Thermoplastic halogenated polymer compositions, method for preparing same and use thereof

2- Polymer compositions according to claim 1, characterized by a content of insoluble polymer fractions (IF) of less than or equal to 20% by weight.

3- Polymer compositions according to claim 1 or 2, characterized in that they exhibit extensional hardening behaviour in the melt characterized by an exponential increase in the extensional viscosity as a faction of time.

4- Polymer compositions according to any one of the preceding claims, characterized in that the thermoplastic halogenated polymers are thermoplastic fluoropolymers.

5- Process for preparing thermoplastic halogenated polymer compositions, characterized in that one or more thermoplastic halogenated polymers are made to react in the melt, in an extruder, with a radical initiator and a coupling agent and in that the compositions obtained are discharged by the extruder.

6- Process according to claim 5, characterized in that the amount of radical initiator is from 0.5 to 10 g/kg of thermoplastic halogenated polymers.

7- Process according to either of claims 5 and 6, characterized in that the amount of coupling agent is from 0.5 to 50 g/kg of thermoplastic halogenated polymers.

8- Process according to any one of claims 5 to 7, characterized in that the coupling agent is chosen from the group formed by triallyl isocyanurate, divinylbenzene, vinyltrimethoxysilane and allyltriethoxysilane.

9- Process according to any one of claims 5 to 8, characterized in that the coupling agent is introduced before the radical initiator.

10- Use of the compositions according to any one of claims 1 to 4 or obtained by a process according to any one of claims 5 to 9 for the manufacture of films, sheets, panels, foamed tubing, tubes, pipes, foams, bottles or products that are thermoformed and/or moulded.

11- Use of the foamed tubing obtained from the compositions according to any one of claims 1 to 4 for the sheathing of power cables.