Elementis Specialties, Inc.

Mahalingam Santhanam

Wilbur S Mardis

Keith R McNally

An improved thickening composition for organic systems, including paints and coatings, is described. The additive provides paints and coatings more than adequate viscosity improvement without affecting intercoat adhesion characteristics. REEXAMINATION RESULTS The questions raised in reexamination request no. 90/007130, filed Jul. 21, 2004, have been considered and the results thereof are reflected in this reissue patent which constitutes the reexamination certificate required by 35 U. S. C. 307 as provided in 37 CFR 1.570(e), forreexamination, or the reexamination certificate required by 35 U. S. C. 316 as provided in 37 CFR 1.997(e) forreexamination.

Rheological additives and paint and coating compositions containing such additives exhibiting improved intercoat adhesion

An improved thickening composition for organic systems, including paints and coatings, is described. The additive provides paints and coatings more than adequate viscosity improvement without affecting intercoat adhesion characteristics.

This invention is of a drilling fluid composition containing a liquid thixotrope, which thixotrope is free of solvents or any other diluent, and is in easily usable, liquid form, pourable at ambient temperatures, and which provides effective and efficient rheological properties when used at low levels in such compositions. In a specific aspect, the invention provides an oil or oil invert emulsion drilling fluid composition containing one or more organoclays, and in addition contains a additive which comprises the reaction product of an alkoxylated nitrogen containing compound or a diamine, and one or more polycarboxylic acids in a specified equivalent ratio.

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Plainsboro, NJ, United States of America

Mahalingam Santhanam