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-base system for at least partially avoiding an expected viscosity decrease or providing a viscosity increase upon a temperature increase, by using a system containing as viscosity-adjusting agents a nonionic cellulose ether in such an amount that the aqueous solution thereof has a viscosity of 10-10,000 cP, measured according to Brookfield LV, 12 rpm at 20 DEG C, and an ionic surface-active compound in an amount of 1-30 mmol per litre of water.