C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
C07D 229/00 (2006.01) C08G 18/02 (2006.01) C08G 18/16 (2006.01) C08G 18/79 (2006.01) C08K 5/524 (2006.01)
Patent
CA 2244586
The present invention relates to a process for the production of polyisocyanates containing uretdione groups by a) oligomerizing a portion of the isocyanate groups of diisocyanates having aliphatically and/or cycloaliphatically bound isocyanate groups in the presence of catalysts or catalyst systems which accelerate the dimerization of isocyanate groups and in the presence of trisubstituted phosphite stabilizers corresponding to formula (I) (see formula I) b) optionally termination of the oligomerization reaction at a degree of oligomerization of 10 to 60% by adding a catalyst poison and c) optionally removing unreacted diisocyanate by extraction or thin-layer distillation. The present invention also relates to the use of the resulting uretdione polyiso-cyanates as a starting component for polyurethane plastics, particularly as an iso-cyanate component for the production of uretdione hardeners for powder coating compositions.
Freudenberg Ulrich
Halpaap Reinhard
Laas Hans-Josef
Meier-Westhues Hans-Ulrich
Aktiengesellschaft Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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