Two novel Intumescent fire retardants have been prepared which are thermally stable enough for processing in thermoplastics. They were synthesized from pentaerythritol, melamine, and phosphorus oxychloride and were found to be effective in fire-retarding polypropylene at levels of 20% or higher. Compared to the standard halogenantimony fire retardants for polypropylene, each of the Intumescent fire retardants was found to be more efficient and to have less adverse effect on the physical properties.
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