Process for preparing polyoxyalkylene polyether polyols having l

Details Process for preparing polyoxyalkylene polyether polyols having l Process for preparing polyoxyalkylene polyether polyols having l

1995-12-22

1998-06-16

Geist, Gary

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

Organic compounds

Oxygen containing

568621, C07C 4311

Patent

active

057673233

ABSTRACT:
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 5 g 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.

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"Standard Methods of Testing Urethane Foam Polyol Raw Materials" ASTM Designation No.: D 2849-69.

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