Self-extinguishing compositions of thermoplastic polymers

Claim 1

Self-extinguishing compositions of thermoplastic polymers comprising, in mixture, a thermoplastic polymer and a mixture of additives conferring self-extinguishing characteristics to the same polymer, formed by: ammonium phosphate or ammonium polyphosphate: ##STR22## wherein p varies within the range of from 1 to about 1000; and by: phosphorus-containing compounds definable by means of the general formulae: ##STR23## or mixtures thereof or condensation products thereof formed solely from condensation reactions among compounds of formula (IIa), of (IIb) or of (IIa) and (IIb), wherein R 1 is a group which is represented by the following formula: ##STR24## or a group which is represented by the following formula: ##STR25## wherein, in said (c) and (d) formulae: n varies within the range of from 1 to 5; R 4 , R 5 , R 6 are independently selected among hydrogen (up to a maximum of two hydrogen atoms), C 2 -C 6 alkyl or C 2 -C 6 hydroxyalkylene groups; or R 5 and R 6 , in (c) and (d) formulae, or R 4 and R 6 , limited to (c) formula, when considered jointly, can form a --(CH 2 ) m alkylene bridge, wherein m has such a value as to give rise to the formation of five-, or sixmembered ring structures or R 5 and R 6 , when considered jointly, can form a --CH 2 --CH 2 --O--CH 2 --CH 2 oxydiethylene bridge; R 2 and R 3 are the same as --OR 1 ; or they are selected among the following groups: ##STR26## wherein in said (e) and (f) formulae: R 7 is either hydrogen or a C 1 -C 6 alkyl group; R 8 and R 9 are groups independently selected among amino, hydroxy, C 1 -C 6 alkyl, C 1 -C 6 oxyalkyl and mono- and di-amino-C 1 -C 6 alkyl group; the additives (I) and (IIa) and/or (IIb) can moreover be present in overall amounts of from 20 to 35 parts by weight per each 100 parts by weight of thermoplastic polymer, the weight ratio between additive (I) and addtive (IIa) and/or additive (IIb) can moreover vary within the range of from 0.45/1 to 3.5/1.