Compounds containing isocyanuric groups and terminally blocked isocyanate groups
AssigneeChemische Werke Huls Aktiengesellschaft
InventorsRainer Gras, Elmar Wolf
Life of this patent
Estimating the term…
Abstract
Method for the preparation of compounds containing isocyanuric groups and blocked isocyanate groups from aliphatic and/or cycloaliphatic polyisocyanates; wherein the starting polyisocyanate is first transformed by a known method into a mixture containing an isocyanurate containing at least two free isocyanate groups; and this intermediate product is reacted with monofunctional acidic-hydrogen containing blocking agents; wherein the blocking agent is added in an amount such that one equivalent of agent is added for every equivalent of NCO-group equivalent.
Claims5
A mixture containing isocyanurate and blocked isocyanate groups which comprises:
- at least 10% by weight of an isocyanurate derived from a polyisocyanate selected from the group consisting of 3-isocyanatomethyl-3,5,5-trimethyl-cyclohexylisocyanate, 2,4,4-trimethyl-hexamethylenediisocyanate, and 2,2,4-trimethyl-hexamethylenediisocyanate, containing at least two isocyanate groups blocked with .epsilon.-caprolactam;
- and
- a monomeric polyisocyanate blocked with .epsilon.-caprolactam in such amounts as necessary to complete 100% by weight of said mixture;
- and wherein the unblocked NCO-group content of said mixture is less than 0.5% by weight.
Dependencies are inferred from the claim text.