PROCESS FOR PRODUCING A SOFT, FLEXIBLE, HOT MOLDED POLYURETHANE FOAM

摘要

A process for the preparation of a soft, flexible, hot molded polyurethane foam is prepared by reacting a polyol formulation comprising a polyether polyol, a non-trimerization polyurethane catalyst and water with an organic isocyanate under hot molding conditions. The polyol formulation further comprises (a) at least one poly(oxyalkylene) polyether polyol having functionality of at least two, an ethylene oxide content of at least 80 percent and a molecular weight greater than 1,000; and (b) at least one monofunctional additive. The addition of a least one monofunctional additive and at least one poly(oxyalkylene) polyether polyol of functionality of at least two, an ethylene oxide content of a least 80 percent and a molecular weight greater than 1,000 to a conventional polyether polyol formulation has positive effect on foam processing, cell opening, and foam softness and does not negatively affect foam aging properties, especially its compression sets.