Product Description
Optical Brightener OB (C.I. 184) is a high-purity light green powder (≥99%) used to enhance the whiteness and brightness of plastics, resins, coatings, and inks. Chemically known as 2,5-Thiophenediylbis(5-tert-butyl-1,3-benzoxazole), it is non-toxic, tasteless, and highly soluble in organic solvents such as alkanes, fats, mineral oil, paraffin, and most other organic media. Its maximum absorption occurs at 375 nm in ethanol, ensuring effective optical brightening.
Advantages
- Enhances whiteness and brightness in thermoplastics and coatings
- High purity (≥99%) ensures consistent results
- Non-toxic and tasteless, safe for industrial use
- Soluble in most organic solvents including alkanes, fats, and mineral oils
- Stable thermal performance (196–202 °C) with low moisture content
Applications
Optical Brightener OB (C.I. 184) is widely used in:
- Thermoplastics: PVC, PE, PP, ABS, PS
- Resins: Unsaturated resin, epoxy, and other polymer blends
- Paints & Coatings: Oil-soluble coatings for plastics and metal surfaces
- Printing Inks: Enhances visual whiteness and brightness in colored inks
Physical & Chemical Properties
| Property | Specification |
|---|---|
| Chemical Name | 2,5-Thiophenediylbis(5-tert-butyl-1,3-benzoxazole) |
| C.I. Number | 184 |
| CAS Number | 7128-64-5 |
| EC Number | 230-426-4 |
| Appearance | Light green powder |
| Purity | ≥99% |
| Melting Point | 196–202 °C |
| Moisture Content | <0.5% |
| Solubility | Soluble in alkanes, fat, mineral oil, paraffin, most organic solvents |
| Maximum Absorption | 375 nm (in ethanol) |
Packaging
- 20 kg per carton
- 25/30 kg per fiber drum with PE liner
- Custom packaging available per customer requirements
Why Choose Optical Brightener OB (C.I. 184)?
✅ Superior Whitening Effect: Enhances brightness in plastics, resins, inks, and coatings
✅ High Purity & Stability: Consistent performance in high-temperature processes
✅ Versatile Solubility: Easily disperses in a wide range of organic solvents
✅ Safe & Non-Toxic: Industrial-grade, tasteless, and environmentally safe
✅ Custom Packaging: Flexible options for industrial use
