Waterborne, UV curable coating composition for easy-clean coatings

An aqueous dispersion of a carboxyl-functional, unsaturated polyester containing a perfluoropolyether block prepared by the following steps:

• a) subjecting a carboxyl-terminated perfluoropolyether C to a reaction with an ethylenically unsaturated epoxy-functional compound D in the presence of compound E, wherein compound E is a carboxylic acid or anhydride with functionality of at least 2, to obtain carboxyl-functional, unsaturated polyester F,
• b) neutralizing carboxyl-functional, unsaturated polyester F with a neutralizer G and dispersing it in water,
• wherein the carboxyl-terminated perfluoropolyether C is prepared by subjecting a hydroxy-terminated perfluoropolyether A to a condensation reaction with compound B, wherein compound B is a multifunctional carboxylic acid or anhydride with a functionality of at least 3.