Two-component polyurethane composition

A process of preparing a two-component polyurethane composition, comprising:

• (i) providing an aqueous dispersion comprising an emulsion polymer with a weight average molecular weight of 70,000 g/mol or less and a surfactant selected from the group consisting of a sulphate surfactant, a sulfonate surfactant containing no carboxyl or carboxylate group, or mixtures thereof;
• wherein the emulsion polymer prepared by emulsion polymerization in the presence of a chain transfer agent comprises, by weight based on the weight of the emulsion polymer,
• greater than 0.25% of structural units of a phosphorous-containing acid monomer and/or a salt thereof, greater than 15% of structural units of a hydroxy-functional alkyl (meth)acrylate, structural units of a monoethylenically unsaturated nonionic monomer, and from zero to 10% of structural units of an additional acid monomer and/or a salt thereof;
• and
• (ii) mixing the aqueous dispersion from step (i) with a water-dispersible polyisocyanate.