Process for producing isocyanurates by cyclotrimerizing isocyana

Details Process for producing isocyanurates by cyclotrimerizing isocyana Process for producing isocyanurates by cyclotrimerizing isocyana

1992-03-02

1993-06-22

Higel, Floyd D.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

521107, 521108, 521902, 524101, 5253305, 528 45, 528 48, 528 49, 528 51, 528 65, 528 67, 528 69, 528 73, 528 85, 544221, 544222, C07D25132, C07D25134, C08G 1816, C08G 1880

Patent

active

052217434

ABSTRACT:
This invention relates to a process for preparing a trimer by the steps of: (a) cyclotrimerizing a polyisocyanate in the presence a polymer-bound trimerization catalyst by contacting said polyisocyanate with said catalyst at a temperature of between about 20.degree. and about 135.degree. C. in a reaction to form an isocyanurate-containing cyclotrimerized isocyanate wherein a portion of the isocyanate moieties comprising said polyisocyanate are converted to isocyanurate groups, and (b) separating said catalyst from said cyclotrimerized isocyanate in order to stop said reaction after a desired amount of isocyanate moieties in said polyisocyanate have been converted to isocyanurate moieties.

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