Base coat and its use for producing color and/or effect-producing base coatings and multi-layer coatings

摘要

The use of a copolymer (A) preparable by free-radical polymerization ofa) at least one olefinically unsaturated monomer andb) at least one olefinically unsaturated monomer different than the olefinically unsaturated monomer (a) and of the general formula Iin which the radicals R<1>, R<2>, R<3 >and R<4 >each independently of one another are hydrogen atoms or substituted or unsubstituted alkyl, cycloalkyl, alkylcycloalkyl, cycloalkylalkyl, aryl, alkylaryl, cycloalkylaryl, arylalkyl or arylcycloalkyl radicals, with the proviso that at least two of the variables R<1>, R<2>, R<3 >and R<4 >are substituted or unsubstituted aryl, arylalkyl or arylcycloalkyl radicals, especially substituted or unsubstituted aryl radicals, in an aqueous medium, in a basecoat material used to produce color and/or effect basecoats BL and multicoat color and/or effect coating systems ML.