Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1980-03-28
1981-12-15
Cockeram, H. S.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
252182, 528 67, 544193, 544222, C08G 1880, C08G 1879
Patent
active
043060510
ABSTRACT:
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.
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Gras Rainer
Wolf Elmar
Chemische Werke Huls AG
Cockeram H. S.
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