The present invention is at least 1. AB monomers; 2 -dicarboxylic acid (A 2 ) of at least one compound I; 3. trimethyl amine (B 3 ) of at least one compound II; And 4. Optionally, the monocarboxylic acid (A 1 ) made of a unit derived from a compound III, 5. diamine (B 2 ) of at least one compound IV and characterized also from the made of a derived unit , characterized in that the relative amounts n satisfies the following relationship of the compound , essentially gel- relates to the absence of , a randomly branched polyamide :
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