Increased reactivity of isocyanate terminated polyether prepolymers with metal halide salt complexes of methylenedianiline

摘要

Increased reactivity of isocyanate terminated polyether prepolymers with metal halide salt complexes of methylenedianiline is obtained when the polyether inter­mediates are modified to contain an effective amount of ethylene oxide. A desired intermediate is poly(oxypro­pylene) diol or triol which are modified to contain ethylene oxide units therein and subsequently reacted with a polyisocyanate such as MDI, that is 4,4′-diphenyl­methane diisocyanate, or TDI, that is, toluene diisocya­nate. A desired metal halide salt complex of methylene­dianiline is the sodium chloride salt complex (MDA₃-­NaCl), dispersed in dioctylphthalate (50/50 wt/wt).