Patent ID: 9527958
Filing Date: 2016-12-27
CPC Classification: C08G

Claim Text:
1. A process for producing a high purity polyether carbonate polyol which contains no more than 90 ppm of catalyst residue, consisting of (1) adding from 0.5% to 5% by weight, based on 100% by weight of polyether carbonate polyol, of diatomaceous earth having a permeability rating of less than or equal to 0.200 darcys to a polyether carbonate polyol to form a suspension; (2) mixing the suspension, formed in (1) for a time period of from 30 minutes to 5 hours at temperature in the range of from 20° C. to 150° C.; and (3) filtering the suspension from (2), thereby forming the high purity polyether carbonate polyol.