Shear Thinning Rheology Modifier Additive for Water-Based Paints

Borchi® Gel PN is a shear thinning rheology modifier additive for water-based paints. It provides thixotropy in the low shear range.


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Benefits of Shear Thinning Rheology Modifiers

As this rheology modifier additive is shear thinning, it is also known as a strongly pseudoplastic, non-Newtonian fluid, meaning that there is an inverse relationship between its shear rate and viscosity – as viscosity increases, shear rate decreases. Viscosity changes are dependent upon force.

Borchi® Gel PN is a VOC-, APEO- and tin-free organic zirconium complex thickener neutralized with ammonia. Benefits of this shear thinning rheology modifier additive include highly effective storage stability, as well as the prevention of settling and separation of pigments. It also improves viscosity stability after tinting with universal colorants in water-based coatings systems. Concentration levels need to be managed as too high a level can lead to excessive crosslinking, which may cause separation and structure loss. There is no need for biocides when using this product.


Borchi Gel PN shear thinning rheology modifier for coatings prevents paint sedimentation and syneresis

Borchi® Gel PN prevents long-term paint sedimentation and syneresis (photo shows coatings after 2 weeks of storage at 40 ºC)


Using Borchi® Gel PN Rheology Modifier with Inorganic Pigment Dispersants and Cellulosic Thickeners

Due to its rheological properties, Borchi® Gel PN can be used with our Borchi® Gen 1252 wetting and dispersing agent for titanium dioxide pigment dispersions. Benefits of using both products together include the elimination of settling and improved viscosity variance over time after extended heat age stability. They also provide high opacity and strong tint strength in pigments. There is no change in gloss or contrast ratio with the use of these products. Borchi® Gel PN is more effective than fumed silica in TiO2 dispersions.



TiO2 Concentrationshear thinning rheology modifier better than fumed silica for TiO2 dispersions

Viscosity stability is better over time with Borchi® Gel PN for TiO2 dispersions when compared with fumed silica


Borchi® Gel PN can also be used with our Borchi® Gen 1757 wetting and dispersing agent for bismuth vanadate pigment dispersions. Benefits of combining these products include better storage stability and the elimination of settling in bismuth vanadate pigments.

Borchi Gel PN rheology modifier for waterborne paints with bismuth vanadate dispersant better viscosity and stability

Borchi® Gel PN in WB PY 184 dispersion brings anti-settlementation and long-term stabilization of dense inorganic pigments. The viscosity profile does not impact the flow behavior of the pigment concentrate, allowing for higher pigment loading when used in combination with Borchi® Gen 1757


When used with a cellulosic thickener, Borchi® Gel PN builds up shear viscosity and improves sag resistance. It builds a stronger rheological network that is resistant to water and solvent impact. As a shear thinning rheology modifier additive, Borchi® Gel PN has lower spattering tendencies compared to cellulosic thickeners. Its thixotropic profile allows for superior sag resistance and leveling.Borchi Gel PN with cellulosic thickener and TiO2 dispersant

Borchi® Gel PN builds up viscosity and improves sag resistance when used with a cellulosic thickener


Similar Rheology Modifiers

Other rheology modifier additives known for thixotropy in the low shear range from Borchers include Borchi® Gel NA. Borchi® Gel NA is neutralized with sodium hydroxide.Borchi Gel PN shear thinning rheology modifer for waterborne paints prevention of viscosity drop from addition of universal colorants

Shear thinning rheology modifiers for water-based paints like Borchi® Gel PN and Borchi® Gel NA prevent drops in viscosity when adding universal colorants


Increasing Borchi® Gel PN/NA Concentration / Decreasing Resin Concentration

Borchi Gel PN and NA shear thinning rheology modifiers for waterborne paints crosslinking

The level of Borchi® Gel PN or Borchi® Gel NA is important.  Too much can lead to excessive crosslinking, which may cause separation and structure loss



Borchi® Gel PN is ideal for use in architectural and general industrial coating applications.



Click here for sales tool with Borchi® Gen 1252.

Click here for sales tool with Borchi® Gen 1757.

  • Physical Characteristics

    AppearanceClear, colorless to slight yellowish liquid
    Non-volatile contentNA
    Density1.23 g/cm3 DIN 51757
    (20 °C)

  • Features

    • Thixotropic additive for use in water-based coatings systems whose binders or additives contain free hydroxyl and carboxyl groups
    • Strongly psuedoplastic and non-Newtonian rheology modifier
    • Contains shear thinning behavior
    • Develops viscosity in the low shear range to prevent settling and separation
    • Improves viscosity stability after tinting with Universal Colorants in coatings
    • Once applied, the structure rebuilds slowly for improved flow and leveling while retaining good sag resistance
    • VOC-free
    • APEO-free
    • Tin-free

  • Applications

    • Wide range of polymer systems
      • Vinyl acetate
      • Acrylic
      • Styrene acrylic
      • Colloid
      • Surfactant stabilized polymers
    • Coatings
      • Interior
      • Exterior

  • Dosage

    • 0.5 – 2.0% on total paint formulation

    The degree of thixotropy will depend on the type of reactive groups present in the system, the pH of the coating (ideally between 7.5 and 8.5), the level of the desired gel structure and the amount of Borchi® Gel PN used. The exact dosage should be experimentally determined. Borchi® Gel PN can be added to the mill-base or as a post add provided good mixing conditions are used.

  • Storage

    Protect from the effects of weathering and store at temperatures between 5 and 30 °C. Once opened, containers should be
    resealed immediately after each removal of the product.

  • Safety

    Please refer to our safety data sheet for information relating to product safety.

Registration :
  • Europe : EINECS
  • Switzerland : EINECS
  • USA : TSCA
  • Canada : DSL
  • New Zealand : NZIoC
  • China : IECSC
  • Korea : ECL
  • Taiwan : NECI
  • Philippines : PICCS