Patent ID: 9669375
Date: 2017-06-06
CPC Classifications: B01J

Claim:
1. A process for preparing a colloidal dispersion, comprising: (a) preparing an aqueous colloidal dispersion of cerium-containing oxide nanoparticles; (b) adding a substantially non-polar solvent and an amphiphilic material; (c) mixing the liquid mixture of step (b) to form an emulsion; (d) heating the emulsion to a temperature ranging from about 20° C. to less than 60° C. for a predetermined time, whereafter the emulsion separates into a substantially non-polar colloidal phase and a remnant aqueous phase; and, (e) collecting the separated substantially nonpolar colloidal dispersion of cerium-containing oxide nanoparticles wherein the process further comprises adding at least one glycol ether prior to step (e) in step (b), after step (c), or during step (d), and adding at least one glycol ether to the collected substantially non-polar colloidal dispersion of cerium-containing oxide nanoparticles after step (e), wherein said glycol ether is selected from the group consisting of diethylene glycol monomethyl ether, propylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, dipropylene glycol methyl ether, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol rnonopropyl ether, and combinations thereof.