Photoinitiator TPO for UV Offset Ink
CAS Number: 75980-60-8
Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide (TPO) is a highly efficient Type I acylphosphine oxide photoinitiator for UV-curable offset, flexo, and screen-printing inks, absorbing strongly in the 380–420 nm range where LED and medium-pressure mercury lamps emit. Its excellent through-cure capability, low yellowing, and compatibility with pigmented ink systems make TPO the backbone photoinitiator in modern UV printing inks.
Technical Specifications
| appearance | Light yellow to yellow powder or granules |
| purity (%) | ≥97 |
| moisture (%) | ≤0.3 |
| absorption max (nm) | 295, 380 |
| melting point (°C) | 88–93 |
Applications
- UV-curable offset ink photoinitiator (LED & mercury arc)
- UV flexo ink for food and beverage packaging
- UV screen-printing inks for plastics and metals
- UV digital inkjet ink formulations
- UV overprint varnishes and coatings
Key Features
- Strong absorption at 380–420 nm ideal for LED UV curing
- Excellent through-cure in pigmented and colored ink films
- Low yellowing for use in white and light-colored UV inks
- High initiating efficiency at low loading (1–4%) in ink formulations
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CAS Number
75980-60-8
Category
Printing Ink ChemicalsAvailability
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