Process for the preparation of polyoxyalkylene polyether...

Details Process for the preparation of polyoxyalkylene polyether... Process for the preparation of polyoxyalkylene polyether...

C - Chemistry, Metallurgy

08

G

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

Patent

CA 2241269

Substantially transition metal-free polyoxyalkylene polyethers may be prepared by double metal cyanide complex-catalyzed oxyalkylation of a suitable hydric oxyalkylation initiator molecule by employing 15 ppm or less of a double metal cyanide complex oxyalkylation catalyst having a propylene oxide polymerization rate greater than 5g propylene oxide/minute. The induction periods associated with oxyalkylation employing double metal cyanide complex catalysts may be reduced by preparing preactivated master batches and by increasing the oxyalkylation reactor temperature during at least the induction period.

Des polyoxyalkylènes polyéthers pratiquement exempts de métaux de transition peuvent être préparés par oxyalkylation catalysée avec un complexe de cyanure de métal double d'une molécule initiatrice de l'oxyalkylation hydrique en utilisant 15 ppm ou moins d'un catalyseur d'oxyalkylation par complexe de cyanure de métal double dont la vitesse de polymérisation de l'oxyde de propylène est supérieure à 5g d'oxyde de propylène/minute. Les périodes d'induction associées à l'oxyalkylation utilisant des catalyseurs complexes de cyanure de métal double peuvent être réduites en préparant des lots importants préactivés et en augmentant la température du réacteur d'oxyalkylation pendant au moins la période d'induction.

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