Photoinitiator TPO

High-Efficiency UV Photoinitiator for Deep Curing & Low Yellowing Systems

Photoinitiator TPO is an efficient free radical photoinitiator. The photolysis products are highly initiating-active trimethylbenzoyl radicals and diphenylphosphoryl radicals. The absorption range is 350-420 nanometers, with the absorption peak at 380 nanometers. It can achieve both surface and deep curing. It has high activity, low odor, no yellowing, low volatility, good thermal stability, and high curing efficiency. It is suitable for initiating the polymerization reaction of unsaturated prepolymer systems, especially for white coatings and thick film coatings. When used in combination with photoinitiator α-hydroxy ketone, the synergistic effect is significant. For example, 4265 (50% TPO/50% 1173). The general dosage is 1-5%.

Key Advantage:

Compared to traditional photoinitiators, TPO offers significantly improved curing depth and minimal yellowing, making it ideal for high-end coatings and 3D printing resins.

Key Features & Benefits

• Excellent deep curing performance for thick coatings
• Low yellowing – ideal for white and clear systems
• High reactivity under LED UV light
• Suitable for pigmented formulations
• Good compatibility with various oligomers and monomers

Applications

• UV coatings (wood, plastic, paper)
• UV inks (offset, flexo, screen printing)
• Adhesives and sealants
• 3D printing resins (SLA/DLP)
• Electronics and optical materials

Why Choose Our TPO?

Unlike generic market products, our Photoinitiator TPO is optimized for modern LED curing systems and high-performance industrial applications:

• Consistent batch-to-batch quality
• Enhanced light absorption efficiency
• Lower odor and improved storage stability
• Custom particle size options available

Technical Specifications

• CAS No.:75980-60-8
• Chemical Name:2,4, 6-trimethylbenzoyl-diphenylphosphine oxide
• Molecular Formula:C22H21O2P
• Molecular Weight: 348.4
• Other Name:Lucirin TPO
• Appearance: Pale yellow crystalline powder

Package: 

25KG cartons

Storage and Transportation:

• Keep container tightly closed and dry and storage in cool place.
• Attention should be paid to avoiding light during production, manufacturing, storage and transportation.