Deltech Monomers para-tertiary-Butyl Styrene (TBS)

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Deltech para-tertiary-butyl Styrene (TBS) is a versatile substitute for styrene monomer, offering improved properties and fewer handling restrictions. It exhibits low volume shrinkage during polymerization, a high affinity for oils, high solvent receptivity, and improved water resistance in copolymers. From an environmental perspective, TBS has a low vapor pressure and high flash point, reducing emissions from storage or handling and minimizing the flammability hazard. Moreover, its low volatility decreases monomer fumes in the workplace, and it is not classified as a listed air toxic, thus avoiding many environmental use requirements.

Chemical Name: (1,1-Dimethylethyl)ethylbenzene, 3-tert-butyl-styrene, 4-tert-Butylstyrene

Chemical Family: Styrenics

Minimum Assay: 99.2 - 99.5 %

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Enhanced TDS

Identification & Functionality

Typical Isomer Distribution:
95% Para
5% Meta

Features & Benefits

Applications & Uses

  • In unsaturated polyester resin (UPR) applications such as SMC, BMC, lay-up, spray-up, casting and injection molding, TBS is an excellent diluent because of its low vapor pressure, high flash point, low shrinkage on polymerization and reduced exotherm. Higher operating temperatures are possible resulting in formulations with reduced viscosity, faster polymerization and cycle times, and the elimination of mold scum. TBS/UPR resins result in products with improved heat distortion and improved corrosion resistance.
  • TBS monomer can be polymerized by any of the conventional ways of initiation and in the presence of inert materials such as fillers, dyes, solvents, resins, rubbers and plasticizers. Unlike polystyrene, the homopolymer of TBS is soluble in hydrocarbons due to its aliphatic nature. TBS can be copolymerized with other monomers while requiring minor recipe adjustments when replacing styrene monomer on a mole-for-mole substitution.
  • TBS is the ideal monomer for use with alkyd and drying oil resins when greater aliphatic compatibility is desired. Also, the higher flash point of TBS permits higher operating temperatures resulting in shorter reaction times. In addition to improved aliphatic compatibility, TBS provides higher molar volume and improved thermal stability when used in manufacturing hydrocarbon resins.


ValueUnitsTest Method / Conditions
Density (at 25°C)0.884g.cm³
Surface Tension (at 25°C)29.0dynes-cm-¹
Volume Concentration on Polymerization (at 25°C)7.0%
PolymerNegativeASTM D-2121-84
Vapor Pressure (at 40°C)1.0mm.Hg
Vapor Pressure (at 80°C)6.0mm.Hg
Vapor Pressure (at 120°C)37.0mm.Hg
Vapor Pressure (at 160°C)77.0mm.Hg
ValueUnitsTest Method / Conditions
Molecular Weight160.26g/mol
Refractive Index (n25D)1.52
Minimum Assay99.2 - 99.5%
Boiling Point at 760 mmHg219° C
Freezing Point-38° C
Heat of Polymerization16-18Kcal mole-1
Copolymerization Q value1.39
Copolymerization e value-0.9
Inhibitor (p-tert butyl catechol)50ppmASTM D-4590
Vapor Pressure (at 40°C)1mmHg
Surface Tension (at 25°C)
ValueUnitsTest Method / Conditions
Isomer Distribution (Para)95.0%GC
Isomer Distribution (Meta)5.0%GC
Inhibitor TBC40 - 50ppmASTM D-2120-82

Regulatory & Compliance

Nothing contained herein is to be construed as a recommendation to use any product in conflict with any patent. Deltech LLC makes no warranties as to the fitness of merchantability of any product referred to, no guarantee of satisfactory results from reliance upon contained information or recommendation, and disclaims all liability for any resulting loss or damage.

Storage & Handling

Typical precautions in handling TBS monomer include wearing protective clothing, the use of impermeable gloves and use in a well ventilated area. Do not store in direct sunlight. Maintain storage temperature below 75oF if extended storage is required. TBS monomer contains the polymerization inhibitor tertiary butylcatechol (TBC) to reduce polymer formation during storage. For other product safety and toxicological information, please consult the Material Safety Data Sheets for TBS monomer.