Water-borne autodepositing coating compositions

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 3/04 (2006.01) B01F 17/00 (2006.01) B05D 7/16 (2006.01) C08K 5/42 (2006.01) C09D 5/08 (2006.01)

Patent

CA 2183994

A water-borne autodepositing coating composition that has a pH of 1.6 to 5 and contains as essential components a water-dispersible or water-soluble organic coating-forming resin, a liquid dispersion of carbon black, acid, and oxidizing agent, and that may contain metal ions as an optional component, has an excellent storage stability and produces a strongly adherent and highly corrosion-resistant coating when the liquid dispersion of carbon black is an aqueous dispersion in which carbon black is dispersed using as a dispersant a naphthalenesulfonate- formaldehyde condensate.

Une composition hydrique de revêtement à auto-déposition, qui présente un pH de 1,6 à 5, contient essentiellement une résine de revêtement organique dispersable ou soluble dans l'eau, une dispersion liquide de noir de carbone, un acide, un agent oxydant et, à titre facultatif, des ions métalliques. Elle présente une excellente stabilité au stockage et donne un revêtement très adhésif et fortement résistant à la corrosion quand la dispersion liquide de noir de carbone est une dispersion aqueuse où ce noir de carbone est dispersé à l'aide d'un condensat de naphtalènesulfonate-formaldéhyde en guise de dispersant.

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