Aluminium hydroxybis[2,2'-methylen-bis(4,6-di-tert-butylphenyl)phosphate]
[CAS# 151841-65-5]

Identification

• Classification: Organic raw materials >> Organometallic compound >> Organic aluminum
• Name: Aluminium hydroxybis[2,2'-methylen-bis(4,6-di-tert-butylphenyl)phosphate]
• Synonyms: Bis(2,4,8,10-tetra-tert-butyl-6-hydroxy-12H-dibenzo[d,g][1,3,2]dioxaphosphocin-6-oxide) aluminum hydroxide
• Molecular Formula: C₅₈H₈₅AlO₉P₂
• Molecular Weight: 1015.22
• CAS Registry Number: 151841-65-5
• EC Number: 430-650-4
• SMILES: CC(C)(C)C1=CC2=C(C(=C1)C(C)(C)C)OP(=O)(OC3=C(C2)C=C(C=C3C(C)(C)C)C(C)(C)C)O[Al]OP4(=O)OC5=C(CC6=C(O4)C(=CC(=C6)C(C)(C)C)C(C)(C)C)C=C(C=C5C(C)(C)C)C(C)(C)C.O

Safety Data

• Hazard Symbols: GHS07;GHS09 Warning
• Risk Statements: H332-H411
• Safety Statements: P261-P271-P273-P304+P340-P317-P391-P501

Hazard Classification

Hazard	Class	Category Code	Hazard Statement
Acute toxicity	Acute Tox.	4	H332
Chronic hazardous to the aquatic environment	Aquatic Chronic	2	H411

• Transport Information: UN 3077

Discovery and Applications

Aluminium hydroxybis[2,2'-methylen-bis(4,6-di-tert-butylphenyl)phosphate] is a synthetic organophosphate compound with significant applications in industrial chemistry, particularly as an antioxidant additive. Its structure, featuring an aluminium core bonded to hydroxy and phosphate groups, confers exceptional thermal stability and oxidative resistance. These properties make it a valuable material in enhancing the longevity and performance of polymers and lubricants.

The discovery of aluminium hydroxybis[2,2'-methylen-bis(4,6-di-tert-butylphenyl)phosphate] is rooted in research focused on developing advanced antioxidants for polymers. During the mid-20th century, the rapid industrial adoption of plastics necessitated the creation of stabilizing agents that could counteract degradation caused by heat and oxidation. Researchers found that combining aluminium with sterically hindered phenols, such as 4,6-di-tert-butylphenyl groups, provided synergistic effects in stabilizing polymeric materials.

The compound’s primary application lies in the plastics industry, where it serves as a stabilizer for polyolefins, such as polyethylene and polypropylene. By scavenging free radicals and deactivating reactive oxygen species, it prevents oxidative degradation, preserving the mechanical properties and appearance of plastics exposed to high temperatures or prolonged use. Additionally, the compound’s compatibility with various processing methods, such as extrusion and molding, ensures its widespread use in manufacturing consumer goods, automotive components, and packaging materials.

In the lubricant industry, aluminium hydroxybis[2,2'-methylen-bis(4,6-di-tert-butylphenyl)phosphate] functions as an additive to improve the oxidative stability of oils. It is particularly useful in high-performance applications, such as in automotive and aerospace engines, where lubricants must withstand extreme temperatures and stresses without breaking down. The compound’s ability to form a protective layer on metal surfaces further enhances its value, reducing wear and extending equipment life.

Ongoing research has explored its potential in advanced materials, including composites and nanostructures. Its role in stabilizing polymers against photodegradation is of particular interest, enabling the development of materials suited for outdoor or high-UV environments. Furthermore, studies have investigated its environmental profile, focusing on optimizing formulations to minimize ecological impact while maintaining efficacy.

Despite its benefits, the production and use of aluminium hydroxybis[2,2'-methylen-bis(4,6-di-tert-butylphenyl)phosphate] require adherence to safety and environmental standards. Proper handling during manufacturing and disposal ensures minimal release into ecosystems, aligning with the growing emphasis on sustainable chemical practices.

References

2018. The Chemical and Products Database, a resource for exposure-relevant data on chemicals in consumer products. Scientific Data, 5, 180125.
DOI: 10.1038/sdata.2018.125