Flame retardant mixtures, the production and the use thereof

A flame retardant mixture comprising:

• 99.9999% to 75% by weight of diorganylphosphinic acid salt as component A);
• and
• 0.0001% to 13% by weight of iron in the form of an iron-containing substance B1) as component B), where the amount of B1) is 0.0001% to 25% by weight,
• where the sum total of A) and B1) is 100% by weight,
• wherein the diorganylphosphinic acid salts conform to the formula (II)
• wherein
• R1 and R2 are the same or different and are independently methyl, ethyl, n-propyl, isopropyl, butyl, n-butyl, tert-butyl, n-pentyl, 2-pentyl, 3 pentyl, 2-methylbutyl, 3-methylbutyl (isopentyl), 3-methylbut-2-yl, 2-methylbut-2-yl, 2,2-dimethylpropyl (neopentyl), hexyl, heptyl, octyl, nonyl, decyl, cyclopentyl, cyclopentylethyl, cyclohexyl, cyclohexylethyl, phenyl, phenylethyl, methylphenyl and/or methylphenylethyl,
• m is 1 to 4, and
• M is Mg, Ca, Al, Sb, Sn, Ge, Ti, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na and/or K,
• and wherein component B1) is present in the form of (a) iron(II) bis and/or iron(III) tris:
• -(diethylphosphinate), -(dipropylphosphinate), -(butylethylphosphinate), -(n-butylethylphosphinate), -(sec-butylethylphosphinate), -(hexylethylphosphinate), -(dibutylphosphinate), -(hexylbutylphosphinate), -(octylethylphosphinate), -(ethyl(cyclopentylethyl)phosphinate), -(butyl(cyclopentylethyl)phosphinate), -(ethyl(cyclohexylethyl)phosphinate), -(butyl(cyclohexylethyl)phosphinate), -(ethyl(phenylethyl)phosphinate), -(butyl(phenylethyl)phosphinate), -(ethyl(4-methylphenylethyl)phosphinate), -(butyl(4-methylphenylethyl)phosphinate), -(butylcyclopentylphosphinate), -(butylcyclohexylethylphosphinate), -(butylphenylphosphinate), -(ethyl(4-methylphenyl)phosphinate) and/or -(butyl(4-methylphenyl)phosphinate);
• (b) iron(II) mono and/or iron(III) mono:
• -(ethylphosphinate), -(propylphosphinate), -(butylphosphinate), -(n-butylphosphinate), -(sec-butylphosphinate), -(hexylphosphinate) and/or -(octylphosphinate);
• (c) iron(II) and/or iron(III):
• ethylphosphonate, propylphosphonate, butylphosphonate, n-butylphosphonate, sec-butylphosphonate, hexylphosphonate, octylphosphonate, and/or (d) iron(II) and/or iron(III) salts of:
• ethyl(cyclopentylethyl)phosphinic acid, butyl(cyclopentylethyl)phosphinic acid, ethyl(cyclohexylethyl)phosphinic acid, butyl(cyclohexylethyl)phosphinic acid, ethyl(phenylethyl)phosphinic acid, butyl(phenylethyl)phosphinic acid, ethyl(4-methylphenylethyl)phosphinic acid, ethylphenylphosphinic acid, butyl(4-methylphenylethyl)phosphinic acid, butylcyclopentylphosphinic acid, butylcyclohexylethylphosphinic acid, butylphenylphosphinic acid, ethyl(4-methylphenyl)phosphinic acid, butyl(4-methylphenyl)phosphinic acid, ethylphosphinylacetic acid and/or ethylphosphinylbutyric acid, hydroxymethyl(ethyl)ethylphosphinic acid, 1 hydroxy-1-methylpropylethylphosphinic acid, butyl ethylphosphonate, acylethylphosphonic anhydride, butylethylphosphonic acid, butylethylphosphinic acid, ethylphosphinylisobutyronitrile (1-cyano-1-methylethylethylphosphinic acid), propylethylphosphinic acid, t-butyl ethylphosphonate, t-butylethylphosphinic acid, hydroxymethyl(butyl)ethylphosphinic acid, 3-hydroxy-3-methylpentylethylphosphinic acid, propoxyethylethylphosphinic acid, phenylethylethylphosphinic acid, 2-ethylphosphinylethyl laurate, ethylpentylphosphinic acid, t-butoxyethylethylphosphinic acid, ethylphosphinylisohexanonitrile, hexylethylphosphinic acid and/or ethylphosphinylethyl sulfate.