Increased reactivity of isocyanate terminated polyether prepolymers with metal halide salt complexes of methylenedianiline
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United States of America Patent
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Mar 21, 1989
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N/A
app pub date -
Feb 8, 1988
filing date -
Feb 8, 1988
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Expired
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Abstract
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 (MDA.sub.3 -NaCl), dispersed in dioctylphthalate (50/50 wt/wt).
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