Flame-retardant composition, polymer composition comprising same and use thereof

Abstract

Disclosed are flame-retardant compositions comprising a) a compound comprising a N-oxyamine group, and b) a compound of formulae (II), (III) or (IV) wherein R1 and R2 independently from one another are hydrogen, C1-C6-alkyl, —P(O)(OR5)2, —P(O)OR5R6, —P(O)(R5)2, where R5 and R6 independently of one another are C1-C4-alkyl, C6-C12-aryl, C7-C15-aralkyl or C7-C15-alkaryl, or R1 and R2 taken together form an unsaturated cyclic ring, which is optionally substituted by an alkyl group; k is an integer from 1 to 2, Y is O or S, X is C1-C4-alkylene, C6-C12-arylene, C7-C15-aralkylene or C7-C15-alkarylene and n is 0, 1 or 2, or X is —O— or —NR7—, and n is 1, R7 is hydrogen or C1-C4-alkyl, R3 is C1-C4-alkylene, C6-C12-arylene, C7-C15-aralkylene or C7-C15-alkarylene, m is 0, 1 or 2, with the proviso that when X is —O— or —NR7— m is 1 or 2, R4 is C1-C4-alkylene, t is an integer from 1 to 2, and W is oxygen or sulphur. The compositions can be used as flame-retardants in polymer compositions which exhibit improved flame-retardancy.

Dependencies are inferred from the claim text.