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    Photoinitiator TPO | CAS 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

    Key Properties: Low odor, low yellowing


    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.


    Usually 1-5% is used ration for polimerization. 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                               >98.0%

    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; light-transmissive fiber coating; wood coating

    Consumer Uses: Paints and coatings in mainly white systems, printer inks, silk printer inks, lithographic printer ink; dental fillings


    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.


    We can pack the product in different size sacks or bags from 5 to 20 kg and deliver via vehicular, railway or waterway transport on palettes or loaded into containers based on the agreement with the prospect customer.