Tert-Butyl peroxybenzoate (TBPB) CAS 614-45-9

Introduction to TBPB

Tert-Butyl peroxybenzoate is an organic peroxy ester formed from benzoic acid and tert-butyl hydroperoxide. Its peroxide functional group decomposes thermally to release free radicals for initiation reactions. It appears as a colorless to pale yellow transparent liquid at room temperature, with a mild aromatic odor. It is miscible with most organic solvents and insoluble in water.

Industrial production uses controlled esterification and purification to deliver precise active oxygen content. The compound decomposes gradually at elevated temperatures, supporting uniform polymerization and crosslinking across resin, monomer and rubber systems.

TBPB Chemical & Physical Properties

Applications of TBPB

Unsaturated polyester curing: Serves as a medium-temperature curing initiator for unsaturated polyester systems. It supports controlled gel and cure profiles for sheet molding compound, resin transfer molding and hand lay-up fabrication.

Vinyl polymerization: Acts as a free radical initiator for styrene, acrylate and other vinyl monomer polymerization. It works across bulk, suspension and emulsion processes with predictable reaction rates.

Rubber vulcanization: Functions as a crosslinking agent for specialty rubber and elastomer compounds, improving crosslink density and final mechanical properties.

Polymer modification: Used as a grafting initiator for polyolefin modification and functional polymer synthesis, enabling controlled molecular weight and property tuning.

Storage & Safety Precautions for TBPB

• Store in cool, well-ventilated areas below 30 °C. Keep away from heat sources, open flame and direct sunlight to prevent premature decomposition and active oxygen loss.
• Separate from reducing agents, strong acids, bases and metal compounds. Contact with promoters or contaminants may trigger rapid decomposition and pressure buildup.
• Wear chemical splash goggles, nitrile gloves and protective clothing during handling. Avoid direct skin and eye contact and inhalation of vapors.

TBPB FAQ

Q: What is Tert-Butyl peroxybenzoate (TBPB) mainly used for?

A: It cures unsaturated polyesters, initiates vinyl polymerization, crosslinks rubber and modifies polymers via controlled free radical release.

Q: What storage conditions does TBPB require?

A: Store below 30 °C in cool dark areas. Keep away from heat, flame and reactive contaminants to prevent decomposition.

Q: Is TBPB soluble in water?

A: No. It is insoluble in water and fully miscible with most organic solvents and resin systems.