Waterborne hydrophobic barrier coatings
AssigneeWacker ChemicalCorporation
InventorJohn 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.
Claims20
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, and 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.
A multi-layer material comprising
- (a) at least one layer of a material selected from the group consisting of a nonwoven web, an absorbent pad, a nonwoven textile, and a textile fabric;
- and
- (b) at least one layer of a coating formulation comprising a blend of a poly(vinyl alcohol)-stabilized vinyl acetate-ethylene polymer emulsion and a paraffin wax emulsion;
- said coating formulation, after drying, having a hydrostatic head barrier sufficient to prevent passage of fluids through it, but allow passage of water vapor wherein 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.
A method for making a multi-layer material comprising:
- (a) providing at least one layer of a material selected from the group consisting of a nonwoven web, an absorbent pad, a nonwoven textile, and a textile fabric;
- and
- (b) providing at least one layer of a coating formulation comprising a blend of a blend of a poly(vinyl alcohol) stabilized vinyl acetate-ethylene polymer emulsion and a paraffin wax emulsion, wherein 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;
- (c) applying said coating formulation to said material;
- and
- (d) drying said coating formulation;
- said dried coating formulation having a hydrostatic head barrier sufficient to prevent passage of fluids through it, but allow passage of water vapor.
Dependencies are inferred from the claim text.