Is a
Patent attributes
Patent Applicant
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Su-Jeong Lee0
Dong-Hun Hyun0
Hee-Jong Lee0
Date of Patent
May 23, 2017
0Patent Application Number
151006360
Date Filed
December 3, 2014
0Patent Primary Examiner
Patent 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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