Back to results
US 4,419,513 AGranted
Isocyanato-isocyanurates, and process for the production thereof
AssigneeBayer Aktiengesellschaft
InventorsPeter Breidenbach, Manfred Bock, Josef Pedain, Gerhard Mennicken
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the preparation of novel isocyanato-isocyanurates by the catalytic and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane in a mole ratio of about 1:4 to 4:1, and to the products produced therefrom. The present invention also relates to the use of these products, optionally in blocked form, as the isocyanate component in polyurethane lacquers.
Claims13
Compounds or mixtures of compounds corresponding to the following general formula:
- ##STR5## wherein R.sup.1, R.sup.2 and R.sup.3, which may be the same or different, represent a hexamethylene radical or a radical obtainable by removing the isocyanate groups from 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane, such that (on statistical average) at least about 20% and at the most about 80% of the radicals R.sup.1, R.sup.2 and R.sup.3 represent a hexamethylene radical;
- and
- n represents an integer, or based on statistical average, a fractional number of from about 1 to 7.
Isocyanurates containing isocyanate groups which are prepared by
- (a) trimerizing a mixture comprising hexamethylene diisocyanate and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane in a molar ratio of from about 4:1 to 1:4 in the presence of a trimerization catalyst,
- (b) terminating the reaction after about 10 to 60% of the isocyanate groups initially present have been trimerized by deactivating the catalyst either by heating the reaction mixture to a temperature above the decomposition temperature of the catalyst and/or by adding a catalyst poison and
- (c) optionally removing the unreacted excess diisocyanate by thin-layer distillation.
Dependencies are inferred from the claim text.