Process for preparing polyisocyanates containing iminooxadiazinedione groups

1. 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)

(R f ) n —CR′(3 −n )—C(O)O −   (I)

wherein

R f is a perfluorinated C 1 -C 30 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, C 1 -C 20 alkyl, and aryl; and

n is 1 or 2; and

wherein the counterion to the anion of formula (I) is a quaternary ammonium cation or phosphonium cation.

2. 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)

(R f ) n —CR′(3 −n )—C(O)O −   (I)

wherein

R f is a perfluorinated C 1 -C 30 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, C 1 -C 20 alkyl, and aryl; and

n is 1 or 2; and

wherein said polyisocyanate, which does not contain an iminooxadiazinedione group, has aliphatically and/or cycloaliphatically bound NCO groups; and

wherein the counterion to the anion of formula (I) is a quaternary ammonium cation or phosphonium cation.

3. The process of claim 1 , wherein said catalyst comprises a quaternary ammonium salt or a quaternary phosphonium salt of 3,3,3-trifluoropropanoic acid, 4,4,4,3,3-pentafluorobutanoic acid, 5,5,5,4,4,3,3-heptafluoropentanoic acid, 6,6,6,5,5,4,4,3,3-nonafluorohexanoic acid, 7,7,7,6,6,5,5,4,4,3,3-undecailuoro-heptanoic acid, 8,8,8,7,7,6,6,5,5,4,4,3,3-tridecafluorooctanoic acid, 9,9,9,8,8,7,7,6,6,5,5,4,4,3,3- pentadecafluorononanoic acid, 10,10,10,9,9,8,8,7,7,6,6,5,5,4,4,3,3-heptadecatluorodecanoic acid, 3,3-ditluoroprop-2-enoic acid, 4,4,4,3-tetrafluorobut-2-enoic acid, 5,5,5,4,4,3 -hexafluoropent-2-enoic acid, 6,6,6,5,5,4,4,3 -octafluorohex-2-enoic acid, 7,7,7,6,6,5,5,4,4,3-decafluorohept-2-enoic acid, 8,8,8,7,7,6,6,5,5,4,4,3- dodecafluorooct-2-enoic acid, 9,9,9,8,8,7,7,6,6,5,5,4,4,3-tetradecafluoronon-2-enoic acid, 10,10,10,9,9,8,8,7,7,6,6,5,5,4,4,3-hexadecafluorodec-2-enoic acid, or 3,3- bis(trifluoromethyl)-6,6,6,5,5,4,4-heptafluorohexanoic acid.

4. The process of claim 2 , wherein said catalyst comprises a quaternary ammonium salt or a quaternary phosphonium salt of 3,3,3-trifluoroproparioic acid, 4,4,4,3,3- pentafluorobutanoic acid, 5,5,5,4,4,3,3-heptafluoropentanoic acid, 6,6,6,5,5,4,4,3,3-nonafluorohexanoic acid, 7,7,7,6,6,5,5,4,4,3,3-undecafluoro-heptanoic acid, 8,8,8,7,7,6,6,5,5,4,4,3,3-tridecafluorooctanoic acid, 9,9,9,8,8,7,7,6,6,5,5,4,4,3,3- pentadecafluorononanoic acid, 10,10,10,9,9,8,8,7,7,6,6,5,5,4,4,3,3-heptadecafluorodecanoic acid, 3,3-difluoroprop-2-enoic acid, 4,4,4,3-tetrafluorobut-2-enoic acid, 5,5,5,4,4,3-hexafluoropent-2-enoic acid, 6,6,6,5,5,4,4,3-octalluorohex-2-enoic acid, 7,7,7,6,6,5,5,4,4,3-decafluorohept-2-enoic acid, 8,8,8,7,7,6,6,5,5,4,4,3- dodecafluorooct-2-enoic acid,9,9,9,8,8,7,7,6,6,5,5,4,4,3-tetradecafluoronon-2-enoic acid, 10,10,10,9,9,8,8,7,7,6,6,5,5,4,4,3-hexadecafluorodec-2-enoic acid, or 3,3- bis(trifluoromethyl)-6,6,6,5,5,4,4-heptafluorohexanoic acid.