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Rheology modified compositions and modification agents

  • US 20030078306A1
  • Filed: 09/04/2001
  • Published: 04/24/2003
  • Est. Priority Date: 01/06/2000
  • Status: Active Grant
First Claim
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1. A method of making a rheology-modified aqueous composition comprising admixing a material or materials whose constituents substantially conform to the proportions of the empirical formula M′

  • mM″

    n(OH)(2m+3n+qa+br)(Aq)a(Br)b.xH2O, where M′

    represents at least one divalent metal cation and m is an amount of from greater than zero to about 8;

    where M″

    represents at least one trivalent metal cation 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 ions 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 ions 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; and

    where xH2O represents excess waters of hydration, with x being zero or more;

    with at least a clay and water to form a rheology-modified aqueous composition.

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