Aqueous dispersions for use as coatings with variable water vapor permeance ratings

Abstract

Certain embodiments described herein are directed articles that include a cellulosic substrate (or a non-cellulosic substrate) and an aqueous dispersion disposed on the substrate. In certain examples, the dispersion is effective to provide a water vapor perm rating of about 2 perms or less at 25% average RH as tested by ASTM D1653, or about 2 perm or less at 25% average RH as tested by ASTM E96, when the dispersion is cured as a coating on the substrate. In some embodiments, the substrate can be (or can be part of) a building substrate such as, for example, kraft paper placed on insulation (e.g., fiberglass insulation) or oriented strand board. In some instances, the aqueous dispersion can include a plant oil macromonomer or a waterborne epoxy resin.

1 . An article comprising:
 a substrate selected from the group consisting of cellulosic substrates, non-cellulosic substrates, and combinations thereof;   an aqueous dispersion disposed on the substrate and effective to provide a variable water vapor perm rating as a function of humidity, in which the water vapor perm rating is about 2 perm or less at 25% average RH, as tested by ASTM D1653; or 2 perm or less at 25% average RH, as tested by ASTM E96, when the aqueous dispersion is cured as a coating on the substrate.   
     
     
         2 . The article of  claim 1 , in which the cured coating is further effective to provide a water vapor perm rating of less than or equal to 5 perms at 45% average RH as tested by ASTM D1653, or less than or equal to 5 perms at 45% average RH as tested by ASTM E96. 
     
     
         3 . (canceled) 
     
     
         4 . (canceled) 
     
     
         5 . The article of  claim 1 , in which the aqueous dispersion comprises a plant oil macromonomer dispersion. 
     
     
         6 . (canceled) 
     
     
         7 . (canceled) 
     
     
         8 . The article of  claim 1 , further comprising a reactant added to the aqueous dispersion. 
     
     
         9 . (canceled) 
     
     
         10 . (canceled) 
     
     
         11 . The article of  claim 8 , in which the aqueous dispersion comprises a waterborne epoxy resin dispersion and the reactant comprises an amine. 
     
     
         12 . (canceled) 
     
     
         13 . The article of  claim 8 , further comprising at least one filler added to the waterborne macromonomer dispersion and the reactant. 
     
     
         14 . The article of  claim 13 , further comprising a stain-resistance additive in the dispersion. 
     
     
         15 . The article of  claim 1 , in which the aqueous dispersion is substantially free of polyamides. 
     
     
         16 . An article comprising:
 a substrate selected from the group consisting of cellulosic substrates, non-cellulosic substrates, and combinations thereof; and   a plant oil macromonomer dispersion disposed on the substrate and effective to provide a variable water vapor perm rating, as tested by ASTM D1653 or ASTM E96, when the plant oil macromonomer dispersion is cured as a coating on the substrate.   
     
     
         17 . The article of  claim 16 , in which the variable water perm rating is about 2 perms or less at 25% average RH, is less than or equal to 5 perms at 45% average RH, is about 12 perms to about 24 perms at 75% average RH, and is greater than 25 perms at 95% average RH as tested by ASTM D1653, or about 2 perm or less at 25% average RH, is less than or equal to 5 perms at 45% average RH, is about 6 perms to about 12 perms at 75% average RH, and is greater than 11 perms at 95% average RH as tested by ASTM E96. 
     
     
         18 . (canceled) 
     
     
         19 . The article of  claim 17 , in which the plant oil macromonomer dispersion is a vegetable oil macromonomer dispersion. 
     
     
         20 . The article of  claim 19 , in which the vegetable oil macromonomer dispersion further comprises a reactant. 
     
     
         21 . (canceled) 
     
     
         22 . The article of  claim 20 , further comprising a filler in the dispersion. 
     
     
         23 . (canceled) 
     
     
         24 . The article of  claim 22 , further comprising a surfactant in the dispersion. 
     
     
         25 - 31 . (canceled) 
     
     
         32 . The article of  claim 16 , in which the cellulosic substrate is kraft paper. 
     
     
         33 . (canceled) 
     
     
         34 . The article of  claim 16 , further comprising a building material coupled to the cellulosic substrate. 
     
     
         35 . (canceled) 
     
     
         36 . An article comprising:
 a substrate selected from the group consisting of cellulosic substrates, non-cellulosic substrates, and combinations thereof; and   a waterborne epoxy resin dispersion disposed on the substrate and effective to provide a variable water vapor perm rating, as tested by ASTM D1653 or ASTM E96, when the waterborne epoxy resin dispersion is cured as a coating on the substrate.   
     
     
         37 . The article of  claim 36 , in which the variable water perm rating is about 2 perms or less at 25% average RH, is less than or equal to 5 perms at 45% average RH, is about 12 perms to about 24 perms at 75% average RH, and is greater than 25 perms at 95% average RH as tested by ASTM D1653, or about 2 perm or less at 25% average RH, is less than or equal to 5 perms at 45% average RH, is about 6 perms to about 12 perms at 75% average RH, and is greater than 11 perms at 95% average RH as tested by ASTM E96. 
     
     
         38 . The article of  claim 3 , in which the waterborne epoxy resin is a waterborne solid epoxy resin. 
     
     
         39 . (canceled) 
     
     
         40 . The article of  claim 38 , further comprising a reactant added to the aqueous dispersion. 
     
     
         41 . (canceled) 
     
     
         42 . The article of  claim 40 , further comprising a filler in the dispersion. 
     
     
         43 . (canceled) 
     
     
         44 . (canceled) 
     
     
         45 . The article of  claim 42 , further comprising a surfactant in the dispersion. 
     
     
         46 - 54 . (canceled) 
     
     
         55 . The article of claim  46   36 , further comprising a polyamide in the dispersion. 
     
     
         56 - 153 . (canceled)