Coated Calcium Carbonate
Coated calcium carbonate (CaCO₃) is a modified form of ground or precipitated calcium carbonate where the particle surfaces are treated with hydrophobic agents (e.g., stearic acid, silanes, or titanates). This coating improves compatibility with organic systems, such as solvent-based, UV-curable, and plastisol inks, while maintaining benefits like opacity and cost efficiency.
Key Characteristics of Coated CaCO₃:
1. Surface Treatment
- Common Coatings:
- Stearic acid (most widely used for inks, plastics, and rubber).
- Silane coupling agents (improves bonding in polymer-based inks).
- Titanates & zirconates (enhances dispersion in high-performance inks).
- Coating Level: Typically 1–3% by weight.
2. Particle Size & Morphology
- Ultra-fine grades: 0.5–2 µm (PCC is smoother, GCC is slightly coarser).
- Nano-coated CaCO₃: <100 nm (for high-end ink applications).
3. Hydrophobicity
- Repels water, improving dispersibility in non-aqueous systems (solvent, oil, UV inks).
- Reduces moisture absorption, preventing ink clumping or viscosity changes.
4. Enhanced Mechanical Properties
- Improves abrasion resistance in printed films.
- Reduces settling in storage.
Advantages Over Uncoated CaCO₃
✔ Better dispersion in organic solvents & resins (reduces agglomeration).
✔ Higher compatibility with polymers (e.g., PVC, acrylics, polyurethanes).
✔ Improved ink stability (less moisture sensitivity).
✔ Enhanced print durability (abrasion/scratch resistance).
5- 20 Micron
Product range
96 %
Whiteness
96 %
Brightness