PLA/PBAT/Starch Ternary Blown Film Compound

About This Product

A three-component melt blend of polylactic acid, poly(butylene adipate-co-terephthalate) and starch, supplied as a pellet for blown film extrusion. PLA is the rigid polyester of the system, PBAT the flexible copolyester that carries elongation and tear, and starch the third and wholly renewable phase, dispersed into the melt during compounding. Starch is the cheapest and most renewable component in the blend and also the weakest: it sits as a discrete phase in the polyester matrix rather than co-crystallising with it, so every granule acts as a stress concentration, and its hydroxyl-rich surface draws in water. Adding starch as a third component to a PLA/PBAT system lowers the resin cost and raises the bio-based fraction, at some cost in mechanical performance and moisture sensitivity relative to the two-component blends. This is the grade for general-purpose film where the specification has headroom and the economics matter. Where the film has a demanding tear, barrier or food-contact requirement, one of the dedicated compounds is the better starting point. Supplied as a raw material for processing on the buyer's own line. We do not produce finished articles. It is used in general-purpose film, in overwrap and in cost-sensitive film conversion. Bio Green Chem supplies the ternary blown film compound to specification on blend ratio and starch loading, melt flow, film gauge and lot size.