Optical brighteners are additives that impart brightness to polymers and intensify the degree of whiteness. These whitening agents absorb light in the UV spectrum and emit light in the blue region of the visible spectrum to yield a brighter and fresher appearance to the plastic. Optical brighteners are used in engineering plastics like thermoplastic polyurethanes, polyvinylchlorides (PVC), styrene homo- and copolymers and polyolefins among others.