Non-halogen containing flame retardant system for thermoplastic polymers

摘要

A flame retardant composition, especially suitable for use in flame retarding polyurethane compositions, comprises 60%-80% of encapsulated ammonium polyphosphate, 10%-30% of an inorganic metal oxide flame retardant, such as zinc borate, and 5%-10% of a char-forming compound, such as pentaerythritol.