Nanoparticulate anionic clays

Details Nanoparticulate anionic clays Nanoparticulate anionic clays

2007-12-25

2007-12-25

Gulakowski, Randy (Department: 1712)

Colloid systems and wetting agents; subcombinations thereof; pro

Continuous liquid or supercritical phase: colloid systems;...

Aqueous continuous liquid phase and discontinuous phase...

C516S009000, C516S077000, C516S078000, C516S927000, C977S773000, C977S786000, C977S810000, C977S900000

Reexamination Certificate

active

10850489

ABSTRACT:
A composition of matter comprising anionic clay having the general formulain-line-formulae description="In-line Formulae" end="lead"?[M2+1-xM3+x(OH)2]x+(x
)An−·yH2O  (I)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?orin-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?[M1+M3+2(OH)6]1+(1
)An−·yH2O;  (II)in-line-formulae description="In-line Formulae" end="tail"?where M1+is a mono-valent metal; M2+is a divalent metal; and M3+is a trivalent metal; A is an inorganic or organic anion, chosen such that the rule of charge neutrality is obeyed; n is an integer; x is any rational number between 0 and 1; and y is any rational number between 0 and 10; where the anionic clay is in the form of particles having a volume weighted mean particle size diameter of less than 500 nm. Stable colloidal dispersions comprise such anionic clay particles having a volume weighted mean particle size diameter of less than 500 nm dispersed in a liquid medium. Method for preparing such stable colloidal dispersion of anionic clay particles comprises simultaneously bringing together salt solutions of M2+and M3+metals, or of M1+and M3+metals, and a base in a high shear mixing zone within a liquid dispersion medium in a particle precipitation vessel, and precipitating anionic clay particles having a volume weighted mean particle size diameter of less than 500 nm.

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