Waterborne hydrophobic barrier coatings
AssigneeWacker ChemicalCorporation
InventorJohn Richard Boylan
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Abstract
A waterborne hydrophobic barrier coating formulation comprising a blend of a vinyl acetate-ethylene (VAE) polymer emulsion and a paraffin wax emulsion, wherein a dried coating of the blend on a substrate, such as a nonwoven web, an absorbent pad, or a textile, and dried, has a hydrostatic head barrier sufficient to prevent passage of fluids but allow passage of water vapor through it. A multi-layer material comprising at least one layer of a nonwoven web, an absorbent pad, or a textile, and at least one layer of a blend of a VAE polymer emulsion and paraffin wax emulsion.
Claims7
A blend comprising a poly(vinyl alcohol) stabilized vinyl acetate-ethylene polymer emulsion and a paraffin wax emulsion, wherein a dried coating of said blend on a substrate has a hydrostatic head barrier sufficient to prevent passage of fluids but allow passage of water vapor through it, the vinyl acetate-ethylene polymer emulsion comprises a polymer containing 70 to 95 wt % vinyl acetate and 5 to 30 wt % ethylene, based on the total weight of monomers in the polymer, and the paraffin wax in the paraffin wax emulsion has an average particle size of at least 0.3 microns.
Dependencies are inferred from the claim text.