C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/08 (2006.01) C08G 18/62 (2006.01) C08G 18/72 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2409038
There is disclosed a three component coating composition comprising: (i) a first component containing at least one acrylic polyol having a carboxyl group content of 0.035 to 2.0 moles/kg, said acrylic polymer being dissolved in volatile organic solvent, (ii) a second component containing a polyisocyanate, and (iii) a third component containing water, at least one of said components also including a base, the base being present in an amount capable of neutralising 0.035 to 0.2 moles of carboxyl groups per kilogram of polyol, the composition being essentially free from other hydrophilizing groups or components. There is also disclosed a method of preparing a coating composition, which comprises mixing the first component, second component and third component shortly before application. There is also disclosed a coated article obtainable by a process therefrom
L'invention concerne une composition de revêtement à trois composants renfermant : (i) un premier composant contenant au moins un polyol acrylique dont la teneur en groupes carboxyle est comprise entre 0,035 et 2,0 moles/kg, ledit polymère acrylique étant dissous dans un solvant organique volatil, (ii) un deuxième composant contenant un polyisocyanate, et (iii) un troisième composant contenant de l'eau, l'un au moins desdits composants comprenant également une base, en quantité suffisante pour neutraliser les 0,035 à 0,2 moles de groupes carboxyle par kilogramme de polyol. La composition selon l'invention est sensiblement exempte de tout autre groupe ou composant d'hydrophilisation. L'invention concerne également un procédé de préparation d'une composition de revêtement de ce type, qui consiste à mélanger le premier, le deuxième et le troisième composant juste avant l'application. L'invention concerne enfin un article enrobé, que l'on obtient conformément audit procédé.
Fenn David Robert
French Andrew
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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