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Patent US10144810
Issued 2018-12-04
Pvp Copolymer For Harsh Chemical Packaging
A water soluble film useful in unit-dose chemical packaging is disclosed. The film may include: a water soluble saccharide and a polyvinyl alcohol copolymer consisting essentially of: (a) from 80 to 99 mole percent of vinyl alcohol and vinyl ester monomer; and (b) from 1 to 20 mole percent of a pyrrolidone comonomer. Such compositions may be used to provide a water-soluble film simultaneously satisfying requirements in regard to water solubility, biodegradability, and physical properties, even when used for packaging of harsh, oxidizing chemicals.
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- 1. A water-soluble film having stability with harsh chemicals, the film comprising:
a polyvinyl alcohol copolymer A consisting essentially of:
(a) from 95 to 99 mole percent of vinyl alcohol and vinyl ester monomer; and
(b) from 1 to about 5 mole percent of a pyrrolidone comonomer;
a polyvinyl alcohol copolymer B comprising:
(a) from 94 to 99 mole percent of vinyl alcohol and vinyl ester monomer; and
(b) from 1 to 6 mole percent of a comonomer comprising sulfonic acid groups; and
at least one water-soluble monosaccharide having a solubility in water at 25° C. of at least 0.1 moles per liter; wherein the water-soluble film comprises from about 20 wt % to about 30 wt % copolymer A and from about 70 wt % to about 80 wt % copolymer B, based on a total amount of copolymers A and B.
