| abstract |
The present invention relates to a process for the preparation of isocyanurate from diisocyanate, in which i) the peroxide content of the diisocyanate to be used is determined prior to the reaction, and then ii) a) in the event that the peroxide content determined is greater than 10 mmol / kg, the diisocyanate is subjected to purification by distillation until the determined peroxide content is less than or equal to 10 mmol / kg, or b) in the event that the determined peroxide content is less than or equal to 10 mmol / kg, no further action takes place, and iii) then distilled Diisocyanate to a) and / or untreated diisocyanate to b) is converted to isocyanurate. |