Hydrophobic Surface Sizing Agent
Hydrophobic surface sizing agents are polymer-based formulations applied at the size press or film press to impart water repellency and liquid resistance to paper and board surfaces. They are based on styrene-acrylate, styrene-maleic anhydride, or polyurethane emulsion chemistry, providing superior water resistance, Cobb values, and grease resistance compared to starch-only sizing. These agents are essential for packaging, liquid-contact, and food-grade paper applications.
Technical Specifications
| pH | 5.0–8.0 |
| appearance | White to milky emulsion |
| solid content (%) | 25±2 |
| Cobb value improvement | 50–80% reduction |
| viscosity (mPa·s, 25°C) | 50–300 |
Applications
- Surface sizing of packaging board for liquid resistance
- Food-grade paper and grease-barrier coatings
- Corrugated liner and medium water resistance upgrade
- Release paper and silicone base coat substrate treatment
- Industrial specialty paper liquid-repellent surface treatment
Key Features
- Strong film-forming hydrophobicity on paper surface
- Significantly lower Cobb values than starch-only surface sizing
- Compatible with starch solutions for co-application at size press
- Applicable to food-contact paper with appropriate grade selection
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