DISPERBYK® 161 is a wetting and dispersing additive for solvent-borne automotive and industrial coatings and pigment concentrates. It is particularly effective in stabilizing fine particle size carbon blacks and organic pigments, especially in two-pack PU and baking systems. It offers outstanding reduction of millbase viscosity.

Chemical Family: Polyurethanes (PU)

Features: High Color Strength, High Gloss, Reduces Mill Base Viscosity, Transparency

Enhanced TDS

Identification & Functionality

Features & Benefits

CASE Ingredients Features
Key Features
  • The additive defl occulates pigments and stabilizes them by means of steric hindrance.
  • It provides equal electrical charge to the pigment particles.
  • The resulting repulsion and the steric stabilization prevent a possible co-fl occulation, which leads to fl ood and fl oat-free color in pigment mixtures.
  • The defl occulating properties of the additive increase gloss, color strength, transparency, and hiding power and reduce the viscosity of the millbase.

Applications & Uses

Markets
Applications
Coating End Applications
Industrial Additives End Use
Use Level
70 - 140% (Carbon Blacks), 30 - 90% (Organic Pigments), 5 - 6% (Titanium Dioxide), 10 -15% (Inorganic Pigments)
Processing Instructions
  • For optimum performance, the additive must be incorporated into the millbase before addition of pigments.
  • The resin and solvent components of the millbase are pre-mixed and then the additive is slowly incorporated while stirring continuously.
  • Do not add the pigments until the additive has been fully distributed.

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Flash Point38°C-
SolventsMethoxypropylacetate/Butylacetate 6/1--
Non-Volatile Matter (20 min, at 150°C)30%-
Density (at 20°C)1.02g/ml-
Amine Value11mg KOH/g-
SDS Physical and Chemical Properties
ValueUnitsTest Method / Conditions
Ignition Temperature (at 200°C)min. 392°FDIN 51794
Immiscible InWater--
Density (at 20°C)1.015g/cc4 (Oscillating U-tube, at 20°C)
Lower Explosion Limit1.2%V-
Flash Point38°C48 (Abel-Pensky)
Vapor Pressure (at 20°C)60000000hPaDerived
Initial Boiling Point124°CDerived
pH Value (at 20°C, 1% Concentration)5-Universal pH Value Indicator
OdorEster-like--
AppearanceColorless liquid--
Upper Explosion Limits12%V-
Special Note
  • The after-treatment of some organic pigments may negatively affect the effi ciency of the additive.
  • In such cases, tests with the untreated pigment of the same type may be successful.
  • When used in coil coatings, the interaction of this cationic additive with the acid catalyst must be taken into account.
  • Amine-blocked acids are less suitable than free acids or epoxy-blocked acids.
  • This problem can be avoided by using additives from the DISPERBYK-170 product line.

Storage & Handling

Storage Information

Separation or turbidity may occur at temperatures below 0 °C. Warm to 20 °C and mix well.