REDUCED DENSITY FLEXIBLE POLYURETHANE FOAM FROM METHYLENE DIPHENYLISOCYANATE

摘要

Disclosed is the preparation of a water-blown, methylene diphenylisocyanate-based (MDI) polyurethane foam, and particularly a flexible, slabstock polyurethane foam. The foam is prepared in the presence of a processing aid which comprises at least one monohydroxyl polyether having an equivalent weight of from 600 to 5000 and an oxyethylene content of from 25 to 75 weight percent. The processing aid permits the more efficient use of water as blowing means providing a foam having a reduced density and attractive physical properties.