Isolation/purification of isocyanate condensates by extraction w

Details Isolation/purification of isocyanate condensates by extraction w Isolation/purification of isocyanate condensates by extraction w

1989-03-22

1989-10-03

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

203 49, B01D 1104

Patent

active

048714607

ABSTRACT:
Isocyanate condensates containing free NCO groups are separated and purified from crude reaction mixtures thereof which include unreacted excess di- or polyisocyanate monomer and at least one isocyanate antagonist, by extracting such crude reaction mixtures with an inert gas, notably carbon dioxide, in either the liquid or supercritical state; the highly purified isocyanate condensates are well adopted for the production of foams, elastomers, adhesives, paints and varnishes.

REFERENCES:
patent: 4306058 (1981-12-01), Copelin

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