OMNIRAD TPO

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.
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.

CAS Number: 75980-60-8
Molecular Formula: C22H21O2P
Molecular Weight: 348.37
EINECS Number: 278-355-8

Synonyms: Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide, 2,4,6-trimethylbenzoyl diphenylphosphine oxide, trimethylbenzoyl diphenylphosphine oxide, (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, Diphenyl(2,4,6-trimethylbenzoyl)phosphineoxide, diphenyl (2,4,6-trimethylbenzoyl)phosphine oxide, Diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, diphenyl-(2,4,6-trimethylbenzoyl) phosphine oxide, diphenylphosphoryl-(2,4,6-trimethylphenyl)methanone, (Diphenylphosphinyl)(2,4,6-trimethylphenyl)methanone, Methanone, (diphenylphosphinyl)(2,4,6-trimethylphenyl)-, di(phenyl)phosphoryl-(2,4,6-trimethylphenyl)methanone, (Diphenylphosphoryl)(mesityl)methanone, 2,4,6-Trimethylbenzoyldiphenylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenyl-phosphineoxide, 2,4,6-trimethylbenzoyl-diphenylphosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)phosphorus oxide, Phosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)-, diphenylphosphino[(2,4,6-trimethylphenyl)carbonyl]-1-one, TRIMETHYLBENZOYL DIPHENYLPHOSPHINE OXIDE [INCI], Lucirin TPO solid, CHIVACURE TPO, DOUBLECURE TPO, ADDITOL TPO, GENOCURE TPO, UNII-B9EIM2D97X, EINECS 278-355-8, EC 278-355-8, CAS-75980-60-8, MFCD00192110, DTXSID4052502, DTXCID8031075, RefChem:442966, SCHEMBL27651, CHEMBL3561198, VFHVQBAGLAREND-UHFFFAOYSA-, Tox21_303757, NCGC00357056-01, AKOS015840661, MSK3458, Q27274548, 2,4,6-TRIMETHYLBENZOYLDIPHENYL PHOSPHINE OXIDE TPO;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

Omnirad TPO is a photoinitiator based on diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide that is used to initiate polymerization reactions under ultraviolet and visible light.
Omnirad TPO absorbs light efficiently in the near-UV to violet region and undergoes photochemical cleavage to generate highly reactive radical species.
These radicals rapidly start the curing of acrylate, methacrylate, and unsaturated resin systems.

Omnirad TPO belongs to the phosphine oxide class of photoinitiators, which are known for deep curing performance and high reactivity.
Its molecular structure enables strong light absorption and efficient radical generation even at relatively low light intensities.
This makes Omnirad TPO particularly suitable for thick films and pigmented formulations where light penetration is limited.

Omnirad TPO is widely applied in UV-curable coatings, inks, adhesives, and 3D printing resins.
It enables fast curing, low yellowing, and good surface and through-cure properties in finished materials.
These characteristics make it a preferred photoinitiator in advanced industrial, electronic, and graphic arts applications.

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.
Provides thorough and high speed cure, It 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.
Omnirad TPO G was earlier part of BASF and has been sold off to IGM Resins. 

Omnirad TPO G is a photoinitiator. 
Omnirad TPO applications include stabilized clear UV coatings, fiber glass composites and gel coats.
Omnirad TPO is a highly efficient liquid curing agent to initiate radical polymerization of unsaturated resins after exposure to UV light such as those based on a prepolymer – e.g., acrylates and unsaturated polyesters – in combination with mono- or multifunctional monomers as reactive thinners. 

Omnirad TPO is well suitable for formulations in which Omnirad TPO is used. 
Omnirad TPO provides all the handling advantages of a liquid product. 
In thicker coatings Omnirad TPO offers improved bottom curing compared with that of Omnirad TPO. 

Omnirad TPO is especially suitable for white-pigmented formulations with minimal yellowing after curing and for coatings with low pigment volume concentration.
Therefore Omnirad TPO can be offered in almost all applications as a one-to-one replacement for Omnirad TPO with certain advantages.
Omnirad TPO is particularly effective in systems requiring deep and uniform curing through the entire material thickness.

Its absorption profile allows activation not only by traditional UV lamps but also by modern LED light sources emitting in the 385–420 nm range.
This compatibility supports its use in energy-efficient and low-heat curing technologies.
The compound exhibits low yellowing tendency after curing compared to many traditional photoinitiators.

This property is critical for applications where optical clarity, color stability, or aesthetic quality is important.
As a result, it is frequently selected for clear coatings, optical components, and high-quality printed materials.
In advanced manufacturing, Omnirad TPO plays an important role in additive manufacturing and stereolithography processes.

Omnirad TPO enables precise layer-by-layer curing with good resolution and mechanical integrity.
These features make it a key component in high-performance UV-curable resin systems for prototyping and functional parts.

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: 0 Pa at 25 °C
Refractive index: n20/D 1.475 (lit.)
Flash point: >230 °F
Storage temperature: sealed in dry conditions, room temperature
Solubility: soluble in methanol
Form: powder to crystal
Color: light yellow to yellow to green
Water solubility: 3.4 mg/L at 20 °C
λmax: 400 nm (DMF) (lit.)
Stability: stable, incompatible with strong oxidizing agents
Cosmetics ingredients functions: nail sculpting
InChIKey: VFHVQBAGLAREND-UHFFFAOYSA-N
LogP: 3.1 at 23 °C

Omnirad TPO provides excellent curing efficiency due to its high quantum yield for radical formation.
This allows rapid polymerization even when used at relatively low concentrations in resin formulations.
As a result, it supports energy-efficient curing processes and reduced processing times.

The photoinitiator shows good compatibility with a wide range of monomers and oligomers.
It can be incorporated into clear, pigmented, and filled systems without significant loss of activity.
This versatility makes Omnirad TPO suitable for diverse formulation requirements across multiple industries.

Omnirad TPO is also valued for its low volatility and good storage stability.
It maintains performance during long-term storage and repeated exposure to light-controlled environments.
These properties contribute to consistent product quality and reliable curing performance in industrial use.

Omnirad TPO Resins is a highly efficient, low yellowing, type I photoinitiator used to initiate radical polymerization of unsaturated oligomers such as acrylates, after exposure to UV light.
It can be used in combination with mono or multi-functional monomers as reactive diluents.
Omnirad TPO can be used as the sole initiator or in combination with other photoinitiators such as alpha hydroxyl ketones.

Omnirad TPO is suitable for surface, through and LED cure.
It is applicable for clear, white, pigmented and water-based systems.
Omnirad TPO is designed for UV radiation curing systems.

Omnirad TPO is used in paper, wood, metal, plastics, glass coatings and inks.
The recommended addition level is 0.3-3% by weight of formulation.
Omnirad TPO is a highly efficient liquid curing agent to initiate radical polymerization of unsaturated resins after exposure to UV light such as those based on a prepolymer – e.g., acrylates and unsaturated polyesters – in combination with mono- or multifunctional monomers as reactive thinners.

It is well suitable for formulations in which Omnirad TPO is used. 
Omnirad TPO provides all the handling advantages of a liquid product. 
In thicker coatings Omnirad TPO offers improved bottom curing compared with that of Omnirad TPO.

Omnirad TPO is especially suitable for white-pigmented formulations with minimal yellowing after curing and for coatings with low pigment volume concentration.
Therefore Omnirad TPO can be offered in almost all applications as a one-to-one replacement for Omnirad TPO with certain advantages.

Omnirad TPO is a highly efficient, low yellowing, type I photoinitiator used to initiate radical polymerization of unsaturated oligomers such as acrylates, after exposure to UV light.
It can be used in combination with mono or multi-functional monomers as reactive diluents. 
Omnirad TPO is used in coatings.

Uses Of Omnirad TPO:
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). 
It 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 used in clear and pigmented UV-curable varnishes to achieve uniform curing and high optical quality.
It supports deep curing even in formulations containing pigments or fillers that normally limit light penetration.
This makes it suitable for protective and decorative finishes with consistent appearance.

The photoinitiator is also applied in electronic materials such as photoresists, insulating coatings, and encapsulation systems.
It enables precise curing with minimal thermal stress on sensitive electronic components.
These properties are important for maintaining performance and reliability in electronic devices.

In industrial composite and fiber-reinforced systems, Omnirad TPO is used to initiate curing of UV-reactive resin matrices.
It allows controlled polymerization and improved mechanical properties of the final composite.
This application supports lightweight, high-strength materials used in advanced engineering and manufacturing.

Omnirad TPO is a photo initiator, used in many kinds of ink industries
Omnirad TPO is widely used in UV-curable coatings to achieve fast and efficient polymerization under UV or LED light sources.
It enables rapid surface and through-cure, resulting in hard, durable, and chemically resistant coating films.

These properties are essential for industrial wood, plastic, metal, and electronic coatings.
The compound is extensively applied in UV-curable inks for printing technologies such as inkjet, flexographic, and screen printing.
It ensures high curing speed, strong adhesion to substrates, and minimal yellowing of printed images.

This makes it suitable for high-quality packaging, labels, and graphic arts applications.
Omnirad TPO is also used in UV-curable adhesives and 3D printing resins.
It provides precise curing control, good mechanical strength, and dimensional accuracy in bonded or printed parts.

These characteristics are critical in electronics assembly, medical devices, and additive manufacturing processes.
Omnirad TPO is used in UV-curable sealants to provide rapid curing and strong sealing performance.
It enables efficient crosslinking that results in good elasticity, adhesion, and chemical resistance.

These properties are important for sealing applications in construction, electronics, and automotive components.
The photoinitiator is also applied in medical and dental UV-curable materials such as coatings, adhesives, and resins.
It supports controlled curing with low heat generation and reduced discoloration.

This makes it suitable for applications where precision, safety, and material stability are critical.
In optical and specialty materials, Omnirad TPO is used to cure transparent resins and functional layers.

Omnirad TPO ensures high clarity, minimal yellowing, and uniform polymerization throughout the material.
These features are essential for lenses, optical films, and high-performance specialty coatings.

Safety Profile Of Omnirad TPO:
Omnirad TPO may cause skin and eye irritation upon direct or prolonged contact.
Exposure can result in redness, itching, or discomfort, particularly when handling powders or concentrated formulations.
Protective gloves and eye protection are recommended during use and handling.

Inhalation of dust or aerosols may irritate the respiratory tract.
Symptoms can include coughing or throat discomfort, especially in poorly ventilated environments.
Adequate ventilation and dust control measures should be applied in industrial settings.

Omnirad TPO is generally considered to have low acute toxicity but may pose risks with long-term or repeated exposure.
It may be harmful to aquatic organisms if released into the environment due to persistence and chemical activity.
Proper disposal, spill control, and compliance with environmental regulations are important to minimize environmental impact.