Synergistic flame-retardant combination for plastics.

摘要

Synergistic fire retardant combinations for thermoplastic polymers, comprise (A) salts of 1-hydroxy-dihydrophosphole oxides of formula (Ia) or (Ib) and/or 1-hydroxy-phospholane oxides of formula (II); and (B) nitrogen compounds of formula (III)-(VIII) or a mixture of these, in which R1-R4 = H or 1-12C alkyl; M = metal of Main or Sub Group 2 or 3; l = 1, 2 or 3; R5-R7 = H, 1-8C alkyl, alkoxy, acyl or acyloxy, 5-16C cycloalkyl or alkylcycloalkyl (possibly substituted with hydroxyl or 1-4C hydroxyalkyl), 2-8C alkenyl, 6-12C aryl or aralkyl, -OR8 or -NR8R9 (R8 and R9 not both hydrogen), N-alicyclic or N-aromatic groups; R8 = as for R5-R7, excepting OR8 and N-containing groups; R9-R13 = as for R8 plus -OR8; m, n = 1, 2, 3 or 4; X = an acid which can form adducts with triazines (III). Preferably, R1-R4 = H, methyl or ethyl; M = aluminium; R5-R7 = H or phenyl; R8 = H or 1-4C alkyl; and R9-R13 = phosphoric or cyanuric acid. Also claimed are flameproofed plastic moulding materials containing this combination.