Base coating composition of a polyacrylate resin containing branched hydroxyl containing cycloaliphatic monomer units and its use in processes to produce a multi-layer lacquering system

摘要

PCT No. PCT/EP97/03514 Sec. 371 Date Jan. 25, 1999 Sec. 102(e) Date Jan. 25, 1999 PCT Filed Jul. 3, 1997 PCT Pub. No. WO98/04642 PCT Pub. Date Feb. 5, 1998The present invention relates to a coating composition comprising at least one hydroxyl-containing polyacrylate resin as binder component (A) and at least one crosslinking agent (B), component (A) being obtainable by free-radical polymerization of: (a) from 5 to 80% by weight of at least one cycloaliphatic ester of (meth)acrylic acid, (b) from 10 to 50% by weight of at least one hydroxyl-containing alkyl ester of (meth)acrylic acid, (c) from 1 to 25% by weight of at least one monomer having at least two polymerizable, olefinically unsaturated double bonds, (d) from 0 to 25% by weight of at least one further hydroxyl-containing monomer, (e) from 5 to 80% by weight of at least one aliphatic ester of (meth)acrylic acid, (f) from 0 to 40% by weight of at least one vinyl-aromatic compound, and (g) from 0 to 40% by weight of at least one further monomer, the sum of the proportions by weight of all monomers (a) to (g) always being 100% by weight. The invention additionally embraces a process for producing a multicoat paint system using the novel coating composition and the use of the novel coating composition as topcoat, especially in automotive refinishing.