Fortified Rosin Ester Size
Fortified rosin ester size is an enhanced rosin-based sizing agent produced by reacting natural rosin with maleic anhydride or fumaric acid, increasing the acid value and improving sizing efficiency compared to plain rosin. Available as anionic or cationic emulsions, it provides superior water resistance, printability, and sizing uniformity at reduced dosage. Fortified rosin sizes are used in both acidic and slightly acidic papermaking conditions.
Technical Specifications
| pH | 7.0–9.5 |
| appearance | White to cream emulsion |
| solid content (%) | 50±2 |
| particle size (μm) | < 2.0 |
| acid value (mg KOH/g) | 180–250 |
Applications
- Acidic and slightly acid internal sizing of printing paper
- Newsprint and offset paper sizing
- Corrugated medium and liner board sizing
- Tissue paper water resistance
- Specialty acid pH paper applications
Key Features
- Higher acid value than plain rosin for improved sizing efficiency
- Reduced alum requirement compared to non-fortified rosin sizes
- Better stability and shelf life than conventional rosin emulsions
- Compatible with cationic starch and other wet-end chemicals
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