| abstract |
The present invention provides a process for preparing isocyanurate from diisocyanate, in which i) prior to the reaction the peroxide content of the diisocyanate to be used is determined, and thereafter ii) a) if the determined peroxide content is greater than 10 mmol/kg, the diisocyanate is subjected to distillative purification until the determined peroxide content is less than or equal to 10 mmol/kg, orb) if the determined peroxide content is less than or equal to 10 mmol/kg, no further action is taken, and iii) distilled diisocyanate with respect to a) and/or untreated diisocyanate with respect to b) is subsequently converted to isocyanurate. |