| 摘要 |
Polyisocyanate having an isocyanurate structure are obtained by heating an organic diisocyanate to a temperature of from 100 to 275 DEG C in the presence of a catalytic amount of a co-catalyst mixture comprising: (i) a tertiary amine selected from 3-azabicyclo[3, 2, 2]nonane, 1,4- diazabicyclo[2, 2, 2]octane, 1-azabicyclo[2, 2, 2] octane, 1,8-diazabicyclo[5, 4, 0]undec-7-ene, C1 - C4 substituted homologues thereof and mixtures thereof; and (ii) a low molecular weight (e.g. up to 500) organic hydroxy group-containing compound and/or a carbamic acid ester thereof; for a period of from 0.1 to 360 minutes. |
