Patent ID: 8383715

Claim:
An aqueous primer dispersion for use in coating a fluorocarbon substrate to increase the adhesive strength between the fluorocarbon substrate and a subsequently applied water-derived protective coating, the aqueous primer dispersion consisting essentially of (1) about 0.5-10 wt. % of at least one aqueous acrylic polymer source dispersion containing acrylic polymer particles, (2) about 25-400 wt. % based on the weight of all polymer particles in the aqueous primer dispersion of an organic solvent capable of softening the acrylic polymer particles, and (3) a mineral thickener, wherein the weight ratio of mineral thickener to all of the polymer particles in the aqueous primer dispersion is between about 1:1 to 7.5:1, wherein the total amount of aqueous dispersions used to make the aqueous primer dispersion is about 10 wt. % or less, and further wherein the total amount of all polymer particles in the aqueous primer dispersion which are surfactant-stabilized, if any, is no more than 8 wt. %, and further wherein essentially all of the polymer particles in the aqueous primer dispersion are formed from an acrylic polymer.