Process for making multilayer coatings with a strippable...

B - Operations – Transporting – 05 – D

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B05D 5/00 (2006.01) B05D 7/00 (2006.01)

Patent

CA 2271627

In a process for overcoating a substrate having a cured primer coating with a curable topcoat which when cured is swellable by a stripping solvent, a non- volatile polar material is applied to the primed substrate from an aqueous liquid vehicle before coating with the topcoat. The polar material facilitates the removal of the topcoat from the primer by the stripping solvent, as is required for example when repainting aircraft. The polar material has sufficiently high affinity for the primer surface that it is not washed off the primer surface by water rinsing or by application of the topcoat paint.

Ce procédé de dépôt de couche supérieure sur un substrat possédant une première couche durcie, consiste à déposer une couche supérieure pouvant durcir et qui, une fois durcie, peut gonfler sous l'effet d'un solvant d'arrachage, et à appliquer une matière polaire non volatile sur le substrat doté de la première couche, avant dépôt de la couche supérieure. Cette matière polaire non volatile facilite l'enlèvement, à l'aide du solvant d'arrachage, de la couche supérieure à partir de la première couche, comme cela est nécessaire, par exemple, lorsque l'on repeint un avion. La matière polaire présente une affinité avec la surface de la première couche suffisamment forte pour n'être pas effacée de la surface de cette première couche par un rinçage à l'eau ou par l'application de la couche supérieure de peinture.

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