Back to results
US 6,893,752 B2Granted
Mold-resistant gypsum panel and method of making same
AssigneeUnited States Gypsum Company
InventorsSrinivas Veeramasuneni, Rodney Phillip Musselman
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeUnited States Gypsum Company
InventorsSrinivas Veeramasuneni, Rodney Phillip Musselman
Estimating the term…
A mold-resistant gypsum panel includes a core of an interlocking matrix of calcium sulfate dihydrate crystals, a facing material on at least one side of the panel and a salt of pyrithione dispersed through both the core and the facing materials. A method of making a mold-resistant gypsum product is also provided. A slurry of calcined gypsum, water and a water-soluble pyrithione salt is formed, then deposited on a sheet of facing material. The slurry on the facing material is shaped into a panel and maintained under conditions sufficient for the calcined gypsum to react with the water to form a core comprising an interlocking matrix of set gypsum crystals. Heating of the panel causes evaporation of the water that did not react with the calcined gypsum.
A method of making a mold-resistant gypsum product comprising:
A method of making a mold-resistant gypsum product comprising:
A mold-resistant gypsum panel having a plurality of sides, comprising a core of at least ⅛ inch thickness of an interlocking matrix of calcium sulfate dihydrate crystals, a facing material on at least one side of said panel and having at least 100 ppm of a salt of pyrithione calculated as the equivalent sodium salt and based on the weight of the calcium sulfate dihydrate and being dispersed through said core and said facing material.
A mold-resistant gypsum panel made according to a process comprising:
Dependencies are inferred from the claim text.