Flame-retardant polymer compositions containing amine salts

Abstract

Polymer compositions containing minor proportions of polyvalent metal or amine salts of 5,5-bis-(bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane. Aluminum, calcium and melamine salts are preferred.

We claim: 
     
       1. A composition comprising a normally flammable polymer and a minor porportion, sufficient to impart flame-retardant properties to said composition, of a salt of 5,5-bis (bromomethyl)-2-hydroxy-2-oxo-1,3,2-dioxaphosphorinane having the structure ##STR2## where A is a .[.polyvalent metal or.]. protonated amino-s-triazine group and n is an integer corresponding to the valence of A. .[. 
     
     
       2.  The composition of claim 1 wherein A is aluminum..]. .[.3. The composition of claim 1 wherein A is calcium..]. .[.4. The composition of claim 1 wherein the normally flammable polymer is a polymer of styrene..]. 
     
     
        . The composition of claim 1 wherein the normally flammable polymer is an olefin polymer. .[.6. The composition of claim 4 wherein the normally flammable polymer is an ABS resin..]. .[.7. The composition of claim 4 
     
     
        wherein the normally flammable polymer is polystyrene..]. 8. The composition of claim 5 wherein the normally flammable polymer is polypropylene.