Optical Brighteners - Saner Chemical Technology Co., Ltd

Optical Brighteners

Optical brighteners, fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs) are dyes that absorb light in the UV and violet region (usually 340–370 nm) of the spectrum, and re-emit light in the blue region (typically 420–470 nm). They are often used to enhance the appearance of color of fabric, paper, plastics and coatings causing a “whitening” effect, making materials look less yellow by increasing the overall amount of blue light reflected. Optical brighteners are often used to mask the inherent yellowness of plastics and are used to improve colors and make plastic look whiter and brighter. These are generally added to enhance the esthetics and consumer appeal. Optical brighteners are also often used in conjunction with other colorants to achieve the specific shade as required by the application. Brighteners have high melting point and show good dissolution in molten plastics. Bis-benzoxazolyl-stilbene and bis-benzoxazolyl-thiophene are the two common optical brighteners used in plastics industry.

▍General grades

Product name	CAS No.	Chemical group	Purity	Melting range	Solubility	Appearance	Applications
OB (FBA 184)	7128-64-5	Benzoxazole	≥98%	201-205 ℃	Hardly soluble in water, soluble in alkane, mineral oil, wax and common organic solvents	Light yellow or milky white powder	PVC/PP/PE/PS/ABS/EVA/POM, cellulose acetate fiber, rubber, as well as coatings, paints, printing inks, etc.
OB-1 (FBA 393)	1533-45-5	2,2′-(vinylenedi-p-phenylene) bisbenzoxazole	≥98.5%	355-360 ℃	Insoluble in water, soluble in high boiling point organic solvents		PVC/PS/ABS/PMMA/PC/PA/PET plastics; also suitable for PET/PA/PP fiber
FP 127 (FBA 378)	40470-68-6	2,2'-(1,2-Ethenediyldi-4,1-phenylene) bisbenzoxazole	≥99%	219-221 ℃		Light yellow powder	Very suitable for PVC/PS plastics, and partially suitable for PP/PE/EVA and rubber as well as coatings, printing inks and synthetic fibers
KCB (FBA 367)	5089-22-5	1.4-bis(benziazolyl-2-yl-) naphthalene	≥99%	210-212 ℃	Insoluble in water, soluble in common organic solvents	Yellow green powder	PVC/PP/PS/ABS/PPMA/PC/PA/PU/TPU/TPE films, molded plastics, EVA and rubber as well as synthetic fibers
KSN (FBA 368)	5242-49-9	4.4-bis(5-methyl-2-benzoxazole)-ethylene	≥98%	335-345 ℃		Yellow green powder	polyester, polyamide, polyacrylonitrile fiber; films, injection, extrusion and any stage of polymer processing

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