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 OPTICAL BRIGHTENING AGENTS
 
 

OPTICAL BRIGHTENING AGENTS

 

 

 

 

 

PRODUCTS

EQUI BRAND NAME IN EUROPE

C. I. NOS

 

 

 

OBA - 24

Uvitex 2B  ciba

40650

OBA - 251

Uvitex 2BT Liquid  ciba

40650

OBA - 86/ 113

Uvitex BHT/UP - OBA -252 ciba

40622

 

Blankophor BA - OBA -113 Bayer

--

 

Leucophor BSB -OBA -230 Clariant

--

 

Leucophor AP Clariant

--

OBA - 90

Uvitex CF  Ciba

40619

 

Leucophor PC - OBA -134 Clariant

--

OBA - 220

Blankophor BBU (liq) Bayer

40623

 

Tinopal ABP - X (liq) Ciba

--

 

Leucophor SI Liq Clariant

--

OBA - 290

Leucophor BMB

40623

OBA - 264

Blankophor BSU  Bayer

--

OBA - 357

Leucophor BCR - OBA - 289 Clariant

--

 

Uvitex MST - OBA - 353 Ciba

--

 

Tonopal SCP - OBA - 357 Ciba

--

OBA - 71 / 339

Tonopal DMS Conc  Ciba

40625

 

Photine CBUS (Hickson & Welch

--

OBA - 263

Blankophor  BRU

--

Optical brighteners

Optical brightening agents (OBAs), fluorescent brightening agents (FBAs) or fluorescent whitening agents (FWAs) are dyes that absorb light in the ultraviolet and violet region (usually 340-370nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470nm). Fluorescent activity is a shortterm or rapid emission response, unlike phosphorescence, which is a delayed emission. These additives are often used to enhance the appearance of color of fabric and paper, causing a perceived "whitening" effect, making materials look less yellow by increasing the overall amount of blue light reflected.

The most common class of chemicals with this property are the stilbenes and fluorescent dyes such as umbelliferone, which absorb energy in the UV portion of the spectrum and re-emit it in the blue portion of the visible spectrum. A white surface treated with an optical brightener emits more visible light than shines on it, making it appear brighter. The blue light emitted by the brightener hides yellow and brown tones, making treated materials appear whiter.

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