Invention Grant
US07642226B2 Polyvinyl alcohol copolymer film for packaging liquid products and having an improved shelf-life 有权
用于包装液体产品的聚乙烯醇共聚物膜,具有改善的保存期限

Polyvinyl alcohol copolymer film for packaging liquid products and having an improved shelf-life
Abstract:
Generally speaking, the present invention is a water-soluble copolymer film comprising a hydrolyzed copolymer of vinyl acetate and a second monomer, the resultant polyvinyl alcohol copolymer having a degree of hydrolysis, expressed as a percentage of vinyl acetate units converted to vinyl alcohol units, of from about 90% to 100%. The second monomer is preferably selected from the group of monomers having carboxylate functionality or sulfonate functionality. The resulting water-soluble copolymer film is disclosed for use in making pouches to contain a unit dose of liquid detergent, such as a liquid laundry detergent. However, it is an aspect of the copolymer film that film solubility is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water-soluble film.
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