Fluorescent brightener 184

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  • Identifiers

    CAS number
    7128-64-5

    Molecular formula
    C26H26N2O2S

    SMILES
    CC(C)(C)C1=CC2=C(C=C1)OC(=N2)C3=CC=C(S3)C4=NC5=C(O4)C=CC(=C5)C(C)(C)C

    Safety labels

  • Odor profile

    Fragrance
    Fruity 57.91%
    Green 42.3%
    Earthy 40.37%
    Animal 30.79%
    Floral 28.23%
    Burnt 28.09%
    Fatty 26.89%
    Roasted 26.05%
    Vetiver 25.38%
    Woody 24.71%

     

    Flavor
    Bitter 51.66%
    Earth 24.11%
    Musty 23.49%
    Earthy 21.11%
    Carrot 20.96%
    Green pepper 20.52%
    Syrup 19.83%
    Tomato leaf 19.22%
    Pepper 19.22%
    Soybean 19.02%

     

    Odor impact est.
    Medium

  • Properties

    XLogP3-AA
    8.0

    pKa est.
    5.72 (weak acid)

    Molecular weight
    430.6 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Ultra slow

    Boiling point est.
    944°C

    Flash point

    • 253.31 ˚C est.

  • Synonyms

    • 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene
    • FLUORESCENT BRIGHTENER 184
    • Benzoxazole, 2,2'-(2,5-thiophenediyl)bis[5-(1,1-dimethylethyl)-
    • 5-tert-butyl-2-[5-(5-tert-butyl-1,3-benzoxazol-2-yl)thiophen-2-yl]-1,3-benzoxazole
    • NSC 158163
    • EINECS 230-426-4
    • Benzoxazole, 2,2'-(2,5-thiophenediyl)bis(5-tert-butyl-
    • Bis(tert-butyl benzoxazolyl) thiophene
    • W7UR9129GP
    • BRIGHTENER OB
    • TINOPAL OB
    • 2,5-Thiophenediylbis(5-tert-butyl-1,3-benzoxazole)
    • UVITEX 3BSA
    • 2,2'-(2,5-Thiophenediyl)bis(5-tert-butylbenzoxazole)
    • KEYFLUOR WHITE PL
    • 2,5-Di(5-tert-butylbenzoxazol-2-yl)thiophene
    • 2,5-Bis(5'-tert-butyl-2-benzoxazolyl)thiophene
    • NSC-158163
    • C.I. Fluorescent Brightening Agent 184
    • EC 230-426-4
    • Benzoxazole, 2,2'-(2,5-thiophenediyl)bis(5-(1,1-dimethylethyl)-
    • bis(t-butyl benzoxazolyl) thiophene
    • CI 515245
    • C.I. 515245
    • C.I. FLUORESCENT BRIGHTENER 184BENZOXAZOLE
    • 2,2'-(2,5-Thiophenediyl)bis[5-tert-butylbenzoxazole]
    • 2,2'-(2,5-THIOPHENEDIYL)BIS(5-(1,1-DIMETHYLETHYL))BENZOXAZOLE
    • BENZOXAZOLE, 2,2'-(2,5-THIOPHENEDIYL)BIS(5-(1,1-DIMETHYLETHYL))-
    • 5-tert-butyl-2-(5-(5-tert-butyl-1,3-benzoxazol-2-yl)thiophen-2-yl)-1,3-benzoxazole
    • RefChem:599379
    • BIS(T-BUTYL BENZOXAZOLYL) THIOPHENE [INCI]
    • 7128-64-5
    • BBOT
    • 2,5-Bis(5-(tert-butyl)benzo[d]oxazol-2-yl)thiophene
    • Uvitex OB
    • 12224-40-7
    • Uvitex 2B
    • BBOT 150
    • C26H26N2O2S
    • 2,5-Bis(5-tert-butylbenzoxazol-2-yl)thiophene
    • 52232-33-4
    • MFCD00005774
    • 2,5-bis-(5-tert-Butyl-2-benzoxazolyl)thiophene
    • 2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene
    • BBOT;OB-FBA 184
    • 2,5-Bis(5-tert-butylbenzooxazol-2-yl)thiophene
    • 2,5-Bis(5-(tert-butyl)benzo-[d]oxazol-2-yl)thiophene
    • 2,2'-thiene-2,5-diylbis(5-tert-butyl-1,3-benzoxazole)
    • 2,2'-(2,5-Thiophenediyl)bis[5-(1,1-dimethylethyl)benzoxazole]
    • 2,5-bis[5-(tert-butyl)benzoxazol-2-yl]thiophene
    • Fluorescent Brightener 362
    • UNII-W7UR9129GP
    • 2,5-Bis(5-t-butylbenzoxazol-2-yl)thiophene
    • BBOT [MI]
    • CBDivE_008000
    • BIDD:GT0727
    • SCHEMBL264177
    • 2,5-Bis-(5-tert-butyl-2-benzoxazol-2-yl)thiophene
    • 2,5-Bis[5-(tert-butyl)-1,3-benzoxazol-2-yl]thiophene
    • DTXSID1048205
    • SCHEMBL29357328
    • CHEBI:211245
    • C.I. Fluorescent Brightener 362
    • 2,2'-(2,5-Thiophenediyl) bis[5-(1,1-dimethylethyl)-benzoxazole
    • 2,2'-(2,5-Thienediyl)bis[5-(2-methyl-2-propanyl)-1,3-benzoxazole]
    • AC7899
    • NSC158163
    • SBB056792
    • STK386365
    • AKOS005221640
    • 4,4'-Bis(2-di(2-hydroxyethyl)amino-4-(3-sulphophenylamino)-1,3,5-triazine-6-ylamino)stilbene-2,2'-disulphonic acid
    • AC-10399
    • AS-14172
    • BP-30128
    • SY048602
    • B1554
    • B4221
    • CS-0010140
    • CS-0168851
    • NS00006430
    • ST45022169
    • 2,5-bis(5-t-butyl-benzoxazol-2-yl)thiophene
    • 2,5-bis(5-tertbutyl-2-benzoxazolyl)thiophene
    • 2,5-Bis-2(5-tert-butylbenzoxazolyl)thiophene
    • 2,5-Bis(5-tert-butylbenzoxazoyl)-2-thiophene
    • 2,5-Thiophenediyl)bis[5-tert-butylbenzoxazole]
    • 28B645
    • 2,5-bis(5-tert-butyl-2-benzoxazolyl) thiophene
    • A934173
    • F600669
    • Benzoxazole,2'-(2,5-thiophenediyl)bis[5-tert-butyl-
    • Q26840908
    • 2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene (BBOT)
    • 2,2'-(2,5-Thienediyl)bis(5-tert-butyl-1,3-benzoxazole)
    • 2,2'-(Thiophene-2,5-diyl)bis(5-tert-butyl-1,3-benzoxazole)
    • Benzoxazole,2'-(2,5-thiophenediyl)bis[5-(1,1-dimethylethyl)-
    • 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene (purified by sublimation)
    • 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene(purifiedbysublimation)
    • 2,5-Bis(5-tert-butyl-benzoxazol-2-yl)thiophene, suitable for scintillation, 99%
    • 5-tert-Butyl-2-[5-(5-tert-butyl-1,3-benzoxazol-2-yl)-2-thienyl]-1,3-benzoxazole #
    • 7128-64-5

  • Applications

    Fluorescent brightener 184 (CAS 7128-64-5) is used as an optical brightening agent across multiple industrial applications: brightening and whitening of fibers and fabrics in textile processing; boosting brightness of paper and board products; serving as a whitening additive for plastics and polymers in materials such as polyolefins and PET; enhancing brightness in coatings and printing inks; and acting as an optical brightener in laundry detergents and other household cleaning products. Subject to local regulations and formulation limits, its use and performance may vary by application.

    gpt-5-nano

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 1.74
    methanol 1.18
    isopropanol 0.88
    water 0.01
    ethyl acetate 6.13
    n-propanol 1.9
    acetone 4.24
    n-butanol 1.93
    acetonitrile 1.57
    DMF 15.31
    toluene 4.76
    isobutanol 1.33
    1,4-dioxane 9.46
    methyl acetate 6.89
    THF 40.86
    2-butanone 8.91
    n-pentanol 2.31
    sec-butanol 1.79
    n-hexane 0.23
    ethylene glycol 0.39
    NMP 26.63
    cyclohexane 0.18
    DMSO 6.41
    n-butyl acetate 7.98
    n-octanol 2.81
    chloroform 73.0
    n-propyl acetate 7.56
    acetic acid 3.89
    dichloromethane 52.81
    cyclohexanone 11.67
    propylene glycol 0.99
    isopropyl acetate 5.73
    DMAc 31.27
    2-ethoxyethanol 7.24
    isopentanol 1.78
    n-heptane 0.3
    ethyl formate 3.79
    1,2-dichloroethane 15.41
    n-hexanol 2.31
    2-methoxyethanol 7.73
    isobutyl acetate 6.77
    tetrachloromethane 1.72
    n-pentyl acetate 11.04
    transcutol 33.75
    n-heptanol 2.69
    ethylbenzene 3.0
    MIBK 5.27
    2-propoxyethanol 11.65
    tert-butanol 0.93
    MTBE 3.35
    2-butoxyethanol 9.84
    propionic acid 3.31
    o-xylene 2.02
    formic acid 1.63
    diethyl ether 3.05
    m-xylene 2.59
    p-xylene 3.99
    chlorobenzene 10.19
    dimethyl carbonate 5.67
    n-octane 0.22
    formamide 3.17
    cyclopentanone 23.18
    2-pentanone 6.88
    anisole 10.55
    cyclopentyl methyl ether 9.77
    gamma-butyrolactone 25.71
    1-methoxy-2-propanol 7.91
    pyridine 20.82
    3-pentanone 5.87
    furfural 27.18
    n-dodecane 0.19
    diethylene glycol 4.23
    diisopropyl ether 1.05
    tert-amyl alcohol 2.06
    acetylacetone 10.2
    n-hexadecane 0.23
    acetophenone 11.91
    methyl propionate 8.05
    isopentyl acetate 8.78
    trichloroethylene 69.3
    n-nonanol 3.31
    cyclohexanol 1.78
    benzyl alcohol 6.35
    2-ethylhexanol 2.49
    isooctanol 2.7
    dipropyl ether 4.44
    1,2-dichlorobenzene 10.84
    ethyl lactate 4.72
    propylene carbonate 13.13
    n-methylformamide 5.52
    2-pentanol 1.53
    n-pentane 0.17
    1-propoxy-2-propanol 9.37
    1-methoxy-2-propyl acetate 14.9
    2-(2-methoxypropoxy) propanol 15.25
    mesitylene 1.12
    ε-caprolactone 15.91
    p-cymene 2.05
    epichlorohydrin 55.53
    1,1,1-trichloroethane 10.53
    2-aminoethanol 1.13
    morpholine-4-carbaldehyde 28.33
    sulfolane 28.09
    2,2,4-trimethylpentane 0.2
    2-methyltetrahydrofuran 16.1
    n-hexyl acetate 11.19
    isooctane 0.11
    2-(2-butoxyethoxy)ethanol 16.24
    sec-butyl acetate 6.66
    tert-butyl acetate 6.61
    decalin 0.28
    glycerin 2.01
    diglyme 28.16
    acrylic acid 4.03
    isopropyl myristate 4.57
    n-butyric acid 5.14
    acetyl acetate 4.12
    di(2-ethylhexyl) phthalate 6.43
    ethyl propionate 7.25
    nitromethane 11.03
    1,2-diethoxyethane 12.22
    benzonitrile 5.65
    trioctyl phosphate 3.53
    1-bromopropane 7.66
    gamma-valerolactone 43.08
    n-decanol 2.32
    triethyl phosphate 4.26
    4-methyl-2-pentanol 1.37
    propionitrile 2.38
    vinylene carbonate 14.43
    1,1,2-trichlorotrifluoroethane 29.2
    DMS 10.54
    cumene 2.11
    2-octanol 2.32
    2-hexanone 8.28
    octyl acetate 5.9
    limonene 2.32
    1,2-dimethoxyethane 15.03
    ethyl orthosilicate 4.56
    tributyl phosphate 4.53
    diacetone alcohol 7.5
    N,N-dimethylaniline 7.87
    acrylonitrile 4.19
    aniline 5.18
    1,3-propanediol 1.88
    bromobenzene 11.98
    dibromomethane 22.72
    1,1,2,2-tetrachloroethane 40.84
    2-methyl-cyclohexyl acetate 8.25
    tetrabutyl urea 7.54
    diisobutyl methanol 1.47
    2-phenylethanol 7.69
    styrene 3.9
    dioctyl adipate 8.69
    dimethyl sulfate 10.33
    ethyl butyrate 6.78
    methyl lactate 5.65
    butyl lactate 9.27
    diethyl carbonate 4.38
    propanediol butyl ether 7.84
    triethyl orthoformate 6.82
    p-tert-butyltoluene 2.0
    methyl 4-tert-butylbenzoate 14.46
    morpholine 13.21
    tert-butylamine 0.52
    n-dodecanol 1.62
    dimethoxymethane 13.94
    ethylene carbonate 8.14
    cyrene 17.68
    2-ethoxyethyl acetate 18.9
    2-ethylhexyl acetate 7.87
    1,2,4-trichlorobenzene 16.29
    4-methylpyridine 15.02
    dibutyl ether 5.1
    2,6-dimethyl-4-heptanol 1.47
    DEF 9.8
    dimethyl isosorbide 36.43
    tetrachloroethylene 17.54
    eugenol 15.39
    triacetin 14.96
    span 80 12.43
    1,4-butanediol 0.99
    1,1-dichloroethane 11.48
    2-methyl-1-pentanol 2.91
    methyl formate 4.86
    2-methyl-1-butanol 2.22
    n-decane 0.37
    butyronitrile 2.43
    3,7-dimethyl-1-octanol 2.91
    1-chlorooctane 2.61
    1-chlorotetradecane 0.85
    n-nonane 0.31
    undecane 0.25
    tert-butylcyclohexane 0.3
    cyclooctane 0.11
    cyclopentanol 2.77
    tetrahydropyran 7.81
    tert-amyl methyl ether 4.43
    2,5,8-trioxanonane 20.44
    1-hexene 1.47
    2-isopropoxyethanol 6.27
    2,2,2-trifluoroethanol 1.88
    methyl butyrate 9.31

    Scent© AI

1 4

IFRA standard 51

Recommendation
No restriction
Maximum acceptable concentrations in the finished product (%)
Category 1
Products applied to the lips
 No restriction Category 7A
Rinse-off products applied to the hair with some hand contact
 No restriction
Category 2
Products applied to the axillae
 No restriction Category 7B
Leave-on products applied to the hair with some hand contact
 No restriction
Category 3
Products applied to the face/body using fingertips
 No restriction Category 8
Products with significant anogenital exposure
 No restriction
Category 4
Products related to fine fragrance
 No restriction Category 9
Products with body and hand exposure, primarily rinse off
 No restriction
Category 5A
Body lotion products applied to the body using the hands (palms), primarily leave on
 No restriction Category 10A
Household care products with mostly hand contact
 No restriction
Category 5B
Face moisturizer products applied to the face using the hands (palms), primarily leave on
 No restriction Category 10B
Household care products with mostly hand contact, including aerosol/spray products (with potential leave-on skin contact)
 No restriction
Category 5C
Hand cream products applied to the hands using the hands (palms), primarily leave on
 No restriction Category 11A
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate without UV exposure
 No restriction
Category 5D
Baby Creams, baby Oils and baby talc
 No restriction Category 11B
Products with intended skin contact but minimal transfer of fragrance to skin from inert substrate with potential UV exposure
 No restriction
Category 6
Products with oral and lip exposure
 No restriction Category 12
Products not intended for direct skin contact, minimal or insignificant transfer to skin
 No restriction