Description

tert-BUTYL PEROXYPIVALATE (CAS No. 927-07-1) is a highly efficient organic peroxide initiator widely used in polymerization reactions. With the molecular formula C₉H₁₈O₃ and IUPAC name tert-butyl 2,2-dimethylpropaneperoxoate, this compound is a clear, colorless to pale yellow liquid with a characteristic odor. It is commonly supplied as a solution in aliphatic hydrocarbons (e.g., 75% active in odorless mineral spirits) for enhanced handling safety and stability. tert-BUTYL PEROXYPIVALATE is a thermally sensitive compound that decomposes exothermically to generate free radicals, making it ideal for initiating radical polymerization of ethylene, styrene, acrylates, and other monomers. It is particularly valued for its controlled decomposition rate at moderate temperatures (50-80°C), ensuring efficient initiation with minimal side reactions. Suitable for bulk, solution, and suspension polymerization processes, this peroxide is stored under refrigeration (2-8°C) to maintain stability and shipped with appropriate safety labeling. Always handle with proper personal protective equipment (PPE) and adhere to strict storage guidelines due to its flammable and reactive nature.

Properties

• CAS Number: 927-07-1
• Complexity: 160
• IUPAC Name: tert-butyl 2,2-dimethylpropaneperoxoate
• InChI: InChI=1S/C9H18O3/c1-8(2,3)7(10)11-12-9(4,5)6/h1-6H3
• InChI Key: OPQYOFWUFGEMRZ-UHFFFAOYSA-N
• Exact Mass: 174.125594432
• Molecular Formula: C9H18O3
• Molecular Weight: 174.24
• SMILES: CC(C)(C)C(=O)OOC(C)(C)C
• Topological: 35.5
• Monoisotopic Mass: 174.125594432
• Physical Description: Tert-butyl peroxypivalate is a colorless liquid that solidifies below -19 °C. Decomposes at 70 °C. Flammable and a dangerous fire risk. Heating may cause explosion. Used as a polymerization initiator.
• Synonyms: tert-Butyl peroxypivalate, t-Butyl peroxypivalate, tert-butyl 2,2-dimethylpropaneperoxoate, Trigonox 25-C75, PROPANEPEROXOIC ACID, 2,2-DIMETHYL-, 1,1-DIMETHYLETHYL ESTER, EINECS 213-147-2, t-butyl perpivalate, BRN 1704745, M0P448E3Y6, DTXSID2027339, EC 213-147-2, BUTYL PEROXYPIVALATE, TERT-, 4-02-00-00912 (Beilstein Handbook Reference), PIVALOYL TERT-BUTYL PEROXIDE, TERT-BUTYL TERT-VALERYL PEROXIDE, TERT-BUTYL 2,2-DIMETHYLPEROXYPROPIONATE, TERT-BUTYL PEROXYPIVALATE, (<= 77% IN SOLUTION), TERT-BUTYL PEROXYPIVALATE, [<= 77% IN SOLUTION], KAYAESTER P, PERBUTYL PV, KAYAESTER P 70, TRIGONOX 25C75, TRIGONOX 25W33, DTXCID807339, BUTYL PEROXYPIVALATE (TERTIARY), <=77% IN SOLUTION, 213-147-2, 927-07-1, Lupersol 11, Esperox 31M, tert-Butyl perpivalate, Peroxypivalic acid, tert-butyl ester, tert-Butyl trimethylperoxyacetate, Trigonox 25/75, tert.-butylperpivalat, SCHEMBL15165, UNII-M0P448E3Y6, AKOS006274845, NS00011497, 2,2-Dimethyl-propaneperoxoic acid tert-butyl ester

Application

tert-BUTYL PEROXYPIVALATE is primarily used as a free-radical initiator in the polymerization of ethylene, vinyl monomers, and acrylic esters. It is particularly effective in high-pressure LDPE (low-density polyethylene) production, where its moderate decomposition temperature ensures controlled reaction kinetics. The compound also finds application in the synthesis of polystyrene and acrylic resins, contributing to tailored molecular weights and polymer architectures. Additionally, it serves as a crosslinking agent for elastomers and thermosetting resins in specialty coatings and adhesives.

Safety and Hazards

GHS Hazard Statements

• H242 (91%): Heating may cause a fire [Danger Self-reactive substances and mixtures; Organic peroxides]
• H315 (100%): Causes skin irritation [Warning Skin corrosion/irritation]
• H317 (100%): May cause an allergic skin reaction [Warning Sensitization, Skin]
• H335 (100%): May cause respiratory irritation [Warning Specific target organ toxicity, single exposure; Respiratory tract irritation]
• H411 (64.4%): Toxic to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]
• H412 (35.6%): Harmful to aquatic life with long lasting effects [Hazardous to the aquatic environment, long-term hazard]

Precautionary Statements

• P210, P234, P235, P240, P261, P264, P271, P272, P273, P280, P302+P352, P304+P340, P319, P321, P332+P317, P333+P317, P362+P364, P370+P378, P391, P403, P403+P233, P405, P410, P411, P420, and P501

Hazard Classes and Categories

• Org. Perox. C (91%)
• Skin Irrit. 2 (100%)
• Skin Sens. 1 (100%)
• STOT SE 3 (100%)
• Aquatic Chronic 2 (64.4%)
• Aquatic Chronic 3 (35.6%)

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Disclaimer: Sold exclusively for laboratory research. Prohibited for commercial use, diagnostics, or human/animal applications. Buyers assume all compliance liability.