Polyisocyanates containing acylurea groups, a process for their production and their use
AssigneeBayer Aktiengesellschaft
InventorsChristoph Gürtler, Martin Brahm
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for preparing polyisocyanates containing acylurea groups by reacting isocyanates corresponding to formula (I) R—(NCO)n, (I) wherein R represents an n-valent linear or branched aliphatic group or cycloaliphatic group having 4 to 30 carbon atoms or an aromatic group having 6 to 24 carbon atoms and n is 1, 2, 3 or 4, with aliphatic and/or aromatic carboxylic acids in the presence of a metal salt catalyst at a temperature of 20 to 220° C. The present invention also relates to the reaction products (polyisocyanates) prepared by this process and to their use as binders for polyurethane coating compositions.
Claims10
A process for preparing a polyisocyanate containing acylurea groups which comprises reacting an isocyanate corresponding to formula (I)
- R—(NCO)n (I),
- wherein
- R represents an n-valent linear or branched aliphatic group or cycloaliphatic group having 4 to 30 carbon atoms or an aromatic group having 6 to 24 carbon atoms and
- n is 1, 2, 3 or 4,
- with an aliphatic and/or aromatic carboxylic acid in the presence of a metal-salt catalyst selected from the group consisting of salts of group IIA elements, salts of group IIB elements and salts of lanthanides, at a temperature of 20 to 220° C.
Dependencies are inferred from the claim text.