Blocked polyisocyanates

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/80 (2006.01) C08G 18/34 (2006.01) C08G 18/72 (2006.01) C08G 18/79 (2006.01) C09D 175/04 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2431822

Blocked polyisocyanates, their preparation and use in one-component coating materials. In organic polyisocyanates having at least two isocyanate groups, the isocyanate groups are blocked with OH acidic cyclic ketones of the general formula (I) (see formula I) in which X represents an electron-withdrawing group, R1 and R2 independently of one another represent the radicals H, C1--C20-(cyclo)alkyl, C6-C24-aryl, C1-C20-(cyclo)alkyl ester or C1-C20-(cyclo)alkyl amide, C6-C24-aryl ester or C6-C24-aryl amide, mixed aliphatic/aromatic radicals having 1 to 24 carbon atoms, wherein R1 and R2 may also be part of a 4 to 8-membered ring, n is an integer from 0 to 5. The blocked polyisocyanate system of the invention reacts without elimination of the blocking agent and possesses low crosslinking temperatures.

Polyisocyanates séquencés, leur préparation et leur utilisation dans des revêtements à composant unique. Dans des polyisocyanates organiques comptant au moins deux groupements isocyanate, les groupements isocyanate sont bloqués par des cétones cycliques acides comportant des OH qui réponsent à la formule générale (I) (voir la formule I), où X est un groupement accepteur d'électrons, R1 et R2 sont, indépendamment l'un de l'autre, un radical H, un(cyclo)alkyle en C1 à C20, un aryle en C6 à C24, un ester de cycloalkyle en C1 à C20 ou un cycloalkyl amide en C1 à C20, un ester d'aryle en C6 à C24 ou un arylamide en C6 à C24, des radicaux aliphatiques ou aromatiques mixtes comptant 1 à 24 atomes de carbone, et R1 et R2 peuvent également faire partie d'un cycle formé de 4 à 8 atomes, n est un entier entre 0 et 5. Le système de polyisocyanates séquencés de l'invention réagit sans élimination de l'agent bliquant et ses températures de réticulation sont faibles.

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