Thermally stable thickener

Details Thermally stable thickener Thermally stable thickener

C - Chemistry, Metallurgy

08

L

400/7402, 400/74

C08L 75/04 (2006.01) C08G 18/10 (2006.01) C08J 3/00 (2006.01) C08K 3/34 (2006.01) C09D 7/00 (2006.01)

Patent

CA 1244575

ABSTRACT OF THE DISCLOSURE A thermally stable thickener is composed of a stabiliz- ing agent and a water dispersible polyurethane. The stabilizing agent is a smectite-type clay having a cation exchange capacity of at least 75 milliequivalents per 100 grams of clay, 100% active clay basis. The water dispersible polyurethane must possess the property that it forms an aqueous composition that experiences a decrease in Stormer viscosity upon thermal aging. Aqueous compositions incorporating the thermally stable thickener may be exposed to extended periods at elevated temperatures without substantially affecting the level of thickening. -49-

455560

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