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US 12,515,989 B2Granted
Wax dispersion composition containing lignin for imparting water resistance to gypsum
AssigneeWalker Industries Holdings Limited
InventorsLaurence Anthony Sinnige, Niels Mathieu Barbara Smeets, Rebecca Katie Hum
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Abstract
Aqueous water repellency dispersions for use in the manufacture of gypsum wallboard, comprising a wax phase including a wax and a functionalized wax, an aqueous phase including a Kraft lignin and a water soluble base in an amount sufficient to solubilize the Kraft lignin.
Claims18
An aqueous water repellency dispersion for use in the manufacture of gypsum wallboard comprising:
- a wax,
- a functionalized wax having an acid value, AV,
- a Kraft lignin, and
- a water soluble base,
- wherein the water soluble base is present in the dispersion in an amount sufficient to (i) solubilize the Kraft lignin and (ii) neutralize the acid value (AV) of the functionalized wax,
- and wherein:
- the wax and the functionalized wax comprise a wax phase that is 30 to 45 w/w % of the total aqueous water repellency dispersion;
- and
- the wax phase contains 3-14 w/w % functionalized wax relative to the total amount of wax.
6 more elements
Dependencies are inferred from the claim text.