Patent ID: 6538043
Filing Date: 2003-03-25
Classification: C08G

Abstract:
A process for the preparation of a co-initiated polyether polyol, which process comprises the steps of:(a) preparing a mixture of: (a1) at least one aromatic initiator containing at least two active hydrogen atoms per molecule and (a2) at least one polyethylene glycol having a molecular weight in the range of from 400 to 1000 and (a3) optionally one or more aliphatic initiators containing from 2 to 6 active hydrogen atoms per molecule in an amount of at most 20 mole % based on total moles of (a1) and (a3), wherein the molar ratio of (a1) to (a2) is in the range of from 0.5:1 to 5:1, (b) reacting the mixture obtained in step (a) in the presence of a suitable alkoxylation catalyst with at least one alkylene oxide having three or more carbon atoms per molecule using such quantity of alkylene oxide that the polyether polyol obtained has a hydroxyl value in the range of from 150 to 400 mg KOH/g, and (c) recovering the co-initiated polyether polyol.