Acetoacetyl group-containing polyvinyl alcohol resin powder composition, and production method therefor
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United States of America Patent
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Mar 14, 2017
Grant Date -
Aug 18, 2016
app pub date -
Oct 10, 2014
filing date -
Oct 30, 2013
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Abstract
Acetoacetyl group-containing polyvinyl alcohol resin powder composition containing a C1 to C3 alcohol in an amount of 0.5 to 4 wt % is produced by allowing a powdery polyvinyl alcohol resin to react with diketene, washing the resulting acetoacetyl group-containing polyvinyl alcohol resin particles with the C1 to C3 alcohol to remove an unreacted portion of the diketene, and drying the intermediate acetoacetyl group-containing polyvinyl alcohol resin particles composition at a temperature of 40° C. to 120° C. at a pressure of not higher than 20 kPa after the washing. The acetoacetyl group-containing polyvinyl alcohol resin powder composition thus produced is highly soluble in water.
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