Method of activation of clay and activated clay

Details Method of activation of clay and activated clay Method of activation of clay and activated clay

1995-04-20

1996-11-12

Brunsman, David

Compositions: coating or plastic

Coating or plastic compositions

Aluminum compound containing

501146, 501148, C09C 142

Patent

active

055735835

ABSTRACT:
A method for activating smectite clays to give swelling power and/or dispersibility in an aqueous electrolyte solution and resulting activated smectite clays are disclosed, the method comprising previously adding an adequate amount of an aprotic polar solvent having a higher relative permittivity than those of alcohols (e.g., N,N-dimethylformamide, N,N-dimethylacetamide, ethylene carbonate, propylene carbonate or dimethyl sulfoxide) to an aqueous electrolyte solution in which the clays (or the clays previously suspended) are to be swollen and/or dispersed, or treating the clays to be swollen and/or dispersed with the compound.

REFERENCES:
patent: 3855147 (1974-12-01), Granquist
patent: 4434076 (1984-02-01), Mardis et al.
Nature, vol. 173, No. 4397, Feb. 6, 1954, pp. 255-256.
Clays and Clay Minerals, vol. 22, pp. 361-365, Pergamon Press, 1974, S. Olejnik et al.: Swelling of Montmorillonite in Polar Organic Liquids.
Clay Minerology, Ralph E. Grim, McGraw-Hill Book Company, Inc., 1953, p. 266.

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