Abstract: A polyamide powder for use in a process of powder agglomeration by sintering, including at least one chain limiting agent. A process for preparing a powder including at least one chain limiting agent, wherein the chain limiter is mixed with the polyamide powder, and if need be at least one thioether antioxidant, by dry blending.

Abstract: The invention relates to a seeded particle of polyamide (PA) powder consisting of: a polyamide core with a D50 within the range from 15 to 60 ?m, and a polyamide shell, characterized in that the shell has an inherent viscosity in solution and a melting temperature which are respectively higher than those of the core.

Abstract: A powder intended for 3D printing, based on thermoplastic polymer, wherein it contains at least 0.1% by weight of at least one thioether antioxidant relative to the total weight of powder. Also, a process for stabilizing the color of a powder based on polymer in a 3D printing process, in which at least 0.1% by weight of at least one thioether antioxidant is incorporated relative to the total weight of powder.

Abstract: A sinterable magnetic powder composition including: from 50 to 95% of a powder magnet; and from 5 to 50% by weight of at least one thermoplastic polymer; for the total weight of the composition, said powder composition having a D50 comprised within the range of 0.1 to 100 ?m. And, to the use of the composition in processes used to agglomerate powders, layer by layer, by melting or sintering, for manufacturing three-dimensional magnetic objects.

Abstract: 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° C. and the boiling temperature Teb of said liquid; b) a step of homogenizing the mixture obtained in step a); c) a step of recovering powder isolated from the liquid.

Abstract: 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.

Abstract: The present invention relates to a thermoplastic powder composition with D50 lower than 100 ?m, including: at least one block copolymer having a inciting temperature lower than 180° C.; 15 to 50 wt % of at least one powdery filler having Mohs hardness lower than 6 and D50 lower than 20 ?m; and 0.1 to 5% of a powdery flow agent with D50 lower than 20 ?m, relative to the total weight of the composition. The present invention relates in particular to the use of said composition in methods for agglomerating powder, layer by layer, by melting or sintering, in order to manufacture flexible three-dimensional objects.

Abstract: The present invention relates to a method for preparing a recyclable polyimide powder, said method 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, said 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, said liquid being non-solvent for polyamide at a temperature between 5° C. and the boiling temperature Teb of said liquid; b) a step of homogenising the mixture obtained in step a); c) a step of recovering powder isolated from the liquid.

Abstract: 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.