Process for manufacturing polyvinyl alcohol polymers containing acetoacetic ester groups
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United States of America Patent
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Feb 17, 1998
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N/A
app pub date -
May 21, 1996
filing date -
May 21, 1996
priority date (Note) -
Expired
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Abstract
This invention relates to an improved process for the production of polyvinyl alcohol containing keto-ester groups wherein a polymer containing polyvinyl alcohol units is contacted with a compound having keto-ester forming groups under conditions for forming keto-ester groups on the polymer. The improvement in the process comprises: contacting a solid polymer containing vinyl alcohol units with a liquid phase acetoacetate of the formula: ##STR1## where R is chosen independently from alkyl groups under conditions for converting the alcohol functionality to the keto ester form; and then, removing unreacted acetoacetate forming group and volatile byproduct alcohol from the solid polymer.
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