Flame retardant polylactic acid compounds

摘要

A significant disadvantage of the use of polylactic acid (PLA), lack of flame retardance, has been overcome by the use of polyphosphonate-co-carbonate in combination with an impact modifier, a drip suppressant, and optionally, an epoxy functional styrene-acrylate oligomeric chain extender. The compound achieves a UL 94 rating of V-0 or V-1 and a Notched Izod value of more than about 5 ft-lbs/in. The compound also exceeds a threshold of 100° C. in heat deflection temperature.

主权项

1. A heat resistant, flame retardant polylactic acid compound, comprising:
(a) polylactic acid in an amount of from about 30 to 39 weight percent of the compound; (b) polyphosphonate-co-carbonate; (c) core/shell siloxane/(meth)acrylate copolymer impact modifier in an amount of from about 5 to about 12 weight percent of the compound; (d) drip suppressant in an amount of from about 0.1 to about 2 weight percent of the compound; and optionally (e) an oligomeric chain extender, wherein the compound when shaped into a plastic article has a heat deflection temperature increase of at least 5° C. more than the heat deflection temperature of a plastic article made of polylactic acid alone, when both are measured at 66 pounds per square inch using the protocol of ASTM D648.