Extrudable polyvinyl alcohol compositions containing polyester-polyether block copolymers
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United States of America Patent
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Sep 20, 1994
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N/A
app pub date -
Feb 25, 1993
filing date -
Feb 25, 1993
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Abstract
In a melt extrudable polyvinyl alcohol composition consisting essentially of polyvinyl alcohol and plasticizer, which has been made melt extrudable by adding sufficient energy to the polyvinyl alcohol to both melt and substantially eliminate the crystallinity in the melt while simultaneously removing energy from the melt at a rate sufficient to avoid decomposition of the polyvinyl alcohol, the improvement which comprises 5 to 25 wt % poly(butylene terephthalate)-polytetrahydrofuran block copolymer for improved impact resistance.
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