Low-cure powder coatings and methods for using the same

Details Low-cure powder coatings and methods for using the same Low-cure powder coatings and methods for using the same

C - Chemistry, Metallurgy

08

G

C08G 59/68 (2006.01) C08G 18/30 (2006.01) C08G 18/80 (2006.01) C09D 5/03 (2006.01) C09D 163/02 (2006.01)

Patent

CA 2487705

Low-cure powder coating compositions are disclosed. The compositions comprise a polyepoxide and a material having the structure: formula (I) wherein R1 is an organic radical having 6 to 25 carbon atoms; R2 is an organic radical having 1 to 20 carbon atoms; R3 and R4 are independently alkyl or phenyl groups having 1 to 8 carbon atoms; Z is oxygen or nitrogen, and when Z is oxygen R5 is absent and when Z is nitrogen R5 is hydrogen or is formula (II) and n is 1 to 4. The material can optionally be reacted with an acidic hydrogen-containing compound. The compositions are curable without the use of crosslinking agents or accelerators. Methods for coating a substrate using these compositions, and substrates coated thereby, are also disclosed, as are additional catalysts useful for the same purpose.

L'invention concerne des compositions de revêtement en poudre à faible durcissement. Lesdites compositions comprennent un polyépoxide et un matériau représenté par la formule (I). Dans cette formule, R¿1? représente un radical organique comprenant 6 à 25 atomes de carbone; R¿2? représente un radical organique comprenant 1 à 20 atomes de carbone; R¿3? et R¿4? représentent indépendamment des groupes alkyle ou phényle comprenant 1 à 8 atomes de carbone; Z représente oxygène ou azote, et lorsque Z représente oxygène R¿5? est absent, et lorsque Z représente azote R¿5? représente hydrogène ou la formule (II) et n est compris entre 1 et 4. Le matériau peut éventuellement réagir avec un composé comprenant de l'hydrogène acide. Les compositions sont durcissables sans utiliser d'agents de réticulation ou d'accélérateurs. L'invention concerne également des procédés permettant de recouvrir un substrat à l'aide de ces compositions, les substrats recouverts desdites compositions, ainsi que des catalyseurs supplémentaires utilisés aux mêmes fins.

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