PURPOSE: To provide an extrudable polyvinyl alcohol compsn. useful for packaging and molding applications obtaining a product having low water absorptivity, improved impact resistance and improved low temp./low humidity tensile properties by melt blending polyvinyl alcohol and thermoplastic polyurethane.
CONSTITUTION: The method for the extrusion molding of a polyvinyl alcohol compsn. is constituted by adding sufficient energy to the polyvinyl alcohol compsn. 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 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.
FUIN RENAATO MAATEIN
JIEIMUZU EFU NANGEROONI
