Solvay Specialty Polymers Italy S.p.a.

Stefana Musio

Valeriy Kapelyushko

Marco Malvasi

Serena Carella

Stefano Vincenzo Radice

Ivan Diego Wlassics

Marco Avataneo

Alessio Marrani

Bradley Lane Kent

Fiorenza D'Aprile

The present invention relates to a process for preparing a fluoropolymer in a liquid reaction medium, comprising the following steps:

Method for manufacturing fluoropolymers

A process for the preparation of perhaloacyl peroxides from perhaloacyl halides which is performed in the presence of a hydrofluoroether as the solvent.

Process for the preparation of perhaloacyl peroxides

The invention pertains to a method for making a fluoropolymer dispersion, said method comprising an aqueous emulsion polymerization of one or more fluorinated monomers wherein said aqueous emulsion polymerization is carried out in an aqueous medium comprising a surfactant mixture [mixture (S)] comprising: at least one perfluorohexanoic acid or salt thereof [surfactant (C6)], in an amount of 1 to 5 g/I, with respect to said aqueous medium; and at least one linear bifunctional perfluoropolyether surfactant [surfactant (PFPE)] complying with formula (I) here below: XpOOC&#x2014;CF-0-(CF0)(CFCF0)-CF&#x2014;COOXp (I) wherein: Xp, equal to or different from each other, is a hydrogen atom, a monovalent metal, preferably an alkaline metal, or an ammonium group of formula &#x2014;N(R'), wherein R&#x2032;, equal or different at each occurrence, is a hydrogen atom or a C-Chydrocarbon group, preferably an alkyl group; n&#x2032; and m&#x2032; are independently integers &#x3e;0 such that the number average molecular weight of the surfactant (PFPE) is of 500 to 2500, said surfactant (PFPE) being used in an amount of 0.005 to 0.5 g/I, with respect to said aqueous medium.

Method of making fluoropolymer dispersion

The invention pertains to a tetrafluoroethylene (TFE) copolymer comprising recurring units derived from at least one per(halo)fluoroolefin different from TFE [monomer (F)] [monomer (F)], in an amount of 0.005 to 0.250% moles, with respect to the total moles of the copolymer, wherein a particular relation between monomer content and amorphous index is satisfied, and to a process for its manufacture by emulsion polymerization in the presence of certain cyclic surfactants.

Tetrafluoroethylene copolymers

The invention pertains to a tetrafluoroethylene (TFE) copolymer comprising recurring units derived from at least one perfluoroalkyl(oxy)vinylether of formula CF&#x2550;CF&#x2014;O&#x2014;R, wherein Ris a C-Cperfluoroalkyl radical possibly comprising one or more ethereal oxygen atoms [monomer (F)], in an amount of 0.005 to 0.025% moles, with respect to the total moles of the copolymer, wherein a particular relation between monomer content and amorphous index is satisfied, and to a process for its manufacture by emulsion polymerization in the presence of certain cyclic surfactants.

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Alessandria, Italy

Stefana Musio