| abstract |
An aqueous coating composition is provided, the aqueous coating composition comprising: (a) a polymer comprising from 2% to 8% by weight, based on the weight of the polymer, of structural units of an α,β-ethylenically unsaturated carboxylic acid monomer, and 0.05% by weight % to 1.8% by weight of structural units of an ethylenically unsaturated silane functional monomer; (b) an aqueous solution of a zinc-ammonia complex salt; and (c) 60% to 90% by weight of a filler, based on the total weight of the aqueous coating composition, wherein the weight ratio of zinc ions to polymer ranges from 0.7% to 6%. The aqueous coating composition has a long pot life and good adhesion to the substrate. Also provided are methods of making the coating composition. |