Shingles with increased hydrophobicity

Abstract

One exemplary embodiment of a shingle includes a substrate, a surface layer of granules, a backdust layer, and hydrophobic material. The substrate is infiltrated with asphalt to form a first asphalt coating on the top or upper surface of the substrate and a second asphalt coating on the bottom or lower surface of the substrate. A surface layer of granules is embedded in the first asphalt coating. A backdust layer of particles is embedded in the second asphalt coating. A hydrophobic material is applied to at least one of the surface layer and the backdust layer.

1 . A shingle, comprising
 a substrate infiltrated with asphalt forming a first asphalt coating on the top or upper surface of the substrate and a second asphalt coating on the bottom or lower surface of the substrate;   a surface layer of granules embedded in the first asphalt coating a;   a backdust layer of particles embedded in the second asphalt coating; and   a hydrophobic material applied to at least one of the surface layer and the backdust layer.   
     
     
         2 . The shingle of  claim 1 , wherein the contact angle of the surface with the hydrophobic material is greater than about 70 degrees. 
     
     
         3 . The shingle of  claim 1 , wherein the contact angle of the surface with the hydrophobic material is greater than about 80 degrees. 
     
     
         4 . The shingle of  claim 1 , wherein the contact angle of the surface with the hydrophobic material is greater than about 90 degrees. 
     
     
         5 . The shingle of  claim 1 , wherein the hydrophobic material sufficiently prohibits moisture from infiltrating between stacked shingles such that less than 25% of the bottom surface area of the top shingle is wet. 
     
     
         6 . The shingle of  claim 1 , wherein the hydrophobic material is a coating. 
     
     
         7 . The shingle of  claim 6 , wherein the backdust particles are coated with the hydrophobic material. 
     
     
         8 . The shingle of  claim 7 , wherein the backdust particles are coated with the hydrophobic material prior to being embedded into the second asphalt coating. 
     
     
         9 . The shingle of  claim 6 , wherein a portion of the back or lower surface of the shingle is coated with the hydrophobic material. 
     
     
         10 . The shingle of  claim 6 , wherein a portion of the top or upper surface of the shingle is coated with the hydrophobic material. 
     
     
         11 . The shingle of  claim 6 , wherein at least one of the backdust particles and granules are coated with the hydrophobic material. 
     
     
         12 . The shingle of  claim 6 , wherein the hydrophobic material is a silane solution. 
     
     
         13 . The shingle of  claim 12 , wherein the silane solution is a methyl silane solution. 
     
     
         14 . The shingle of  claim 12 , wherein the concentration of silane is between about 0.25% and 2%. 
     
     
         15 . The shingle of  claim 12 , wherein between about 0.5 g and 2 g of silane is applied per square. 
     
     
         16 . The shingle of  claim 15 , wherein about 1.1 g of silane is applied per square. 
     
     
         17 . The shingle of  claim 1 , wherein the hydrophobic material comprises particles included in at least one of the backdust particles and granules of the shingle. 
     
     
         18 . The shingle of  claim 17 , wherein substantially all of at least one of the backdust particles and granules of the shingle are hydrophobic material particles. 
     
     
         19 . The shingle of  claim 17 , wherein the majority of at least one of the backdust particles and granules of the shingle are hydrophobic material particles. 
     
     
         20 . The shingle of  claim 17 , wherein the hydrophobic material comprises Titanium mineral particles. 
     
     
         21 . The shingle of  claim 17 , wherein the hydrophobic material comprises Titanium dioxide particles. 
     
     
         22 . The shingle of  claim 14 , wherein 0.25% TiO 2  was added to the backdust particles before the backdust was applied to the back of the shingle.