Composition based upon a polyamide that is amorphous and transparent or has very low crystallinity, and upon a copolyamide with ether and amide units

Composition composed of a blend of:

• 60 to 99% by weight of a constituent polymer (A) formed from at least one
• (i) transparent homopolyamides and copolyamides:
• a) which are amorphous or which exhibit a crystallinity such that the enthalpy of fusion during the second heating of an ISO DSC (delta Hm(2)) is at most equal to 30 J/g, the weight being with respect to the amount of amide units present or of polyamide present, this melting corresponding to that of the amide units;
• b) which exhibit a glass transition temperature (Tg) of greater than 90° C.;
• and
• c) which are composed at least in part of cycloaliphatic and/or aromatic units,
• and/or (ii) alloys based on at least one abovementioned homopolyamide or copolyamide, the said alloys being amorphous or exhibiting a crystallinity corresponding to the same definition as above in (a);
• and
• 40 to 1% by weight of a constituent polymer (B) formed of at least one copolyamide based on ether units and on amide units;
• the constituent polymers (A)+(B) representing 100% by weight;
• wherein at least one from (A) and (B) may optionally further comprise at least one additive conventional for thermoplastic polymers and copolymers, wherein the content of the additive or additives in each of the constituent polymers (A) and (B) represents no more than 30% by weight of the said constituent polymer.