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By certification 
FLUORESCENT BRIGHTENER KCB
C.I.367 CAS：5099-22-5
STRUCTURE:
CHEMICAL NAME: 2,2'-(1,4-Naphthalenediyl) bisbenzoxazole
MOLECULAR FORMULA: C26H26N2O2S
MOLECULAR WEIGHT: 430.2 (As International relative Atom Mass 1997)
Max UV ABSORPTION WAVELENGTH: 375 nm (ethanol)
Max OPTICAL EMISSION WAVELENGTH: 435 nm
EXCUTIVE STANDARD: Q/LQH009-2003
SPECIFICATIONS:
| Item | Indices |
Appearance |
yellowish crystalline powder |
Purity |
≥ 99.0% |
Melting point |
210-212℃ |
Ash |
≤ 0.5％ |
Volatile content |
≤ 0.1％ |
PROPERTIES:
Optical brightener KCB is a kind of benzoxazole compound and owns strong whitening effect and its colour shade is brilliant blue glaze. It is insoluble in water and the solubility in the 100 mL solvents as follow: 1.02 g (toluene), 0.8 g (carbon tetrachloride), 0.17g (acetone), 0.76 g (dimethylformamide).
It is mainly used to whiten synthetic fiber and plastics and can be added at any stage in the process of whitening the polymers and make the finished products emitt a bright bluish white glaze. It can also be used as special marks in identify fakless material if used in printing ink.
DIRECTION FOR USAGE:
Thoroughly and uniformly dispersed in all those polymers, and the effect of using concentrated master batch of optical brightener KCB is better.
DOSAGE:
Usually 0.01%-0.03%. The optimal dosage of optical brightener KCB should be adjusted according to the actual requirements.
PACKAGE: Packaged in iron drum or cardboard barrels. Net weight is 25 kg or 50 kg each.
STORAGE: Should be stored in cool and dry place.
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