Silylated double metal cyanide complex catalysts

B - Operations – Transporting – 01 – J

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B01J 27/26 (2006.01) B01J 31/02 (2006.01) C08G 65/10 (2006.01) C08G 65/26 (2006.01)

Patent

CA 2334194

The amount of high molecular weight impurity present in a polyether polyol produced by alkoxylation of an active hydrogen-containing initiator using a double metal cyanide complex catalyst may be advantageously lowered by treating the catalyst prior to use in polymerization with a silylating agent. Suitable silylating agents include trialkyl halosilanes and trialkyl alkyoxysilanes. 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 avantageusement réduire la quantité d'impuretés à poids moléculaire élevé présentes dans un polyol de polyéther produit par alcoxylation d'un initiateur contenant de l'hydrogène actif au moyen d'un catalyseur de complexe de cyanure métallique double, en traitant le catalyseur avec un agent de silylation avant de l'utiliser pour la polymérisation. Des agents de silylation appropriés comprennent des silanes halogénés trialkyle et des alcoxysilanes trialkyle. Les polyols de polyéther à haute pureté ainsi produits sont particulièrement utiles dans la préparation de mousses de polyuréthanne en feuilles et moulées, qui ont tendance à s'affaisser ou à devenir excessivement tendues lorsque des niveaux élevés de résidus à haut poids moléculaire sont présents dans le polyol de polyéther.

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