Patent ID: 7678444

Claim:
An article comprising a thermoformable composite comprising: a core comprising a renewable polymer having: (a) a T s value of up to about 90° C.; and (b) a heat distortion index of up to about 90° C.; and a heat-resistant outer layer surrounding the core, the heat-resistant outer layer having a first and a second layer and the core being positioned between the first and second layers and wherein an interface is formed between the core and each of the first and second layers and wherein one or more of the interfaces provides an interpenetrating network and the heat-resistant outer layer further comprising a heat-resistant polymer having: (a) a T s value of greater than about 60° C.; and (b) a heat distortion index of greater than about 50° C.; wherein the renewable polymer comprises at least about 60% by weight of the composite; wherein the heat-resistant polymer has a T s value and heat distortion index greater than that of the renewable polymer.