“…Today, PUDs are used in a wide variety of applications, including insulating materials, adhesives, elastomers and perhaps most notably coatings. What highlights them among alternative waterborne polymer dispersions is their superior physical properties such as toughness and flexibility. − However, although PUDs have successfully been developed into practical systems, their high raw material costs and low water and alkali resistance are a drawback for some applications. ,, Therefore, to optimize the cost/performance ratio, PUDs are often used in hybrid dispersed systems with polyesters, alkyds and acrylics, , of which the combination of PU/acrylic is the most common. − In these hybrid dispersions, the acrylic component provides the outdoor and alkali resistance, as well as good pigment compatibility and low cost, while the PU enhances the toughness, flexibility and film forming performance. ,, In order to ensure that such hybrid materials offer a true synergy between the PU and acrylic components, control of the polymer microstructure is of great importance …”