Method for preparing a recyclable polyamide powder
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United States of America Patent
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Aug 23, 2016
Grant Date -
Jan 3, 2013
app pub date -
Oct 18, 2010
filing date -
Oct 16, 2009
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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.
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