| abstract |
The invention relates to a crosslinkable polymer binder comprising a polyurethane macromer and grafted thereon a vinyl polymer, the macromer being prepared by reacting: I a monomer (I) comprising 2 or more hydroxy functional groups, II a monomer (II), comprising 2 or more isocyanate functional groups, III a stabilizing monomer (III) comprising ionically and/or non-ionically stabilising groups, IV a graft monomer (IV) having only one group reactive with monomer I or Il and one vinyl group, V a chain stopper monomer (V) having only one group reactive with monomer I or II, wherein at least 30 mole %, of the macromers have only one graft monomer IV and less than 50 mole % of the macromers have two or more graft monomers IV, wherein the vinyl polymer is linked to the vinyl group of graft monomer IV and wherein the vinyl polymer and/or the macromer comprise crosslinkable groups. The invention further relates to an aqueous dispersion comprising said crosslinkable polymer binder and to a process for the manufacture of said crosslinkable polymer binder and said aqueous dispersion thereof. The crosslinkable polymer binder can be used in coating compositions or adhesives. |