At least three-part coating agent, process for producing it...

Details At least three-part coating agent, process for producing it... At least three-part coating agent, process for producing it...

C - Chemistry, Metallurgy

09

D

C09D 133/02 (2006.01) C08G 18/08 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/40 (2006.01) C08G 18/42 (2006.01) C08G 18/62 (2006.01) C08G 18/64 (2006.01) C09D 167/00 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2190286

The present invention relates to a coating composition comprising at least three components, characterized in that component (I) contains as binder at least one acrylate copolymer which is dissolved or dispersed in organic solvent and has a number-average molecular weight of between 1000 and 30,000, an OH number of from 40 to 200 and an acid number of from 5 to 150 and/or polyester resin having a number-average molecular weight of between 1000 and 30,000, an OH number of from 30 to 250 and an acid number of from 5 to 150 and/or polyurethane resin having a number-average molecular weight of between 1000 and 30,000, an OH number of from 20 to 200 and an acid number of from 5 to 150, and, if desired, a further binder, the binder components being selected such that a 50% strength solution of the binder in ethoxyethyl propionate has a viscosity at 23°C of <= 2.5 dPa.s, component (II) contains at least one nonblocked polyisocynate [sic] as crosslinking agent, and component (III) is essentially binder-free and contains water.

L'invention a pour objet un agent de revêtement comprenant au moins trois composants, caractérisé en ce que le composant (I) contient, en tant que liant, au moins un copolymère d'acrylate dissous ou dispersé dans un solvant organique, d'un poids moléculaire moyen au nombre compris entre 1.000 et 30.000, d'un indice OH de 40 à 200 et d'un indice d'acide de 5 à 150 et/ou une résine polyester d'un poids moléculaire moyen au nombre compris entre 1.000 et 30.000, d'un indice OH de 30 à 250 et d'un indice d'acide de 5 à 150 et/ou une résine polyuréthanne d'un poids moléculaire moyen au nombre compris entre 1.000 et 30.000, d'un indice OH de 20 à 200 et d'un indice d'acide de 5 à 150 et, éventuellement, un autre liant, les composants liants précités étant choisis de façon qu'une solution à 50 % du liant dans de l'éthoxyéthylpropionate présente une viscosité <= 2,5 dPa.s à 23 ~C, en ce que le composant (II) contient, en tant qu'agent de réticulation, au moins un polyisocyanate non inhibé, et en ce que le composant (III) est essentiellement exempt de liant et contient de l'eau.

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