The present invention relates to compositions comprising blends of alkenyl
aromatic polymers such as styrenic polymers (i.e. PS and HIPS) and
bio-based or biodegradable polymers (i.e. PLA, PGA, PHA, PBS, PCL)
compatibilized with styrene-based copolymers (i.e.
styrene-ethylene-butylene-styrene (SEBS) block copolymers, maleated SEBS,
styrene-maleic anhydride (SMA) copolymer, styrene-methyl methacrylate
(SMMA) copolymer) or a mixture of two or more styrene-based copolymers
such as SEBS and SMA. These novel compositions can be extruded and
thermoformed to produce very low density food service and consumer foam
articles such as plates, hinged lid containers, trays, bowls, and egg
cartons with good mechanical properties.