Flame retardant resinous compositions and process

摘要

Disclosed is a flame-retardant composition comprising (i) 40-66 wt.% alkenyl aromatic resin, (ii) 9-33 wt.% ammonium polyphosphate and (iii) 14-40 wt.% starch, wherein all weights are based on the total weight of the composition and wherein ammonium polyphosphate and starch are present in a weight % ratio effective to provide molded articles exhibiting at least V-1 flame rating as determined according to the UL-94 protocol. Processes to prepare the composition and articles comprising a composition of the invention are also disclosed.