Mold-resistant gypsum panel and method of making same

Details Mold-resistant gypsum panel and method of making same Mold-resistant gypsum panel and method of making same

2005-05-17

2005-05-17

Jones, Deborah (Department: 1775)

Stock material or miscellaneous articles

Composite

Of inorganic material

C428S070000, C428S470000, C428S704000, C428S332000, C106S018320, C106S680000, C106S772000, C106S781000, C106S783000, C106S785000, C427S388400, C156S039000, C156S045000, C264S333000

Reexamination Certificate

active

06893752

ABSTRACT:
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.

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