Optical Brightener for Polyester is a fluorescent whitening agent specially developed for polyester fibers, polyester fabrics, PET plastics, and polyester blends. It absorbs ultraviolet light and emits visible blue-violet light, making polyester materials appear brighter, whiter, and more vibrant. The most commonly used material is a stilbene or benzoxazole-based fluorescent compound with excellent heat resistance and light fastness.
Typical Specifications of High-Quality Optical Brightener for Polyester
| Item | Specification |
|---|---|
| Appearance | Yellow-green powder |
| Purity | ≥99% |
| Melting Point | 350-360°C |
| UV Absorption | 370-380 nm |
| Light Fastness | Grade 7-8 |
| Heat Resistance | Up to 300°C |
| Application | Polyester fiber, PET, films, plastics |
Advantages
Excellent whitening and brightening effect
High temperature resistance during polyester processing
Superior dispersion and compatibility
Long-lasting brightness with minimal yellowing
Suitable for fibers, films, and injection-molded PET products
Competitive Analysis
Compared with traditional whitening agents for cotton or nylon, polyester optical brighteners provide better thermal stability and stronger fluorescence under high-temperature processing conditions. They outperform standard OB-1 alternatives in brightness retention and weather resistance.
Recommended Dosage
Polyester fiber spinning: 100-300 ppm
PET sheet and film production: 200-500 ppm
Injection molding: 0.02%-0.05% of resin weight
Proper dosage depends on the desired whiteness level and processing conditions. Excessive addition may reduce transparency or create a slight bluish appearance.
