Patent ID: 8415021

Claim:
A composition comprising, based on the weight of the composition, 40 to 70 weight % of an aliphatic-aromatic copolyester, 20 to 50 weight % of starch, 2 to 10 weight % of polyol plasticizer, and optionally up to 10 weight % of water wherein the copolyester comprises a dicarboxylic acid component and a glycol component; the dicarboxylic acid component consists essentially of, based on 100 mole percent total acid component, about 80 to 40 mole % of terephthalic acid component and about 20 to 60 mole % of a linear aliphatic dicarboxylic acid component; and the aliphatic dicarboxylic acid has from 7 to 36 carbon atoms; the glycol component consists essentially of a linear aliphatic glycol component and 0 to 4 mole percent, based on 100 mole percent total glycol component, of a dialkylene glycol component; and a film prepared from the composition has a tear strength measured in the machine direction at least 3 times greater than the tear strength measured in the machine direction of a film made from the copolyester.