Isocyanurate group-and terminally blocked isocyanate group-containing compounds
AssigneeChemische Werke Huls Aktiengesellschaft
InventorsRainer Gras, Elmar Wolf
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AssigneeChemische Werke Huls Aktiengesellschaft
InventorsRainer Gras, Elmar Wolf
Estimating the term…
A method for the production of blocked isocyanate- and isocyanurate group-containing compounds which comprises reacting a monomeric cycloaliphatic polyisocyanate to form an intermediate mixture comprising an isocyanurate containing at least two free isocyanate groups; and blocking the intermediate isocyanurate mixture with dimethylketoxime at 50.degree.-120.degree. C., wherein the amount of said dimethylketoxime is such that one equivalent of NCO group reacts with one equivalent of the dimethylketoxime. A mixture containing isocyanurate and blocked isocyanate groups which comprises at least 10% by weight of a cycloaliphatic isocyanurate containing at least two isocyanate groups blocked with dimethylketoxime and a monomeric polyisocyanate blocked with dimethylketoxime in such amounts as necessary to complete 100% by weight of the mixture, and wherein the unblocked NCO-group content of the monomeric polyisocyanate is less than 0.5% by weight.
A method for the production of a blocked isocyanate- and isocyanurate group-containing mixtures which comprises:
A mixture containing isocyanurate and isocyanate groups which comprises:
A mixture containing isocyanurate and blocked isocyanate groups which comprises:
Dependencies are inferred from the claim text.