IMPROVED WATER-SOLUBLE FILMS BASED ON A MIXTURE OF PVA POLYMERS AND PACKAGES OF THEM

摘要

1. A water-soluble film containing: at least 50 wt.%, A water-soluble polyvinyl alcohol (PVA) resin, a resin having an average viscosity of from about 13.5 to about 20 cP and a degree of hydrolysis of from about 84 to about 92% ; PVA resin containing a mixture of the first and second polyvinyl alcohol-based polymers, the first polymer having a viscosity of from about 8 to about 40 cP, preferably from about 10 to about 20 cP, and more preferably from about 10 to about 15 cP; a second PVA polymer having a viscosity of from about 10 to about 40 cP; preferably from about 20 to about 30 cP; more preferably from about 20 to about 25 cP, where the viscosity of the first PVA polymer is less than the viscosity of the second PVA polymer; the film also has no more than 30 wt.% PVA polymer having an average viscosity less than about 11 cP. 2. The water-soluble film according to claim 1, characterized in that it further comprises from about 1 to about 40 wt.%, Preferably from about 15 to about 35 wt.%, A plasticizer. The water-soluble film according to claim 2, characterized in that the plasticizer contains a material selected from the group consisting of glycerol, sorbitol, propylene glycol, 2-methyl-1,3-propanediol and mixtures thereof. A water-soluble film according to any one of claims 1 to 3, characterized in that it further comprises residual moisture, the content of which is at least 4 wt.%, Preferably from about 4 to about 10 wt.%. The water-soluble film according to any one of claims 1 to 3, characterized in