Process for the production of multilayered coatings

Details Process for the production of multilayered coatings Process for the production of multilayered coatings

B - Operations, Transporting

05

D

B05D 1/36 (2006.01) B05D 7/00 (2006.01) B05D 7/16 (2006.01) C09D 125/14 (2006.01) C09D 133/06 (2006.01) C08L 33/06 (2006.01)

Patent

CA 2241071

The invention relates to a process for the production of a multilayered coating on a substrate surface, during which (A) an aqueous coating composition (ii) containing an aqueous polymer dispersion in the form of a film-forming agent is applied to a substrate surface as a base layer (II) and coated with an aqueous base coating (i); (B) the composition applied in step (A) is dried; (C) a suitable, transparent covering coating composition is applied to the resulting base layer (II); and (D) the base layers (I) and (II) are baked along with the covering layer. The process is characterised in that the base coating composition (ii) contains an aqueous polymer dispersion which contains (x) an acrylate polymer based on 30 to 60 % by weight of C1-C8- alkyl(meth)acrylate monomers, 30 to 60 % by weight of vinyl aromatic monomers and 0.5 to 10 % by weight of (meth)acrylic acid and (y) a thickener acting in a non-associative manner and containing an acrylate copolymer based on C1-C6- alkyl(meth)acrylate and (meth)acrylic acid.

L'invention a pour objet un procédé d'obtention d'un revêtement multicouche sur la surface d'un substrat, selon lequel (A) on applique comme couche de base (II), sur une surface du substrat enduite d'un revêtement de base aqueux (i), une composition de revêtement aqueuse (ii) renfermant, comme agent filmogène, une dispersion polymère aqueuse, (B) on sèche la composition appliquée à l'étape (A), (C) on applique sur la couche de base (II) ainsi obtenue une composition formant une couche de recouvrement transparente appropriée, et (D) on effectue la cuisson des couches de base (I) et (II) conjointement avec la couche de recouvrement. Ce procédé est caractérisé en ce que la composition de revêtement de base (ii) renferme une dispersion polymère aqueuse contenant (x) un polymère acrylate à base de 30 à 60 % en poids de monomères d'alkyl (C¿1?-C¿8?)(méth)acrylate, 30 à 60 % en poids de monomères vinylaromatiques et 0,5 à 10 % en poids d'acide (méth)acrylique, et (y) un épaississant à effet non associatif, renfermant un copolymère acrylate à base d'alkyl (C¿1?-C¿6?)(méth)acrylate et d'acide (méth)acrylique.

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