Methods of making biodegradable films having enhanced ductility and breathability
AssigneeKimberly-Clark Worldwide, Inc.
InventorsVasily A. Topolkaraev, Dave A. Soerens
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Abstract
The present invention is directed to methods of making biodegradable films and biodegradable precursor films having enhanced breathability and ductility. The method includes blending a water soluble polymer and a biodegradable polymer to form a blended polymer mixture. The biodegradable polymer is preferably a biodegradable aliphatic polyester, and the water-soluble polymer is preferably polyethylene oxide and/or polyethylene glycol. The blended polymer mixture is formed into a precursor film. The precursor film is further processed to form a breathable biodegradable film.
Claims28
A method of producing a biodegradable film comprising:
- blending a water soluble polymer and a biodegradable polymer to form a blended polymer mixture;
- forming the blended polymer mixture into a precursor film;
- and
- forming the precursor film into a biodegradable film by stretching the precursor film wherein the biodegradable film has a water vapor transmission rate of greater than about 2500 g/m2/24 hrs.
Dependencies are inferred from the claim text.