polysiloxane polyether polyols

Polyether polyols polysiloxane. The present invention relates to a method for manufacturing a copolymer polyether-polydialkylsiloxane block. The method comprises providing a mixture comprising at least one alkylene oxide and at least one silanol-terminated polydialkylsiloxane; and polymerizing the mixture in the presence of a double metal cyanide complex catalyst, and optionally in the presence of an aprotic solvent and / or an antioxidant. Also provided by the above method in a copolymer polyether-polydialkylsiloxane block having a molecular weight of 150-50000 g / mol and has a dispersity index of 1.0 to 1.5.