Bisbenzoxazole type organic derivative based optical brightening additive masterbatch containing effective substance in polyolefin carrier resin. This masterbatch is added in polymers to reduce the yellowing effect giving improved brightness and enhanced whiteness to the product. It absorbs the ultraviolet radiation and re-emits the blue light. It shows compatibility with LLDPE, HDPE, PP, SAN/ABS and PS/HIPS polymer system.