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The Polyether Polyols used in the Manufacture of Polyurethanes are Hydroxy-terminated Macromolecules, with molecular weights ranging from 250 to 8000. The hydroxy functionality can range from 2 to 8. The Alkylene Oxide Polymerization is usually initiated by Alkaline Hydroxides, especially Potassium Hydroxide. In the Base-catalyzed Polymerization of Propylene Oxide (PO), some Rearrangement occurs to give Allyl Alcohol. Further Reaction of Allyl Alcohol with PO produces a Monofunctional Alcohol. Therefore, Polyether Polyols derived from PO are not truly Difunctional. By using Zinc Hexacyano Cobaltate (Double Metal Cyanide) as catalyst, a more Difunctional Polyol is obtained. The backbone of the Polyether Polyols are either PO Homopolymers or Random or Block Copolymers with Ethylene Oxide. Important Characteristics of the Polyol are their Hydroxy Functionality, Hydroxy equivalent weight, and their reactivity and compatibility with the other Components used in the Polyurethane Formulation.

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