Liquid thickeners based on diurethanes and process of preparing the same

Abstract From the Canadian patent

Liquid thickeners based on diurethanes are prepared by alkoxylation of monovalent alcohols with 8 to 30 carbon atoms with a mixture of ethylene oxide, and propylene oxide, wherein the molar ratio of ethylene oxide to propylene oxide, in the mixture is approximately 30 : 70 to 90 : 10 and 20 to 200 mol alkylene oxides are used per mol alcohol, and the resultant polyether is reacted in a molar, ratio of 1 : 0.7 to 1 : 0.25 with a diisocyanate. Hexamethylene diisocyanate is, particularly suitable as the diisocyanate. The thickeners can be used especially for, the thickening of aqueous systems. Thickeners with widely differing properties can, be prepared by blending two or more such …