Optical Brightening Agent VBL (Stilbene-Type OBA)
CAS Number: 4404-43-7
Optical brightening agent VBL is a stilbene-type fluorescent whitening agent with strong affinity for cellulose fibers, making it particularly effective when applied at the paper wet end or size press. It provides significant brightness and whiteness improvement to paper and textile substrates. VBL offers excellent color fastness to light and is compatible with both acidic and alkaline papermaking conditions.
Technical Specifications
| appearance | Yellow-green fine powder |
| purity (%) | ≥ 98 |
| moisture content (%) | ≤ 5 |
| lambda max emission (nm) | 432–438 |
| lambda max absorption (nm) | 347–352 |
Applications
- Wet-end optical brightening of printing and writing paper
- Size press whitening for coated paper base
- Textile fabric whitening and brightening
- Detergent and cleaning product brightening agent
- Plastic and film whitening applications
Key Features
- High cellulose affinity for strong on-fiber substantivity
- Broad compatibility with acidic and alkaline papermaking
- Significant whiteness gain even at low dosage
- Good light fastness and resistance to yellowing
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