Fluorescent brightener OB (C.I.184) Chemical name: 2.5-bis(5-tert-butyl-2-benzoxazolyl)thiophene CAS Number: ¡¡ 7128-64-5 Molecular formula: C26H26SO2N2 Technical conditions: Appearance: Bright yellow crystal powder Melting point: 198-201¡æ Content: 99.0% Use: It is used in thermoplastic plastics. PVC, PE, PP, PS, ABS, SAN, SB, CA, PA, PMMA, acrylic resin. polyester fiber paint, coating the brightening of printing ink. 25kg/fiber drum.