Coating composition based on a hydroxyl-containing polyacrylate resin and its use in processes for the production of a multilayer coating

PCT No. PCT/EP96/02153 Sec. 371 Date Feb. 4, 1998 Sec. 102(e) Date Feb. 4, 1998 PCT Filed May 25, 1996 PCT Pub. No. WO96/38490 PCT Pub. Date Dec. 5, 1996The present invention relates to a coating composition comprising (A) at least one hydroxyl-containing polyacrylate resin, (B) at least one isocyanate crosslinking agent and, if desired, (C) at least one hydroxyl-containing polyester-modified polyacrylate resin, wherein the polyacrylate resin (A) is obtainable by polymerizing (a1) at least one essentially carboxyl-free (meth)acrylic ester, (a2) at least one copolymerizable, hydroxyl-containing monomer which is different from (a3) (a3) at least one reaction product of acrylic acid and/or methacrylic acid with the glycidyl ester of an alpha -branched monocarboxylic acid having 5 to 18 carbon atoms per molecule, (a4) if desired, an [sic] at least one carboxyl-containing monomer, (a5) at least one polysiloxane macromonomer having a number-average molecular weight of from 1000 to 40,000 and on average from 0.5 to 2.5 ethylenically unsaturated double bonds per molecule or having on average from 0.5 to 2.5 epoxide groups per molecule, (a6) at least one aromatic vinyl compound, and (a7) if desired, at least one additional, essentially carboxyl-free monomer, the nature and quantity of the monomers being selected such that the polyacrylate resin (A) has the desired OH number and acid number, and the quantity of (a5) being less than 5% by weight.