| abstract |
The invention provides an elastic barrier coating composition comprising an aqueous dispersion of core-shell particles and an elastic polymer different from the aqueous dispersed core-shell particles. The aqueous dispersion of core-shell particles includes an aqueous medium and core-shell particles dispersed in the aqueous medium. The core-shell particles have a polymer core that is at least partially encapsulated by a polymer shell, wherein the polymer shell includes: (i) a barrier segment comprising an aryl and urethane bond, a urea bond, or Combination; and (ii) an elastic segment different from (i). The barrier segment includes at least 30% by weight of the polymer shell based on the total solid weight of the polymer shell. In addition, the polymer shell is covalently bonded to at least a portion of the polymer core. |