Epoxide polymerization process

Details Epoxide polymerization process Epoxide polymerization process

1998-06-05

2000-02-22

Peselev, Elli

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

Organic compounds

Oxygen containing

502175, 562572, 568476, 568479, 568623, C07C 4103

Patent

active

060282304

ABSTRACT:
The amount of high molecular weight impurity present in a polyether polyol produced by alkoxylation of an active hydrogen-containing initiator using an epoxide such as propylene oxide and a substantially amorphous highly active double metal cyanide complex catalyst may be advantageously lowered by having a non-protic Lewis acid present during the epoxide polymerization. The use of halides such as zinc chloride and aluminum chloride is especially effective for such purposes. In a preferred embodiment, minor amounts of water are also present during polymerization. The higher purity polyether polyols thereby produced are particularly useful in the preparation of slab and molded polyurethane foams, which tend to collapse or become excessively tight when elevated levels of high molecular tail are present in the polyether polyol.

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