The present invention relates to a process for the melt preparation, in particular by reactive extrusion, of a co-polyamide block comprising at least one aliphatic polyamide block and at least one semi-aromatic block, in particular in which the aromatic group carries at least one hydroxyl function or sulfonate; the co-polyamide block obtainable by said process; a composition comprising the co-polyamide block; granules comprising such a co-polyamide or such a composition; a method of manufacturing an article to be part of a co-polyamide or a composition of said co-polyamide; and uses of the co-polyamide.
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