POLYVINYL ALCOHOL AND PURIFICATION METHOD THEREOF
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United States of America Patent
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Jul 28, 2016
app pub date -
Jan 26, 2016
filing date -
Jan 27, 2015
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Abstract
Highly purified polyvinyl alcohol (PVA) which meets the standard of pharmaceutical grade is provided. The PVA has of less than 0.1 wt % of residual methanol, less than 0.1 wt % of residual methyl acetate, and less than 0.3 wt % of residual sodium acetate. A method for obtaining highly purified PVA is further provided.
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