Acid-treated double metal cyanide complex catalysts
 The amount of high molecular weight impurity present in a polyether polyol produced by alkoxylation of an active hydrogen-containing initiator and a substantially noncrystalline highly active double metal cyanide complex catalyst may be advantageously lowered by treating the catalyst prior to use in polymerization with a protic acid. Suitable protic acids include phosphoric acid and acetic acid. The higher purity polyether polyols thereby produced are particularly useful in the preparation of slab and molded polyurethane foams, which tend to collapse or become excessively tight when elevated levels of high molecular tail are present in the polyether polyol. 
Arco Chemical Technology, L.P.
C C B
C08G C08G B01J
inventional inventional inventional
Bi Mahmoud K. Wei
Le-Khac Faraj Wang