UV Photoinitiator TPO – High-Efficiency Free Radical Photoinitiator
UV Photoinitiator TPO (2,4,6-trimethylbenzoyldiphenyl phosphine oxide, CAS 75980-60-8) is a highly efficient free radical photoinitiator designed for UV-curable systems. It features a wide absorption range, fast curing speed, excellent deep curing ability, and outstanding anti-yellowing performance. It is widely used in UV coatings, printing inks, adhesives, optical fiber coatings, and composite materials.
- Wide absorption range: 365nm, 380nm, 400nm, max at ~425nm
- Fast curing speed with dual free radicals (benzoyl & phosphinoyl)
- Excellent deep curing performance for thick films
- Anti-yellowing, low color, low volatility
- Mild odor, eco-friendly formulation
- Good solubility in reactive diluents
- Suitable for water-based and solvent-based UV systems
- Ideal for white pigmented systems
Typical Specifications
- Product Name: 2,4,6-trimethylbenzoyldiphenyl phosphine oxide
- Synonyms: Photoinitiator TPO
- CAS No.: 75980-60-8
- Molecular Formula: C₂₂H₂₁O₂P
- Appearance: Light yellow powder
- Assay: ≥99%
- Melting Point: 90.0–94.0℃
- Volatile Matter: ≤0.5%
- Ash Content: ≤0.1%
Application
UV Curable Coatings
Wood coatings, furniture coatings, plastic coatings, metal coatings, and floor coatings.
UV Printing Inks
Offset ink, screen ink, flexo ink, digital printing ink, and packaging inks.
UV Adhesives & Potting Compounds
Adhesives for optical, electronic, and medical devices.
Optical Fiber & Special Materials
Optical fiber coatings, photopolymerizable polyesters, composite materials, and dental filling materials.
Advantages of Nichwell Photoinitiator TPO
- High purity ≥99% for stable curing efficiency
- Strict quality control ensures batch consistency
- Low volatility and mild odor for safer operation
- Excellent anti-yellowing for white and light-colored systems
- Reliable global supply and fast logistics
- Full technical support for UV formulation
FAQ
Is Photoinitiator TPO suitable for thick film curing?
Yes, its wide absorption and high activity enable excellent deep curing.
Can TPO be used in white UV systems?
Yes, it is especially recommended for white pigmented UV curing systems.
Does TPO cause yellowing?
No, it features excellent anti-yellowing performance.