Patent ID: 8063119

Claim:
A barrier coating derived from a stable aqueous dispersion where said dispersion is in the form of an emulsion, suspension, colloidal dispersion and/or latex, said dispersion including (i) a dispersed non-elastomeric polymer selected from the group consisting of polyvinylidene chlorides, polyesters, polyacrylics and polyurethanes, (ii) a dispersed substantially exfoliated silicate filler material not functionalized with organic cations, the silicate filler having an aspect ratio greater than 25 wherein said substantially exfoliated silicate filler is treated with acid or base prior to being combined with the non-elastomeric polymer, and wherein % of the silicate filler is less than 60% of the solid content based on weight, and (iii) at least one additive, selected from the group consisting of surfactants, emulsifiers, anti-foaming agents, dispersing agents, wetting agents, leveling agents and thickeners wherein the coating exhibits an at least 5-fold reduction in gas permeability than a coating formed of said non-elastomeric polymer alone.