Increased reactivity of isocyanate terminated polyether prepolym

Details Increased reactivity of isocyanate terminated polyether prepolym Increased reactivity of isocyanate terminated polyether prepolym

1988-02-08

1989-03-21

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 66, 528 76, C08G 1810

Patent

active

048144118

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).

REFERENCES:
patent: 3755261 (1973-08-01), Van Gulick
patent: 4330454 (1982-05-01), Kimball
patent: 4463155 (1984-07-01), Kibler
patent: 4517331 (1985-05-01), Parker et al.

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