Fluorine-containing thermoplastic elastomer composition

A thermoplastic elastomer composition [composition (C)] comprising a continuous thermoplastic fluoropolymer phase and a dispersed fluoroelastomer phase, said composition comprising:

• a. at least one thermoplastic fluoropolymer [polymer (F)], said polymer (F) comprising:
• from 60% to 80% by moles of recurring units derived from tetrafluoroethylene (TFE),
• from 15% to 35% by moles of recurring units derived from vinylidene fluoride (VDF), and
• from 1% to 5% by moles of recurring units derived from at least one perfluoroalkylvinylether (PAVE) of formula (I):
• CF2═CF—O—Rf (I)
• wherein Rf is a C1-C6 alkyl group or a C1-C6 (per)fluoroalkyl group,
• wherein the molar amounts of said recurring units are relative to the total moles of recurring units in said polymer (F);
• and
• b. at least one (per)fluoroelastomer [elastomer (A)].

A thermoplastic elastomer vulcanizate composition [vulcanizate (V)], comprising a continuous thermoplastic fluoropolymer phase and a dispersed vulcanized fluoroelastomer phase, said composition comprising:

• a. at least one thermoplastic fluoropolymer [polymer (F)], said polymer (F) comprising:
• from 60% to 80% by moles of recurring units derived from tetrafluoroethylene (TFE),
• from 15% to 35% by moles of recurring units derived from vinylidene fluoride (VDF), and
• from 1% to 5% by moles, preferably from 1.5% to 3.5% by moles of recurring units derived from at least one perfluoroalkylvinylether (PAVE) of formula (I):
• CF2═CF—O—Rf (I)
• wherein Rf is a C1-C6 alkyl group or a C1-C6 (per)fluoroalkyl group,
• wherein the molar amounts of said recurring units are relative to the total moles of recurring units in said polymer (F);
• and
• b. at least one (per)fluoroelastomer [elastomer (A)].