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US 2023/0265016 A1Published application
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.
Claims25
An aqueous water repellency dispersion for use in the manufacture of gypsum wallboard comprising:
- a wax,
- a functionalized wax,
- a Kraft lignin, and
- a water soluble base in an amount sufficient to solubilize the Kraft lignin, wherein the amount of base is determined based on a minimum equivalent base mass ratio (β) plus sufficient base to neutralize the acid value (AV) of the functionalized wax, and
- wherein,
- when the base has a pKa≥9.4, a minimum β is about 0.07 and when the base has a pKa<9.4 a minimum β is in the range of 0.17 to greater than 0.07.
3 more elements
Dependencies are inferred from the claim text.