Process for preparing polyisocyanates containing iminooxadiazinedione groups
AssigneeBayer MaterialScience AG
InventorFrank Richter
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Abstract
The present invention relates to process for preparing a polyisocyanate containing an iminooxadiazinedione group by trimerizing a portion of the isocyanate groups of a polyisocyanate, which does not contain iminooxadiazinedione groups, in the presence of a catalyst containing an anion corresponding to formula I) (Rf)n—CR′(3-n)—C(O)O− (I) wherein Rf is a perfluorinated C1-C30 radical which is optionally branched, cyclic and/or unsaturated, R′ are identical or different, optionally heteroatom-containing substituents selected from H, C1-C20 alkyl and/or aryl and n is 1 or 2.
Claims6
A process for preparing a polyisocyanate containing an iminooxadiazinedione group which comprises trimerizing a portion of the isocyanate groups of a polyisocyanate, which does not contain an iminooxadiazinedione group, in the presence of a catalyst containing an anion corresponding to formula I)
- (Rf)n—CR′(3-n)—C(O)O− (I)
- wherein
- Rf is a perfluorinated C1-C30 radical which is optionally branched, cyclic and/or unsaturated,
- R′ are identical or different, optionally heteroatom-containing substituents selected from the group consisting of H, C1-C20 alkyl and/or aryl and
- n is 1 or 2.
Dependencies are inferred from the claim text.