HIGH STYRENE CONTENT STABLE POLYMER POLYOLS USING EPOXY RESIN-MODIFIED POLYOLS AS DISPERSANTS

摘要

Very low viscosity polymer polyol having high styrene/acrylonitrile ratios and good stability may be achieved by the use of epoxy resin-modified polyols as a dispersant. The epoxy resin-modified polyols useful as dispersants may be made by reacting a polyol initiator having an active hydrogen functionality of 3 to 8 and one or more alkylene oxides with an epoxy resin. It is preferred that all of the epoxy resin-modified base polyol dispersant be initially charged to the reactor, along with part of the base polyol. In this invention, the base polyol is a conventional polyol unmodified with epoxy resin. The use of epoxy resin-modified polyols as dispersants results in polymer polyols having higher styrene contents, and improved stability and viscosity properties.