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US 6,207,792 B1Granted
Melt-stable amorphous lactide polymer film and process for manufacture thereof
AssigneeCargill, Incorporated
InventorsPatrick Richard Gruber, Jeffrey John Kolstad, Christopher M. Ryan, Eric Stanley Hall, Robin Sue Eichen Conn
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Abstract
An amorphous film comprised of a lactide polymer. The lactide polymer comprises a plurality of poly(lactide) polymer chains, residual lactide in concentration of less than about 2 percent and water in concentration of less than about 2000 parts-per-million. A process for manufacturing an amorphous film with the lactide polymer composition is also disclosed.
Claims10
A packaging film comprising at least one amorphous film containing polylactide polymer composition, the amorphous film containing polylactide polymer composition comprises:
- (a) a plurality of polylactide polymer chains, said plurality of polylactide polymer chains having a number average molecular weight of about 40,000 to about 250,000;
- (b) residual lactide, if present at all, present in a concentration of less than about 0.5% by weight;
- (c) said amorphous film exhibiting a net endotherm of less than about 10 joules per gram of polylactide polymer composition;
- (d) said amorphous film can be heat sealed at a temperature lower than 70° C. at a line pressure of less than 40 psi and at a time of less than 2 seconds;
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- (e) an anti-blocking filler.
3 more elements
Dependencies are inferred from the claim text.