Reactive oligomers for isocyanate coatings

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/04 (2006.01) C08G 18/42 (2006.01) C08G 18/62 (2006.01) C09D 175/06 (2006.01)

Patent

CA 2304529

The invention is directed to a two-pack solvent-based ambient curable coating composition comprising a binder of a hydroxyl and cross-linking components. The hydroxyl component includes a linear or branched cycloaliphatic moiety-containing reactive oligomer or blend of oligomers with a weight average molecular weight not exceeding 3,000, a polydispersity not exceeding about 1.7 with at least 2 hydroxyl groups, at least 1, on average, being a primary hydroxyl group. The reactive oligomer is formed by the reaction of an oligomeric acid with monofunctional epoxy. The cross-linking component includes one or more of an oligomeric cross-linker containing at least 2 isocyanate groups. The coating composition of the invention is particularly suited in automotive refinish coatings.

L'invention concerne une composition de revêtement à base de solvant séchant à température ambiante et conditionnée en emballage double; la composition comprend un liant à base d'un composant hydroxyle et de composants de réticulation. Le composé hydroxyle comprend un oligomère réactif cycloaliphatique linéaire ou ramifié comprenant un groupe fonctionnel, ou un mélange d'oligomères, et possédant un poids moléculaire moyen inférieur ou égal à 3 000, une polydispersité inférieure ou égale à environ 1,7 avec au moins deux groupes hydroxyles dont au moins un en moyenne est un groupe hydroxyle primaire. L'oligomère réactif est formé par réaction d'un acide oligomère avec un époxy monofonctionnel. Le composant de réticulation comprend un ou plusieurs agents de réticulation oligomères, qui comprend au moins deux groupes d'isocyanate. La composition de revêtement de cette invention est tout particulièrement destinée aux peintures de finition pour automobiles.

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