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
ExSyn offers Tris(2,4-di-tert-butylphenyl) phosphite (TDPP) on commercial scales and welcomes enquiries. No matter the quantity you need, our exceptional quality and service will make ExSyn your supplier of choice! If you need any additional information or SDS, please contact us.
Today we announce that Exim is rebranding as ExSyn. We are presenting a new brand identity and website as a reflection of our relentless transformation over the course of 30 years serving the pharma and chemical industries. The new brand builds upon our core strengths as a sourcing company and captures our most essential duty: helping improve people’s health and lives.
p-tert-Butylphenol (PTBP), is an aromatic organic compound consists of a phenol ring substituted with a tert-butyl group at the para (4-) position, giving it improved thermal stability and hydrophobic properties compared to phenol. PTBP features significant hydrogen bonding capabilities, which enhance its solubility in organic solvents. PTBP is used primarily as an intermediate in the manufacturing of polycarbonate plastics, phenolic resins, and epoxy resins.
Yttrium oxide (Y2O3), also known as yttria, is an air-stable, odorless white powder. It is a highly stable, chemically inert ceramic with a very high melting point. It is insoluble in water but readily dissolves in most strong acids. Increasing the specific surface area and porosity of Y2O3 can further improve its relevant physical and chemical properties.
Under REACH Annex XVII Entry 78, the EU has banned the placing on the market of synthetic polymer microparticles (SPMs) unless a specific derogation applies. Derogations exist for essential uses such as: