| abstract |
Multilayer tube comprising, in its radial direction from the outside to the inside: * a layer (1) made of nylon-11 or nylon-12 polyamide; * an intermediate layer (2) comprising by weight, the total being 100%: - 50 to 100% of at least one polyamide A1 of formula X, Y / Z or 6, Y2 / Z wherein X represents residues of a aliphatic diamine having 6 to 10 carbon atoms, Y represents residues of an aliphatic dicarboxylic acid having 10 to 14 carbon atoms, Y2 represents residues of an aliphatic dicarboxylic acid having 15 to 20 carbon atoms, Z represents at least one unit chosen from: · residues of a lactam, · residues of an α, Ω-aminocarboxylic acid, and · a unit X1, Y1, wherein X1 represents residues of a diamine and Y1 represents residues of a diacid, being comprised the weight ratios Z / (X + Y + Z) and Z / (6 + Y2 + Z) between 0 and 15%, and - 0 to 50% of nylon-11 polyamide or nylon-12 polyamide; the successive layers being and adhering to each other without a coextrusion bonding layer, said layer (2) being the inner layer intended to be in contact with the transported fluid. |