alpha-METHYL STYRENE

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  • Identifiers

    CAS number
    98-83-9

    Molecular formula
    C9H10

    SMILES
    CC(=C)C1=CC=CC=C1

    Safety labels

    Flammable
    Flammable

    Irritant
    Irritant

    Environmental Hazard
    Environmental

  • Odor profile

    Herbal 69.11%
    Spicy 52.44%
    Terpenic 47.27%
    Citrus 43.52%
    Phenolic 41.48%
    Lemon 38.13%
    Sweet 35.45%
    Musty 34.02%
    Nutty 33.92%
    Medicinal 33.62%

    Scent© AI

    Odor threshold>

    • Odor Threshold Low: 0.05 [mmHg]. Odor Threshold High: 0.16 [mmHg]. Odor threshold (detection at 0.052 ppm and recognition at 0.16 ppm) from CHEMINFO
    • Odor detection in air, 5.20X10-2 ppm (purity not specified)
    • Odor recognition in air, 1.60X10-1 ppm (purity not specified)
    • Odor (low) 0.2496 mg/cu m; Odor (high) 960.0 mg/cu m; Irritating concn 960.0 mg/cu m.

  • Properties

    XLogP3-AA
    3.5

    Molecular weight
    118.18 g/mol

    Vapor pressure est.

    • hPa @ 20°C
    • hPa @ 25°C

    Evaporation rate
    Very fast

    Melting point expt.

    • -9 °F (NTP, 1992)
    • -23.2 °C
    • -23 °C
    • -10 °F

    Boiling point

    • 329.7 °F at 760 mmHg (NTP, 1992)
    • 165.4 °C
    • 164 °C
    • 330 °F

    Flash point est.
    43.6 ˚C

    Flash point expt.

    • 129 °F (NTP, 1992)
    • 84 °C
    • 83.89 °C (CLOSED CUP)
    • 57.8 °C (Cleveland open-cup)
    • 54 °C
    • 129 °F

    Solubility expt.

    • less than 1 mg/mL at 72 °F (NTP, 1992)
    • SOL IN ALC; SOL IN ALL PROPORTIONS IN ACETONE, CARBON TETRACHLORIDE
    • Sol in benzene, chloroform
    • Sol in ether
    • Sol in n-heptane, ethanol
    • In water, 116 mg/l @ 25 °C
    • Solubility in water, g/100ml at 20 °C: 0.012 (very poor)
    • Insoluble

  • Synonyms

    • alpha-Methylstyrene
    • 98-83-9
    • 2-Phenylpropene
    • 2-Phenyl-1-propene
    • Isopropenylbenzene
    • Benzene, (1-methylethenyl)-
    • 2-Phenylpropylene
    • 1-Methyl-1-phenylethylene
    • prop-1-en-2-ylbenzene
    • alpha-Methylstyrol
    • (1-Methylethenyl)benzene
    • a-Methylstyrene
    • 1-Phenyl-1-methylethylene
    • ALPHA-METHYL STYRENE
    • beta-Phenylpropene
    • .alpha.-Methylstyrene
    • as-Methylphenylethylene
    • beta-Phenylpropylene
    • 1-Propene, 2-phenyl-
    • 1-Methyl-1-phenylethene
    • Isopropenyl-benzol
    • Isopropenil-benzolo
    • Isopropenyl-benzeen
    • 2-Phenyl-2-propene
    • alpha-methyl-styrene
    • .alpha.-Methylstyrol
    • 1-MethylethenylBenzine
    • .beta.-Phenylpropylene
    • 1-Methylethylenebenzene
    • alpha Methylstyrene
    • alpha-Methylstyreen
    • alpha-Methyl-styrol
    • alpha-Metil-stirolo
    • Styrene, .alpha.-methyl-
    • alpha-Methylstyreen [Dutch]
    • Isopropenyl-benzeen [Dutch]
    • Isopropenyl-benzol [German]
    • NSC 9400
    • Benzene, isopropenyl-
    • alpha-Methyl-styrol [German]
    • Isopropenil-benzolo [Italian]
    • alpha-Metil-stirolo [Italian]
    • CCRIS 6067
    • HSDB 196
    • Styrene, alpha-methyl-
    • alphamethylstyrene
    • (Prop-1-en-2-yl)benzene
    • isopropenyl-benzene
    • EINECS 202-705-0
    • UN2303
    • .beta.-Phenylpropene
    • Ortho brush killer a
    • .alpha.-Methylstyreen
    • DTXSID9025661
    • 2-phenyl-1-propylene
    • .alpha.-Metil-stirolo
    • AI3-18133
    • D46R9753IK
    • NSC-9400
    • 1-METHYLVINYL BENZENE
    • alpha-Methylstyrene (stabilized with TBC)
    • alpha-Methylstyrene, stabilized
    • DTXCID905661
    • CHEBI:35060
    • .ALPHA.-METHYLVINYLBENZENE
    • ALPHA-METHYLSTYRENE [HSDB]
    • EC 202-705-0
    • a-methyl styrene
    • isopropenylbenzol
    • ALPHA-METHYLSTYREEN (DUTCH)
    • ISOPROPENYL-BENZEEN (DUTCH)
    • ISOPROPENYL-BENZOL (GERMAN)
    • ALPHA-METHYL-STYROL (GERMAN)
    • ISOPROPENIL-BENZOLO (ITALIAN)
    • ALPHA-METIL-STIROLO (ITALIAN)
    • isopropenyl benzene
    • 2-phenyl propylene
    • alpha-Menthylstyrene
    • MFCD00008859
    • phenylpropylene
    • 2Phenylpropene
    • UNII-D46R9753IK
    • 2phenylpropylene
    • alphamethylstyrol
    • alphaMetilstirolo
    • betaPhenylpropene
    • 2Phenyl1propene
    • alphaMethylstyreen
    • Isopropenilbenzolo
    • Isopropenylbenzeen
    • 2-phenyl-propene
    • betaPhenylpropylene
    • alphamethyl styrene
    • 1Propene, 2phenyl
    • 1Methyl1phenylethene
    • 1MethylethenylBenzine
    • asMethylphenylethylene
    • 2-phenylprop-1-ene
    • 1Methylethylenebenzene
    • 1Methyl1phenylethylene
    • 1Phenyl1methylethylene
    • .alpha.-Methyl-styrol
    • alpha-methylvinylbenzene
    • ?-METHYLSTYROL
    • 1-Methylethenyl Benzine
    • alpha-Methyl styrene, fume
    • Benzene, (1methylethenyl)
    • alpha -Methylstyrene monomer
    • ghl.PD_Mitscher_leg0.286
    • MLS001055493
    • BIDD:ER0701
    • CHEMBL1344773
    • WLN: 1YR & U1
    • NSC9400
    • HMS3039N11
    • alpha-Methyl styrene (ACGIH:OSHA)
    • Tox21_200159
    • AKOS009031371
    • CS-W004075
    • FP76183
    • UN 2303
    • CAS-98-83-9
    • NCGC00090741-01
    • NCGC00090741-02
    • NCGC00257713-01
    • BS-22949
    • SMR000686066
    • 2-Phenyl-1-propene - stabilized with TBC

  • Applications

    alpha-METHYL STYRENE (AMS, CAS 98-83-9) is widely used as a co-monomer and chemical intermediate: it forms copolymers with acrylonitrile and styrene (e.g., AMSAN phases) to raise heat-deflection temperature, stiffness and gloss in engineering plastics such as ABS/SAN for electrical/electronic housings, automotive parts and appliances; it is polymerized/co-polymerized into low–molecular-weight AMS resins used as tackifiers and viscosity modifiers in hot-melt and pressure-sensitive adhesives, coatings and printing inks, improving adhesion, film hardness, heat resistance and gloss; it serves as a feedstock for p-cumylphenol and other alkylated phenols used in phenolic resins, as chain terminators for polycarbonate/epoxy and as stabilizer/antioxidant precursors; it can be hydrogenated back to cumene for phenol–acetone process balancing; AMS oligomers and dimers also find uses in rubber additives, plasticizer/intermediate streams and performance modifiers for coatings, varnishes and inks due to good compatibility with hydrocarbon and terpene resins.

  • Solubility @25˚C

    Solvent Solubility (g/L)
    ethanol 808.3
    methanol 485.22
    isopropanol 737.93
    water 0.36
    ethyl acetate 1720.05
    n-propanol 830.19
    acetone 1600.31
    n-butanol 919.93
    acetonitrile 1484.45
    DMF 1187.98
    toluene 967.22
    isobutanol 640.01
    1,4-dioxane 3043.09
    methyl acetate 1345.54
    THF 2860.92
    2-butanone 1627.84
    n-pentanol 682.47
    sec-butanol 822.25
    n-hexane 845.49
    ethylene glycol 80.23
    NMP 1213.47
    cyclohexane 611.17
    DMSO 1112.0
    n-butyl acetate 1931.99
    n-octanol 509.34
    chloroform 2626.49
    n-propyl acetate 1036.43
    acetic acid 407.37
    dichloromethane 2382.67
    cyclohexanone 1981.13
    propylene glycol 151.46
    isopropyl acetate 975.89
    DMAc 841.28
    2-ethoxyethanol 631.49
    isopentanol 750.95
    n-heptane 588.89
    ethyl formate 686.23
    1,2-dichloroethane 1714.57
    n-hexanol 1283.92
    2-methoxyethanol 774.73
    isobutyl acetate 712.19
    tetrachloromethane 630.89
    n-pentyl acetate 656.65
    transcutol 2081.99
    n-heptanol 515.53
    ethylbenzene 574.51
    MIBK 894.69
    2-propoxyethanol 1340.9
    tert-butanol 1005.1
    MTBE 1547.81
    2-butoxyethanol 620.19
    propionic acid 531.71
    o-xylene 484.78
    formic acid 64.86
    diethyl ether 2399.11
    m-xylene 591.24
    p-xylene 583.32
    chlorobenzene 943.7
    dimethyl carbonate 430.39
    n-octane 198.09
    formamide 136.71
    cyclopentanone 1900.0
    2-pentanone 1453.99
    anisole 987.12
    cyclopentyl methyl ether 1691.58
    gamma-butyrolactone 1551.32
    1-methoxy-2-propanol 812.31
    pyridine 1586.69
    3-pentanone 1208.08
    furfural 1097.03
    n-dodecane 127.14
    diethylene glycol 488.39
    diisopropyl ether 721.62
    tert-amyl alcohol 851.4
    acetylacetone 1107.47
    n-hexadecane 146.68
    acetophenone 632.0
    methyl propionate 1083.06
    isopentyl acetate 1283.02
    trichloroethylene 2195.05
    n-nonanol 447.06
    cyclohexanol 845.74
    benzyl alcohol 437.16
    2-ethylhexanol 905.8
    isooctanol 427.68
    dipropyl ether 1859.62
    1,2-dichlorobenzene 715.5
    ethyl lactate 285.74
    propylene carbonate 949.99
    n-methylformamide 469.61
    2-pentanol 782.16
    n-pentane 507.91
    1-propoxy-2-propanol 1098.16
    1-methoxy-2-propyl acetate 1006.96
    2-(2-methoxypropoxy) propanol 559.28
    mesitylene 386.96
    ε-caprolactone 1552.85
    p-cymene 346.22
    epichlorohydrin 2146.27
    1,1,1-trichloroethane 1842.84
    2-aminoethanol 209.53
    morpholine-4-carbaldehyde 1370.29
    sulfolane 1508.27
    2,2,4-trimethylpentane 178.6
    2-methyltetrahydrofuran 2421.13
    n-hexyl acetate 931.74
    isooctane 182.42
    2-(2-butoxyethoxy)ethanol 810.32
    sec-butyl acetate 695.59
    tert-butyl acetate 960.69
    decalin 295.94
    glycerin 175.33
    diglyme 1513.33
    acrylic acid 328.46
    isopropyl myristate 436.61
    n-butyric acid 969.6
    acetyl acetate 739.94
    di(2-ethylhexyl) phthalate 257.23
    ethyl propionate 910.96
    nitromethane 961.06
    1,2-diethoxyethane 1537.08
    benzonitrile 691.88
    trioctyl phosphate 221.82
    1-bromopropane 1625.93
    gamma-valerolactone 1779.99
    n-decanol 361.8
    triethyl phosphate 320.23
    4-methyl-2-pentanol 430.64
    propionitrile 1200.68
    vinylene carbonate 790.4
    1,1,2-trichlorotrifluoroethane 736.28
    DMS 569.22
    cumene 360.5
    2-octanol 374.59
    2-hexanone 1195.13
    octyl acetate 516.96
    limonene 602.43
    1,2-dimethoxyethane 1628.95
    ethyl orthosilicate 335.36
    tributyl phosphate 280.68
    diacetone alcohol 757.94
    N,N-dimethylaniline 571.0
    acrylonitrile 1010.7
    aniline 708.43
    1,3-propanediol 372.28
    bromobenzene 1120.23
    dibromomethane 1851.92
    1,1,2,2-tetrachloroethane 1840.83
    2-methyl-cyclohexyl acetate 636.52
    tetrabutyl urea 362.24
    diisobutyl methanol 458.28
    2-phenylethanol 636.56
    styrene 707.78
    dioctyl adipate 450.01
    dimethyl sulfate 547.59
    ethyl butyrate 1174.04
    methyl lactate 310.08
    butyl lactate 342.93
    diethyl carbonate 566.73
    propanediol butyl ether 401.45
    triethyl orthoformate 592.41
    p-tert-butyltoluene 336.14
    methyl 4-tert-butylbenzoate 513.51
    morpholine 2453.86
    tert-butylamine 739.81
    n-dodecanol 301.23
    dimethoxymethane 1182.63
    ethylene carbonate 792.38
    cyrene 411.0
    2-ethoxyethyl acetate 725.08
    2-ethylhexyl acetate 1079.56
    1,2,4-trichlorobenzene 763.39
    4-methylpyridine 1573.88
    dibutyl ether 1149.54
    2,6-dimethyl-4-heptanol 458.28
    DEF 1336.68
    dimethyl isosorbide 921.57
    tetrachloroethylene 1090.17
    eugenol 466.81
    triacetin 558.97
    span 80 497.23
    1,4-butanediol 163.3
    1,1-dichloroethane 1943.96
    2-methyl-1-pentanol 605.71
    methyl formate 394.79
    2-methyl-1-butanol 744.54
    n-decane 209.73
    butyronitrile 1298.48
    3,7-dimethyl-1-octanol 545.21
    1-chlorooctane 580.25
    1-chlorotetradecane 245.17
    n-nonane 239.99
    undecane 158.61
    tert-butylcyclohexane 305.4
    cyclooctane 277.94
    cyclopentanol 750.78
    tetrahydropyran 2952.38
    tert-amyl methyl ether 1092.27
    2,5,8-trioxanonane 934.73
    1-hexene 1587.31
    2-isopropoxyethanol 564.68
    2,2,2-trifluoroethanol 137.49
    methyl butyrate 1131.26

    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

Botanical

Name CAS Botanical Proportion
Alpinia japonica Alpinia japonica Miq., fam. Zingiberaceae 2.5%
Mandrake fruit (Israel) Mandragora officinarum L., fam. Solanaceae 0.03%