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Non-ionic, hydrophobically modified polyurethane (HEUR) rheology modifier.
Delivers excellent mid-shear viscosity build and outstanding sag resistance in waterborne systems.
Provides low foaming characteristics and good compatibility with common surfactants and co-thickeners.
Enables efficient viscosity control without significantly increasing high-shear viscosity, supporting good application properties.
Stable across a broad pH range (pH 4–10), ensuring robust performance in diverse formulations.
Architectural interior and exterior flat and low-sheen paints.
Waterborne industrial maintenance coatings.
Wood and metal primers and topcoats.
Water-based decorative wall coatings and textured finishes.
Low-VOC and zero-VOC compliant coating systems.
| Chemical Type | Hydrophobically modified polyurethane (HEUR) |
| Product Form | Liquid |
| Appearance | Opaque white to off-white dispersion |
| pH (1% aqueous solution) | 6.5 – 8.5 |
| Active Content | 30 ± 1 wt% |
| Viscosity (25°C, Brookfield RVT, spindle #3, 20 rpm) | 1,500 – 4,500 mPa·s |
| Freeze-Thaw Stability | Passes 3 cycles (−18°C/24 h → 23°C/24 h) |
| Primary Applications | Rheology modification in waterborne architectural and industrial coatings |
Q1: What type of rheology does COAPUR XS 71 provide in waterborne systems?
A: COAPUR XS 71 is a hydrophobically modified polyurethane (HEUR) thickener that delivers strong pseudoplastic (shear-thinning) behavior, providing excellent sag resistance in vertical applications while maintaining good flow and leveling during application.
Q2: Is COAPUR XS 71 compatible with high-solids or low-VOC formulations?
A: Yes — COAPUR XS 71 is specifically designed for modern low-VOC and high-solids waterborne coatings, including architectural paints, industrial finishes, and maintenance coatings, where efficient thickening without compromising environmental compliance is required.
Q3: How should COAPUR XS 71 be incorporated into a formulation?
A: It is typically added late in the manufacturing process, after pigment dispersion and during let-down, under moderate agitation. Pre-dilution with water or co-solvent may aid uniform incorporation and minimize localized over-thickening.
Q4: Does COAPUR XS 71 offer resistance to microbial degradation?
A: As a non-ionic, synthetic polyurethane polymer, COAPUR XS 71 itself is not a nutrient source for microorganisms and does not require preservative addition solely for its own stability — however, full-formulation preservation remains essential per standard industry practice.
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E-mail: wangxingqiang@ericwchem.com
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