Patent ID: 7767763

Claim:
VDF curable fluoroelastomers, having a glass transition temperature lower than −49° C. with the following composition (in percent by moles): A) from 25% to 50% of a monomer of formula: CF 2 ═CFOCF 2 OCF 3 (a); and B) one or more (per)fluorinated comonomers having at least one ethylene type unsaturation, in amounts from 75% to 50%; said comonomers comprising vinylidene fluoride (VDF) in amounts from 50% to 75% on the total of the monomer moles; the sum of the molar percentages of the monomers being 100%; the fluoroelastomers having an amount of —COF end polymer groups lower than 0.05 mmoles/Kg.