Process for preparing low unsaturation polyether polyols

Details Process for preparing low unsaturation polyether polyols Process for preparing low unsaturation polyether polyols

1997-10-23

1999-10-05

Wilson, Donald R.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568619, 568620, 568621, 568623, C07C 4144

Patent

active

059627484

ABSTRACT:
Polyether polyols having reduced terminal unsaturation are prepared in a process comprising a first step comprising reacting propylene oxide with an initiator having at least two hydroxyl groups in the presence of a basic catalyst, a second step of contacting the polyether product of the first step having allyl terminal unsaturation with an isomerization catalyst whereby the allyl terminal unsaturation of the polyether is reduced by at least 90% conversion to propenyl terminal unsaturation in one step and, in a final step, the resulting polyether product of the first step is contacted with an acid catalyst whereby a substantial amount of the propenyl terminal unsaturation of the polyether is removed and the corresponding polyether having an additional hydroxyl group is obtained.

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