Process for manufacturing an aqueous polyurethane acrylate hybrid polymer dispersion, comprising: forming an NCO-terminated, vinyl-functionalized polyurethane prepolymer from a reaction mixture comprising: (a) at least one polyol with a number average molecular weight M n in the range of 400 to 10000 g/mol, preferably 500 g/mol to 4000 g/mol, more preferably 1000 g/mol to 3000 g/mol; (b) at least one vinyl-functionalized polyol, preferably an allyl-functionalized polyol, wherein the at least one vinyl-functionalized polyol comprises at least two hydroxyl groups and at least one vinyl group; (c) at least one halogenated polyether polyol; (d) at least one anionic stabilizer, wherein the at least one anionic stabilizer comprises at least two hydroxyl groups and at least one negatively charged functional group, preferably a carboxyl or sulfonic acid group; (e) at least one polyisocyanate, preferably at least one aliphatic di- and/or triisocyanate, wherein the at least one polyisocyanate is used in molar excess relative to the hydroxy groups of the other components of the reaction mixture to obtain an NCO-terminated, vinyl-functionalized polyurethane prepolymer; dissolving the prepolymer obtained in step in at least one acrylic monomer to obtain a prepolymer/acrylic monomer mixture, wherein the amount of the prepolymer and the at least one acrylic monomer is selected such that the weight proportion of polyurethane/acrylic in the hybrid polymer is 10:90 to 50:50, preferably 20:80 to 40:60; dispersing the prepolymer/acrylic monomer mixture into a continuous aqueous phase under application of shear forces, preferably by mechanical stirring, to obtain an emulsion; reacting the prepolymer with at least one chain extension agent; and polymerizing the vinyl groups of the prepolymer and the at least one acrylic monomer to obtain the polyurethane acrylate hybrid polymer dispersion. forming an NCO-terminated, vinyl-functionalized polyurethane prepolymer from a reaction mixture comprising: (a) at least one polyol with a number average molecular weight M n in the range of 400 to 10000 g/mol, preferably 500 g/mol to 4000 g/mol, more preferably 1000 g/mol to 3000 g/mol; (b) at least one vinyl-functionalized polyol, preferably an allyl-functionalized polyol, wherein the at least one vinyl-functionalized polyol comprises at least two hydroxyl groups and at least one vinyl group; (c) at least one halogenated polyether polyol; (d) at least one anionic stabilizer, wherein the at least one anionic stabilizer comprises at least two hydroxyl groups and at least one negatively charged functional group, preferably a carboxyl or sulfonic acid group; (e) at least one polyisocyanate, preferably at least one aliphatic di- and/or triisocyanate, wherein the at least one polyisocyanate is used in molar excess relative to the hydroxy groups of the other components of the reaction mixture to obtain an NCO-terminated, vinyl-functionalized polyurethane prepolymer; (a) at least one polyol with a number average molecular weight M n in the range of 400 to 10000 g/mol, preferably 500 g/mol to 4000 g/mol, more preferably 1000 g/mol to 3000 g/mol; (b) at least one vinyl-functionalized polyol, preferably an allyl-functionalized polyol, wherein the at least one vinyl-functionalized polyol comprises at least two hydroxyl groups and at least one vinyl group; (c) at least one halogenated polyether polyol; (d) at least one anionic stabilizer, wherein the at least one anionic stabilizer comprises at least two hydroxyl groups and at least one negatively charged functional group, preferably a carboxyl or sulfonic acid group; (e) at least one polyisocyanate, preferably at least one aliphatic di- and/or triisocyanate, wherein the at least one polyisocyanate is used in molar excess relative to the hydroxy groups of the other components of the reaction mixture to obtain an NCO-terminated, vinyl-functionalized polyurethane prepolymer; dissolving the prepolymer obtained in step in at least one acrylic monomer to obtain a prepolymer/acrylic monomer mixture, wherein the amount of the prepolymer and the at least one acrylic monomer is selected such that the weight proportion of polyurethane/acrylic in the hybrid polymer is 10:90 to 50:50, preferably 20:80 to 40:60; dispersing the prepolymer/acrylic monomer mixture into a continuous aqueous phase under application of shear forces, preferably by mechanical stirring, to obtain an emulsion; reacting the prepolymer with at least one chain extension agent; and polymerizing the vinyl groups of the prepolymer and the at least one acrylic monomer to obtain the polyurethane acrylate hybrid polymer dispersion.