Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region (usually 340-370 nm) of the electromagnetic spectrum, and re-emit light in the blue region (typically 420-470 nm) by fluorescence. These additives are often used to enhance the appearance of color of fabric and paper, causing a “whitening” effect; they make intrinsically yellow/orange materials look less so, by compensating the deficit in blue and purple light reflected by the material, with the blue and purple optical emission of the fluorophore.
Leako S.A, BSB, BBU:
Optical brighteners, optical brightening agents (OBAs), fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), are chemical compounds that absorb light in the ultraviolet and violet region.
These additives are often used to enhance the appearance of color of fabric and paper, causing a “whitening” effect.
Leakofore® BSB 2000 Powder
Universally applicable fluorescent brightener for cellulosic fibers and particularly suitable for application on the padding machine in the continuous bleaching process and finishing liquors Leakofore BSB 2000 is a fluorescent brightener for cellulosic fibers and their blends with synthetic fibers. Leakofore BSB produces brilliant whitening effects with blue shade and good light and wet fastness properties. Leakofore BSB is distinguished by its low substantively, good stability to peroxide and compatibility with the products used in finishing white goods. It is therefore particularly suitable for brightening woven and knitted goods by the padding process, for application in the continuous bleach, in filling and handle finishes, as well as in resin finishes with metal salt catalysts. Leakofore BSB possesses an excellent leveling power which also facilitates brightening by the exhaust process and in the peroxide bleach on machines where work is carried out with a short liquor ratio.
Optical Brightening Agents(BBU)
LEAKOFORE SA POWDER
– APPEARANCE Bright Yellow Powder
– IONIC CHARACTER Anionic
– SOLUBILITY Good (100 g/L at 20°C)
– pH value of SOLUTION 0.1 % solution-about 7
10.0 % solution-about 9
Stability of Solutions:
– to Hard Water Good
– to Synthetic Resin Catalysts Good
– to Alkalis Good
– to Acids Good
– LEAKOFORE SA is not suitable for simultaneous application in hypochlorite or chlorite bleaching.
LEAKOFORE SA is a brightener with low substantivity and therefore possesses good leveling power, which makes it particularly suitable for application by padding methods. The buildup of LEAKOFORE SA is promoted by the addition of salt.
– Padding Process: The Liquor is made up with:
0.1 – 2 g/L LEAKOFORE SA
– Exhaustion Process: 0.1 – 1.0 % LEAKOFORE SA
(Depending on the degree of whiteness required)
The optimum temperature range for application is 40-70°C.
Drying is carried out on hot cylinders or hot air stenters at 100-120°C.
NOTE: LEAKOFORE SA can be applied in combination with Starches, Softeners Resins etc.
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