Solvay Specialty Polymers Italy S.p.a.

Alessandro Veneroni

Claudio Oldani

Luca Merlo

Elvira Pagano

Giulio Brinati

Alessandro Ghielmi

Valeriy Kapelyushko

Bradley Lane Kent

Martina Corasaniti

The invention relates to a process for the isolation of (per)fluorinated polymers containing sulfonyl fluoride functional groups from a polymerization latex. The process comprises adding the polymerization latex to an aqueous electrolyte solution under high shear stirring at a temperature equal to or lower than the glass transition temperature of the polymer. The invention further relates to the (per)fluorinated polymers containing sulfonyl fluoride functional groups isolated by the process and characterised by a loss of weight at 200&#xb0; C. lower than 1% as determined by thermogravimetric analysis.

Process for the isolation of sulfonyl fluoride polymers and polymers obtained therefrom

A process for reducing the amount of soluble polymeric fractions in a sulfonyl fluoride polymer. The process comprises contacting the sulfonyl fluoride polymer with a fluorinated fluid followed by separation of the polymer from the fluid. The fluorinated fluid is selected from hydrofluoroethers and hydrofluoropolyethers. The invention further relates to sulfonyl fluoride polymers obtainable by the process and having a heat of fusion not exceeding 4 J/g and containing less than 15% by weight of polymeric fractions having an average content of monomeric units comprising a sulfonyl functional group exceeding 24 mole %. The sulfonyl fluoride polymers so obtained are particularly suitable for the preparation of ionomeric membranes for use in electrochemical devices.

Process for the treatment of sulfonyl fluoride polymers

A process for manufacturing a dispersion of a vinylidene fluoride (VDF) thermoplastic polymer [polymer (F)], said process comprising polymerizing VDF in an aqueous phase comprising from 0.5 to 1.5 g/l of at least one surfactant of formula F&#x2014;(CFCF)&#x2014;CHCH&#x2014;SOX, wherein Xis H, a alkali metal or a NRgroup, with Rbeing H or a C-Chydrocarbon group [surfactant (T)] and an organic oxidizing agent [agent (O)] as polymerization initiator.

Method for polymerizng vinylidene fluoride

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Novate Milanese, Italy

Alessandro Veneroni