| abstract |
This invention is that of a flame retardant additive composition for polymers comprising an ammonium or amine phosphate (50-95 %), a hydroxyalkyl isocyanurate (5-50 %) and a minor amount of polytetrafluoroethylene (0.3-9 %). Optionally, the flame retardant additive composition may contain as a fourth component, a blowing agent (5-40 %) such as urea, melamine, glycine etc. Preferred components are ammonium polyphosphate, tris-(2-hydroxyethyl) isocyanurate and polytetrafluoroethylene. The flame retardant additive composition may be used to impart flame retardancy to synthetic hydrocarbon polymers, in particular polypropylene and polyester - polyether copolymers wherein said additive is employed in an amount of about 5 to 50 percent based upon the total weight of polymer and additive. |