Methods of making articles are provided in which a self-supporting structure
formed of natural polymer has a self-adherent, moisture resistant thermoplastic
film comprising gelatinized starch and a hydroxy-functional polyester on the structure
surface. The self-supporting structure preferably is a starch and polyvinyl alcohol
blend in an expanded form. The articles typically do not delaminate even when soaked
in water, and are biodegradable.
