Packaging films and methods of making the same
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United States of America Patent
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Jan 21, 2025
Grant Date -
Jan 4, 2024
app pub date -
Sep 19, 2023
filing date -
Oct 23, 2018
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Abstract
Methods for making water-soluble films include forming a film base composition comprising a biodegradable polymer and a film base solvent, forming a casting base composition comprising a polyhydric alcohol, a polyhydric acid, or combinations thereof, a chelating agent, an emulsifier, a bulking agent, and a casting base solvent, and mixing the film base composition with the casting base composition to form a casting composition. Then, a film is cast from the casting composition to form a resulting water-soluble film. The water-soluble film includes 20 wt. % to 50 wt. % biodegradable polymer, 5 wt. % to 40 wt. % polyhydric alcohol, polyhydric acid, or combinations thereof, 4 wt. % to 10 wt. % emulsifier, surfactant, or combination thereof, 5 wt. % to 25 wt. % chelating agent, and 15 wt. % to 45 wt. % bulking agent, which are each based on the total weight of the water-soluble packaging film.
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