Fire resistant polyamide compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert Valentine Kasowski, Marvin Michael Martens
Life of this patent
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Abstract
Disclosed herein are compositions containing an aliphatic polyamide, a selected tungstic acid or its salt, and a coagent such as melamine cyanurate. These compositions exhibit good fire resistance and good physical toughness, particularly good elongation, and are useful as molding resins. The reaction product of a tungstic acid and melamine may alternatively be incorporated.
Claims22
A composition comprising:
- (a) a synthetic, aliphatic polyamide;
- (b) about 0.1 to about 6 weight percent of a metallic tungstic acid salt or a complex oxide acid of tungsten and a metalloid;
- and
- (c) about 2 to about 6 percent by total weight of one or more coagents selected from the group consisting of melamine cyanurate, uracil, xanthine and oxamide;
- and wherein all percents by weight are based on the total weight of (a)+(b)+(c);
- and provided that (b) and (c) may be added as a preblended mixture or a preformed compound which is a reaction product of (b) and (c), so long as the final amounts of (b) and (c) in the claimed composition are within the ranges required of (b) and (c), respectively.
A composition comprising the product made by contacting in aqueous medium silicotungstic acid or phosphotungstic acid with melamine, wherein the molar ratio of said melamine to said silicotungstic acid or phosphotungstic acid is about 28:1 to about 1:1.
Dependencies are inferred from the claim text.