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Process for the purification and isolation of isocyanate condensates by extraction with liquid or supercritical CO2
Process for the purification and isolation of isocyanate condensates by extraction with liquid or supercritical CO2
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机译:通过液态或超临界CO2萃取纯化和分离异氰酸酯缩合物的方法
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摘要
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.
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