Patent ID: 6620884
Filing Date: 2003-09-16
Classification: C09D

Abstract:
A process for assessing whether a coating composition can provide a scratch-resistant coating comprisingI. measuring, by dynamic mechanical thermoanalysis on a homogeneous free film having a film thickness of 40Â±10 &mgr;m, a storage modulus Eâ€² and a loss factor tan &dgr; of the coating c position, after the coating composition has been cured, and II. labeling the coating composition as providing a scratch-resistant coating when the storage modulus in a rubber-elastic range is at least 107.5 Pa and the loss factor tan &dgr; at 20Â° C. is at least 0.05; wherein the coating composition comprisesA. at least one binder comprising at least one polyacrylate resin having a hydroxyl number of from 100 to 240, an acid number of from 0 to 35 and a number-average molecular weight of from 1500 to 10,000, and B. at least one crosslinker comprising at least one of a free isocyanate, a blocked isocyanate, and a triazine-based component wherein the triazine-based component crosslinks with hydroxyl groups of the binder to form at least one of an ether and an ester structure.