Patent ID: 7915328

Claim:
A resinous, flame-retardant composition comprising (i) 40-66 wt. % alkenyl aromatic resin, (ii) 9-33 wt. % ammonium polyphosphate, (iii) 14-40 wt. % cellulosic material, (iv) an amount of between 0.1 parts per 100 parts resinous components (phr) and 10 phr of at least one metal stearate, (v) 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, and (vi) 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, wherein all weights are based on the total weight of the composition and wherein ammonium polyphosphate and cellulosic material 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.