Epoxy resin modified polyether polyols from mixed initiators.

摘要

Modified polyether polyols are made by first optionally alkoxylating, subsequent reaction with epoxy resins and final alkoxylation of mixtures of initiators comprising 60 to 90 weight % of a partially alkoxylated trifunctional initiator and 10 to 40 weight % of a secondary partially alkoxylated initiator having an active hydrogen functionality of from 4 to 8. Preferably, the alkylene oxide component is a blend of ethylene oxide and propylene oxide, and the resulting modified polyol molecules have 0.25 to 2.5 weight % of internally located epoxy resin. Flexible polyurethane foams made from these polyether polyols have improved load bearing properties as compared with those made from prior art polyols.