Patent ID: 7205356

Claim:
A two-component polyurethane coating system comprising (a) a polyisocyanate which is optionally hydrophilically modified, (b) a compound which I) has groups which are reactive with isocyanates, Ii) is optionally hydrophilically modified, and Iii) is dissolved or dispersed in water, optionally in the presence of an organic solvent or solvent mixture, (c) one or more compounds of an element of group v or group vi of the periodic table, in which the element in each case has an oxidation state of at least +4, and (d) optionally an additive or an auxiliary agent, Wherein the quantities of (a)+(b) are from 20 to 99.9999 parts by weight, the quantity of (c) is from 0.0001 to 5 parts by weight, and the quantity of (d) is from 0 to 75 parts by weight, with the proviso that the sum of the parts by weight (a) to (d) is 100.