Aqueous coating composition having improved acid etch and mar resistance

摘要

Disclosed herein is an aqueous coating composition having a pH of 6.0-10.0 comprises 30 % to 70 % by weight of film-forming binder and correspondingly 70 % to 30 % by weight of an aqueous liquid carrier for the binder; wherein the binder comprises: a. 20 % to 95 % by weight, based on the weight of the binder, of a urethane oligomer having a weight average molecular weight of 300 to 2500 and having acid functionality and neutralized with an amine and to form a water-dispersible product; and b. 5 % to 80 % by weight, based on the weight of the binder, of a water-compatible alkylated melamine formaldehyde crosslinking agent. This aqueous coating composition provides a protective clear top coat finish that not only has good gloss and distinctness of image that provides an excellent appearance but that also has a high level of acid etch resistance and excellent mar resistance.