Ausimont S.p.a.

Ausimont S.r.l.

Graziella Chiodini

Anna Minutillo

Vincenzo Arcella

Margherita Albano

Giulio Brinati

Giovanni Moggi

Gianna Cirillo

Sergio Geri

Michele Merenda

Piergiorgio Bonardelli

Attilio LaGostina

Ezio Montessoro

Stefano Conti

Curable flurooelastomeric compositions employable for preparing fuel hoses or O-rings for injectors comprising:

Curable fluoroelastomeric compositions

Curable flurooelastomeric compositions used for O-rings comprising:

Curable fluoroelastomeric compositions employable for preparing fuel hoses or O-rings for injectors comprising:

Fluoroelastomers endowed with high resistance to polar solvents and to

The emission of the highly toxic volatile products, such as methyl bromides or iodides, or ethyl bromides or iodides, during the cure with peroxides of fluoroelastomers containing bromine or iodine atoms is substantially reduced by adding to the cure mix small amounts of substances capable of combining with the radicals which give rise to the aforesaid toxic products, thereby preventing them from forming. This procedure does not sensibly affect the cure trend and results.

Fluoroelastomer compositions containing bromine and iodine in the

Ionically curing of VDF-containing fluoroelastomers selected from the ones containing less than 60 moles % of VDF and from the ones containing hydrogenated olefins is improved by using, as accelerators, triazinic compounds of formula: ##STR1## (R=H, C.sub.1 -C.sub.4 alkyl; R'=R or benzyl, arylalkyl; X=Cl, Br, I, a bisphenoxy radical or O--CH.sub.2 RF--CH.sub.2 R.sub.2 ; Rf=a perfluorooxyalkylene chain; R.sub.2 =--OH, --O.sup.-). What is claimed are the fluoroelastomeric compositions containing said accelerators.

Compositions of ionically curable fluoroelastomeric polymers

Additives for the cure with peroxides of fluoroelastomers containing

The invention relates to new fluoroelastomeric copolymers endowed with resistance to bases and suitable in particular for preparing O-rings, comprising:

Fluoroelastomeric and fluoroplastomeric copolymers having a high

Fluoroelastomeric copolymers, vulcanizable by ionic methods, suitable for the manufacture of 'shaft seals' and 'fuel hoses', comprising by weight:

Ionically vulcanizable fluoroelastomeric copolymers

Fluoroelastic copolymers, suitable for the manufacture of O-rings, comprising by weight:

Vinylidene fluoride based fluoroelastomeric copolymers modified with

There are described mixes, which are curable by using radical intermediates, are based on fluoroelastomers containing bromine or iodine, exhibit, during curing, a low emission of toxic vapors of methyl bromide or iodide and are characterized in that they contain, as cross-linking agents, peroxides having the following formulas: ##STR1## wherein the substitutents from R.sub.1 to R.sub.17 have the significances defined in the specification.

Curable mixes of fluoroelastomers containing bormine or iodine and of

Co-vulcanizable compositions comprising a fluoroelastomer (A) composed of from 40% to 85% by mol of vinylidene fluoride, from 15% to 35% by mol of perfluoropropene and from 0 to 30% by mol of tetrafluoroethylene; a copolymer (B) containing from 40% to 60% by mol of tetrafluoroethylene and from 40% to 60% by mol of propylene; and (C) a compound belonging to the class of bis-peroxydicarbamates.

Co-vulcanizable compositions of fluoroelastomers

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.

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Saronno, Italy

Graziella Chiodini