Process for denaturing water-dilutable paints and...

C - Chemistry – Metallurgy – 09 – D

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C09D 9/00 (2006.01) C09D 7/00 (2006.01)

Patent

CA 2075134

Process for denaturating water dilutable paints and solvent-based paints, wherein said paints are treated by washing with the assistance of an aqueous denaturation phase whose pH is from 4.5 to 7 and preferably from 5 to 6 and which contains an effective quantity of at least one denaturation agent consisting of an amine molecule of formula (see fig. I) or of formula: (see fig. II) in which the substituents R1 to R7, which may be identical or different, represent: - a hydrogen atom, - a radical of formula -O-Re in which Re is chosen from the group comprising hydrogen and a C1 to C4 saturated aliphatic hydrocarbon chain, it being understood that the substituents R5 to R7 are not simultaneously all hydrogen atoms, or of a hydrate or else of a salt of an organic or inorganic acid salt of said amine molecule, preferably a salt of sulfuric acid, phosphoric acid or hydrochloric acid.

Procédé de dénaturation de peintures diluables dans l'eau ou de peintures à base de solvant, par lequel ces peintures sont traitées par lavage dans une phase de dénaturation aqueuse dont le pH varie de 4,5 à 7, de préférence de 5 à 6, et qui contient une quantité efficace d'au moins un agent de dénaturation comprenant une molécule d'amine correspondant à la formule (voir figure 1) ou la formule (voir figure II) dans laquelle les substituants R1 à R7, qui peuvent être identiques ou différents, correspondent à : - un atome d'hydrogène, - un radical de formule -O-Re où Re est choisi dans le groupe comprenant un hydrogène et une chaîne aliphatique saturée C1-C4, étant sous-entendu que les radicaux R5 à R7 ne sont pas simultanément tous des atomes d'hydrogène, ou d'un hydrate ou autre composé d'un sel d'un sel acide organique ou inorganique de la dite molécule d'amine, de préférence un sel de l'acide sulfurique, de l'acide phosphorique ou d'un acide chlorhydrique.

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