PHOTOINITIATOR TPO CAS NO.75980-60-8

Chemical name: Diphenyl(2,4,6-trimethylbenzoyl)phosphine oxide
CAS No.：75980-60-8
Molecular formular：C22H21O2P
Molecular weight：348.37
Molecular structure



Specification
Appearance: Pale yellow crystal powder
Purity, %: ≥99.0 (HPLC)
Melting point，℃：91.0-94.0
Volatility, %: ≤0.2
Acid value (mgKOH/g): ≤0.5


Application
TPO is an efficient free radical photoinitiator with absorption in a long
wavelength range. Its effective absorption peak is 350-400nm and it always
absorbs about 420nm. Its absorption peak is longer than that of the conventional
initiator. After irradiation, two free radicals, benzoyl and phosphatidyl, can be
formed, which can initiate polymerization. It is a photoinitiator for curing
styrene-based unsaturated polyesters and acrylic resins. Its absorption in the
long-wave region of the UV spectrum can fully cure even white paints and surfaces
pigmented with TiO2. Such coatings are characterized by particularly low
yellowing. TPO can also be used to cure clear coatings and is particularly
suitable when low-odor products are desired. Recommended applications: screen inks
white coatings, flexo inks wood coatings, overprint varnishes printing plates
etc.The thermal stability of TPO is excellent. It is heated to 180℃ without
chemical reaction and has good storage stability.
info at hhochem.com

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