TISSUE-BASED WATER BARRIER MATERIAL
A hydrophobic, liquid-impermeable substrate includes a hydrophilic nonwoven having a treated surface, a polyolefin dispersion disposed on the treated surface, and a hydrophobic chemistry disposed on the polyolefin dispersion. A method for preparing a hydrophobic, breathable, liquid-impermeable substrate includes providing a hydrophilic nonwoven having a treated surface, applying a polyolefin dispersion to the treated surface, and applying a hydrophobic chemistry to the polyolefin dispersion. The hydrophilic nonwoven can be tissue or paper toweling. The hydrophobic chemistry can be a water-dispersible hydrophobic polymer.
1 . A hydrophobic, liquid-impermeable substrate comprising:
a hydrophilic nonwoven having a treated surface; a polyolefin dispersion disposed on the treated surface; and a hydrophobic chemistry disposed on the polyolefin dispersion.
2 . The substrate of claim 1 , wherein the hydrophilic nonwoven includes tissue or paper toweling.
3 . The substrate of claim 1 , wherein the hydrophilic nonwoven includes cellulose.
4 . The substrate of claim 1 , wherein the hydrophilic nonwoven includes fibers.
5 . The substrate of claim 1 , wherein the substrate is breathable and exhibits an air permeability of 100 cfm.
6 . The substrate of claim 1 , wherein the hydrophilic nonwoven includes a hydrophilic surface opposite the treated surface.
7 . The substrate of claim 1 , wherein the hydrophobic chemistry is a water-dispersible hydrophobic polymer.
8 . The substrate of claim 1 , wherein the water-dispersible hydrophobic polymer includes a comonomer selected from acrylic monomers, acrylic precursors, and the like.
9 . The substrate of claim 1 , wherein the hydrophobic chemistry is a superhydrophobic chemistry.
10 . The substrate of claim 9 , wherein the superhydrophobic chemistry includes a hydrophobic component selected from the group consisting of fluorinated polymers, perfluorinated polymers, and mixtures thereof.
11 . The substrate of claim 9 , wherein the superhydrophobic chemistry includes one of UNIDYNE KCO3 fluorinated water and oil repellent or the Formulation III chemistry.
12 . The substrate of claim 1 , wherein the polyolefin dispersion is HYPOD 8510.
13 . The substrate of claim 1 , further comprising nanoclay.
14 . The substrate of claim 1 , the further comprising a surfactant, wherein the surfactant is selected from nonionic, cationic, and anionic surfactants.
15 . The substrate of claim 1 , further comprising a stabilizing agent selected from the group consisting of long chain fatty acids, long chain fatty acid salts, ethylene-acrylic acid, ethylene-methacrylic acid copolymers, sulfonic acid, acetic acid, and the like.
16 . The substrate of claim 1 , further comprising a filler selected from the group consisting of milled glass, calcium carbonate, aluminum trihydrate, talc, antimony trioxide, fly ash, clays, and the like.
17 . A method for preparing a hydrophobic, breathable, liquid-impermeable substrate comprising:
providing a hydrophilic nonwoven having a treated surface;
applying a polyolefin dispersion to the treated surface; and
applying a hydrophobic chemistry to the polyolefin dispersion.
18 . The method of claim 17 , wherein the hydrophilic nonwoven includes tissue or paper toweling.
19 . The method of claim 17 , wherein the hydrophobic chemistry is a water-dispersible hydrophobic polymer.
20 . The method of claim 17 , wherein the hydrophobic chemistry is a superhydrophobic chemistry.