907 is an α-aminoketone Type I photoinitiator exhibiting very strong UV-A absorption (λmax 330–385 nm). Upon irradiation it undergoes α-cleavage to generate both benzoyl and amine-alkyl radicals, giving rapid, low-odour, low-yellowing cure of pigmented or clear UV-LED/mercury-lamp systems. The product is practically insoluble in water (≈ 2 mg L⁻¹ at 20 °C), freely soluble in acrylic monomers, chloroform, acetone and toluene, and can be recrystallised from ethanol. Commercial material is supplied at ≥ 99 % purity and remains stable for ≥ 2 years when stored sealed at < 25 °C away from light .
Key Physicochemical Data:
Melting point: 73–76 °C
Density: 1.2 g cm⁻³ (20 °C, predicted)
Flash point: 208 °C (predicted)
Log P (octanol/water): 3.0 (predicted)
Vapour pressure: < 0.1 mmHg at 25 °C
Typical Uses:
High-performance Type I photoinitiator for UV-LED or mercury-lamp curing of offset, flexo and screen inks, pigmented coatings, solder-mask inks and photoresists at 2–6 % w/w; especially suited for thick-section or highly coloured (black/red) formulations .
Synergist with benzophenone, 184 or TPO for low-yellowing, low-odour UV-curable systems in food-contact and cosmetic packaging .
Building block for UV-patternable dielectrics and optical wave-guide materials due to its excellent through-cure and low migration .
Quality Specification (Commercial Grade):
Purity (HPLC): ≥ 99 %
Water content (KF): ≤ 0.3 %
Loss on drying: ≤ 0.5 %
Ash: ≤ 0.1 %
Transmittance: 425 nm ≥ 92 %, 500 nm ≥ 96 %
Heavy metals: ≤ 20 ppm
Hazard Statement:
Harmful to aquatic life with long-lasting effects (H413); causes skin and eye irritation (H315 + H319). Avoid release to the environment; use gloves, goggles and adequate ventilation. Store in a cool, dry place away from oxidants and light. SDS available on request.
