Abstract
The polymerization of hexamethylenediisocyanate (HDI) by Co-naphthenate was studied to establish conditions for fast exothermic reaction required for foam polymerization. Addition of an optimal concentration of DMSO (or DMF) activated the catalyst and lowered the induction period. Better control of the reaction was obtained in the presence of tributyltin oxide which showed a synergistic effect with the catalyst, and on using prepolymers of HDI. The resulting HDI foams were friable and their flammability was lower than that of aromatic polyisocyanurates.
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