Mixed metal hydroxides for thickening water or hydrophylic fluids
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United States of America Patent
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Feb 5, 1991
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N/A
app pub date -
Jun 9, 1987
filing date -
Jul 5, 1985
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Abstract
Novel monodispersed crystalline mixed metal layered hydroxide compounds of the general formula are prepared: Li.sub.m D.sub.d T(OH).sub.(m+2d+3+na) A.sub.a.sup.n, where m is an amount from zero to 1; D is a divalent metal; d is the amount of D ions of from zero to 4; T is a trivalent metal; A represents anions or negative-valence radicals of valence n; na is from zero to -3; (m+d) is greater than zero; and (m+2d+3+na) is equal to or greater than 3. The D metal is preferably Mg and the T metal is preferably Al. These compounds are useful as gelling agents which impart beneficial thixotropic properties to various fluids, such as drilling fluids, especially when employed along with fluid loss agents.
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