Used primarily as a photoinitiator in UV-curable systems, this compound plays a key role in polymer chemistry. It is especially effective in free radical polymerization of acrylates and methacrylates upon exposure to ultraviolet light. Commonly found in coatings, inks, and adhesives, it enables rapid curing with low residual odor and good surface finish. Its bulky aromatic structure provides high stability and reduces oxygen inhibition during curing, making it suitable for clear coats and thin films. Also used in 3D printing resins where efficient initiation and minimal yellowing are important.