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2,4,6-trimethylbenzoyldiphenyl phosphine oxide 2021-11-22T03:35:46+00:00

Photoinitiator TPO | CAS 75980-60-8

2,4,6-trimethylbenzoyldiphenyl phosphine oxide CSA 75980-60-8

Photoinitiator TPO Product Information

  • Product Name: 2,4,6-trimethylbenzoyldiphenyl phosphine oxide (TPO)
  • CAS NO.: 75980-60-8
  • EINECS No.: 278-355-8
  • Molecular Formula: C22H21O2P
  • Molecular mass: 348.382 g/mol
  • Other names: Photocure TPO; Photoinitiator-TPO; HRcure-TPO; TPO; SPEEDCURE TPO; YF-PI TPO; IHT-PI TPO; LABOTEST-BB LT00452354; SP-2,4,6; Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide; 2,4,6-Trimethylbenzoyldiphenylphosphine oxide; Diphenyl (2,4,6-trimethylbenzoyl) phosphine oxide; (diphenylphosphoryl)(2,4,6-trimethylphenyl)methanone; Diphenyl(2,4,6-trimethylbenzoyl)-phosphineoxide; (2,4,6-trimethyl benzoyl) diphenyl phosphine oxide; Phosphine oxide, diphenyl(2,4,6-trimethylbenzoyl)-; TMDPO; 75980-60-8; EINECS 278-355-8
  • Key Properties: Low odor, low yellowing, through-curing
  • Packaging: 20 kg carton

As an efficient photoinitiator, the photolysis products of 2,4,6-trimethylbenzoyldiphenyl phosphine oxide (TPO) are three methyl benzoyl free radical and two phenyl phosphonyl free radical, which are both free radicals with high initiating activity. The absorption wavelength of the photodissociation product moves to the short wave, and has the effect of photobleaching, which is beneficial to the ultraviolet light transmission, and can be used for the curing of thick coating. The thermal stability of TPO is excellent. It is heated to 180℃ without chemical reaction and has good storage stability. Although 2,4,6-trimethylbenzoyldiphenyl phosphine oxide (TPO) has its own light yellow, it becomes colorless after photolysis and does not change yellowing.

Product specification of photoinitiator TPO

Physical Properties Standard
 Assay  >99.0%
 Melting Point  91-94°C
 Absorption Peak  273 nm, 370 nm

Photoinitiator TPO uses

Industry Uses: Adhesives and sealant chemicals; paint additives and coating additives; processing aids

Consumer Uses: Paints and coatings

Storage and Transportation

In view of the absorption of TPO in the visible light region, so people should pay attention to avoiding light in the process of production, storage and transportation of  2,4,6-trimethylbenzoyldiphenyl phosphine oxide (TPO).

Safety Statements

S22: Do not breathe dust.

S24/25: Avoid contact with skin and eyes.

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Ideal UV photoinitiator should have the following advantages

  1. Cheap and simple synthesis;
  2. Photoinitiators and their photolysis products shall be non-toxic and tasteless;
  3. Good stability, easy to store for a long time;
  4. The absorption spectrum of photoinitiator must match the emission band of radiation source and have high molar extinction coefficient;
  5. Because most photoinitiators transition to excited singlet and excited triplet after absorbing light energy, the inter system transition efficiency of initiators is higher;
  6. Higher initiation efficiency.



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