Thixotropic coating agents based on urea adduct of polyamine and monoisocyanate
AssigneeAugust Merckens Nachfolger Kommanditgesellschaft
InventorDieter Brandt
Life of this patent
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Abstract
A thixotropic coating agent, more especially a binder or coating composition, based on a mixtrue of conventional binder-containing systems, optionally in admixture with liquid solvents or diluents, and a thixotropizing agent containing urea groups, wherein the thixotropizing agent is, in part at least, a urea adduct obtained by reacting (a) primary and, optionally, secondary polyamines, (b) monoisocyanate compounds and, optionally, (c) diisocyanate compounds in the presence of at least part of the binder.
Claims19
A thixotropic coating agent comprising a binder and a thixotroping agent;
- said thixotropizing agent comprising a urea adduct obtained by reacting (a) polyamine containing at least two amino groups, and (b) isocyanate including monoisocyanate compounds and diisocyanate compounds in the following mixing ratios:
- 30 to 70 equivalent % of isocyanate groups from the diisocyanate compound to 70 to 30 equivalent % of the monoisocyanate compound.
A thixotropic coating agent comprising a binder and a thixotropizing agent, wherein the thixotropizing agent comprises a urea adduct obtained by reacting (a) polyamine containing at least two amino groups, (b) isocyanate including monoisocyanate, in the presence of the binder;
- the isocyanate being adding in an amount to result in an excess of isocyanate groups over the amino groups;
- the excess of isocyanate groups being reacted with at least one of a monofunctional alcohol, oxime, amine and alkanolamines.
A process for the production of thixotropic coating agents, wherein a liquid binder is mixed with polyamino containing at least two amino groups which are primary or secondary amino groups, and the resulting mixture is reacted with isocyanate including monoisocyanate, added in an amount to result in an excess of isocyanate group over amino groups, for production in the binder of a urea adduct of the polyamine and isocyanate.
Dependencies are inferred from the claim text.