Polyisocyanates containing uretidione and allophanate groups

Details Polyisocyanates containing uretidione and allophanate groups Polyisocyanates containing uretidione and allophanate groups

C - Chemistry, Metallurgy

08

G

C08G 18/79 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2200567

Disclosed herein is a liquid, monoallophanate-containing, monouretidione- containing polyisocyanate composition characterized by having (i) an isocyanate functionality of between 2.8 and 6.5, (ii) a free NCO content of 10 % to 47 % by weight, (iii) a viscosity of less than 1000 cp, and (iv) the presence of monouretidione and monoallophanate groups in a molar ratio of said monouretidione groups to said monoallophanate groups of between about 20:1 and about 1:5. Also disclosed is a process for producing the above compositions, as well as their use, optionally in blocked form in one or two component coating compositions.

Composition liquide de polyisocyanate renfermant un monoallophanate et un monourétidione et se caractérisant par le fait qu'elle présente (i) une fonctionnalité de l'isocyanate se situant entre 2,8 et 6,5; (ii) une teneur en NCO libre de 10 à 47 % en poids; (iii) une viscosité inférieure à 1000 cp; et (iv) la présence de groupes monourétidione et monoallophanate dans un rapport molaire des groupes monourétidiones par rapport aux groupes monoallophanates se situant entre 20 : 1 et 1 : 5. L'invention porte également sur un procédé d'élaboration des compositions précitées, ainsi que sur leur utilisation, facultativement sous forme de bloc dans des compositions de revêtement à 1 ou 2 composants.

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