AQUEOUS DISPERSIONS FOR USE AS COATINGS WITH VARIABLE WATER VAPOR PERMEANCE RATINGS

摘要

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.

主权项

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.