Isopropylate Triphenyl Phosphate (IPPP)

Isopropylate Triphenyl Phosphate (IPPP) ,CAS Number 68937-41-7.is not a single, pure compound but rather a mixture of phosphate esters. It is produced by reacting triphenyl phosphate with isopropyl alcohol, leading to a product where some of the phenyl groups are replaced by isopropyl groups.Its primary use is as a flame retardant and plasticizer in various polymer systems, most notably in engineering plastics.

Basic Information

Chemical Name: Isopropylate Triphenyl Phosphate

Synonyms: IPPP, Isopropylated Triphenyl Phosphate, Phosphoric Acid, Isopropylated Phenyl Esters

CAS Number: 68937-41-7

EC Number: 613-176-0

Chemical and Physical Properties

Since it is a mixture, the exact properties can vary between manufacturers. However, general characteristics include:

Appearance: Clear, viscous liquid (often colorless to pale yellow)

Odor: Mild, characteristic odor

Density: Approximately1.15 - 1.18 g/cm³

Viscosity: Low to medium viscosity liquid

Solubility: Soluble in most organic solvents (e.g., acetone, toluene, chloroform); insoluble in water.

Boiling Point: High (decomposes before boiling)

Flash Point: > 200 °C (392 °F) - High flash point makes it relatively safe to handle.

Primary Functions and Uses

IPPP is valued for its dual functionality:

1.Flame Retardant: It acts as a vapor-phase flame retardant. When the polymer is exposed to heat, IPPP decomposes and releases free radical quenchers into the flame zone, interrupting the combustion cycle. It is particularly effective in oxygen-containing polymers.

2.Plasticizer: It helps to improve the flexibility, processability, and workability of rigid polymers.

Common Applications

Engineering Plastics: This is its major application. It is extensively used in:

 Acrylonitrile Butadiene Styrene (ABS)

Polycarbonate (PC) / ABS Blends

Polyphenylene Oxide (PPO) / High Impact Polystyrene (HIPS) Blends

Polyvinyl Chloride (PVC)

Coatings and Resins: Used in some specialty coatings and adhesives that require flame retardancy.

Wire and Cable: Can be used in certain wire and cable insulation compounds.

Advantages

High Efficiency: Effective flame retardant at relatively low loadings.

Good Thermal Stability: Withstands the high processing temperatures of engineering plastics.

Good Compatibility: Miscible with many polymers and resins.

Low Volatility: Does not easily evaporate or "fog" out of the plastic over time.

Health, Safety

While generally considered stable under normal conditions, standard safety precautions for handling chemicals should be followed.

Personal Protective Equipment (PPE) such as safety glasses, gloves, and protective clothing is recommended to avoid skin and eye contact.

Use with adequate ventilation to avoid inhalation of mists or vapors, especially when heated.

Always consult the specific Safety Data Sheet (SDS) from the supplier for the most accurate and detailed handling and hazard information.

Summary

Isopropylate Triphenyl Phosphate (CAS 68937-41-7) is a widely used, high-performance flame retardant and plasticizer mixture, essential in the formulation of flame-retardant engineering plastics. While it offers excellent technical properties, its environmental profile is a key consideration, and its use is managed under various chemical regulatory frameworks worldwide.

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