Polyisocyanate mixture, a process for its preparation and...

Details Polyisocyanate mixture, a process for its preparation and... Polyisocyanate mixture, a process for its preparation and...

C - Chemistry, Metallurgy

08

G

C08G 18/02 (2006.01) C07D 229/00 (2006.01) C07D 251/34 (2006.01) C08G 18/75 (2006.01) C08G 18/79 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2051509

The present invention relates to polyisocyanate mixtures prepared from 1,6-diisocyanatohexane(HDI)and 1-isocyanato- 3,3,5-trimethyl-5-isocyanatomethyl cyclohexane (IPDI), which have a uretdione content (calculated as C2N2O2) of 8 to 25% by weight and an isocyanurate content (calculated as C3N3O3) of not more than 24% by weight and contain a) 20 to 60% by weight of uretdione diisocyanates b) 0 to 40% by weight of isocyanurate triisocyanates c) 15 to 60% by weight of higher homologues of the polyisocyanates of components a) and b) containing more than one uretdione ring and/or isocyanurate ring and d) a total of not more than 1% by weight of (HDI) and (IPDI). The present invention also relates to a process for the preparation of these polyisocyanate mixtures and to their use, optionally blocked with blocking agents for isocyanate groups, as the isocyanate component in polyurethane coating compositions.

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