Method of manufacturing polybenzoxazole precursor
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United States of America Patent
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Jul 16, 2013
Grant Date -
Mar 7, 2013
app pub date -
Aug 30, 2012
filing date -
Aug 31, 2011
priority date (Note) -
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Abstract
The present invention provides a method for producing a polybenzoxazole precursor having reduced contents of residual aprotic polar solvent and residual halogen without discharging a large amount of waste water during purification. The present invention specifically relates to a method for producing a polybenzoxazole precursor, which comprises synthesizing a polybenzoxazole precursor in an aprotic polar solvent, adding and mixing water and a water-insoluble solvent with the resulting polybenzoxazole precursor solution to still stand the solution, and then separating a water layer from the solution to reduce a content of impurities remaining in the polybenzoxazole precursor.
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