Method for producing a multi-coat colour and/or effect paint system

摘要

A method for producing a multicoat color and/or effect paint system comprising the use of a pigmented aqueous basecoat material comprising 0.05% to 10% by weight, based on the total amount of the pigmented aqueous basecoat material, of an associative thickener (B) composed of at least one compound of the following formula (I):;with n=0 to 50,where R1=;with m=0 to 10, o=0 to 100where R2=H or R3,where R3=;with p=0 to 50,where R in each case independently of any other is a linear or branched hydrocarbon radical or a cyclic hydrocarbon radical having optionally linear and/or branched groups and containing 8 to 24 carbon atoms,with the proviso that for not more than 50% by weight of the compounds of the formula (I), m=0 and R2=H.

主权项

1. A method for producing a multicoat color and/or effect paint system comprising
(1) applying to a substrate a pigmented aqueous basecoat material comprising at least one polyurethane resin (A) as binder and at least one color and/or effect pigment, (2) forming a polymer film from the basecoat material applied in stage (1) to produce a basecoat film, (3) applying a clearcoat material to the basecoat film, and then (4) curing the basecoat film together with the clearcoat material applied in stage (3), wherein the pigmented aqueous basecoat material applied in stage (1) comprises 0.05% to 10% by weight, based on the total amount of the pigmented aqueous basecoat material, of an associative thickener (B) different from the polyurethane resin (A), the associative thickener (B) comprising at least one compound of the following formula (I): wherein n=0 to 50, where R1= with m=0 to 10, o=0 to 100 where R2=H or R3, where R3= with p=0 to 50, where R in each case independently of any other is a linear or branched hydrocarbon radical or a cyclic hydrocarbon radical having optionally linear and/or branched groups and containing 8 to 24 carbon atoms, with the proviso that for not more than 50% by weight of the compounds of the formula (I), m=0 and R2=H, where the polyurethane resin (A) is prepared using monomers which contain an olefinically unsaturated group and also at least one group reactive toward isocyanate groups, and the polyurethane resin (A) is a polyurethane resin grafted with olefinically unsaturated compounds.