PROCESS FOR MAKING LOW COMPRESSION SET AND HIGH AIRFLOW MDI VISCOELASTIC POLYURETHANE FOAM

摘要

There is provided a reaction system comprising an organic polyisocyanate and an isocyanate-reactive component for the production of a viscoelastic polyurethane foam. (I) from 10 to 50% by weight of at least one low equivalent propylene oxide rich (PO-rich) polyol having a mixed number average equivalent weight of from 200 to 500, (ii) a mixed number average equivalent weight of from 200 to 800 45 to 95% by weight of at least one EO-rich polyol having an ethylene oxide content of 40% to 65% by weight of the total mass of the ethylene oxide (EO-rich) polyol, and (iii) 10 to 30% by weight of at least one high equivalent PO-rich polyol having an equivalent weight, or (iv) 10 to 40% by weight of at least one propylene oxide copolymer polyol containing styrene-acrylonitrile.