Patent ID: 7544752

Claim:
TFE-based thermoprocessable copolymers having the following composition, expressed in percentage by moles on the total of the monomers: A) from 0.01 to 15% of the monomer of formula: CF 2 ═CFOCF 2 OCF 3 (a); A1) tetrafluoroethylene from 99.99 to 85%; optionally B) one or more (per)fluorinated comonomers having at least one unsaturation of ethylene type, different from TFE; wherein when B) is present, the sum of the molar percentages of A1)+B) is within the limits above mentioned for A1), and the sum of the molar percentages A) +B) is such that the copolymers show at least one melting peak when analyzed by DSC analysis.