C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
400/1616
C04B 28/14 (2006.01)
Patent
CA 1080870
APPLICATION FOR LETTERS PATENT FOR IMPROVED WATER-RESISTANT GYPSUM COMPOSITION AND PRODUCTS, AND PROCESS OF MAKING SAME ABSTRACT OF THE DISCLOSURE An improved water-resistant cementitious composition and products made therefrom are provided by forming an aqueous cementitious slurry, as for example of calcined gypsum and adding to the slurry a composition in the form of an aqueous emulsion of asphalt and wax, a minor proportion of polyvinyl alcohol and a minor proportion of a borate compound, that is, one having an anion comprising boron and oxygen, as for example borax. The slurry is set in con- ventional manner by heating and drying. The resulting product has a high degree of water-resistance while uti- lizing less asphalt and wax composition than required with conventional asphalt-wax emulsions thereby accomplishing a large savings in raw material costs. Additionally, the use of a small amount of the borate compound permits a smaller amount of the relatively expensive polyvinyl alcohol to be used without a reduction in the water-resistance of the final product. Alternatively, an amount of asphalt and wax composition may be utilized equal to or greater than that conventionally used, but obtaining a much greater degree of water-resistance.
274124
Company United States Gypsum
Na
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