Abstract: Vulcanizable fluoroelastomer compositions having as base a copolymer of vinylidene fluoride (from 40 to 84 mol %) with perfluoropropene (15 to 30 mol %) and with tetrafluoroethylene (0.30 mol %) and containing a vulcanizing agent of the polyhydroxy compound type, an accelerator of the aminophosphinic compound type, metal oxides and/or hydroxides of basic character and an alkyl, cycloalkyl or aryl compound from the group of phosphoric esters, aminophosphoric esters, sulfoxides and sulfones.

Abstract: 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.

Abstract: Vulcanizable fluoroelastomer compositions based on vinylidene fluoride, comprising, as a vulcanizing system, a polyhydroxyl aromatic compound, a divalent metal compound of basic nature, and an accelerator consisting of a salt of ammonium or of phosphonium or of quaternary amino-phosphonium in which the anion is a complex of a Cd or Zn or Ni or Pb halide.

Abstract: A fluoroelastomer (A) based on vinylidene fluoride (40-83% by moles), perfluoropropene (15-35%) and tetrafluoroethylene (0%-30%) and a diamino compound (B), are mixed with a copolymer (C) containing tetrafluoroethylene (40%-60% by moles) and propylene (60-40%).The thus obtained mixture is covulcanizable with systems based on organic peroxides. In particular mixtures are employed, containing: (A)=42-70% by weight, (B)=1-4%, (C)=51-22%, peroxide 0.4-5%, triallylisocianurate 2-4%.

Abstract: Elastomeric compositions vulcanizable with peroxides, consisting of a fluoroelastomer based on vinylidene fluoride and containing small quantities of brominated or iodinated olefine as comonomer, admixed with from 1% to 25% by weight of perfluoropolyether or polycondensation derivatives thereof such as perfluoropolyamides.

Abstract: Vulcanization of fluoroelastomers based on vinylidene fluoride by means of a polyhydroxyl aromatic compound, a divalent metal compound of basic nature and an accelerator consisting of a salt of bis(triarylphosphin)-imidinium of general formula: ##STR1## wherein: n=1 or 2Ar=an aryl groupX=a mono- or divalent anion.

Abstract: There are disclosed vulcanizable compositions of vinylidene fluoride copolymer elastomers comprising, in addition to the elastomeric fluoride copolymer, an inorganic acid acceptor, a basic compound, a polyhydroxy or polythiol vulcanizing agent, and an aminophosphinic compound of the class of phosphoraneamine and phosphorimidic acid triamide. The presence of the aminophosphinic compound facilitates satisfactory vulcanization rates without scorching. The vulcanized fluorinated elastomers produced therefrom may be used as gaskets for sealing purposes and as protective layers in contact with corrosive chemical agent. They are particularly useful in applications requiring strong adhesion to metallic surfaces even under severe temperature conditions.

Abstract: Vulcanizable compositions of vinylidene fluoride copolymer elastomers, a process for the vulcanization thereof, and vulcanizates produced thereby. The vulcanizable compositions comprise, in addition to the elastomeric fluoride copolymer, an inorganic acid acceptor, a basic compound, a polyhydroxy or polythiol vulcanizing agent, and a phosphorus complex compound additive. The presence of the phosphorus complex additive facilitates satisfactory vulcanization rates without scorching. The vulcanized fluorinated elastomers produced therefrom may be used as gaskets for sealing purposes and as protective layers in contact with corrosive chemical agents. They are particularly useful in applications such as sealing gaskets requiring strong adhesion to metallic surfaces even under severe temperature conditions.