| abstract |
The invention relates to a method for producing flame-resistant, non-corrosive and stable polyamide moulding compounds. The aim of the invention is to use a mixture of several components as non-corrosive flame retardants. Said mixture comprises, as component A) 20 - 98 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; R3 represents C1-C10-alkylene, linear or branched, C6-C10-arylene, C7-C20-alkylarylene or C7-C20-arylalkylene; M represents Mg, Ca, Al, 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 B) 1 - 80 wt.% of a salt of the phosphoric acid, having general formula (III) [HP(=O)O2]2-M m+, wherein M represents Mg, Ca, Al, Sb, Sn, Ge, Ti, Zn, Fe, Zr, Ce, Bi, Sr, Mn, Li, Na and/or K, as component C) 0.1 - 30 wt.% of an inorganic zinc compound, as component D) 0 - 30 wt.-% of a nitrogen-containing synergist and/or a phosphorous/nitrogen flame retardant, as component E) 0 - 3 wt.% of a phosphonite or a mixture of a phosphonite and a phosphite and as component F) 0 - 3 wt.-% of an ester or salt of long-chained aliphatic carboxylic acids (fatty acids), which comprise the typical chain lengths of C14 - C40, the total of the components always amounting to 100 wt.%. |