Pvp copolymer for harsh chemical packaging

A water-soluble film having stability with harsh chemicals, the film comprising;

• 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;
• and having a degree of hydrolysis in the range from about 65% to about 99%;
• a plasticizer;
• and
• wherein the film has a % dissolution by weight in water at 21° C. of at least 85 wt % following exposure to a chemical and aging at a temperature in the range from about 30° C. to about 54° C. for at least 4 weeks, wherein the chemical is selected from the group consisting of dichloroisocyanuric acid, calcium hypochlorite, trichloroisocyanuric acid, 1-bromo-3-chloro -5,5-dimethylhydantoin, 1,3-dibromo-5,5-dimethylhydantoin, 2,3-dibromo-3-nitrilopropionamide;
• 2-bromo-2-nitro-1,3 propanediol, sodium bisulfate, tartaric acid, fumaric acid, oxalic acid, sodium percarbonate, sodium carbonate, sodium bicarbonate, cyanuric acid, and potassium monopersulfate.

A water-soluble film having stability with multiple harsh chemicals, the film comprising;

• 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;
• a plasticizer;
• wherein the film is compatible with each of the following chemical groups;
• peroxides, nitrates, nitrites, chromates, persulfates, borates, bromates, chlorates, periodates, chlorites, chlorinated or brominated isocyanurates, inorganic acids, organic acids, peroxy acids, superoxides, and salts and hydrates of these compounds.