Water-responsive polymer compositions and method of making...

C - Chemistry – Metallurgy – 08 – L

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C08L 29/04 (2006.01) A61L 15/22 (2006.01) A61L 15/62 (2006.01) C08L 67/04 (2006.01)

Patent

CA 2274676

Selectively water-responsive polymer blend compositions constructed of combinations of polymers including polylactic acid and polyvinyl alcohol are provided. A method of making a selectively water-sensitive homogenous polymer blend composition, comprising combining polylactide and polyvinyl alcohol at a temperature above the melting point of the polymer having the higher melting point, and below the decomposition point of the polymer having the lower decomposition point, to form a homogeneous polymer blend composition is also provided. The water-responsive properties of the polymer blend compositions include water-dispersible, water-disintegratable, water-weakenable, and water- stable.

L'invention concerne des compositions de mélanges polymères sélectivement sensibles à l'eau, constituées de combinaisons de polymères comprenant un acide polylactique et un alcool polyvinylique vinyle. L'invention concerne également un procédé de fabrication d'une composition homogène de mélange de polymères sélectivement sensible à l'eau, consistant à combiner un polylactide et un alcool polyvinylique à une température supérieure au point de fusion du polymère ayant le point de fusion le plus élevé, et inférieure au point de décomposition du polymère ayant le point de décomposition le plus bas, pour former une composition homogène de mélange polymère. La dispersion à l'eau, la désagrégation à l'eau, l'affaiblissement à l'eau et la stabilité à l'eau sont quelques-unes des propriétés de sensibilité à l'eau desdites compositions de mélanges polymères.

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