OB
Optical brightener OB is widely used in the whitening of various plastics, and oil-based paint coatings with excellent heat resistance and light stability. It has a high sublimation fastness and sunlight and other weather fastnesses.
Key Features
Technical Specifications
| C.I. NO. | C.I. 184 |
| CAS Number | 7128-64-5 |
| Appearance | Light yellow powder |
| Purity | 99.80% |
| Melting Point | 201.1-202.2°C |
| Volatility | 0.24% |
| Molecular Formula | C26H26N2O2S |
Physical Data & Fastness Properties
| Ash | 0.03% |
| Max Absorption Wavelength | 375nm (in ethanol) |
| Max Emission Wavelength | 435nm (in ethanol) |
| Heat Resistance | Excellent |
| Light Fastness | Excellent |
| Weather Fastness | Excellent |
Applications
- PVC (polyvinyl chloride)
- Polystyrene (PS)
- Polyethylene (PE)
- Polypropylene (PP)
- ABS plastics
- Cellulose acetate fiber
- Oil-based paints and coatings
- Printing inks
Usage Instructions
PVC: White 0.01-0.05%, Transparent 0.0001-0.001%. PS: White 0.01-0.05%, Transparent 0.0001-0.001%. ABS: Natural 0.01-0.05%, Transparent 0.0001-0.001%. PE/PP: White 0.005-0.05%, Transparent 0.0005-0.005%. Oil-based Paint/coatings/inks: White 0.01-0.02% (10-20g/100kg resins), Transparent 0.0001-0.001%. When using any UV absorb additive, the dosage of OB should be adjusted.
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