Patent ID: 9109082
Filing Date: 2015-08-18
Classification: B33Y,C08G,C08J,C08K,Y02W

Abstract:
1. A method for increasing the recyclability of a polyamide in a sintering process, comprising incorporating 4000 to less than 10,000 ppm of at least one acid in the polyamide, said acid being an acid of formula HxPyOz in which x, y and z are integers of 1 to 7, boric acid, or a salt, ester, anhydride of these acids or a mixture thereof wherein the acid is added during treatment of the polyamide with water by contacting the polyamide in solid state with water or steam containing the acid at a temperature near its crystallization temperature Tc for a sufficient time to effect the increase, then the water or steam is separated from the polyamide and the polyamide is dried.