Georgia Kaolin Company, Inc.

Thomas F Walsh

Thomas D Thompson, Iii

Frank J Botta

Andrew Torok

An organoclay functional as a rheological modifier for control of the viscosity and thixotropy of polyester-styrene compositions is prepared by a dry process wherein a quaternary ammonium salt is reacted with unfractionated smectite in an aqueous dispersion thereby eliminating the fractionating step required in the typical prior art wet process as exemplified by U.S. Pat. No. 4,240,951 and permitting the preparation of the organoclay rheological modifier to be carried out at a high solids content thereby reducing drying costs in the recovery of the product organoclay.

Rheological control of polyester-styrene resin compositions by addition

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.

Preparation of organically modified smectites by treatment with methyl

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.

Reactive color developing substrates for manifold copy systems and

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.

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Florham Park, NJ, United States of America

Thomas F Walsh