Modified diphenylmethane diisocyanates useful in polyurethanes or polyisocyanurates

摘要

Covers a water-modified diisocyanate mixture obtained from water-treating a diphenylmethane diisocyanate to provide a diisocyanate mixture comprising 3-25 percent by weight of diphenylmethane biuret isocyanate and 75-97 percent diphenylmethane diisocyanate. Also covers the use of said water-modified diphenylmethane diisocyanate in preparing an improved polyurethane or polyisocyanurate polymer. Also covers said polymers.