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1. (WO2019006247) MATÉRIAUX DE CONSTRUCTION À RETARDEMENT DE VAPEUR ET PROCÉDÉS POUR LEUR FABRICATION
Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

We claim:

1. A vapor retarding article, comprising

a building material substrate; and

a polymeric coating layer coated on the building material substrate, the polymeric coating layer being different from the building material substrate, the polymeric coating layer comprising an inorganic hydrophilic particulate filler dispersed in a continuous organic phase comprising a hydrophobic polymer, wherein the content of the filler is from about 30% to about 85% by weight of the polymeric coating layer;

wherein the vapor retarding article is configured to have a water vapor permeance of no more than about 1 Perm (e.g., from about 0.1 Perm to about 1 Perm) at 25% relative humidity, as tested by AST E98 at 23 °C.

2. The method of claim 1 , wherein the vapor retarding article is configured to have a water vapor permeability of at least about 5 Perms (e.g., at least about 8 Perms, or at least about 12 Perms, or at least about 15 Perms, or at least about 20 Perms) at 95% relative humidity as tested by ASTM E98 at 23 °C.

3. The vapor retarding article of claim 1 or claim 2, wherein the building material substrate is a building material substrate sheet, and wherein the vapor retarding article is in the form of a vapor retarding membrane.

4. The vapor retarding article of claim 3, wherein the building material substrate sheet is paper, such as kraft paper, a scrim, a non-woven fabric, such as a polypropylene non-woven fabric, a nylon non-woven fabric, a polyester non-woven fabric (e.g., a poly(ethylene terephthalate) non-woven fabric), a polystyrene non-woven fabric, an

acrylonitrile/butadiene/styrene copolymer non-woven fabric, or a polyethylene non-woven fabric, or a perforated thermoplastic film, e.g., a perforated polypropylene film, a perforated nylon film, a perforated polystyrene film, a perforated acryionitriie/butadiene/styrene copolymer film, a perforated polyester film such as a perforated poly(ethylene terephthalate) film, or a perforated polyethylene film.

5. The vapor retarding article of any of claims 1 -4, wherein the hydrophobic polymer is a styrene butadiene copolymer (e.g., a styrene butadiene rubber), an acrylic polymer or copolymer such as a styrene acrylic polymer, a vinyl acetate/ethylene copolymer, a

polyvinyl buiyral), a poly(vinylidene chloride) polymer or copolymer, or a polyolefin (such as polyethylene, polypropylene, or polybutadiene), or a combination thereof.

6. The vapor retarding article of any of claims 1 -5, wherein the hydrophobic polymer is coated onto the substrate from an aqueous dispersion of the hydrophobic polymer dispersed in water, such as a polymer latex, or from an aqueous emulsion of the hydrophobic polymer.

7. The vapor retarding article of any of claims 1 -6, wherein the hydrophobic polymer is present in the continuous organic phase of the polymeric coating layer in an amount of at least about 70 wt%, or at least about 85 wt%, based on the total weight of the continuous organic phase of the polymeric coating layer.

8. The vapor retarding article of any of claims 1 -7, wherein the particulate filler has a median particle size (i.e., d50, 50th percentile particle size) of about 2 to about 10 μπι.

9. The vapor retarding article of any of claims 1 -8, wherein the particulate filler is alumina trihydrate, kaolin, or a mixture thereof.

10. The vapor retarding article of any of claims 1-8, wherein the particulate filler is alumina trihydrate.

1 1 . The vapor retarding article of any of claims 1-1 Q, wherein the particulate filler is present in the polymeric coating layer in an amount of at least 54 wt%, or comprised in the range of 54 wt% to about 85 wt%, or 54 wt% to about 80 wt%, or 54 wt% to about 75 wt%, or 54 wt% to about 70 wt%, based on the total dry weight of the polymeric coating layer.

12. The vapor retarding article of any of claims 1- , wherein the combined content of the particulate filler and the hydrophobic polymer is at least about 80% by weight of the polymeric coating layer, e.g., at least about 85 wt%, or at least about 90 wt%, or at least about 95 wt%, or at least about 97 wt%, or at least about 98 wt%, or at least about 99 wt%, or about 100 wt% of the polymeric coating layer.

13. The vapor retarding article of any of claims 1-1 1 , wherein the continuous organic phase comprises less than about 4 wt%, or less than about 3 wt%, or less than about 2 wt%, or less than about 1 wt%, or less than about 0.5 wt%, or less than about 0.1 wt%, or is essentially free of polymeric hydrophilic components.

14. The vapor retarding article of any of claims 1-13, wherein the polymeric coating layer has a coat weight of at least about 10 g/rn2, for example, at least about 20 g/m2, or even at least about 40 g/m2.

15. A method for making a vapor retarding article of any of claims 1 -14, wherein the vapor retarding article is configured to have a water vapor permeance of no more than about 1 Perm (e.g., from about 0.1 Perm to about 1 Perm) at 25% relative humidify, as tested by AST E96 at 23 °C, the method comprising

providing a building material substrate; and

coating a polymeric coating layer onto the building material substrate, the polymeric coating layer being different from the building material substrate, the polymeric coating layer comprising an inorganic hydrophilic particulate filler dispersed in a continuous organic phase comprising a hydrophobic polymer, wherein the content of the filler is from about 30% to about 85% by weight of the polymeric coating layer.