Flame-retardant polyamide composition

Abstract

The invention relates to a flame-retardant polyamide composition containing as component A) 1-96 wt.% of one or more thermoplastic polyamides, as component B) 2-25 wt.% of a dialkylphosphinic acid salt of formula (I) and/or a diphosphinic acid salt of formula (II) and/or polymers thereof, wherein R1, R2 are the same or different and C1-C6 alkyl are linear or branched or H, R3 represents linear or branched C1-C10 alkylene, C6-C10 alkylene, C7-C20 arylalkylene or C7-C20 arylalkylene; M represents Mg, Ca, AI, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na, K and/or a protonated nitrogen base; m is 1-4; n is 1-4; x is 1-4, as component C) 1-20 wt.% of a salt of the phosphoric acid, as component D) 1-20 wt.% of a phosphazene, as component E) 0-50 wt.% of a filling or reinforcing agent, as component F) 0-1 wt.% of a phosphonite or a mixture of phosphonite and a phosphite, and as component G) 0-1 wt.% of an ester or salt of long-chained aliphatic carboxylic acids (fatty acides), with the typical chain lengths of C14-C40, the total of the components always amounting to 100 wt.%.

Description

technical field [0001] The present invention relates to flame retardant polyamide compositions and molded articles comprising such flame retardant polyamide compositions. Background technique [0002] Many plastics are readily combustible due to their chemical makeup. In order to be able to meet the stringent flame retardancy requirements imposed by plastics processors and to some extent legislators, it is often necessary to equip plastics with flame retardants. Many different flame retardants and flame retardant synergists are known for this purpose and are also commercially available. Due to the more favorable side effects in the event of fire with regard to smoke density and smoke composition and from an ecological point of view, the use of non-halogenated flame retardant systems has been preferred for some time. [0003] Among non-halogenated flame retardants, especially for thermoplastic polymers, salts of phosphinic acid (phosphinates) have proven to be particularly ...

AI Technical Summary

Problems solved by technology

[0015] Especially in the case of the use of phosphorus-containing flame retardants in polyamides, the activity of the stabilizers described so far has proven to be insufficient, especially for the suppression of effects occurring during processing, such as discoloration and molecular weight reduction

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