Name: Polymeric Dispersant for Solventborne PDS-400
Brand: Coatingsink
SKU: polymeric-dispersant-solventborne-pds
Availability: InStock

Question 1

How does PDS-400 prevent flooding and floating in solventborne pigment systems?

Accepted Answer

PDS-400 uses a polyurethane-polyacrylate block copolymer architecture: the polyurethane anchor block adsorbs strongly onto organic and inorganic pigment surfaces, while the polyacrylate stabilising block provides steric repulsion in aliphatic and aromatic solvent carriers. This balanced adsorption prevents differential mobility of mixed pigments during film formation, eliminating flooding (horizontal separation) and floating (vertical separation).

Question 2

What pigment types is PDS-400 suitable for, and are there any limitations?

Accepted Answer

PDS-400 is effective for a broad range of organic pigments (phthalocyanines, quinacridones, dioxazines), carbon black, and titanium dioxide in solventborne systems. It is less suited to highly polar inorganic extenders such as calcium carbonate or talc, where lower-cost phosphate-based dispersants are more efficient. Always conduct a rub-out test to verify flooding/floating control in your specific pigment combination.

Question 3

What is the recommended incorporation method for PDS-400 in a bead mill grind?

Accepted Answer

Pre-mix PDS-400 with the pigment and a portion of the solvent before bead milling. Add the full calculated dosage (1–5% on pigment weight) at the start of the grind, not post-grind, to ensure full surface coverage during particle size reduction. Post-addition of dispersant to an already-milled paste rarely achieves equivalent stability and may require higher dosage to compensate.

Appearance	Clear amber liquid
Amine Value	18–24 mg KOH/g
Active Content	50% in aromatic-free solvent blend
Viscosity (25°C)	800–1200 mPa·s
Recommended Dosage	1–5% on pigment weight

Polymeric Dispersant for Solventborne PDS-400

Specifications

FAQ

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