Patent ID: 6607788
Filing Date: 2003-08-19
Classification: C08L,C09D

Abstract:
Basecoat composition comprising as binder constituents(i) a conventional acrylate dispersion having a content of from 30 to 60% by weight of C1-C8- alkyl (meth)acrylate-containing monomers, from 30 to 60% by weight of vinylaromatic monomers and from 0.5 to 10% by weight of (meth)acrylic acid in the polymer, and (ii) a dispersion of a polymer which is obtained by subjecting an ethylenically unsaturated monomer or a mixture of ethylenically unsaturated monomers to free-radical polymerization in the presence of a water-insoluble initiator or a mixture of water-insoluble initiators and in an aqueous dispersion of a polyurethane resin which has a number-average molecular weight Mn of from 1000 to 30,000 daltons and comprises on average from 0.05 to 1.1 polymerizable double bonds per molecule, the weight ratio between the polyurethane resin and the ethylenically unsaturated monomer or the mixture of ethylenically unsaturated monomers is between 1:10 and 10:1, and (iii) a rheological assistant which comprises a synthetic polymer having ionic and/or associative groups, wherein the proportion of component (i) is between 10 and 80% by weights and the proportion of component (ii) is between 20 and 90% by weight, based in each case on the sum of the proportions by weight of components (i) and (ii), wherein a clearcoat applied to the basecoat demonstrates adhesion to the basecoat following exposure to condensation testing.