Ausimont S.p.a.

Ausimont S.r.l.

Anna Minutillo

Graziella Chiodini

Vincenzo Arcella

Margherita Albano

Giulio Brinati

Michele Merenda

Attilio LaGostina

Graziell Chiodini

Ezio Montessoro

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 exhibiting high resistance to bases and alcohols, as well as high mechanical properties and low-temperature resistance, comprising, in moles:

Fluoroelastomers based on vinylidene fluoride exhibiting superior

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.

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Milan, Italy

Anna Minutillo