Powder paint and use thereof for coating the inside of...

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 175/04 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/61 (2006.01) C08G 18/62 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2235763

The present invention concerns a powder paint intended in particular for coating the inside of packaging containers and characterised in that: 1) it contains at least one polyhydroxy-functional resin with a hydroxyl number between 5 and 200 mg KOH/g and at least one polyisocyanate hardener with more than one isocyanate group per molecule; and 2) it has a grain size distribution such that at least 90 wt % of the powder particles are between 1 and 60 microns in size, the maximum particle size is not greater than 100 microns, the mean particle size is between 5 and 20 microns and the steepness of the grain distribution curve at the turning point is at least 100.

L'invention concerne une peinture en poudre, notamment pour le revêtement intérieur de contenants d'emballage, caractérisée en ce que 1) elle contient au moins une résine à fonction polyhydroxy avec un indice d'hydroxyle compris entre 5 et 200 mg KOH/g et au moins un durcisseur de polyisocyanate avec au moins un groupe isocyanate par molécule et en ce que 2) elle présente une répartition granulométrique telle qu'au moins 90 % en masse des particules de peinture en poudre possèdent une dimension de particule comprise entre 1 et 60 µm, que la dimension maximale des particules de peinture en poudre est inférieure ou égale à 100 µm, que la dimension moyenne de particules de peinture en poudre est comprise entre 5 et 20 µm et que la pente de la courbe de répartition granulométrique est supérieure ou égale à 100 au point d'inflexion.

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