Optical brighteners (OB)
Additives > Optical
| Optical brightener | |
Also called optical correctors or optical brighteners or fluorescent whitening agents, are organic compounds, usually colorless or slightly colored that are dispersed in a polymer matrix, act, converting a portion of the ultraviolet rays in blue-violet light (400 and 500 nm) to cover the eventual beige color of the polymer, or give it some brightness. fluorescent whitening agents (FWA) optical brighteners (OB) 4,4'-bis (benzoxazol-2-yl) stibenne 4,4'-diamino-2,2'-stilbenedisulfonic 2,2 '- (2,5-thiophenediyl) bis (5-tert-butylbenzoxazole) 2.5-Thiophenediylbis (5-tert-butyl-1,3-benzoxazole) 2,2 '- (1,2-ethenediyl) bis (4,1-phenylene) bisbenzoxazole. |  White light UV light |
They consist of organic chemical compounds such as coumarone derivatives, diaminostilbendisulfonic acid, also called coumarona-indene resins. These resins are low molecular weight polymers that are generally obtained from coal tar after fractionation by distillation, from which they are obtained industrially. From the fractional distillation we obtain the indene, of crude formula C9H8 and coumarona, of crude formula C8H6O, which is then heated in the presence of strong acids and catalysts based on polymerized aluminum chloride. The melting temperature of the polymer (161 ° C) is directly proportional to the amount of indene, while the solubility in the oils decreases as the indene increases. Therefore, depending on the amount of indene, different types of polymers can be generated, which are used as plasticizers and dilatants in rubber and plastic compounds. The main polymers used are benzocoumarins and benzoxazoles. |  |
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