Process for preparation of hydroxyl functionalized polyether polysiloxane block copolymers

摘要

The present invention relates toA is a hydroxyl functionalized polyether polysiloxane block copolymer of structure a (- X-B) nA represents the polysiloxane block;B represents said polyether block;XIs a linker group characterized by including a portion si-c-cThe aforementioned Si is the terminal silicon atom of the polysiloxane block a;N is an integer between 2 and 4.)The end saturation of the block copolymer is0.04 mEq / g, less thanPreferably less than 0.03 mEq / gIt is further characterized that more preferably less than 0.025 mEq / g;Hydroxyl functionalized polyether polysiloxane block copolymersThe present invention relates to a method of manufacturing the same.