Patent ID: 6914081
Filing Date: 2005-07-05
Classification: B01J,C09K

Abstract:
1. A method of making a rheology-modified aqueous composition comprising admixing a material whose constituents conform to the proportions of the empirical formula where M′ represents at least one divalent metal cation selected from the group consisting of Mg, Ca, Mn, Fe, Co, Ni, Cu, and Zn and m is an amount of from greater than zero to about 8; where M″ represents at least one trivalent metal cation selected from the group consisting of Al, Ga and Fe and n is an amount of from greater than zero to about 6; where A is an anion or negative-valence radical that is monovalent or polyvalent, and a is an amount of A of valence q, provided that if A is monovalent, a is from greater than zero to about 8, and if A is polyvalent, a is from greater than zero to about 4; where B is a second anion or negative-valence radical that is monovalent or polyvalent, and where b is an amount of B of valence r and b is from zero to about 4; provided (m+n) is greater than or equal to 1; further provided qa+br cannot be greater than 2m+3n, and provided that qa cannot equal 2m+3n, and still further provided that (2m+3n+qa+br) is less than 3; where xH where the material is a calcined hydrotalcite or hydrotalcite-like compound, or mixture thereof, wherein the calcination is carried out in the presence of greater than about 1,000 ppm of sodium; with at least a day and water to form a rheology-modified aqueous composition.