Patent ID: 7915329

Claim:
A resinous, flame-retardant composition comprising (i) 40-66 wt. % alkenyl aromatic resin, (ii) 9-33 wt. % ammonium polyphosphate, (iii) 14-40 wt. % starch, (iv) at least one adjunct flame retardant selected from the group consisting of monophosphate esters, triaryl phosphates, triphenyl phosphate, tricresyl phosphate, tritolyl phosphate, diphenylcresyl phosphate, phenyl bisdodecyl phosphate, ethyl diphenyl phosphate, diphosphate esters, aryl diphosphates, resorcinol diphosphate, bisphenol A diphosphate, diphenyl hydrogen phosphate, 2-ethylhexyl hydrogen phosphate and oligomeric phosphates, (v) an adjunct copolymer selected from the group consisting of styrene-maleic anhydride copolymer (SMA), styrene-acrylonitrile-maleic anhydride copolymer (SANMA), poly(ethylene-g-maleic anhydride), poly(propylene-g-maleic anhydride), (ethylene-propylene)-g-maleic anhydride, EPDM-g-maleic anhydride, styrene-acrylic acid copolymer (SAA) and mixtures thereof, and (vi) at least one metal stearate, 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.