Patent ID: 7998888

Claim:
A film comprising a thermoplastic starch formed from about 30 wt. % to about 95 wt. % of at least one starch, from about 1 wt. % to about 35 wt. % of at least one plasticizer, and from about 1 wt. % to about 35 wt. % of at least one weak organic acid, wherein the thermoplastic starch has a weight average molecular weight of from about 1,000,000 to about 5,000,000, polydispersity index of from about 0.5 to about 20, and apparent melt viscosity of from about 50 to about 800 Pascal-seconds, determined at a temperature of 150° C. and a shear rate of 100 sec −1 , and wherein the starch is melt blended with the plasticizer in the presence of the weak organic acid to form the thermoplastic starch.