TPO is a highly efficient Free Radical Type I solid photoinitiator which is used to initiate the UV polymerization of styrene-based unsaturated polyesters and acrylic resins. It is particularly suited to use in pigmented coatings, white paints and thick 

film layers requiring low yellowing and low odor.
Synonyms: diphenyl(2,4,6-trimethylbenzoyl)-phosphineoxid;SP-2,4,6;PHOSPHINE OXIDE, DIPHENYL(2,4,6-TRIMETHYLBENZOYL)-;LABOTEST-BB LT00452354;DIPHENYL(2,4,6-TRIMETHYLBENZOYL)PHOSPHINE OXIDE;2,4,6-TRIMETHYLBENZOYLDIPHENYLPHOSPHINE OXIDE;Diphenyl(2,4,6-trimethylbenzoyl);SPEEDCURE TPO 
CAS: 75980-60-8 
MF: C22H21O2P 
MW: 348.37 
EINECS: 278-355-8 
Product Categories: Functional Materials;Photopolymerization Initiators;Miscellaneous;Organic Photoinitiators;Polymerization Initiators