Building assembly containing a water barrier coating film and method of making the building assembly
AssigneeCertainTeed Gypsum, Inc.
InventorsJeffrey H. Peet, Michael J. Lemberger, Natacha Huynh, Nicole Love
Life of this patent
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Abstract
A building assembly can include a substrate and a water barrier coating film. The water barrier coating film can include a thermoplastic polymer and microporous particles, such as microporous glass beads. The water barrier coating film can provide a good protection towards liquid water but may allow water vapor flow from the substrate through the coating film. The water vapor permeability of the water barrier coating film can be at least 2 US perms as tested according to ASTM E96 (2014) at 21° C. and 50% average relative humidity.
Claims19
A building assembly comprising a substrate and a water barrier coating film, wherein
- the substrate comprises a first surface and a second surface opposite to the first surface, and the coating film overlies the first surface, the second surface, or the first surface and the second surface of the substrate;
- the coating film comprises a thermoplastic polymer and microporous particles, the microporous particles having an average particle size of at least 250 microns;
- the average particle size of the microporous particles contained in the coating film is at least equal to a thickness of the coating film at positions which do not contain microporous particles;
- and
- the coating film has a water vapor permeability of at least 2 US perms as tested according to ASTM E96 (2014) at 21° C. and 50% average relative humidity.
A method for making a building assembly, comprising:
- providing a substrate comprising a first surface and a second surface opposite to the first surface;
- preparing a water barrier coating film comprising a thermoplastic polymer and microporous particles, the microporous particles having an average particle size of at least 250 microns;
- and
- applying the water barrier coating film on the first surface, the second surface, or the first surface and second surface of the substrate,
- wherein the average particle size of the microporous particles contained in the coating film is at least equal to a thickness of the coating film at positions which do not contain microporous particles.
A water barrier coating film, comprising a thermoplastic polymer and microporous particles, the water barrier coating film having a water vapor permeability of at least 2 US perms as tested according to ASTM E96 (2014) at 21° C. and 50% average relative humidity, wherein the microporous particles have an average particle size of at least 250 microns, and the average particle size of the microporous particles contained in the coating film is at least equal to a thickness of the coating film at positions which do not contain microporous particles.
Dependencies are inferred from the claim text.