Process for the production of isocyanurate polyisocyanates, and

Details Process for the production of isocyanurate polyisocyanates, and Process for the production of isocyanurate polyisocyanates, and

1979-05-04

1981-03-10

Ford, John M.

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544222, C07D25134

Patent

active

042555698

ABSTRACT:
The instant invention is directed to a process for the production of isocyanate polyisocyanates containing at least 50%, by weight, of tris-isocyanatomonoisocyanurates and at most 3%, by weight, of isocyanurate-free diisocyanate. The process comprises catalytically trimerizing the organic diisocyanates free from isocyanurate groups and terminating the trimerization reaction by deactivation of the catalyst after 5 to 40% of the isocyanate groups of the isocyanurate-free diisocyanate have been trimerized. The unreacted isocyanurate-free diisocyanate is then distilled off in the presence of from 1 to 30%, by weight, based on the end product obtained as distillation residue, of an inert liquid distillation aid which boils at a temperature at least 50.degree. C. above the boiling point of the isocyanurate-free diisocyanate.
The invention is also directed to the products produced by this process.

REFERENCES:
patent: 2952665 (1960-09-01), Bunge et al.
patent: 3517002 (1970-06-01), Heiss
patent: 3619338 (1971-11-01), Gilman et al.
patent: 3631000 (1971-12-01), Argabright et al.
patent: 3641024 (1972-02-01), Argabright et al.
patent: 3773695 (1973-11-01), Argabright et al.
patent: 3919218 (1975-11-01), Schmitt et al.
patent: 3996223 (1976-12-01), Gupta et al.

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