Adducts of clay and activated mixed metal oxides

Details Adducts of clay and activated mixed metal oxides Adducts of clay and activated mixed metal oxides

B - Operations, Transporting

28

C

B28C 3/00 (2006.01) B28C 1/00 (2006.01) C09K 8/14 (2006.01) C09K 8/84 (2006.01) C10M 125/10 (2006.01) C10M 177/00 (2006.01)

Patent

CA 2089572

2089572 9218238 PCTABS00016 Adducts of clay, especially of the smectite variety, most especially bentonite, are prepared with an effective amount of at least one activated mixed metal oxide or oxy-hydroxide (AHMMO) formed by dehydrating hydrotalcite or a mixture comprising magnesium oxide and aluminum oxide, or a crystalline mixed metal hydroxide conforming substantially to the formula LimDdT(OH)(m+2d+3+n.a)(An)a.xH2O where m is zero to one, D is a divalent metal, d is from zero to 4, T is a trivalent metal, A represents at least one anion or negative-valence radical of valence n, where n is 1 or more, (m+2d+3+n.a) is equal to or greater than 3, (m+d) is greater than zero, and xH2O represents excess waters of hydration. These adducts are useful, e.g., in drilling muds and in viscosity modification of a wide variety of fluids.

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