Abstract: An organically modified smectite is produced by reacting unfractionated pulverized bentonite with an aqueous dispersion or solution of a methyl benzyl dialkyl ammonium halide salt via cation exchange. The product organoclay is equivalent in quality to a "wet" processed organoclay, and has particular utility as an ingredient in forming invert emulsion drilling mud for enhancing the rheological properties of the mud. An invert emulsion drilling mud derived from an organoclay produced by the method of the present invention will have a viscosity of at least seventy (70) centipoise at 26 C and a 10-second gel strength at 26 C of at least thirty (30) pounds per 100 square feet.

Abstract: Improved reactive color developing substrates for manifold copy systems are produced by controlled acid treatment of smectite clay minerals, followed by severe attrition grinding to produce an aqueous colloidal suspension of the acid treated smectite. Thereupon, the colloidalized acid treated smectite is combined with an aqueous suspension of platy kaolinite, thoroughly blended and co-precipitated by the addition of appropriate flocculants such as aluminum sulfate.

Abstract: Improved reactive color developing substrates for manifold copy systems are produced by controlled acid treatment of smectite clay minerals, followed by severe attrition grinding to produce an aqueous colloidal suspension of the acid treated smectite. Thereupon, the colloidalized acid treated smectite is combined with an aqueous suspension of talc, thoroughly blended and co-precipitated by the addition of appropriate flocculants such as aluminum sulfate.