UV Absorbers
UV Absorber UV-234
2-(2H-Benzotriazol-2-yl)-4,6-bis(1-methyl-1-phenylethyl)phenol
Low volatility and high-heat stability — the benzotriazole of choice for engineering plastics and fibers.
Product Description
UV-234 is a high-molecular-weight benzotriazole UV absorber. Its dual α-cumyl substituents deliver strong 300–400 nm absorption with extremely low volatility and excellent heat-migration resistance, surviving processing temperatures close to 300 °C in PC and PBT.
UV-234 is compatible with most polymers and especially suited to thin articles with high surface-to-volume ratio such as films and fibers — no blooming from migration or precipitation. In polycarbonate it suppresses yellowing and light-transmission loss; in polyester and polyurethane fibers it protects strength and color fastness.
Typical loadings are 0.15–0.5 wt%. Aolong UV-234 is ≥99.0% assay and pairs with HALS such as UV-944 and UV-119 to build complete weathering systems for engineering plastics.
Key Features
- Very low volatility — survives high-temperature processing
- Strong 300–400 nm absorption
- No blooming in films and fibers
- Synergy when compounded with HALS
Applications
- Polycarbonate sheet, film and moldings
- PBT, PET and polyester fibers
- Polyamide and PPO engineering plastics
- TPU and spandex fibers
- High-temperature powder and coil coatings
Specifications
| CAS No. | 70321-86-7 |
|---|---|
| Molecular Formula | C30H29N3O |
| Molecular Weight | 447.58 |
| Appearance | Pale yellow powder |
| Assay (HPLC) | ≥ 99.0% |
| Melting Point | 137 – 141 °C |
| Loss on Drying | ≤ 0.5% |
Packaging & Storage
25 kg fiber drum with PE liner or 25 kg carton. Store cool, dry and protected from light; shelf life 24 months in original sealed packaging.
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UV Absorbers
UV Absorber UV-360
2,2'-Methylenebis[6-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol]
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