Dow Acrysol DR-50 Associative Alkali-Swellable Thickener

Features Of Dow Acrysol DR-50 Associative Alkali-Swellable Thickener

1. Delivers high mid-shear viscosity for excellent sag resistance and brush/roller application performance.

2. Provides superior flow and leveling control in waterborne architectural and industrial coatings.

3. Offers outstanding compatibility with common surfactants, co-thickeners, and pigment dispersants.

4. Delivers robust rheology retention after freeze-thaw cycling and long-term storage.

5. Enables efficient thickening at low dosage levels with minimal impact on color development and gloss.

Typical Applications Of Dow Acrysol DR-50 Associative Alkali-Swellable Thickener

1. Interior and exterior architectural flat and low-sheen latex paints.

2. Waterborne industrial maintenance coatings for metal and concrete substrates.

3. Acrylic-based primers and sealers requiring balanced viscosity and open time.

4. Textured decorative coatings and elastomeric wall systems.

5. Low-VOC and zero-VOC compliant coating formulations.

Specifications Of Dow Acrysol DR-50 Associative Alkali-Swellable Thickener

Dow Acrysol DR-50 Associative Alkali-Swellable Thickener – Frequently Asked Questions (FAQ)

Q1: How does DR-50 differ from conventional non-associative alkali-swellable thickeners (ASE)?

A: DR-50 is an associative alkali-swellable thickener (A-ASE), meaning it contains hydrophobic groups that enable intermolecular association in addition to the typical acid–base swelling mechanism. This provides superior rheology control—especially enhanced high-shear viscosity recovery, better sag resistance, and improved leveling—compared to traditional non-associative ASE thickeners.

Q2: What pH range is required for optimal activation and viscosity development?

A: DR-50 requires alkaline conditions to fully ionize and swell; effective thickening typically begins above pH 7.5 and is most robust between pH 8.5 and 10.5. Viscosity development is progressive with increasing pH, but excessive alkalinity (e.g., >11.5) may compromise long-term stability or compatibility in some systems.

Q3: Can DR-50 be used in combination with other rheology modifiers, such as HEC or hydrophobically modified ethoxylated urethanes (HEUR)?

A: Yes, DR-50 is commonly blended with HEUR thickeners to achieve balanced low-, mid-, and high-shear viscosity profiles. It is generally compatible with many cellulose ethers (e.g., HEC), though synergy or antagonism depends on formulation specifics—including surfactant package, co-solvents, and ionic strength—so lab-scale evaluation is recommended before full-scale implementation.

Q4: How should DR-50 be incorporated into a water-based formulation?

A: DR-50 is supplied as a liquid latex and is typically added during the let-down stage, after primary emulsion polymer particles are formed and pH has been adjusted to ≥8.0. For best dispersion and viscosity development, add slowly with moderate agitation and allow sufficient time (e.g., 15–30 minutes) for full swelling and associative network formation before final adjustments.