Extrudable polyvinyl alcohol compositions containing...

Details Extrudable polyvinyl alcohol compositions containing... Extrudable polyvinyl alcohol compositions containing...

C - Chemistry, Metallurgy

08

L

C08L 29/04 (2006.01) B29C 47/36 (2006.01) B29C 47/80 (2006.01) C08L 71/02 (2006.01)

Patent

CA 2080324

An extrudable polyvinyl alcohol composition useful for packaging and molding applications is prepared by melt blending polyvinyl alcohol and thermoplastic polyethylene oxide to provide a product which has improved pH stability and salt solution solubility. Useful extruded articles prepared from such compositions include films and containers. A method for extruding the polyvinyl alcohol composition comprises: adding sufficient energy to the polyvinyl alcohol composition to both melt it and essentially eliminate the polyvinyl alcohol crystallinity in the melt, and simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol. The thermoplastic polyethylene oxide may be added to the polyvinyl alcohol before the polyvinyl alcohol is melted and its crystallinity eliminated or blended with the thus thermally treated polyvinyl alcohol and then melt extruding the polyvinyl alcohol/polyethylene oxide blend.

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