Coatings based on polyisocyanates and aliphatic aldimines...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 175/12 (2006.01)

Patent

CA 2221676

The present invention is directed to coatings that have good scratch and mar resistance and are prepared from coating compositions containing a) a polyisocyanate component containing i) 0 to 25% by weight of allophanate groups (calculated as HC2N2O3, MW 101) and/or ii) 0 to 25% by weight of uretdione groups (calculated as C2N202, MW 84), b) an aldimine corresponding to the formula X1-[N=CHCH(R1)(R2)]n wherein X1 represents the residue which is inert towards isocyanate groups at a temperature of 100°C or less and is obtained by removing the amino groups from an aliphatic polyamine having n amino groups and a molecular weight of less than 400 and R1 and R2 may be identical or different and represent organic groups which are inert towards isocyanate groups at a temperature of 100°C or less, or R1 and R 2 together with the .beta.-carbon atom form a cycloaliphatic or heterocyclic ring, n represents an integer with a value of at least 2, wherein components a) and b) are present in an amount sufficient to provide an equivalent ratio of isocyanate groups to aldimine groups of 0.5:1 to 5:1.

L'invention porte sur des revêtements résistant bien aux éraflures et à la déformation. Ils sont préparés à partir de compositions renfermant a) un polyisocyanate contenant i) 0 à 25 % en poids de groupes allophanates (calculé en HC2N2O3, PM 101) et (ou) ii) 0 à 25 % en poids de groupes uretdiones (calculé en C2N202, PM 84), b) une aldimine correspondant à la formule X1-¢N=CHCH(R1)(R2)!n, où X1 représente le résidu inerte vis-à-vis des groupes isocyanates à une température de 100 degrés C ou moins, résultant de l'élimination des groupes amino dans une polyamine aliphatique renfermant n groupes amino et de poids moléculaire inférieur à 400, R1 et R2 peuvent être identiques ou différents en représentant des groupes organiques inertes vis-à-vis des groupes isocyanates à une température de 100 degrés C ou moins, ou R1 et R 2 forment ensemble avec l'atome de carbone en bêta un cycle aliphatique ou un hétérocycle, n est un entier d'au moins 2; les constituants a) et b) sont présents en quantités suffisantes pour obtenir un rapport d'équivalents en groupes isocyanates sur équivalents en groupes aldimines de 0,5:1 à 5:1.

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