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Fluorescent brightener

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1929 P. Krais found that aesculetin can emit fluoresces under ultraviolet light with the fabric, after being immersed in an aqueous solution, obtaining whitening effect. The first commercially available fluorescent brightener was the derivatives of the 4, 4'-bis-triazine stilbene-2, 2'-disulfonic acid developed by the Federal Republic of Germany Bayer company in 1940. Since then, people have further developed a number of fluorescent brightener agents, and thus becoming self-contained series dyes.

Fluorescent brightener is commonly known as "white dye", also known as optical brighteners, briefly called brighteners. It is a colorless organic compound that can stimulate fluorescence under ultraviolet light. Its brightening effect is through the principle of the optically complementary color, making yellowing substances, after subjecting to fluorescent brightener treatment, not only can reflect visible light, but also absorb UV light outside the visible light into visible light of blue/yellow or cyan to be reflected. It is organic matters that can improve the whiteness of the fabrics and paper. Brighteners can absorb the ultraviolet in 330 to 360 nm wavelength with the reflected light being at a blue/violet light of wavelength of 400 to 440 nm, coinciding with the yellow light reflected from the fabric undergoing bleaching but still exhibits yellow color as mutually complementary colors. Therefore, these two colors add with each other and become white so that the fabric becomes white. After the whitening process, due to that there is a portion of ultraviolet light becoming visible light to be reflected out with the total reflection amount increased compared to non-processing fabric, the brightness of the treated fabric also increases, becoming whiter. It can also increase the vividness of the colored fabrics. Fluorescent whitening, being different with chemical bleaching, would not destroy the fabric color and intensity. However, for fabric and paper of darker background, if they undergo direct brightening treatment without bleaching, can’t obtain good results.

The organic compound taken as fluorescent brightening agents should having at least four conjugated double bonds, such as -C = C-C = C -C = C-C = C- or -N = C-C = C- C = N -C = C- in its molecule structure. The common structure of chromophore contains four kinds:
① Stilbene type: such as brighteners VBL. It is mainly used for the brightening of cotton fibers and being taken as the brightening component in advanced synthetic detergent.
② Coumarin type, such as brighteners WS. It has a strong blue fluorescence, being the brighter of polyamide, wool and silk.
③ Azole type; It is mainly for the brightening of wool, polyamide and acrylon.
④ Naphthalimide type: such as APL. It can be applied to the brightening of the polyamide, polyester and PVC.

Brightener is mainly used in textile industry to improve the whiteness of a variety of natural and synthetic fabrics and enhance shine. In recent years, its application in the fields of paper, plastics, leather, soap, synthetic detergent and other daily necessities in is also growing rapidly.

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Structure:
Chemical Name:
Disodium 4,4'-bis(2-sulfostyryl)biphenyl
CAS:
27344-41-8
MF:
C28H20Na2O6S2
Structure:
Chemical Name:
4,4'-Stilbenedicarboxylic acid
CAS:
100-31-2
MF:
C16H12O4
Structure:
Chemical Name:
2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene
CAS:
7128-64-5
MF:
C26H26N2O2S
Structure:
Chemical Name:
4,4'-Bis(5-methyl-2-benzoxazolyl)stilbene
CAS:
2397-00-4
MF:
C30H22N2O2
Structure:
Chemical Name:
Fluorescent Brightener KS-N
CAS:
5242-49-9
MF:
C29H20N2O2
Structure:
Chemical Name:
1-(2-Cyanostyryl)-4-(4-cyanostyryl)benzene
CAS:
13001-38-2
MF:
C24H16N2
Structure:
Chemical Name:
L-(-)-Malic Acid
CAS:
97-67-6
MF:
C4H6O5
Structure:
Chemical Name:
4,4-Bis(diethylphosphonomethyl)biphenyl
CAS:
17919-34-5
MF:
C22H32O6P2
Structure:
Chemical Name:
ACENAPHTHYLENE
CAS:
208-96-8
MF:
C12H8
Structure:
Chemical Name:
Fluorescent Brightener 135
CAS:
1041-00-5
MF:
C18H14N2O2
Structure:
Chemical Name:
2,2'-(1,2-Ethenediyldi-4,1-phenylene)bisbenzoxazole
CAS:
1533-45-5
MF:
C28H18N2O2
Structure:
Chemical Name:
Fluorescent Brightener 367
CAS:
5089-22-5
MF:
C24H14N2O2
Structure:
Chemical Name:
2-Chlorobenzyl cyanide
CAS:
2856-63-5
MF:
C8H6ClN
Structure:
Chemical Name:
Oxazole
CAS:
288-42-6
MF:
C3H3NO
Structure:
Chemical Name:
2-(Chloromethyl)benzonitrile
CAS:
612-13-5
MF:
C8H6ClN
Structure:
Chemical Name:
2,5-Thiophenedicarboxylic acid
CAS:
4282-31-9
MF:
C6H4O4S
Structure:
Chemical Name:
4-tert-Butyl-2-nitrophenol
CAS:
3279-07-0
MF:
C10H13NO3
Structure:
Chemical Name:
FLUORESCENT BRIGHTENER 28
CAS:
4404-43-7
MF:
C40H44N12O10S2
Structure:
Chemical Name:
4-Sulfo-1,8-naphthalic anhydride potassium salt
CAS:
71501-16-1
MF:
C12H5KO6S
Chemical Name:
Fluorescent Brightener 220
CAS:
16470-24-9
MF:
C40H40N12Na4O16S4
Structure:
Chemical Name:
2-tert-Butyl-1,4-benzoquinone
CAS:
3602-55-9
MF:
C10H12O2
Structure:
Chemical Name:
Fluorescent Brightener 185
CAS:
2866-43-5
MF:
C18H10N2O2S
Structure:
Chemical Name:
Fluorescent Brightener 9
CAS:
133-66-4
MF:
C44H34N12Na2O6S2
Chemical Name:
Fluorescent Whitening Agent VBL
Chemical Name:
Fluorescent Brightener BC
MF:
C32H26N12Na2O6S2
Chemical Name:
Fluorescent Brightener BBU
Structure:
Chemical Name:
Fluorescent Brightener 87
CAS:
12768-91-1
MF:
C40H40N12O16S4.4Na
Structure:
Chemical Name:
Fluorescent Brightener 113
CAS:
12768-92-2
MF:
C40H42N12O10S2.2Na
Chemical Name:
Fluorescent Brightener Pf
MF:
C18H14O2N2
Chemical Name:
Fluorescent Brightener 33
CAS:
61902-19-0
Structure:
Chemical Name:
Fluorescent Brightener 210
CAS:
28950-61-0
MF:
C40H36N12Na4O14S4
Chemical Name:
Fluorescent Whitener ER
Structure:
Chemical Name:
Fluorescent Brightener 357
CAS:
41098-56-0
MF:
C40H38N12Na6O18S6
Structure:
Chemical Name:
Fluorescent brightener 71
CAS:
16090-02-1
MF:
C40H38N12Na2O8S2
Structure:
Chemical Name:
Fluorescent brightener 185
CAS:
12224-41-8
MF:
C18H10N2O2S
Structure:
Chemical Name:
Fluorescent brightener 85
CAS:
12224-06-5
MF:
C36H34N12Na2O8S2
Structure:
Chemical Name:
Fluorescent brightener 135
CAS:
12224-12-3
MF:
C18H14N2O2
Structure:
Chemical Name:
C.I. 482200
CAS:
38775-22-3
MF:
C28H22O6S2
Structure:
Chemical Name:
4-Nitronaphthalene-1,8-dicarboxylic anhydride
CAS:
34087-02-0
MF:
C12H5NO5
Chemical Name:
Fluorescent Brightener 191
CAS:
12270-53-0
MF:
C30H20N6Na2O6S2
Chemical Name:
Fluorescent Brightener 204
CAS:
76482-77-4
MF:
C32H26N12Na2O6S2
Structure:
Chemical Name:
Fluorescent brightener 24
CAS:
12224-02-1
MF:
C40H40N12Na4O16S4
Chemical Name:
Fluorescent brightener PF-3
MF:
C18H14N2O2
Structure:
Chemical Name:
Fluorescent Brightener 28
CAS:
4193-55-9
MF:
C40H44N12O10S2.2Na
Structure:
Chemical Name:
Fluorescent brightener 86
CAS:
12224-07-6
MF:
C40H42N12O10S2.2Na
Structure:
Chemical Name:
Fluorescent Brightener ER-III
CAS:
79026-03-2
MF:
C24H16N2
Structure:
Chemical Name:
Fluorescent brightener 378
CAS:
164908-53-6
MF:
C30H26O2
Chemical Name:
Fluorescent brightener BA
Structure:
Chemical Name:
5-BENZOXAZOLOL, 2-METHYL-
CAS:
23997-94-6
MF:
C8H7NO2
Structure:
Chemical Name:
Fluorescent Brightener 264
CAS:
68971-49-3
MF:
C40H38N12Na6O22S6
Chemical Name:
Fluorescent Brightener 353
CAS:
55585-28-9
Structure:
Chemical Name:
Disodium 4,4'-bis[(4-anilino-6-methoxy-1,3,5-triazin-2-yl)amino]stilbene-2,2'-disulphonate
CAS:
3426-43-5
MF:
C34H28N10Na2O8S2
Structure:
Chemical Name:
Fluorescent Brightener 30
CAS:
2606-93-1
MF:
C28H22N4Na2O8S2
Chemical Name:
BRIGHTENERS
Chemical Name:
Fluorescent Brightener
Chemical Name:
Fluorescent brightener CBS
MF:
C28H22O6S2
Chemical Name:
fluorescent whitening agent PRS
MF:
C34H28N10Na2O8S2
Chemical Name:
Fluorescent brightener EB
Structure:
Chemical Name:
MDAC)
CAS:
12224-03-2
MF:
C14H17NO2
Chemical Name:
Fluorescent brightener PRA
Chemical Name:
Fluorescent brightener NT-1
Chemical Name:
Fluorescent brightener A
Chemical Name:
Fluorescent brightener PSD
Structure:
Chemical Name:
Fluorescent Brightener 121
CAS:
2744-49-2
MF:
C15H14ClN3O2S
Chemical Name:
Fluorescent Brightener 119
CAS:
12270-52-9
Chemical Name:
Fluorescent Brightener 54
CAS:
12768-89-7
MF:
C21H16ClN2NaO3S
Structure:
Chemical Name:
sodium 4-[3-(4-chlorophenyl)-4,5-dihydro-5-phenyl-1H-pyrazol-1-yl]benzenesulphonate
CAS:
40691-09-6
MF:
C21H16ClN2NaO3S
Structure:
Chemical Name:
4,4'-bis(3-phenylureido)-2,2'-stilbenedisulphonic acid
CAS:
25738-35-6
MF:
C28H24N4O8S2
Chemical Name:
Fluorescent Whitening Agent EBF
Chemical Name:
Fluorescent Brightener XD
Chemical Name:
Fluorescent brightener PSM
Chemical Name:
Fluorescent brightener APL
Chemical Name:
Fluorescent brightener PB
MF:
C18H10N2O2S
Chemical Name:
Fluorescent Brightener 363
CAS:
95078-19-6
Structure:
Chemical Name:
Fluorescent Brightener 184
CAS:
12224-40-7
MF:
C26H26N2O2S
Chemical Name:
Fluorescent Brightener VBU
MF:
C40H42N12Na4O12S4
Chemical Name:
Fluorescent brightener PMB
Structure:
Chemical Name:
Fluorescent Brightener 251
CAS:
16324-27-9
MF:
C36H32N12Na4O14S4
Chemical Name:
Fluorescent Brightener 263
CAS:
99549-42-5
MF:
C40H38N12Na6O18S6
Structure:
Chemical Name:
Fluorescent brightener 121
CAS:
12224-11-2
MF:
C15H14ClN3O2S
Chemical Name:
fluorescent whitening agent SWN
MF:
C14H17NO2
Chemical Name:
Fluorescent brightener RKH
Chemical Name:
Fluorescent brightener OB-C
Chemical Name:
Fluorescent Brightener DCB
MF:
C15H14ClN2O2S
Chemical Name:
Fluorescent Brightener VBA
MF:
C40H36N12O14S4Na4
Chemical Name:
Fluorescent whitening agent for plastic
Chemical Name:
Fluorescent brightener KB
Chemical Name:
Fluorescent brightener V4BM
Chemical Name:
Fluorescent brightener PSW-201
Chemical Name:
Fluorescent brightener KOB
Chemical Name:
Fluorescent Brightener 1
CAS:
15339-39-6
MF:
Unspecified
Chemical Name:
Fluorescent Brightener BSL
Chemical Name:
Fluorescent Brightener BF
MF:
C1634N12Na2O8S2
Chemical Name:
Fluorescent brightener HDT-1
Chemical Name:
Fluorescent brightener HL
Chemical Name:
Fluorescent brightener PS-1
Chemical Name:
Fluorescent brightener BSU
Chemical Name:
Fluorescent brightener CEF
Chemical Name:
Fluorescent brightener OB-P
Structure:
Chemical Name:
CALCOFLUOR WHITE RWP
CAS:
8066-05-5
MF:
C14H17NNa2O6S