Aqueous copolymers, a process for their preparation and their use in coating compositions

摘要

The present invention relates to a hydroxy-functional copolymer P, which is present as a dispersion and/or solution in water, and is obtained by successively carrying out process steps A-D:A) initially introducing a hydrophobic polymer containing hydroxyl groups into a reaction vessel,B) introducing an initiator component into that vessel,C) subsequently polymerizing a hydrophobic monomer mixture containing hydroxyl groups in that vessel andD) subsequently polymerizing a hydrophilic monomer mixture containing hydroxyl and acid groups in that vessel.The present invention also relates to a process for the preparation of copolymers P following the procedure previously set forth and to coating compositions containing these copolymers P and one or more crosslinking agents.