Mixed-blocked polyisocyanates and uses thereof

Details Mixed-blocked polyisocyanates and uses thereof Mixed-blocked polyisocyanates and uses thereof

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2434208

Mixed and hybrid blocked polyisocyanates as cross linking agents in coating compositions, having at least one 1,3-dicarbonyl blocking group and at least one thermally active blocking group such that the molar ratio of 1,3- dicarbonyl blocking groups to thermally active blocking groups is in the range of from 4:1 to 1:9, offer improved intercoat adhesion when overcoated and good stability.

L'invention concerne des polyisocyanates hybrides séquencés et mélangés utilisés en tant qu'agent de réticulation dans des compositions de revêtement, comprenant au moins un groupe bloquant 1,3-dicarbonyle et au moins un groupe bloquant thermiquement actif, de telle sorte que le rapport molaire des groupes bloquants 1,3-dicarbonyle sur les groupes bloquants thermiquement actifs soit compris entre 4:1 et 1:9. Ces polyisocyanates permettent d'obtenir une meilleure adhérence intercouche lorsqu'ils sont revêtus d'un second enrobage, ainsi qu'une bonne stabilité.

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