Thermosetting powder coating systems

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 63/181 (2006.01) C09D 5/46 (2006.01) C09D 7/12 (2006.01) C09D 167/02 (2006.01)

Patent

CA 2346963

The present invention concerns thermosetting powder coating systems based on carboxyl- functional polyester resins, .beta.-hydroxyalkylamides and/or polyepoxides, as well as optionally ordinary pigments, fillers and additives, their production and use, protective layers from them and objects provided with such protective layers. The invention also concerns polyester resins that are suitable for formulation of thermosetting powder coating systems. The polyester resins have an acid number from 15 to 70 mg KOH/g, a hydroxyl number of a maximum of 10 mg KOH/g, and a glass transition point of at least 35°C. These polyester resins contain up to 80 mol%, in reference to the total amount of all employed dicarboxylic acids, isophthalic acid and 0.5 to 30 mol%, in reference to the total amount of all employed diols, 1,5-pentanediol and/or at least one 1,5-pentanediol provided with at least one alkyl substituent and/or at least one 3-oxa derivative of the aforementioned diol.

L'invention concerne des systèmes thermodurcissables de revêtements en poudre, comprenant des résines de polyester à fonction carboxyle, des beta -hydroxyalkylamines et/ou des polyépoxydes et éventuellement les pigments, charges et additifs habituels; ainsi que leur procédé de fabrication et leur utilisation, les revêtements protecteurs ainsi produits et les articles comportant lesdits revêtements. L'invention concerne également des résines de polyester convenant pour la formulation de systèmes thermodurcissables de revêtements en poudre. Les résines de polyester ont un indice d'acidité compris entre 15 et 70 mg KOH/g, un indice d'hydroxylation de 10 mg KOH/g maximum et une température de transition vitreuse de 35 DEG C minimum. Elles contiennent jusqu'à 80 mol. %, par rapport à la quantité totale de tous les acides dicarboxyliques utilisés, d'acide isophtalique et 0,5 à 30 mol. %, par rapport à la quantité totale de diols utilisés, de pentanediol 1,5 et/ou au moins un pentanediol 1,5 alkyle-substitué et/ou au moins un dérivé 3-oxa desdits diols.

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