公开(公告)号：EP0949275A4

公开(公告)日：2000-08-09

申请号：EP97949221

申请日：1997-12-22

Applicant: KAO CORP

Inventor： SHIMOKAWA KEISHI ,  IMAKI TAKUYA ,  SHIDA JUN ,  NOJIRI NAOKI ,  HIRAMATSU SHINOBU

IPC: C08F6/00 ,  C08F6/06 ,  C08J3/00

CPC classification number: C08F6/003 ,  Y10S210/908

Abstract: To provide a method for purification of the ionic polymer compound comprising efficiently removing low-molecular impurities, for example, ionic remaining monomers, which are charged identically to the ionic polymer compound from the ionic polymer compound in a shorter period of time. A method for purification of an ionic polymer compound, characterized by removing low-molecular impurities, such as ionic remaining monomers, by the use of an ultrafiltration membrane and/or a reverse osmosis membrane from an aqueous solution containing the ionic polymer compound and low-molecular impurities which are charged identically to the ionic polymer compound, under conditions that a concentration of the ionic polymer compound is from 7 to 20% by weight, and that an amount of charges of the ionic polymer compound in the aqueous solution is 0.30 gram-equivalent/liter or more.