Photoinitiator TPO (Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide)
CAS Number: 75980-60-8
Photoinitiator TPO is an acylphosphine oxide Type I photoinitiator with strong absorption in the 350–420 nm range, making it the primary choice for UV-LED curing at 365 nm, 385 nm, and 405 nm. Its deep yellow color photobleaches upon irradiation, enabling effective cure in thick sections. TPO provides excellent deep-cure capability in clear oligomer systems and is commonly dosed at 0.5–3 phr.
Technical Specifications
| Purity | ≥97% (HPLC) |
| Appearance | Light yellow to yellow powder |
| Melting Point | 91–95 °C |
| Molecular Weight | 348.4 g/mol |
| Absorption Maximum | 295 nm, 368 nm, 393 nm |
Applications
- UV-LED curable coatings at 365/385/405 nm
- 3D printing resins (SLA, DLP)
- Dental composites and adhesives
- Thick-section clear UV potting compounds
- UV-curable flexographic inks
Key Features
- Photoinitiator TPO absorbs efficiently at 365–405 nm for UV-LED process compatibility
- Photobleaching eliminates residual color in cured clear films
- Outstanding deep-cure performance in thick and gel-type UV systems
- High molar absorptivity means low dosage requirements (0.5–3 phr)
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CAS Number
75980-60-8
Category
Radiation Curing ChemicalsAvailability
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