| abstract |
The invention relates to thermoplastic compositions comprising a thermoplastic polyamide matrix and at least one additive for modifying the interaction of the matrix with an agent. The aim is to propose an additive for modifying the interaction, with respect to at least one agent, of a thermoplastic copolyamide matrix of the type such as copolyamides, the said additive: - consisting of at least one hyperbranched functionalized polymer - being incompatible with the matrix, - being capable of allowing the controlled modification of the interaction of the thermoplastic copolyamide, with respect to an internal or external chemical agent. Hyperbranched polymers that produce in the composition a reduction in the molar mass of the matrix M of greater than or equal to 7% relative to a control composition comprising a matrix M and free of hyperbranched polymer additive(s), the mass measurement preferably being performed according to a given protocol P, are preferably excluded. Applications: moulding, injection-moulding, injection blow-moulding, extrusion blow-moulding, extrusion or spinning. |