Hydroxyethyl Starch (Coating Grade)
Hydroxyethyl starch is an etherified starch produced by reacting native starch with ethylene oxide, resulting in improved cold-water solubility, lower retrogradation tendency, and better film clarity. It is used in paper coating formulations as a co-binder and rheology modifier, providing excellent film formation and pigment binding in high-speed coating operations.
Technical Specifications
| appearance | White to off-white powder |
| pH (5% solution) | 5.5–8.0 |
| moisture content (%) | ≤ 13 |
| degree of substitution (MS) | 0.05–0.15 |
| viscosity (10% solution, 50°C, mPa·s) | 20–150 |
Applications
- Co-binder in high-speed pigment coating operations
- Surface sizing for offset and digital printing grades
- Smoothness and gloss improvement in coated papers
- Binder in specialty coatings for inkjet paper
- Film-former for barrier coatings on packaging paper
Key Features
- Reduced retrogradation compared to native and oxidized starch
- Better cold-water solubility for easier processing
- Clearer film and lower haze in coated paper applications
- Stable viscosity over broad temperature range
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