Patent ID: 9421400
Filing Date: 2016-08-23
CPC Classification: A61K,A61Q,B33Y,C08J,C08K,Y10T

Claim Text:
1. A process for the preparation of a recyclable polyamide-based powder, said process comprising, successively, a) adding, at a temperature of 15 to 105° C., 0.01 to 5% by weight of at least one antioxidant in pulverulent form to a mixture comprising from 20 to 95% by weight of polyamide-based powder having a mean diameter by volume of 5 to 150 μm and from 5 to 80% by weight of liquid, with regard to the weight of said mixture, said polyamide-based powder of the mixture having a pH of 3 to 8 and a yellowness index of less than 4, measured according to standard ASTM E 313-05, D1925, said liquid comprising a hydrocarbon fraction, wherein the hydrocarbon fraction is an isoparaffin or a mixture of isoparaffins, n-paraffins or cycloparaffins, and being a nonsolvent for the polyamide at a temperature of between 5° C. and the boiling point B.p. of said liquid; b) homogenizing of the mixture obtained in a); and c) recovering recyclable powder isolated from the liquid.