Method for extraction of impurities in polymer.

摘要

There is disclosed a method for extraction of impurities in polymer dispersion which comprises bringing an extractant in contact with a polymer dispersion under a high pressure, wherein the weight ratio of the polymer to the extractant is in a limited range. According to the disclosure, a dispersion containing a polymer can be purified efficiently to the degree to meet the market demand without damaging the basic performance of the raw material.