Compositions based on flexible and resilient poly(vinylidene fluoride), method for preparing same

The invention concerns compositions based on flexible and resilient poly(vinylidene fluoride), comprising for 100 parts by weight of a vinylidene fluoride (VF2) homopolymer (A) or a VF2 copolymer (A) and at least another monomer copolymerisable with VF2, wherein for 100 parts by weight of VF2 said monomer is present in an amount ranging between 0 and 30 parts by weight, 0.5 to 10 parts by weight of an elastomer B and 0.5 to 10 parts of a plasticizer C, with the additional condition that the sum of B plus C is from 1 to 10.5 parts by weight and, that the vinylidene fluoride homopolymer A is selected such that it has a flow index, measured according to the ISO 1133 standard, at 230 DEG C under a load of 5 kg, less than 5g/10 min and a critical modulus GC, measured at 190 DEG C, at the intersection of shearing moduli in molten state G' and G", ranging between 5 and 22 kPa. Generally, said compositions are suitable for producing objects, articles such as films, tube sheaths, pipes and the like subjected to stresses in high and/or low temperatures, in contact with particularly aggressive substances (such as hydrocarbons, strong acids, solvents, mineral or organic bases) where their resistance and flexibility are particularly required ( oil and gas industry, chemical engineering, building industry and public works).