Associative thickener combinations

摘要

A method for improving the viscosity stability of an aqueous composition having a latex polymer and
a first associative thickener having at least one hydrophilic segment and at least two hydrophobic segments and a Mw less than 30,000;
a second associative thickener having at least one hydrophilic segment and at least two hydrophobic segments and a Mw of at least 1.5 times the Mw of the first associative thickener segment, the hydrophobic segments of the first associative thickener and the second associative thickener having a hydrophobic substituent of at least four carbon atoms and a concentration of the second associative thickener being greater than 1.5 times a concentration of the first associative thickener.