Patent ID: 7119138

Claim:
A barrier coating derived from an aqueous dispersion of an elastomeric polymer composition, said polymer composition comprising pre-vulcanized elastomer, a substantially exfoliated acid or base modified or treated silicate filler material not functionalized with organic cations, the silicate having an aspect ratio greater than 25 and the silicate is present at less than 60% of the total solids content, and 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 200-fold reduction in gas permeability as compared with a coating formed of said elastomeric polymer composition alone and said coating retains its barrier properties under strain such that the coating has a strain to first damage of at least 10% biaxial elongation at 0% RH.