Packaging films and methods of making the same

A method for making a water-soluble packaging film, the method comprising:

• forming a film base composition comprising a biodegradable polymer and a film base solvent;
• forming a casting base composition comprising a polyhydric alcohol, or a polyhydric acid, or combinations thereof;
• a chelating agent;
• an emulsifier;
• a bulking agent;
• and a casting base solvent;
• mixing the film base composition with the casting base composition to form a casting composition;
• and
• casting a film from the casting composition to form a resulting water-soluble film;
• wherein the resulting water-soluble film comprises:
• 20 wt. % to 50 wt. % biodegradable polymer,
• 5 wt. % to 40 wt. % polyhydric alcohol, or polyhydric acid, or a combination thereof,
• 4 wt. % to 10 wt. % emulsifier, or surfactant, or a combination thereof;
• 5 wt. % to 25 wt. % chelating agent comprising one or more of a citric acid salt, a citric acid ester, a gluconic acid salt, a glucaric acid salt, a tartaric acid salt, a phosphate salt, a diphosphate salt, and a triphosphate salt;
• and
• 15 wt. % to 45 wt. % bulking agent;
• wherein the wt. % is based on the total weight of the water-soluble packaging film;
• wherein the biodegradable polymer is not crosslinked.