Thermally stable thickener

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

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524446, 524447, 524450, 524591, C08K 334

Patent

active

044368623

ABSTRACT:
A thermally stable thickener is composed of a stabilizing 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.

REFERENCES:
patent: 3923926 (1975-12-01), Harada et al.
patent: 4351754 (1982-09-01), Dupre
patent: 4365030 (1982-12-01), Oswald et al.
patent: 4412018 (1983-10-01), Finlayson et al.

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