An extrusion process

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 3/02 (2006.01) C08L 29/04 (2006.01)

Patent

CA 2566510

A polymer film is made by mixing pellets of starch and of PVA together, and then thermoplastically extruding the mixture. The mixture should contain at least 10% and preferably at least 25% (by weight) of each polymer, and extrusion generates a homogeneous film which appears uniform. It can be as thin as 20 ~m. The resulting film is readily biodegradable, water-soluble or water- dispersible, and has good physical properties. This same pellet mixing extrusion process, followed by injection moulding, can be used to form other objects.

Dans cette invention, on fabrique un film polymère en mélangeant des granules d'amidon et de PVA (alcool polyvinylique) ensemble, puis en extrudant le mélange par voie thermoplastique. Ce mélange devrait contenir au moins 10 % et de préférence au moins 25 % (en poids) de chaque polymère, et l'extrusion produit un film homogène qui apparaît uniforme. Il peut être très mince, jusqu'à présenter une épaisseur de 20 ?m. Le film ainsi produit est facilement biodégradable, hydrosoluble ou dispensable dans l'eau, et il possède de bonnes propriétés physiques. Ce procédé d'extrusion par mélange de granules, suivi par un moulage par injection, peut servir à former d'autres objets.

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