R29 has high molecular weight and strong thickening ability as well as anti-sediment and mold resistence. It is easy to use, as an alkali swelling rheological modifier, when diluted with water and neutralized with alkali, the emulsion particles expand quickly, under this condition, the emulsion will become clear and very viscous, and, the fluidity and leveling performance of the paint are improved. This thickener is high efficiency with little using amount. It has excellent rheology and can reduce syneresis. It is compatible with organic or inorganic pigments. It has excellent high-shear viscosity and can improve leveling and splash resistance. It has good gloss retention, good brush resistance, and good anti-caking ability.