Polyvinyl alcohol copolymer film for packaging liquid...

C - Chemistry – Metallurgy – 11 – D

Patent

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Details

C11D 17/04 (2006.01) C08F 216/06 (2006.01)

Patent

CA 2519576

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 to is not significantly affected adversely by the detergent. Such film produces pouches having a greater storage shelf-life over prior art water- soluble film.

De manière générale, l'invention porte sur un film copolymère hydrosoluble comprenant un copolymère hydrolysé d'acétate de vinyle et un deuxième monomère, le copolymère d'alcool polyvinylique ainsi obtenu présentant un degré d'hydrolyse, exprimé sous forme de pourcentage d'unités d'acétate de vinyle converties en unités d'alcool vinylique, d'environ 90 % à 100 %. Le deuxième monomère est de préférence sélectionné dans le groupe de monomères possédant une fonctionnalité de carboxylate ou de sulfonate. Le film copolymère hydrosoluble est destiné à fabriquer des sacs servant à contenir une dose unitaire d'un détergent liquide tel qu'un produit de lessive détergent. Dans un aspect, la solubilité du film n'est pas sensiblement affectée par le détergent. Ce film permet de fabriquer des sacs ayant une plus grande durée de stockage que les films hydrosolubles existants.

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