Phosphazenes useful as stabilizers in polymers

Claim 1

A phosphazene, substituted by piperidyl groups, of the formula (I) ##STR8## in which n is an integer from 3 to 100, R 1 and R 2 are identical or different and represent a group of the formulae (II), (III), or (IV) ##STR9## or represent, in addition to at least one of these groups, halogen, and in the formula (II) R 3 and R 4 are identical or different and represent hydrogen, C 1 - to C 18 -alkyl, C 5 - to C 12 -cycloalkyl, phenyl, which can be substituted by Cl, CH 3 O- or C 1 - to C 4 -alkyl, or C 7 - to C 9 -phenylalkyl or they denote a group of the formula (V) ##STR10## in which R 8 represents hydrogen or methyl and R 9 represents hydrogen, C 1 - to C 4 -alkyl which can be substituted by up to two OH groups, 2,3-epoxypropyl, allyl or benzyl, R 3 additionally represents C 3 - to C 21 -alkoxyalkyl or R 3 and R 4 together with the N atom linking them represent a pyrrolidine ring or a piperidine, morpholine or hexamethyleneimine ring which can also be substituted by up to 4 C 1 - to C 4 -alkyl groups, and in the formula (III) r, s and t are identical or different integers from 2 to 6, v represents an integer from 0 to 3, and R 6 and R 7 represent identical or different radicals R 5 or represent a group of the formula (V) and T has the meaning of a group of the formula (VI) ##STR11## in which R 8 and R 9 have the meanings indicated above, R 10 and R 11 are identical or different radicals having the meaning of R 3 and R 12 is a radical having the meaning of R 4 , and in the formula (IV) R 5 represents a radical R 4 or a group of the formula (VII) or (VIII), ##STR12## in which X represents 0 or NR 3 , with R 3 as indicated above and R 15 represents CH 3 , C 2 H 5 or a group of the formula (V), m is 0 or 1, T is a radical of the formula (VI), R 12 is C 2 - to C 6 -alkylene, R 13 is a radical R 4 or T and R 14 is a radical R 4 and the formula (I) must contain at least one group of the formula (V).