Patent ID: 7144952

Claim:
A composition consisting essentially of: a thermoplastic fluorinated resin X 1 or several compatible thermoplastic resins X 1 to Xn, wherein at least one of X 1 to Xn is fluorinated, and at least one block (sequential) copolymer, n being an integer equal to or greater than 1, wherein: the block copolymer comprises at least three blocks A, B, and C, wherein each block is either a homopolymer or a copolymer obtained from two or more monomers, the A block is connected to the B block and the B block is connected to the C block by means of a covalent bond or of an intermediate molecule connected to one of these blocks via a covalent bond and to another block via another covalent bond, the A block is compatible with the thermoplastic resin or resins X 1 to Xn, the B block is incompatible with the thermoplastic resin or resins X 1 to Xn and incompatible with the A block, the C block is incompatible with the thermoplastic resin or resins X 1 to Xn, the A block and the B block; said composition comprising, by weight, at least 50% of the thermoplastic fluorinated resin(s), based on the total weight of fluorinated resin(s) and the block copolymer being at least one block copolymer with a number-average molecular mass (Mn) of greater than or equal to 20,000 g.mol−1 composed of: 20 to 93 parts by weight of A sequences, 5 to 50 parts by weight of B sequences, and 2 to 50 parts by weight of C sequences; and wherein said thermoplastic fluorinated resin(s) comprises poly(vinylidene difluoride) (PVDF) and said block copolymer is a poly(methyl methacrylate)-poly(butadiene)-poly(styrene) triblock copolymer.