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US 10,683,407 B2Granted
Process for preparing polyamide granules and uses
AssigneePolyTechnyl, SAS
InventorVirginie Thieblemont
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Abstract
The subject matter of the present invention is a process for preparing polyamide granules having heat-resistance properties, and also the use of these granules, in particular in the aid of the manufacture of yarns for airbags or for tyre cords. More specifically, the invention relates to a process for preparing polyamide granules having heat-resistance properties by wet impregnation of the granules with an aqueous solution comprising at least one heat stabilizer.
Claims11
A process for preparing polyamide granules with heat resistance properties, comprising:
- contacting the polyamide granules with a single aqueous solution comprising at least one heat stabilizer under a controlled atmosphere of inert gas, wherein the contacting is performed on stirred granules;
- wherein a total amount of an aqueous solution relative to the polyamide granules is less than or equal to 1% by weight;
- and
- wherein the heat stabilizer is a mixture of alkali metal or alkaline-earth metal halide and of copper halide;
- and
- subjecting the polyamide granules comprising the heat stabilizer to a solid-phase post-condensation step, without drying the polyamide granules before the solid-phase post-condensation step.
3 more elements
Dependencies are inferred from the claim text.