company tower banner
Gellner Company Logo
Ottopol 25-50E converts into a low-cost solution polymer for pigment grinding and high-gloss flexo and gravure inks. Belonging to the Ottopol 25 Series, it is specifically designed for use as a grinding and letdown vehicle for water-based rotogravure and flexographic inks. It provides high gloss and excellent press stability. Ink and coating makers will benefit from the versatility of this series as a sole binder or component of high-gloss inks and overlay varnishes. These polymers are derived from the same monomer composition, and the dry resin is identical throughout the series.

Functions: Binder & Resin, Grinding Aid

Chemical Family: Acrylics & Acrylates

Compatible Polymers & Resins: Cellulose & Cellulosics, Polyesters, Polystyrenes (PS), Polyvinyl Chloride (PVC)

Knowde Enhanced TDS

Identification & Functionality

Chemical Family
CASE Ingredients Functions

Features & Benefits

Product Highlights

Superior Printing Qualities

  • Ottopol 25 Series’ unique characteristics impart excellent flow and leveling to inks and coatings, making gravure print quality possible that could only be attained with solvent systems in the past. The viscosity curve of this resin is relatively flat and shows a very low degree of thixotropy. The result is superior printing quality.


Good Pigment Wetting

  • High industry standards are met when Ottopol 25 Series is used as a dispersion stabilizer, or purely for wetting purposes. Optimum color development is achieved with a large variety of pigments.


Excellent Gloss

  • The rheological properties of Ottopol 25 solutions contribute to high gloss, while the use of maximum amounts of alcohol will increase the gloss of this resin.


Excellent Adhesion to Substrates

  • On PVC, Polyester, Polystyrene, and Coated Cellophane, this series of polymers provide excellent adhesion.

Applications & Uses

Coating Type

Ottopol 25-50E must be converted to a solution. Ammonia @ 28% concentration will yield the fastest drying speed. Organic amines will delay the drying process and may be used if applicable. The point of neutralization can be calculated, given the acid number of 130. A varnish containing 30% dry resin will have an approximate viscosity of 4,000 cps (Ottopol 25-30). Higher solids, increased drying speed and lower viscosity can be achieved by substituting Isopropyl Alcohol for water. The resulting viscosity will be 400 cps @ 40% Solids.


30% Solids Base Varnish

Materials Parts by Weight
Ottopol 25-50E 60.0
Water 35.2
Aqua Ammonia 28% 4.8
Total 100


40% Solids Base Varnish

Materials Parts by Weight
Ottopol 25-50E 80.0
Isopropyl Alcohol 14.4
Aqua Ammonia 28% 5.6
Total 100


Procedure: Dilute 25-50E and mix thoroughly before adding ammonia.


Physical Form
Milky white
ValueUnitsTest Method / Conditions
pH6.5 - 7.5--
Solids Content49.0 - 51.0%-
Specific Gravity1.087--
Glass Transition Temperature43°C-
Viscosity 250 - 2000 cps-
Weight / Gallon8.91lbs-

Regulatory & Compliance

Chemical Inventories