Process for making a multi-layer protective and/or...

B - Operations – Transporting – 05 – D

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Details

B05D 1/36 (2006.01) B05D 5/06 (2006.01) B05D 7/00 (2006.01) B05D 7/26 (2006.01) C09D 143/04 (2006.01)

Patent

CA 2070394

The present invention relates to a process in which 1.) a water-dilutable basecoat composition is applied which contains at least one water-dilutable binder, metallic pigments, if desired color pigments, if desired conventional auxiliaries and additives and up to 20% by weight of organic solvents, 2.) a polymer film is formed from this basecoat composition, 3.) a transparent topcoat containing a polymer containing silyl groups and obtainable by copolymerization of P1) 0.1 to 40% by weight of ethylenically unsaturated silane monomers of the general formula (see fig. I) where R1 is alkyl, aryl, acyl, aralkyl having 1 to 10 carbon atoms R2 is an organic radical having a polymerizable double bond X is a hydrolyzable group n is 1, 2 or 3 P2) 5 to 30% by weight preferably 8 to 25% by weight, of monomers having at least 2 polymerizable ethylenically unsaturated double bonds and p3) 30 to 90% by weight of ethylenically unsaturated monomers without groups having active hydrogen, is applied to this base layer 4.) and the top layer is cured together with the base layer.

L'invention a pour objet un procédé consistant: 1) à appliquer une composition d'enduit de base diluable à l'eau, renfermant au moins un liant diluable à l'eau, des pigments métalliques, éventuellement des pigments colorés, ainsi que des produits auxiliaires et des adjuvants, et jusqu'à 20 % en poids de solvant organique, 2) à former un film polymère à partir de cette composition d'enduit de base, 3) à appliquer sur cette couche de base, un vernis de finition transparent, renfermant un polymérisat présentant des groupes silyliques, obtenu par copolymérisation de p1) 0,1 à 40 % en poids de monomères de silane insaturés éthyléniquement, de formule générale (I) où R1 est un alkyle, aryle, acyle, aralkyle de 1 à 10 atomes de C, R2 est un résidu organique à double liaison polymérisable, X est un groupe hydrolysable, n = 1, 2 ou 3; p2) 5 à 10 % en poids, de préférence 8 à 25 % en poids de monomères ayant au moins deux doubles liaisons polymérisables insaturées éthyléniquement; p3) 30 à 90 % en poids de monomères insaturés éthyléniquement, exempts de groupes à hydrogène actif, 4) à laisser durcir la couche de recouvrement, conjointement avec la couche de base.

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