Elf Atochem S.a.

Bruno Schlund

Alain Bouilloux

Thierry Pascal

The invention relates to felxible and tough poly(vinylidene fluoride)-based compositions. They comprise from 0.5 to 10 parts by weight of an elastomer B and from 0.5 to 10 parts by weight of a plasticizer C per 100 parts by weight of a homopolymer (A) of vinylidene fluoride (VF2) or of a copolymer (A) of VF2 and of at least one other monomer copolymerizable with VF2, in which the said monomer is present in an amount of between 0 and 30 parts by weight per 100 parts by weight of VF2 with the additional condition that the sum of B and C is from 1 to 10.5 parts by weight and, on the other hand, in that the homopolymer or the copolymer of vinylidene fluoride, A, is chosen in such a way that it has a melt flow index, measured according to the ISO 1133 standard at 230&deg; C. under a load of 5 kg, of less than 5 g/10 min and a critical modulus G , at the intersection of the melt shear moduli G&prime; and G&Prime; measured at 190&deg; C., of between 5 and 22 kPa. In general, they are suitable for producing objects and articles such as sheets, films, sleeves for tubes, pipes, etc., in contact with particularly aggressive substances (such as hydrocarbons, strong acids, solvents, inorganic and organic bases) during which their toughness and flexibility properties are particularly required. (Petroleum and oil industries, chemical engineering, building and civil engineering industries).

Flexible and tough poly(vinylidene fluoride)-based compositions and their method of preparation

Thermoplastic polyblend compositions, well suited for the production of mechanically strong and chemical-resistant shaped articles having a wide variety of chemical engineering and other applications, e.g., for the production of electrical cable for high-frequency electrical transmissions, comprise (i) a fluoropolymer, (ii) an aromatic polyester and (iii) a copolymeric compatibilizing agent therefor, the compatibilizing copolymer (iii) comprising the copolymerizate of ethylene, a glycidyl acrylate, an acrylic comonomer and, optionally, a peroxy comonomer.

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Chaponost, France

Bruno Schlund