| abstract |
(57) Abstract: (Corrected) PROBLEM TO BE SOLVED: To provide an improved two-component paint system comprising a crosslinkable hydroxy group-containing polymer and a polyisocyanate crosslinking agent. A two-component coating composition forms a carboxy-containing, water-dispersible, isocyanate-terminated polyurethane prepolymer and at least one acrylic monomer containing hydroxy groups is added to form a prepolymer / monomer mixture. Add alkanolamine to polymer / monomer mixture, introduce hydroxy functional groups into polyurethane prepolymer, disperse prepolymer / monomer mixture in water, add oil-soluble free radical initiator and hydroxy containing chain extender, It is prepared by polymerizing the monomers, heating the aqueous dispersion to complete chain extension of the prepolymer, and mixing the resulting hybrid dispersion with a water-dispersible polyisocyanate. |