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Omnirad TPO is a highly efficient, low yellowing, Type I photoinitiator used to initiate radical polymerization of unsaturated oligomers e.g. acrylates, after exposure to UV light.
Omnirad TPO can be used in combination with mono or multi-functional monomers as reactive diluents.
Omnirad TPO is a monoacylphosphine oxide based photoinitiator that can be incorporated in a variety of polymeric matrixes for efficient curing and color stability of the resin.
CAS: 75980-60-8
MF: C22H21O2P
MW: 348.37
EINECS: 278-355-8
Synonyms
Diphenyl(2,4,6-trimethylbenzoyl);SPEEDCURE TPO;Diphenyl-(2,4,6-Trimethylbenzolyl)-Phosphine Oxide(SP-2,4,6);YF-PI TPO;2,4,6-TRIMETHYLBENZOYLDI PHENYLPHOSPHINOXIDE;diphenyl(2,4,6-trimethylbenzoyl)phosphine;IHT-PI TPO;Diphenyl(2,4,6-trimethylbenzoyl)phosphinoxid
Omnirad TPO is a highly efficient, low yellowing, free-radical type 1 photoinitiator.
Used to initiate radical polymerization of unsaturated oligomers like acrylates, after exposure to UV light.
Omnirad TPO, with the CAS number 75980-60-8, is an organic compound commonly used as a photoinitiator in UV-curable systems.
Omnirad TPO features a phosphine oxide functional group, which is crucial for its ability to generate free radicals upon exposure to UV light, facilitating polymerization processes.
Omnirad TPO is characterized by its high thermal stability and efficiency in initiating polymerization reactions, making it valuable in coatings, adhesives, and inks.
Omnirad TPO's structure includes a central phosphorus atom bonded to two phenyl groups and a trimethylbenzoyl moiety, contributing to its photochemical properties.
The presence of the trimethyl groups enhances solubility and reactivity.
Additionally, Omnirad TPO is typically colorless to pale yellow and exhibits low volatility, which is advantageous in various applications.
Safety considerations include handling it with care, as Omnirad TPO may cause irritation upon contact with skin or eyes.
Overall, Omnirad TPO is a significant compound in the field of polymer chemistry and materials science.
Omnirad TPO Chemical Properties
Melting point: 88-92 °C(lit.)
Boiling point: 519.6±60.0 °C(Predicted)
density: 1.12 g/mL at 25 °C(lit.)
vapor pressure: 0Pa at 25℃
refractive index: n20/D 1.475(lit.)
Fp: >230 °F
storage temp.: Sealed in dry,Room Temperature
solubility: soluble in Methanol
form: powder to crystal
color: Light yellow to Yellow to Green
Water Solubility: 3.4mg/L at 20℃
λmax: 400nm(DMF)(lit.)
Stability: Stable. Incompatible with strong oxidizing agents.
Cosmetics Ingredients Functions: NAIL SCULPTING
InChI: 1S/C22H21O2P/c1-16-14-17(2)21(18(3)15-16)22(23)25(24,19-10-6-4-7-11-19)20-12-8-5-9-13-20/h4-15H,1-3H3
InChIKey: VFHVQBAGLAREND-UHFFFAOYSA-N
LogP: 3.1 at 23℃
CAS DataBase Reference: 75980-60-8(CAS DataBase Reference)
EPA Substance Registry System: Omnirad TPO (75980-60-8)
Uses
Omnirad TPO can be used in the photo-crosslinking of PMMA composite, which can further be used as a gate insulator in organic thin film transistors (OTFTs).
Omnirad TPO can also be used in the formation of UV curable urethane-acrylate coatings.
Omnirad TPO may also be used in the photoinduced reaction for the formation of organophosphine compounds, which potentially find their usage as ligands with metal catalysts and reagents.
Omnirad TPO is a photo initiator, used in many kinds of ink industries.
Provides through and high speed cure.
Omnirad TPO is suitable for use in adhesives.
Omnirad TPO can be used in combination with mono or multi-functional monomers as reactive diluents.
Omnirad TPO is recommended for use in graphic arts.
Synthesis
The general procedure for the synthesis of the photoinitiator Omnirad TPO from 2,4,6-trimethylbenzaldehyde and diphenylphosphine oxide is as follows: 37.61 g of 2,4,6-trimethylbenzaldehyde and 56.17 g of diphenylphosphine oxide were added to a three-necked flask containing 450 ml of methylene chloride, and mixed with stirring.
After 6 hours of reaction, the reaction system was cooled in a low temperature water bath to 810°C.
Subsequently, 0.2925 g of ammonium metavanadate (NH4VO3) and 37 ml of 30% H2O2 were added and reacted at low temperature for 0.5 hours.
After that, the reaction mixture was moved to room temperature conditions to continue the reaction for 5 hours.
Upon completion of the reaction, 5% aqueous Na2S2O3 was added to the reaction solution to neutralize the unreacted H2O2.
Next, an extraction operation was carried out and the organic layer was collected and washed three times with saturated brine.
After dehydration by adding anhydrous sodium sulfate, the product was purified by recrystallization.
Finally, Omnirad TPO was collected by filtration and dried to give a light yellow powdery solid, the TPO product, in 98% yield.
