Patent ID: 7078453

Claim:
A barrier coating derived from an aqueous dispersion of a non-butyl elastomeric polymer, 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, wherein % of the silicate is less than 60% of the total solid 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 5-fold reduction in gas permeability than a coating formed of said non-butyl elastomeric polymer alone and said coating retains its barrier properties under strain and the acid or base modified or treated silicate filler is effective to increase the strain resistance of the coating as compared with a like coating with unmodified or untreated filler such that the coating has a strain to first damage of at least 5% biaxial elongation at 0% RH.