Perovion TBPP L25-75 is a tert-butyl peroxypivalate formulation supplied as a 75% solution in isododecane. Perovion TBPP L25-75 is a peroxyester initiator used for the polymerization of ethylene, vinyl chloride, vinylidene chloride, and certain (meth)acrylate systems. Perovion TBPP L25-75 is widely used in low-density polyethylene production and in suspension polymerization of vinyl chloride at moderate to low process temperatures.
Perovion TBPP L25-75 Overview
Perovion TBPP L25-75 belongs to the peroxypivalate family of initiators, derived from pivalic acid esterified with tert-butyl hydroperoxide. The branched pivalate structure, with three methyl groups on the alpha carbon, gives this initiator a relatively fast decomposition rate at process-relevant temperatures, which supports efficient conversion in high-pressure ethylene and suspension vinyl chloride polymerization while keeping cycle times within typical production targets. Diluting the active peroxide to 75% in isododecane improves handling safety and metering accuracy in industrial polymerization plants.
Key Features
- Fast decomposition profile: The pivalate ester structure gives Perovion TBPP L25-75 efficient reactivity across a range of practical process temperatures.
- Suspension PVC compatibility: Perovion TBPP L25-75 initiates suspension polymerization of vinyl chloride in the 50°C to 70°C range, aligning with standard PVC resin production schedules used across a wide range of suspension polymerization plants.
- High-pressure ethylene process suitability: The formulation is effective in both autoclave and tubular high-pressure processes used for LDPE production.
- Blendable with other peroxides: Combining Perovion TBPP L25-75 with slower or faster initiators helps producers tune the overall reactivity profile of a polymerization batch, supporting consistent conversion across the entire reaction cycle.
- Isododecane carrier system: The solvent is chosen for solubility and compatibility with standard peroxide dosing equipment used across polymer plants, simplifying integration into existing process infrastructure.
Typical Applications
Perovion TBPP L25-75 is used as an initiator in the high-pressure polymerization of ethylene to produce low-density polyethylene, supporting both autoclave and tubular reactor configurations. Its reactivity profile allows plant operators to target specific molecular weight distribution and branching characteristics in the finished resin, which influence downstream film clarity and mechanical performance.
In vinyl chloride processing, Perovion TBPP L25-75 is used for suspension polymerization between roughly 50°C and 70°C, often in combination with other peroxides to achieve a broader reactivity spectrum across the batch cycle. The formulation is also used in select (meth)acrylate copolymerization systems where a fast-decomposing initiator is required at moderate temperature, offering an alternative to azo-type initiators in certain formulations.
Formulators typically qualify peroxypivalate initiators of this type against target conversion rate, resin molecular weight distribution, and residual monomer levels at the end of the polymerization cycle. Because reactivity is sensitive to dilution level, carrier solvent, and storage history, many producers run small-scale trial batches before committing a new initiator grade to full production volume.
Technical Specifications
- Chemical Type: tert-Butyl peroxypivalate
- Appearance: Colorless to slightly yellow liquid
- Active Content: 75% in isododecane
- Active Oxygen Content: To be confirmed based on the final specification sheet.
- Density at 20°C: To be confirmed based on the final specification sheet.
- Assay: To be confirmed based on the final specification sheet.
- CAS Number: 927-07-1
Thermal Stability
As with all organic peroxides, controlling exposure to heat, contamination, and mechanical shock during storage and handling is essential to maintaining safe and predictable decomposition behavior. Peroxypivalate esters generally decompose faster than many other peroxyester classes, making temperature control especially important throughout the supply chain, from manufacture through warehousing to final use on the production line.
- Organic peroxides are thermally unstable substances and must be handled with appropriate care at all times.
- Self-Accelerating Decomposition Temperature (SADT): To be confirmed based on the final specification sheet.
- Recommended maximum storage temperature: To be confirmed based on the final specification sheet.
As with other fast-decomposing peroxyester concentrates, temperature control during transport and warehousing is essential to maintaining product quality between manufacture and use. Producers should coordinate with logistics providers experienced in handling Class 5.2 organic peroxide shipments to ensure temperature-controlled transport is maintained throughout the supply chain.
Storage Recommendations
- Store in a cool, dry, well-ventilated area away from direct sunlight and other heat sources; temperature-controlled storage is typically required for this reactivity class.
- Keep containers tightly closed when not in use to prevent contamination and moisture ingress.
- Avoid contact with reducing agents, acids, alkalis, and heavy metal compounds, which can trigger premature decomposition.
- Recommended shelf life under proper storage conditions: To be confirmed based on the final specification sheet.
Packaging & Transport
- Standard Packaging: Plastic drums or IBC totes with temperature-controlled transport; typical net weights available on request based on customer volume and logistics requirements.
- UN Number: To be confirmed based on the final specification sheet.
- Hazard Class: Organic peroxide, Class 5.2
- Exact transport documentation, packing group, temperature control class, and regional classification: To be confirmed based on the final specification sheet.
In LDPE production, initiator reactivity directly affects polymer branching structure and molecular weight distribution, which ultimately shape the mechanical and optical properties of the finished film or molded product. In PVC suspension polymerization, the reactivity window of the initiator package influences particle morphology, porosity, and plasticizer absorption of the resulting resin. Selecting the right combination of initiators, including fast-decomposing peroxypivalates, is therefore an important part of process optimization for both polymer families.
Perovion TBPP L25-75: Safety & Handling
Perovion TBPP L25-75 should be handled in accordance with applicable safety procedures for organic peroxides. Given its fast decomposition profile, the product requires careful temperature control during storage, transport, and handling, along with avoidance of contact with incompatible materials such as reducing agents and heavy metal compounds, which can trigger rapid, uncontrolled decomposition. Operators should avoid contact with skin and eyes, and should ensure adequate ventilation wherever this initiator is mixed, transferred, or applied, since vapors and mist can be irritating with prolonged exposure.
Users are advised to review the Safety Data Sheet prior to handling and to implement appropriate personal protective equipment and engineering controls as specified therein. Safety Data Sheet and destination-compliant labeling information are available upon request. For related peroxide polymerization initiators used across similar LDPE and PVC production processes, see also Perovion DTMHP L36-75 and Perovion CPND L99-75.