Ausimont S.p.a.

Montedison S.p.a.

Montefluos S.p.a.

Piergiorgio Bonardelli

Giovanni Moggi

Vincenzo Arcella

Gerardo Caporiccio

Giulio Brinati

Graziella Chiodini

Gianna Cirillo

Giulio Tommasi

Enrico Monza

Claudio Monti

Stefano Conti

Alessandra Caratto

Process for the preparation of curable fluoroelastomers comprising reacting form 35 to 80 mol % of vinylidene fluoride, from 15 to 35 mol % of hexafluoropropene, from 0 to 30 mol % of another comonomer selected from fluoroolefins and/or perfluorovinyl ethers and from 0.01 to 1 mol % of a brominated fluorovinyl ether having general formula:

Process for the preparation of curable fluoroelastomers and products so

Double bonds in saturated fluoroelastomers consisting of copolymers of vinylidene fluoride with hexafluoropropene and/or chlorotrifluoroethylene, and optionally tetrafluoroethylene, are obtained by reacting the polymer in a solution of a water-insoluble solvent in the presence of an aqueous phase, an inorganic base, and a phase-transfer catalyst.

Process for preparing unsaturated fluoroelastomers

A process for preparing vinylidene fluoride homopolymers having low molecular weight and its copolymers by carrying out the polymerization in the presence of a radical initiator at a temperature ranging from 20.degree. to 160.degree. C. in a solvent of general formula R--COO--R.sub.1, wherein R is hydrogen or an alkyl radical having up to 4 carbon atoms and R.sub.1 is an alkyl radical with up to 5 carbon atoms.

Process for preparing vinylidene fluoride homopolymers and its copolymers

Fluoroelastomeric compositions based on vinylidene fluoride, having a high adhesion to metals in the vulcanized state, and characterized in that they contain small amounts of chlorotrifluoroethylene which is present as a comonomer of an elastomeric copolymer of vinylidene fluoride.

Fluoroelastomeric compositions based on vinylidene fluoride, containing

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Piergiorgio Bonardelli