Effect of acid groups in hydroxyl functional resins on the properties of polyester-urethane powder coatings

The concept of using hyperbranched polymers as scaffolds for solid thermoset resin applications is de-scribed. A series of semi-crystalline methacrylae-functional aliphaic poly-esters has been synthesized and characterized for applications as solid thermoset resins, e.g., powder coating resins. The polyester resin have been croslinked by UV irradiation producing either amorphous or semi-crystalline crosslinked films depending on the initial structure. The esins are based on hyperbranced aliphatic polyesters onto which crystaline linear aliphatic polyester chains have been grafted and end-capped with methacrylate moieties. The resins exhibit a rheological behavior suitable for low temperature curing powder coaings, i.e., films that can be readily formed and UV cured a temperatures below 80 °C. 2000 Lake Park Drive Smyrna GA 30080 E-Mails: bin.wu@ucb-group.com and sanilay.padaki@ucb-group.com