Polyisocyanate mixtures, a process for their preparation and...

Details Polyisocyanate mixtures, a process for their preparation and... Polyisocyanate mixtures, a process for their preparation and...

C - Chemistry, Metallurgy

07

D

C07D 251/34 (2006.01) C07C 265/14 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/28 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08L 79/00 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2066481

The present invention relates to polyisocyanate mixtures having a) an average isocyanate functionality of at least 4.1, b) a (cyclo)aliphatically bound isocyanate group content (calculated as NCO, molecular weight = 42) of 12.0 to 20.5% by weight, c) a chemically incorporated carboxyl group content (calculated as COOH, molecular weight = 45) of 0.01 to 5.0% by weight and d) an ethylene oxide unit content arranged within terminal or lateral polyether chains of 0 to 10% by weight (calculated as C2H4O, molecular weight = 44). The present invention also relates to a process for the preparation of these polyisocyanate mixtures and to their use as cross-linking agents in aqueous coating compositions containing water soluble or dispersible binders or binder components.

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