Diphenyl(2,4,6-trimethylbenzoyl)phosphine Oxide丨CAS 75980-60-8

1. UV-Curable Systems and Coatings
Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide丨CAS 75980-60-8 is widely used as a high-performance photoinitiator in UV-curable formulations due to its excellent efficiency under long-wavelength UV or visible light.
●Inkjet and Screen Printing Inks:
TPO enables rapid curing of pigmented and clear inks in printing applications on paper, plastic, glass, and metal.
●UV Coatings:
Utilized in automotive, optical, flooring, and wood finishes for its non-yellowing properties and deep-curing capabilities, particularly in white or colored coatings.
●Overprint Varnishes and Adhesives:
It provides fast surface and through-cure in thin films and lamination adhesives for packaging.
2. 3D Printing and Stereolithography (SLA/DLP)
Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide丨CAS 75980-60-8 is highly effective in photopolymer resins used in 3D printing, especially for SLA and digital light processing (DLP) systems:
●Allows precise layer curing and improved mechanical strength
●Effective under low-energy LED light sources (365–405 nm)
●Compatible with high-resolution printing applications
3. Optical Fiber and Electronics
●Photoresists and Microelectronics:
Used in the photo-patterning of microelectronic materials and coatings in the semiconductor industry.
●Encapsulation of LEDs:
Due to its low volatility, optical clarity, and photostability, TPO is suitable for UV-cured encapsulants and adhesives used in LED manufacturing.
4. Dental Materials
●TPO is employed in dental composites and adhesives to provide rapid polymerization during UV or blue light curing. It offers:
oLow color development
oHigh mechanical strength
oCompatibility with visible light-curing units

1. High Photoinitiating Efficiency
●Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide丨CAS 75980-60-8 exhibits excellent reactivity, especially under visible light (UV-A or near UV), making it a preferred photoinitiator in LED-curable formulations.
●Provides deep and uniform cure even in pigmented or thick layers.
2. Low Yellowing and High Stability
●Compared to other aromatic photoinitiators, TPO results in minimal yellowing, making it ideal for transparent or white coatings and optical applications.
3. Broad Wavelength Absorption
●TPO's absorption in the 350–420 nm range allows flexibility across different light sources, including LED, UV fluorescent, and mercury vapor lamps.
4. Compatibility with Other Photoinitiators
●It can be blended with Type I or Type II photoinitiators to optimize cure speed, depth, and surface tack, depending on formulation needs.
5. Low Migration and Volatility
●With its relatively high molecular weight and low volatility, TPO reduces the risk of migration in food packaging and other sensitive applications.

Conclusion
Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide丨CAS 75980-60-8 is a highly efficient, broad-spectrum photoinitiator that has become a staple in UV-curable technologies, particularly where low yellowing, deep curing, and LED compatibility are required. From industrial coatings and adhesives to 3D printing resins and dental materials, TPO continues to expand its value across multiple high-performance and precision applications.