Coating composition for metal substrates

C - Chemistry – Metallurgy – 23 – C

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C23C 30/00 (2006.01) C09D 1/02 (2006.01) C09D 5/12 (2006.01)

Patent

CA 2460083

The present invention relates to a composition for coating a metal substrate which is intended to be fabricated and overcoated, wherein the binder comprises an acqueous silica sol having a SiO2/M2O mole ratio, with M representing the total of alkali metal and ammonium ions, of at least 6:1, and wherein the ratio of the pigment volume concentration to the critical pigment volume concentration is smaller than 1.

La présente invention se rapporte à une composition de revêtement pour un substrat métallique destiné à être fabriqué et revêtu. Dans ladite composition, le liant comprend un sol de silice aqueux présentant un rapport moléculaire SiO¿2?/M¿2?O, M représentant le total des ions métalliques alcalins et ammonium, d'au moins 6:1, et le rapport concentration pigmentaire volumique/concentration pigmentaire volumique critique est inférieur à 1.

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