Patent ID: 6514602
Filing Date: 2003-02-04
Classification: A61F,A61L,B32B,Y10T

Abstract:
A film which is water-flushable and biodegradable, and which comprises:a. a first layer, which comprises: (1) from about 70 to 100% of a water-insoluble biodegradable thermoplastic polymer; (2) from about 20% to about 30% of a substantially water-soluble thermoplastic polymer; and b. a second layer adjacent the first layer, which comprises: (1) from about 60 to 100% of a substantially water-soluble thermoplastic polymer; (2) from 0 to about 40% of a water-insoluble biodegradable thermoplastic polymer; wherein the second layer is substantially thicker than the first layer; wherein the substantially water-soluble thermoplastic polymer is selected from the group consisting of hydroxypropyl cellulose, polyethylene oxide, polypropylene oxide, polyvinyl alcohol and copolymers, polyvinylpyrollidone, polyvinyl pyridine, gelatinized starch, interpenetrated networks of starch with ethylene/vinyl alcohol copolymers, nylon copolymers, polyethylene glycol, and mixtures thereof; and wherein the biodegradable polymer has a transition temperature (Tg) of about 20Â° C. or less and volume percent of crystallinity (&PHgr;C) of from about 2 to about 65% and is selected from the group consisting of aliphatic polyalkylene succinate polymers, polyalkylene succinate adipate copolymers, aliphatic-aromatic copolyesters, polyesteramides and compatible mixtures thereof.