| abstract |
Fluoroelastomeric compositions comprising:n A) a fluoroelastomeric matrix based on vinylidene fluoriden(VDF); B) a semi-crystalline fluoropolymer, in an amount from 1 ton40% by weight based on the total of A) + B), comprisingna semi-crystalline fluoropolymer core coated by a semi-crystallinenfluoropolymer shell containing bromine and/orniodine in the polymer chain; nthe fluoroelastomer A) incorporates the fluoropolymer B), thenfluoropolymer B) being formed by tetrafluoroethylene (TFE)nhomopolymers, or by TFE copolymers with one or more monomersncontaining at least one unsaturation of ethylene type, thenaverage sizes of the semi-crystalline fluoropolymer particlesnbeing from 10 to 100 nm, preferably from 10 to 60 nm. |