METHOD UPON A TEMPERATURE INCREASE OF COUNTERACTING A VISCOSITY DECREASE OR PROVIDING A VISCOSITY INCREASE IN A WATER-BASE SYSTEM CONTAINING A POLYMER AS VISCOSITY AGENT

摘要

The invention relates to a method in a water-basesystem for at least partially avoiding an expected vis-cosity decrease or providing a viscosity increase upona temperature increase, by using a system containing asviscosity-adjusting agents a nonionic cellulose etherin such an amount that the aqueous solution thereof hasa viscosity of 10-10,000 cP, measured according toBrookfield LV, 12 rpm at 20°C, and an ionic surface-active compound in an amount of 1-30 mmol per litre ofwater.