| http://www.w3.org/ns/prov#value | - Suitable polyether polyols for use in the preparation of liquid MDI prepolymers containing urethane groups include polyethers prepared, for example, by the polymerization of epoxides such as ethylene oxide, propylene oxide, butylene oxide, tetrahydrofuran, styrene oxide, or epichlorohydrin, optionally in the presence of Lewis acids such as BF3, or prepared by chemical addition of such epoxides, op
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