Chemical name: Phenylbis(2,4,6-trimethylbenzoyl)phosphine oxide
CAS No.: 162881-26-7
Specification
Items
Standard
Appearance
Light yellow powder
Assay
≥98.5%
Melting range
131-135℃
Applications:
PI 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 andprepregs.
PI 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 IRGACURE 819 allow curing of thick sections.
PI 819 can be used in combination with other photoinitiators such as PI 184 or PI 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,PI 819 can easily be used in combinations with UV absorbers, e.g. TINUVIN 400. It is therefore ideally suited for use in weather-resistant UV curable
coatings.
The amount of PI 819 required for optimum performance should be determined in trials covering a concentration range.