Rheovis PU20 Urethane based polymers Ciba Rheology Modifier/ Thickener >> Associative >> Urethane (HEUR) Coatings >> Waterborne Wood & Furniture Coatings water RHEOVIS PU10 and RHEOVIS PU20 are derivatives of a family of highly effective rheological control additives for water-born inks and water-borne coatings. &KHPLFDO 1DWXUH RHEOVIS PU10 and RHEOVIS PU20 are formulations of urethane based polymers in water/butyldiglycol and water respectively. RHEOVIS PU10 and RHEOVIS PU20 are excellent rheological control additives offering an outstanding balance of low viscosity at low shear rates and high viscosity at high shear rates. This property is derived from the molecular bulk of the urethane polymer as well as its association with other components of the formulation, especially resins, and results in excellent flow, levelling and brush drag properties, even in the absence of coalescing solvents. The main application for RHEOVIS PU10 and RHEOVIS PU20 are high-build coatings, e.g. high quality wood coatings. The choice between the two products is dictated by the detailed rheological requirements of the targeted application. RHEOVIS PU10 and RHEOVIS PU20 are effective over the pH range 4-10 thus allowing optimal formulation flexibility. Rheology control additives with an urethane based polymer back-bone, like RHEOVIS PU10 and RHEOVIS PU20 may potentially allow formulation of paints with close to ideal rheology, i.e. hardly any change of dynamic viscosity over a wide shear rate interval. This is of special advantage when the formulator wants to offer maximum handling flexibility to the applicators. However, the achievable rheology behaviour in a given system also depends on the type and concentration of other paint components, namely surfactants and coalescence solvents. Depending on the choice of the coalescing solvent, relatively small amounts may result in significantly increased or reduced viscosity. In case of too low viscosity at low shear rates (settlement of liquid paint formulation during storage or sagging after application) it is recommended to use a synergistic combination with complementary additives such as RHEOVIS CR, RHEOVIS CRX and VISCALEX HV30 (increasing thixotropic effects). RHEOVIS PU10 and RHEOVIS PU20 may be poured into the ink or coating formulation anywhere in the process. Mainly for practical reasons post-addition of the products is recommended. Pre-dilution of RHEOVIS PU10 and RHEOVIS PU20 should not be neccesary as they are supplied at a very manageable viscosity. If, however, dilution of RHEOVIS PU10 is required, it is recommended that this is done with a water/butyl diglycol mixture (same solvent mix as in the supplied form). Dilution with small portions of water without co-solvent results in an increase of the viscosity to a maximum, followed by a rapid decrease when diluted further. RHEOVIS PU20 does not show this phenomena and consequently may be diluted with water alone. The amount of RHEOVIS PU10 or RHEOVIS PU20 required for optimum performance should be determined in trials covering a concentration range. Derivative of a family of highly effective rheological control additives for water-borne coating systems. Excellent rheological control additives offering an outstanding balance of low viscosity at low shear rates and high viscosity at high shear rates. This property is derived from the molecular bulk of the urethane polymer as well as its association with other components of the formulation, especially resins and results in excellent flow, levelling and brush drag properties, even in the absence of coalescing solvents. The main application are high-build coatings, e.g. high quality wood coatings. Effective over the pH range 4-10 thus allowing optimal formulation flexibility. Allows formulation of paints with close to ideal rheology, i.e. hardly any change of dynamic viscosity over a wide shear rate interval. This is of special advantage when the formulator wants to offer maximum handling flexibility to the applicators. However, the achievable rheology behaviour in a given system also depends on the type and concentration of other paint components, namely surfactants and coalescence solvents. Depending on the choice of the coalescing solvent, relatively small amounts may result in significantly increased or reduced viscosity. In case of too low viscosity at low shear rates (settlement of liquid paint formulation during storage or sagging after application) it is recommended to use a synergistic combination with complementary additives (increasing thixotropic effects). Recommended usage level: 0.5-1.5% based on total formulation. may be poured into the coating formulation anywhere in the process. Mainly for practical reasons post-addition of the products is recommended. Pre-dilution should not be neccesary as they are supplied at a very manageable viscosity.If, however, dilution is required, may be diluted with water alone.