Polyurethanes containing the polyether backbone were found to give superior adhesives at cryogenic temperatures as compared to epoxy resins. However, the adhesives showed poor performance at 250 and 400°F. The adhesives were prepared from 2,4‐toluene diisocyanate (TDI)‐terminated polyether polyols and cured with 3,3′‐dichloro‐4,4′‐diaminodiphenylmethane (MOCA, du Pont). The addition of free TDI causes an increase in elevated temperature strength when an equivalent amount of MOCA was used.
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Sandler et al. (1965) studied this question.
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