Solvent-free, two-component, polyurethane reactive compositions and coatings produced therefrom that have good elongation and withstand cathodic protection

A solvent-free, two-component polyurethane coating composition that is suitable for the production of coatings that have long term resistance to temperatures of up to 30° C., have good elongation and withstand cathodic protection, which comprises

• A) a solvent-free polymer mixture comprising
• I) 5 to 50 wt. % of a component free from OH groups and comprising
• a) 0 to 100 wt. % of a chlorinated paraffin or dibutoxybenzene,
• b) 0 to 100 wt. % of a di-[phenoxy-alkyl]formal,
• c) 0 to 100 wt. % of a polyacrylonitrile,
• wherein the percentages of I-a), I-b) and I-c) add up to 100 wt. %, based on the weights of I-a) to I-c), and
• II) 50 to 95 wt. % of a component having hydroxyl groups comprising
• a) 40 to 100 wt. % of a component which contains hydroxy groups and ether groups, has a functionality of ≧3.5 and a number average molecular weight of 280 to 1000, and is different from b),
• b) 0 to 60 wt. % of a hydroxy-functional polyether polyacrylate and
• c) 0 to 60 wt. % of a hydroxy-functional compound other than a) and b),
• wherein the wt. % of 11-a) to 11-c) add up to 100 wt. %, based on the weight of component 11) and
• B) a polyisocyanate component comprising at least one organic polyisocyanate,
• wherein the NCO:OH equivalent ratio is 0.8:1 to 1.5:1.