METHOD OF PREPARING POLYOLS FOR SUPPLE BLOCKED FOAMED PLASTICS Russian patent published in 2005 - IPC

FIELD: polymer production.

SUBSTANCE: polyol polyethers are prepared by cycle-cleaving polymerization of ethylene oxide and at least one alkylene oxide having at least three carbon atoms in molecule and attachable to H-functional initiator in presence of catalyst. H-functional initiator binds up to 40% (based on the weight of final polyol polyether) of ethylene oxide or mixture thereof with aforesaid alkylene oxide with at least 98 wt % ethylene oxide in presence of catalyst, which is at least one basic compound. To thus obtained polyol polyether, at least one alkylene oxide as defined above or mixture of ethylene oxide with the latter containing up to 20 wt % ethylene oxide is chemically added using as catalyst at least one metal cyanide-based compound.

EFFECT: enabled preparation of polyol polyethers with high level of ethylene oxide and low hydroxyl number.

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