Method for preparing polyamide resin
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United States of America Patent
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May 23, 2017
Grant Date -
Oct 13, 2016
app pub date -
Dec 3, 2014
filing date -
Dec 3, 2013
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Abstract
The present invention relates to a method for preparing a polyamide resin, comprising the steps of: (a) preparing a polyamide polymer by anionically polymerizing a monomer including 2-pyrrolidone; (b) refining an unreacted monomer and a catalyst in the polyamide polymer with water; (c) pH-controlling through an ion exchange of the refined water; and (d) recovering the unreacted monomer by concentrating the pH-controlled water.
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