Description
Synonyms: Photoinitiator 819, Irgacure 819, Omnirad 819, Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide, BAPO
CAS No.: 162881-26-7
Molecular formula: C26H27O3P
Purity: 99%
Photoinitiator 819 is a versatile photoinitiator for radical polymerisation of
unsaturated resins upon UV light exposure. It is especially suited for
white pigmented formulations, the curing of glass fiber reinforced
polyester/styrene systems and for clearcoats for outdoor use in
combinations with light stabilizers. Thick section curing is also possible
with this photoinitiator.
Applications:
Photoinitiator 819 may be used, after adequate testing, in UV curable
formulations for clear and for pigmented coatings on wood, metal,
plastic, paper and optical fibers as well as for printing inks and
prepregs.
Photoinitiator 819 exhibits at low concentrations an outstanding curing
performance in highly opaque white and colored furniture coatings or
screen inks containing rutile titanium dioxide or colored pigments and
affords minimum yellowing after exposure to sufficient amounts of UV
radiation. Additionally the outstanding absorption properties of
Photoinitiator 819 allow curing of thick sections.
Photoinitiator 819 can be used in combination with other photoinitiators
such as Photoinitiator 184 or Photoinitiator 651. With the latter it is especially
suited to cure polyester/styrene resins as used for glass reinforced
materials.
Due to its photosensitivity at longer wavelengths, Photoinitiator 819 can
easily be used in combinations with UV absorbers. It
is therefore ideally suited for use in weather-resistant UV curable
coatings.
The amount of Photoinitiator 819 required for optimum performance
should be determined in trials covering a concentration range.
Recommended dosage:
Clear acrylic and unsaturated polyester/styrene coatings 0.1 – 0.2% Photoinitiator 819 1 – 2% Photoinitiator 184
White acrylic and unsaturated polyester/styrene coatings 0.5 – 1% Photoinitiator 819 1 – 2% Photoinitiator 184
Colored acrylic formula 0.5 – 1% Photoinitiator 819 1 – 2% Photoinitiator 184
White Screen Printing Ink 0.5 – 1.5% Photoinitiator 819 1 – 2% Photoinitiator 184
Glass fiber reinforced unsaturated polyester/styrene prepreg 0.1 – 0.2% Photoinitiator 819
