Arkema France

Arnaud Lemaitre

Cyrille Mathieu

Frédéric Malet

Gregory Filou

Geoffroy Cammage

Emilie-Marie Soares Latour

Grégory Filou

The invention relates to a seeded particle of polyamide (PA) powder consisting of:

Particles of polyamide powders and use thereof in powder agglomeration processes

A method for preparing a recyclable polyamide powder, including the following consecutive steps: a) a step of adding 0.01 to 5 wt % of at least one antioxidant in powder form to a mixture including 20 to 95 wt % of polyamide powder and 5 to 80 wt % of liquid, relative to the weight of said mixture, the polyamide powder having a pH in the range from 3 to 8 and a yellowness index of less than 4, measured according to standard ASTM E 313-05, D1925, the liquid being a non-solvent for polyamide at a temperature between 5&#xb0; C. and the boiling temperature Tof said liquid; b) a step of homogenizing the mixture obtained in step a); c) a step of recovering powder isolated from the liquid.

Method for preparing a recyclable polyamide powder

The present invention relates to a method for increasing the recyclability of a polyamide in a sintering process, wherein at least 4000 ppm of at least one acid is incorporated in the polyamide, said acid being selected from: the acids of general formula HxPyOz in which x, y and z are integers selected in the range from 1 to 7, boric acid, the salts of these acids, their esters, their anhydrides and mixtures thereof.

Growing community of inventors

Saint-Martin Saint-Firmin, France

Arnaud Lemaitre