US2003219613A1PendingUtilityA1
Waterborne hydrophobic barrier coatings
Assignee: AIR PRODUCTS POLYMERS L P A LTPriority: May 24, 2002Filed: May 9, 2003Published: Nov 27, 2003
Est. expiryMay 24, 2022(expired)· nominal 20-yr term from priority
Inventors:John Richard Boylan
Y10T428/31938C09D 129/04Y10T442/2221Y10T442/2254C09D 191/08C08L 91/08D06N 7/00D06N 3/04C08L 31/04
40
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Claims
Abstract
A waterborne hydrophobic barrier coating formulation comprising a blend of a poly(vinyl acetate) emulsion and a paraffin wax emulsion or a vinyl acetate-ethylene (VAE) polymer emulsion and a paraffin wax emulsion which, when applied to 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 poly(vinyl acetate) emulsion and a paraffin wax emulsion or a VAE polymer emulsion and paraffin wax emulsion. The emulsion blend, after drying, has a hydrostatic head barrier sufficient to prevent passage of fluids through it but allow passage of water vapor.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1 . A blend comprising a poly(vinyl acetate) emulsion and a paraffin wax emulsion or a vinyl acetate-ethylene polymer emulsion and a paraffin wax emulsion, said blend, when applied as a coating to a substrate and dried, has a hydrostatic head barrier sufficient to prevent passage of fluids but allow passage of water vapor through it; said substrate selected from the group consisting of a nonwoven web, an absorbent pad, a nonwoven textile, and a textile fabric.
2 . The blend of claim 1 wherein the hydrostatic head barrier is at least 30 mm.
3 . The blend of claim 1 wherein the hydrostatic head barrier is at least 60 mm.
4 . The blend of claim 1 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.
5 . The blend of claim 1 wherein the vinyl acetate-ethylene polymer emulsion comprises a polymer containing 70 to 95 wt % vinyl acetate, 5 to 30 wt % ethylene, and up to 10 wt % of one or more other ethylenically unsaturated monomer, based on the total weight of monomers in the polymer.
6 . The blend of claim 1 wherein the vinyl acetate-ethylene polymer emulsion is a poly(vinyl alcohol)-stabilized polymer emulsion.
7 . The blend of claim 1 wherein the vinyl acetate-ethylene polymer has a T g of −15 to 30° C.
8 . The blend of claim 1 wherein the poly(vinyl acetate) emulsion or the vinyl acetate-ethylene polymer emulsion has little or no formaldehyde and is free of alkylphenol ethoxylate surfactants.
9 . The blend of claim 1 wherein the paraffin wax emulsion further comprises polyethylene or ethylene acrylic acid.
10 . The blend of claim 1 comprising, on a 100% dry weight solids basis:
10-90%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
10-90%
paraffin wax emulsion
0-80%
water soluble polymer or a protective colloid
0-5%
fluoro surfactant
0-10%
pigment
11 . The blend of claim 1 comprising, on a 100% dry weight solids basis:
20-80%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
20-80%
paraffin wax emulsion
0-10%
water soluble polymer or a protective colloid
0-3%
fluoro surfactant
0-5%
pigment
12 . The blend of claim 1 comprising, on a 100% dry weight solids basis:
40-60%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
40-60%
paraffin wax emulsion
0-5%
water soluble polymer or a protective colloid
0-2%
fluoro surfactant
0-3%
pigment
13 . 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 acetate) emulsion and a paraffin wax emulsion, or a blend of a 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.
14 . The multi-layer material of claim 13 wherein the hydrostatic head barrier is at least 30 mm.
15 . The multi-layer material of claim 13 wherein the material is an absorbent pad.
16 . The multi-layer material of claim 13 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.
17 . The multi-layer material of claim 13 wherein the vinyl acetate-ethylene polymer emulsion comprises a polymer containing 70 to 95 wt % vinyl acetate, 5 to 30 wt % ethylene, and up to 10 wt % of one or more other ethylenically unsaturated monomer, based on the total weight of monomers in the polymer.
18 . The multi-layer material of claim 13 wherein the vinyl acetate-ethylene polymer emulsion is a poly(vinyl alcohol)-stabilized polymer emulsion.
19 . The multi-layer material of claim 13 wherein the vinyl acetate-ethylene polymer has a T g of −15 to 30° C.
20 . The multi-layer material of claim 13 wherein the poly(vinyl acetate) emulsion or the vinyl acetate-ethylene polymer emulsion has little or no formaldehyde and is free of alkylphenol ethoxylate surfactants.
21 . The multi-layer material of claim 13 , wherein the blend comprises, on a 100% dry weight solids basis:
10-90%
poly(vinyl acetate)emulsion or vinyl acetate-ethylene
polymer emulsion
10-90%
paraffin wax emulsion
0-80%
water soluble polymer or a protective colloid
0-5%
fluoro surfactant
0-10%
pigment
22 . The multi-layer material of claim 13 comprising, on a 100% dry weight solids basis:
20-80%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
20-80%
paraffin wax emulsion
0-10%
water soluble polymer or a protective colloid
0-3%
fluoro surfactant
0-5%
pigment
23 . The multi-layer material of claim 13 comprising, on a 100% dry weight solids basis:
40-80%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
40-60%
paraffin wax emulsion
0-5%
water soluble polymer or a protective colloid
0-2%
fluoro surfactant
0-3%
pigment
24 . The multi-layer material of claim 13 wherein the paraffin wax emulsion further comprises polyethylene or ethylene acrylic acid.
25 . 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 poly(vinyl acetate) emulsion and a paraffin wax emulsion, or a blend of a vinyl acetate-ethylene polymer emulsion and a paraffin wax emulsion; (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.
26 . The method of claim 25 wherein the hydrostatic head barrier is at least 30 mm.
27 . The method of claim 25 wherein the material is an absorbent pad.
28 . The method of claim 25 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.
29 . The method of claim 25 wherein the vinyl acetate-ethylene polymer emulsion comprises a polymer containing 70 to 95 wt % vinyl acetate, 5 to 30 wt % ethylene, and up to 10 wt % of one or more other ethylenically unsaturated monomer, based on the total weight of monomers in the polymer.
30 . The method of claim 25 wherein the vinyl acetate-ethylene polymer emulsion is a poly(vinyl alcohol)-stabilized polymer emulsion.
31 . The method of claim 25 wherein the vinyl acetate-ethylene polymer has a T g of −15 to 30° C.
32 . The method of claim 25 wherein the poly(vinyl acetate) emulsion or the vinyl acetate-ethylene polymer emulsion has little or no formaldehyde and is free of alkylphenol ethoxylate surfactants.
33 . The method of claim 25 wherein the blend comprises, on a 100% dry weight solids basis:
10-90%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
10-90%
paraffin wax emulsion
0-80%
water soluble polymer or a protective colloid
0-5%
fluoro surfactant
0-10%
pigment
34 . The method of claim 25 comprising, on a 100% dry weight solids basis:
20-80%
poly(vinyl acetate)emulsion or vinyl acetate-ethylene
polymer emulsion
20-80%
paraffin wax emulsion
0-10%
water soluble polymer or a protective colloid
0-3%
fluoro surfactant
0-5%
pigment
35 . The method of claim 25 comprising, on a 100% dry weight solids basis:
40-60%
poly(vinyl acetate) emulsion or vinyl acetate-ethylene
polymer emulsion
40-60%
paraffin wax emulsion
0-5%
water soluble polymer or a protective colloid
0-2%
fluoro surfactant
0-3%
pigment
36 . The method of claim 25 wherein the paraffin wax emulsion further comprises polyethylene or ethylene acrylic acid.Join the waitlist — get patent alerts
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