Patent ID: 8609762

Claim:
A coating composition comprising: water; a polymer comprising one or more acetoacetyl-functional groups; an acid-functional polymer, which may be the same as or distinct from the polymer comprising acetoacetyl-functional groups, wherein a nitrogen-free base has been used to neutralize or partially neutralize the acid-functionality of the polymer; an ethylenically unsaturated compound distinct from the acetoacetyl-functional polymer; wherein the ethylenically unsaturated compound is a monomer, oligomer, or mixture thereof; and a hydrogen abstraction initiator in an amount of at least 0.1 wt-%, based on the total weight of the coating composition; wherein the hydrogen abstraction initiator is selected to polymerize the acetoacetyl-functional polymer via a free radical UV cure mechanism through hydrogen abstraction of —C(O)—CH 2 —C(O)— hydrogens.