| abstract |
Flame retardants are described, comprising (A) at least one metal or metalloid salt of a phosphonic acid of formula (I) wherein R is hydrogen, C 1 -C 18 alkyl, C 5 -C 6 cycloalkyl, C 2 -C 6 alkenyl, C 6 -C 10 aryl or C 7 -C 11 aralkyl and R′ is hydrogen, C 1 -C 8 alkyl, C 6 -C 10 aryl or C 7 -C 11 aralkyl, the substituents R and R′ that are other than hydrogen being unsubstituted or substituted by halogen, hydroxyl, amino, C 1 -C 4 alkylamino, di-C 1 -C 4 alkoxy, carboxy or C 2 -C 5 alkoxycarbonyl; and the metal or metalloid is one from Group IA, IB, IIA, IIB, IA, IVA, VA or VII of the Periodic Table; and (B) at least one flame retardant component based on a nitrogen compound, and also the use thereof in synthetic polymers. |