Polyurethanes prepated using poly(silyldiamines)

摘要

A composition for preparing polyurethanes comprising an organic polyisocyanate; a poly(silyldiamine) of the unit formula <IMAGE> wherein the grouping <IMAGE> is a divalent organic radical terminated by two nitrogen atoms with R being a divalent organic moiety, or a divalent alicyclic radical in which R and R1 with the two nitrogens form a cyclic diamine structure, R1 is hydrogen or a monovalent hydrocarbon, R2 is a monovalent hydrocarbon, and n is an integer greater than 1; and a polyol. When poly(silyldiamines) of the above formula are reacted with a polyisocyanate prepolymer and a polymeric polyol, elastomeric polyurethanes having good elastomeric properties are obtained.