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 47/00 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2046408

PATENT - 184PUS04287 ABSTRACT An extrudable polyvinyl alcohol composition useful for packaging and molding applications is prepared by melt blending polyvinyl alcohol and thermoplastic polyurethane to provide a product which has low water absorptivity improved impact resistance, and improved low temperature/low humidity tensile properties. Useful extruded articles prepared from such compositions include films and bottles. 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 crystallinlty in the melt, and simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol. The thermoplastic polyurethane may be added to the polyvinyl alcohol before the polyvinyl alcohol is melted and its crystallinity eliminated or blended with the thus treated polyvinyl alcohol and then melt extruding the polyvinyl alcohol/polyurethane blend.

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