Coating agent, process for producing the same and its use,...

C - Chemistry – Metallurgy – 09 – D

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C09D 167/00 (2006.01)

Patent

CA 2262373

A coating agent which contains one or several hydroxyl group-containing, optionally modified polyesters and one or several cross-linking agents which react with the hydroxyl groups is characterised in that the coating agent contains as binder a mixture of A1) 35 to 95 wt % one or several hydroxyl groups-containing polyesters (A1) with an OH number from 15 to 210 mgKOH/g, an acid number from to 120 mgKOH/g and a number average molecular weight from 500 to 6000 g/mol; A2) Z to 50 wt % one or several water-dilutable, modified epoxy resin esters (A2); and A3) 0 to 20 wt % one or several water- dilutable, hydroxyl groups-containing, epoxy resin-modified alkyd resins (A3). The sum of the weight percentages of components (A1) to (A3) equals 100 wt % and the weight percentages are given in relation to the solids in the binders (A1) to (A3).

L'invention concerne un agent de revêtement contenant un ou plusieurs polyesters éventuellement modifiés renfermant des groupes hydroxyle, ainsi qu'un ou plusieurs réticulants réactifs vis-à-vis des groupes hydroxyle. Cet agent est caractérisé en ce qu'il contient comme liant un mélange de A1) 35 à 95 % en poids d'un ou de plusieurs polyesters (A1), renfermant des groupes hydroxyle, avec un indice OH de 15 à 210 mgKOH/g, un indice d'acidité de 10 à 120 mgKOH/g et un poids moléculaire moyen en nombre de 500 à 6000 g/mol; A2) 2 à 50 % en poids d'un ou de plusieurs esters de résine époxy (A2) modifiés, diluables dans l'eau et A3) 0 à 20 % en poids d'une ou de plusieurs résines alkydes (A3) modifiées par des résines époxy, diluables dans l'eau et contenant des groupes hydroxyle. La somme des proportions pondérales respectives des constituants (A1) à (A3) s'élève à 100 % en poids et ces proportions pondérales se rapportent respectivement aux extraits secs des liants (A1) à (A3).

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