Coating composition

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 151/00 (2006.01) B05D 1/02 (2006.01) B05D 1/36 (2006.01) B05D 7/16 (2006.01) C08F 265/04 (2006.01) C08F 285/00 (2006.01)

Patent

CA 2240982

A sprayable aqueous coating composition for motor vehicles comprising an aqueous dispersion of addition polymer microparticles having a crosslinked core and a non-crosslinked stabilising mantle containing acid groups, characterised in that the crosslinked core comprises: i) a crosslinked inner core of an addition polymer and ii) a crosslinked outer core of addition polymer which is made from at least 10 % by weight of monomers having a solubility in water of less than 0.1 % by weight, the weight ratio of the inner core to the outer core being in the range 10:90 to 90:10.

L'invention concerne une composition de revêtement aqueuse pulvérisable, pour des véhicules automobiles, comprenant une dispersion aqueuse de microparticules d'un polymère d'addition ayant un noyau réticulé et une coque de stabilisation non réticulée contenant des groupes acides. Le noyau réticulé comprend (i) un noyau interne réticulé, constitué par un polymère d'addition et (ii) un noyau externe réticulé, constitué par un polymère d'addition réalisé avec au moins 10 % en poids de monomères, ayant une solubilité dans l'eau inférieure à 0,1 % en poids. Le rapport entre le poids de la coque interne et celui de la coque externe est dans la plage de 10:90 à 90:10.

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