Photoinitiator 784 is an efficient visible light photoinitiator with an absorption range of 400-480 nanometers and an absorption peak at 460 nanometers. It has good thermal stability and high curing efficiency, and is particularly suitable for the curing of imaging or information storage photosensitive resins.
The photoinitiation process of photoinitiator 784 is neither a decomposition type nor a hydrogen-withdrawing type. Instead, after absorbing light energy, it undergoes photoisomerization to a cyclic base photoreaction intermediate (A) and reacts with the oligomer and the active diluent's acrylate ester carbonyl group to undergo ligand substitution, generating free radicals (B), initiating polymerization and cross-linking.
Photoinitiator 784 has excellent thermal stability, with a thermal decomposition temperature of 230℃. It has excellent absorption performance in the visible light region, has a bleaching effect after photolysis, and can cure coatings with a thickness of 70 micrometers or more.
| Photoinitiator | Main Absorption Peaks (nm) | Absorption Range | Light Source Compatibility | Key Advantage |
|---|---|---|---|---|
| Photoinitiator 784 | 400, 480 | Up to ~500 nm | UV + Visible light (especially blue light) | Deep curing, photobleaching, visible-light response |
| Omnirad 369 | 232, 323 | < 350 nm | UV (Hg lamps, UV-LED 365 nm) | Fast surface cure, high reactivity |
| Omnirad 819 | 237, 275, 380 | Up to ~420 nm | UV + near-LED (385–405 nm) | Strong through-cure, especially in white systems |
Melting Point | 165-170℃ |
Purity | ≥99% |
Loss On Drying | ≤0.2% |
Density | 1.12g/cm3 |
Flash point | ≥300℃ |
Absorption wavelength | 398nm,460nm,520nm |
25KG cartons
Note: The data contained here are based on our current knowledge and experience. It is the responsibility of user to test our products before the final application.
Photoinitiator 784 responds to both visible light and UV light. Its reported absorption peaks at 400 nm and 480 nm, and the absorption can extend up to 500 nm, which is why it is often used in visible-light-curing and UV-curing systems.
Yes. The technical data sheet states that it shows photobleaching properties and can be used in both clear and pigmented systems.
