C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 28/14 (2006.01) C04B 22/16 (2006.01) C04B 41/70 (2006.01)
Patent
CA 2268105
The invention provides a set gypsum-containing product having increased resistance to permanent deformation and a method for preparing it comprising forming a mixture of a calcium sulfate material, water, and an appropriate amount of one or more enhancing materials chosen from condensed phosphoric acids, each of which comprises 2 or more phosphoric acid units; and salts or ions of condensed phosphates each of which comprises 2 or more phosphate units. The mixture is then maintained under conditions sufficient for the calcium sulfate material to form a set gypsum material.
L'invention concerne un produit contenant du gypse durci, ayant une résistance accrue à la déformation permanente et son procédé de production, qui consiste à former un mélange d'un matériau au sulfate de calcium, d'eau, et d'une dose appropriée d'un ou plusieurs matériaux amplificateurs choisis parmi les acides phosphoriques condensés, chacun comprenant au moins 2 unités d'acide phosphorique; et des sels ou des ions de phosphates condensés, chacun comprenant au moins 2 unités de phosphate. Le mélange est ensuite maintenu dans des conditions suffisantes pour que le matériau au sulfate de calcium forme un matériau au gypse durci.
Groza Brent E.
Henkels Paul J.
Jones Frederick T.
Mlinac Raymond J.
Sucech Steven W.
Company United States Gypsum
Macrae & Co.
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