Polyamide composition prepared from a powder of polyamides to be recycled

A composition preparation method for preparing a polyamide composition which comprises the steps of:

• a) providing a mixture comprising:
• from 5 to 90% by weight of a virgin polyamide vPA;
• from 10 to 95% by weight of a polyamide to be recycled rPA;
• relative to the total weight of the mixture;
• the polyamide to be recycled rPA being in the form of an untransformed powder resulting from additive manufacturing by sintering or from a coating method by powdering or by electrostatic spraying, or of a powder obtained by grinding a polyamide-based part of an object to be recycled;
• the molecular weight-polydispersity index Ip (Mw/Mn) of the virgin polyamide vPA being lower than the polydispersity index Ip of the polyamide to be recycled rPA, where Mw and Mn are measured by steric exclusion chromatography in accordance with the standard ISO 16014-1 of 2012;
• b) kneading the said mixture in the molten state (melt kneading), as a result of which a polyamide composition is obtained whereof the molecular weight-polydispersity index Ip is greater than or equal to 1.5;
• c) recovering the said polyamide composition.