Process for the multi-layer lacquer coating of substrates

Details Process for the multi-layer lacquer coating of substrates Process for the multi-layer lacquer coating of substrates

B - Operations, Transporting

05

D

B05D 1/36 (2006.01) B05D 7/00 (2006.01) C08G 18/62 (2006.01)

Patent

CA 2141191

A process is described for the multi-layer lacquer coating of a substrate by applying a base lacquer layer of an aqueous coating composition onto the optionally precoated substrate and subsequently overcoating with a clear lacquer, which contains: A) at least one copolymer containing hydroxyl groups which is obtainable by reacting a) one or more esters of aliphatic saturated monocarboxylic acids branched in .alpha.-position with one or more epoxide groups or ethylenic double bonds in the alcohol portion with b) one or more alkyl esters of .alpha.,.beta.-ethylenically unsaturated carboxylic acids, c) one or more hydroxyalkyl esters of .alpha.,.beta.-ethylenically unsaturated carboxylic acids, d) optionally one or more .alpha.,.beta.-ethylenically unsaturated carboxylic acids and e) optionally one or more vinyl monomers differing from a), b), c) and d), B) one or more polyisocyanates with an average of at least 1.5 NCO groups per molecule in a quantity such that the equivalent ratio of OH groups in component A) to NCO groups of component B) is 1:1.6 to 1:2.2, C) one or more solvents, optionally together with one or more customary lacquer additives.

Selon un procédé d'application de plusieurs couches de laque sur un substrat, on applique une couche de laque de fond constituée d'un enduit aqueux sur un substrat, le cas échéant, déjà enduit, puis on recouvre la couche de laque de fond d'une laque transparente qui contient: (A) au moins un copolymère contenant des groupes hydroxyles, préparé par réaction de (a) un ou plusieurs esters d'acides monocarboxyliques saturés, aliphatiques, ramifiés en alpha et ayant un ou plusieurs groupes époxyde ou liaisons doubles éthyléniques dans la partie alcool, avec (b) un ou plusieurs esters d'alkyle d'acides carboxyliques éthyléniquement alpha , beta -insaturés, (d), le cas échéant, un ou plusieurs acides carboxyliques éthyléniquement alpha , beta -insaturés, et (e), le cas échéant, un ou plusieurs monomères de vinyle différents de (a), (b), (c) et (d); (B) un ou plusieurs polyisocyanates présentant en moyenne au moins 1,5 groupes NCO dans la molécule, en une quantité telle que le rapport en équivalents entre les groupes OH du composant (A) et les groupes NCO du composant (B) soit compris entre 1:1,6 et 1:2,2.

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