Patent ID: 7642226

Claim:
A water-soluble packet, comprising: (a) a copolymer film comprising a hydrolyzed copolymer which is poly(vinyl alcohol co-maleate); and (b) a quantity of liquid laundry detergent contained within the packet in direct contact with said copolymer film, said liquid laundry detergent being characterized by acid/base equilibria; wherein: (i) the hydrolyzed copolymer has a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of about 90% to about 100%; (ii) the level of incorporation of the maleate is in a range of about 1.5 mole % to about 11 mole %; (iii) the copolymer film, after contacting the liquid laundry detergent for 5 weeks, has an increase in disintegration time, measured at 10° C., expressed as a percentage relative to the initial disintegration time, of not more than 50%; (iv) said base of the liquid laundry detergent comprises an amine; and (v) said acid of the liquid laundry detergent comprises an acid selected from the group consisting of a fatty acid, an anionic surfactant acid, and combinations thereof.