Additol TPO 2,4,6-Trimethylbenzoyl diphenylphosphine oxide 75980-60-8 Cytec Surface Specialties North America South and Central America Crosslinking / Coupling / Curing Agents Photoinitiator Acrylic/Acrylate Resins Polyester >> Unsaturated Vinyl Coatings >> UV / Radiation Curing Inks >> UV / Radiation-curable Pigment concentrates INKS >> Screen inks INKS >> Lithographic and Offset Inks INKS >> Flexographic inks Additol TPO is 2,4,6-trimethylbenzoyl diphenylphosphine oxide. Additol TPO is a radical photoinitiator that can be used alone or in cmbination with other photoinitiators. It is used in formulations containing unsaturated materials such as acrylates, methacrylates, vinyls and unsaturated polyesters. With exposure to UV light, Additol TPO undergoes a photochemical reaction that generates radicals. These radicals will initiate polymerisation through the unsaturated groups present in the system. Additol TPO, due to its photo-bleaching properties is particularly suited for the UV curing of white pigmented formulations and thick clear coatings. It is frequently combined with other alpha cleavage photoinitiators such as Additol CPK and Additol HDMAP for improved surface cure. PERFORMANCE HIGHLIGHTS Additol TPO is characterised by: Low odor Low volatility UV curable formulated products containing it are characterised by: Low yellowing on UV cure Increased depth of cure The final properties of UV cured products also depend on the selection of other components such as oligomers, reactive diluents and additives. SUGGESTED APPLICATIONS: It is typically used at levels of 0.5-2% by weight based on the reactive components of the formulation. Applications include: Screen inks, particularly white Pigmented coatings, particularly white Thick clear coatings White offset inks White flexographic inks 2,4,6-Trimethylbenzoyl diphenylphosphine oxide. Exhibits low odor, volatility and increased depth of cure. Used in screen, offset and flexographic inks and pigmented coatings.