactor containing a liquid reaction medium comprising water,

introducing in said reactor ethylene monomers and fluorinated monomers, said fluorinated monomers being selected from tetrafluoroethylene (TFE), chlorotrifluoroethylene (CTFE) or mixtures thereof,

pressurizing the reactor,

initiating polymerization feeding into said reactor a redox initiator comprising an oxidising agent and a reducing agent, wherein said reducing agent in said redox initiator is free from sulphur atoms having an oxidation number of 4 or below,

wherein the reaction medium is free of fluorinated surfactants.