polypropylene glycol

Polypropylene glycols are liquids, mostly insoluble in water, used to suppress foaming in industrial processes and for making polyurethane resins, hydraulic fluids, and various other materials.

…are polyethylene glycol (PEG) and polypropylene glycol (PPG). Base-catalyzed, ring-opening polymerization is employed for ethylene and propylene oxides, while acid catalysis is used with tetrahydrofuran. Depending on molecular weight, these polyethers range from viscous liquids to waxy solids. The largest outlet for all three is in the manufacture of polyurethanes…