Acid-treated double metal cyanide complex catalysts

B - Operations – Transporting – 01 – J

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B01J 27/26 (2006.01) C08G 65/10 (2006.01) C08G 65/26 (2006.01)

Patent

CA 2331035

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.

On peut réduire efficacement le degré d'impureté à masse moléculaire élevée propre à un polyol de polyéther résultant de l'alcoxylation d'un initiateur actif à base d'hydrogène et d'un catalyseur complexe à cyanure métallique double hautement actif en soumettant le catalyseur à un traitement par acide protique, avant l'utilisation de celui-ci dans une polymérisation. Parmi les acides protiques appropriés figurent l'acide phosphorique et l'acide acétique. Les polyols de polyéther résultants, d'une pureté supérieure, sont particulièrement utiles dans la fabrication de mousses de polyuréthane en plaques et moulées, lesquelles ont tendance à s'affaisser ou à se resserrer excessivement en présence de niveaux élevés de queue à masse moléculaire importante dans le polyol de polyéther.

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