Process for modifying isocyanates with use of cyclic ammonium salts as catalyst

Abstract

The invention relates to a process for modifying isocyanates where at least one organic isocyanate with NCO functionality >1 is oligomerized in the presence of at least one catalyst, characterized in that the catalyst comprises, as isocyanatemodification catalysts, at least one cyclic ammonium salt having a cation of the formula (I) (formula I), where the N-containing substituents R1 and R2 are mutually independently identical or different aliphatic, cycloaliphatic, aromatic or araliphatic C, to C20 moieties which are saturated or unsaturated, linear or branched, optionally substituted and/or interrupted by heteroatoms from the group of oxygen, sulphur and nitrogen, and Y is a substituted or unsubstituted, linear or branched C2 to C20 segment optionally interrupted by heteroatoms from the group of oxygen, sulphur and nitrogen or else intempted by aromatic rings, and optionally containing other rings. The invention further relates to the use of such a catalyst.

Dependencies are inferred from the claim text.