Optical brighteners are added to many materials to reduce yellowing, improve whiteness, and to enhance the brightness of a prod

Optical brighteners function by absorbing ultraviolet radiation and remitting blue light. Theemitted blue light will reduce the yellow color of a polymer. In the presence of a whiteningagent, such as TiO2, the use of OB-1 will produce a brilliant white or “white than white”appearance.Two primary factors affect the whiteness/yellowness of a formulation. They are the color of thebase polymer and the level of brightener added. If no whitening agent, such as TiO2, is used,the level of OB-1 required will likely be lower than when a whitening agent is preset. This levelmight be as little as 25-50 ppm. In determining the optimum concentration of brightener, theeffect of any other UV-absorbing materials in the plastic should be considered. It is importantthat users perform sufficient evaluations to determine the optimum level of OB-1 for theirspecific end uses.

Ash %: 0.3maxEmpirical Formula: C28H18N2O2Melting Point(DTA),C: 353-359Appearance: Yellowish Green PowderOdor: Free of odorVolatile Content %: 0.3maxAssay %: 99minParticle Size: 200 meshes

Optical Brightening Agent OB-1