Published : 2022-09-19

Trimerization of 3-isocyanatomethyl-3/5A5-trimethylcyclohexyl isocyanate (IPDI)


Trimerization of IPDI was studied in relation to catalyst type and reaction temperature. 2,4,6-tris(Dimethylaminomethyl)phenol (DMP-30), potassium acetate (K 64), l,4-diazabicyclo[2.2.2]octane (DABCO), tetrabutyl orthotitanate (TBT), and a DMP-30/K 64 binary system were used as catalysts (used in 1, 2 or 5% based on IPDI weight). When dissolved in butyl acetate and stirred for 1 h at 80°C with 5% of DMP-30, IPDI yielded a trimer melting at 286-289°C (Table 1). The most active catalyst was K 64 (added 1% by wt., as a solution in ethyl acetate containing 15% of K): in 1 h at 80°C, a trimer was obtained in 98% yield. TBT (1%, 5%), DMP-30 (1%), DABCO, and K 64 (1%, 23°C) proved to be inactive as catalysts. In the binary system studied, the DMP-30 was found to inhibit the catalytic action of the K 64 consistuent.




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Wejchan-Judek, W., Polus, I., Doczekalska, B., & Pertek, H. (2022). Trimerization of 3-isocyanatomethyl-3/5A5-trimethylcyclohexyl isocyanate (IPDI). Polimery, 46(2), 131-132. Retrieved from