Powdered lacquer and its use as an internal coating in...

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 163/00 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2128003

The present invention relates to a powder coating, in particular for internal coating of packaging containers, which is characterized in that it 1.) comprises at least one epoxy resin having an epoxide equivalent weight of from 300 to 5500 and at least one hardener having more than one phenolic hydroxyl group per molecule and a hydroxyl equivalent weight, based on the phenolic OH groups, of from 100 to 500, and 2.) has a particle size distribution such that at least 90 percent by weight of the powder coating particles have a particle size of between 1 and 60 µm, the maximum particle size of the powder coating particles is ~ 100 µm, the mean particle size of the powder coating particles is between 5 and 20 µm and the gradient of the particle distribution curve at the point of inflexion is ~ 100.

L'invention a pour objet un vernis en poudre, notamment pour l'enduction interne de récipients d'emballage, caractérisé 1) en ce qu'il renferme au moins une résine époxy d'un poids équivalent époxy de 300 à 5500 et au moins un durcisseur ayant plus d'un groupe hydroxyle phénolique par molécule et un poids équivalent hydroxyle de 100 à 500, par rapport aux groupes OH phénoliques, et 2) en ce qu'il présente une granulométrie telle qu'au moins 90 % en masse des particules de vernis en poudre présentent une granulométrie, comprise entre 1 et 60 mum, que la granulométrie maximale desdites particules de vernis en poudre soit 100 mum, que leur granulométrie moyenne soit comprise entre 5 et 20 mum, et que la pente de la courbe de granulométrie soit = 100, au point d'inflexion.

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