Patent ID: 7091278

Claim:
Aqueous coating compositions comprising A) at least one water-dilutable (meth)acrylate copolymer with a hydroxyl value of 220 to 280 mg KOH/g and B) at least one polyisocyanate cross-linking agent with free isocyanate groups, wherein the (meth)acrylate copolymers being a mass polymerization reaction product of a) 15–35% by weight of at least one glycidyl ester derived from an aliphatic saturated monocarboxylic acid branched in alpha position, b) 10–40% by weight of at least one polyalkylene glycol(meth)acrylate, c) 30–45% by weight of at least one hydroxy-functional olefinic unsaturated monomer different from component b), d) 7–20% by weight of at least one olefinic unsaturated monocarboxylic acid, e) 0–40% by weight of at least one vinyl aromatic monomer and f) 0–40% by weight of other olefinic unsaturated monomers different from monomers a) to e), wherein component d) is used in molar excess of component a) and the % by weight of components a) to f) adding up to 100%, and wherein the aqueous coating compositions comprise maximally 10% by weight of organic solvents.