INTRODUCTION
Tris(2,4-di-tert-butylphenyl) phosphite (TDPP) often recognized commercially as Irgafos 168 is a high-performance organophosphorus compound primarily utilized as secondary antioxidant and processing stabilizer. Its characteristic to undergo metallation reaction and provide a cost-effective synthetic processes allows it to be useful in biaryl coupling reactions. It protects polymers which are prone to oxidation during the processing (comounding/palletizing, fabrication and recycling) from molecular weight change (by Chain scission or crosslinking) and prevents discolouration.
Manufacture
TDPP is prepared by reacting 2,4-di-tert-butylphenol with phosphorus trichloride (PCl₃) to form the phosphite ester, followed by purification to obtain Tris(2,4-di-tert-butylphenyl) phosphite.
| Synonyms | tris(2,4-di-tert-butylphenyl) phosphite |
| CAS no. | 31570-04-4 |
| EINECS no. | 250-709-6 |
| Molecular formula | C₄₂H₆₃O₃P |
| Molecular Weight | 646.9 |
| Structure |  |
Applications
TDPP is primarily used as a secondary antioxidant and processing stabilizer in polymers such as polyethylene, polypropylene, PVC, and engineering plastics. Its versatility across polymer systems enables a wide range of industrial applications, including the following:
| Polymer Stabilization |
| Reliable secondary antioxidant for high-temperature polymer processing of Polypropylene (PP) Polyethylene (HDPE, LDPE, LLDPE) Engineering plastics (ABS, polycarbonate blends) |
| Polyolefin Processing |
| Used as a stabilizer in Injection molding, blow molding & extrusion processes |
| Coatings, Adhesives & Sealants |
| Used in Industrial coatings Pressure-sensitive adhesives sealant formulations |
| Rubber & Elastomers |
| Synthetic rubber processing |
| Automotive rubber parts |
| Synergistic Use with Primary Antioxidants |
| Acts as performance multiplier |
SPECIFICATIONS
| Test | Unit | Specification |
|---|---|---|
| Appearance | – | White, free flowing powder /granules |
| Melting range | °C | 183 – 186 |
| Density (20⁰C) | g/ml | 1.03 |
| Bulk density | g/l | 480 – 570 |
| Typical Properties | ||
| Solubility @ 20°C : Solvents g/100g | ||
| Cyclohexane | g/100 g | 16 |
| Dichloromethane | g/100 g | 36 |
| Toluene | g/100 g | 30 |
| Chloroform | g/100 g | 36 |
PACKING
25kg Bag
STORAGE
Store at ambient conditions in tightly closed containers and in well ventilated area
REACH status
EU REACH Registered
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Tris(2,4-di-tert-butylphenyl) phosphite (TDPP) often recognized commercially as Irgafos 168 is a high-performance organophosphorus compound primarily utilized as secondary antioxidant and processing stabilizer. Its characteristic to undergo metallation reaction and provide a cost-effective synthetic processes allows it to be useful in biaryl coupling reactions.
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