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US 2005/0038201 A1Published application
Process for increasing the molecular weight of polyamides
AssigneeDegussa AG
InventorsRoland Wursche, Andreas Dowe, Franz-Erich Baumann, Wilfried Bartz, Martin Himmelmann, Rainer Goring
Life of this patent
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Abstract
A process for condensing polyamides to increase their molecular weight, using a compound having at least two carbonate units comprises using a polyamide which, as a result of its preparation, comprises from 5 to 500 ppm of phosphorus in the form of an acidic compound, and adding, to the polyamide, from 0.001 to 10% by weight of a salt of a weak acid, thus eliminating the inhibiting action of the phosphorus compound.
Claims19
A process for condensing polyamides or polyamide molding compositions in order to increase the molecular weight thereof, comprising:
- adding to a polyamide or a polyamide molding composition containing from 5 to 500 ppm of phosphorus in the form of an acidic compound (a) from 0.005 to 10% by weight, based on the polyamide, of a compound having at least two carbonate units, and (b) from 0.001 to 10% by weight, based on the polyamide, of a salt of a weak acid.
Dependencies are inferred from the claim text.