Improved coating composition

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 5/02 (2006.01)

Patent

CA 2596140

A pigmented, aqueous coating composition comprising i) an aqueous dispersion of non-crosslinkable addition oligomer of weight average molecular weight of from 5000 to 15000 Daltons and calculated Fox Tg greater than 0~C and less than 50~C ii) an aqueous dispersion of addition polymer of weight average molecular weight greater than 53,000 Daltons, calculated Fox Tg greater than 10~C and less than 40~C and mean particle diameter of less than 150 nanometers, where the ratio of i):ii) is from 0.25:1 to 2.70:1, based on % weight dispersion solids.

La présente invention se rapporte à une composition de revêtement aqueuse pigmentée, qui contient : (i) une dispersion aqueuse d'un oligomère d'addition non réticulable présentant un poids moléculaire moyen en poids compris entre 5000 et 15 000 Daltons et une Tg de Fox calculée supérieure à 0 °C et inférieure à 50 °C ; (ii) une dispersion aqueuse d'un polymère d'addition présentant un poids moléculaire supérieur à 53 000 Daltons, une Tg de Fox calculée supérieure à 10 °C et inférieure à 40 °C, et un diamètre de particule moyen inférieur à 150 nanomètres. Le rapport entre (i) et (ii) est compris entre 0,25:1 et 2,70:1, sur la base du pourcentage massique des solides des dispersions.

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