Description

Bis(2,4-Di-tert-Butylphenyl)Phenyl Phosphonite is a high-performance organophosphorus antioxidant and secondary stabilizer widely used in polymer processing. Its primary value lies in its exceptional ability to decompose hydroperoxides, effectively preventing the oxidative degradation of polymers and significantly extending their service life. This compound is essential for manufacturers in the plastics, synthetic fiber, and elastomer industries who require robust stabilization solutions for sensitive materials like polyolefins and engineering plastics.

Application

• Polymer Stabilization: Acts as a highly effective secondary antioxidant (hydroperoxide decomposer) in polypropylene (PP), polyethylene (PE), and other polyolefins to prevent thermal and oxidative degradation during processing and end-use.
• Synergistic Formulations: Used in combination with primary phenolic antioxidants (e.g., hindered phenols) to create synergistic stabilization systems, offering superior long-term thermal stability for plastics.
• Engineering Plastics: Provides critical stabilization for high-performance engineering plastics such as polyamides (nylon), polyesters (PET, PBT), and styrenics, protecting against color formation and loss of mechanical properties.
• Synthetic Fibers: Incorporated into the spin finish or polymer matrix for synthetic fibers to prevent yellowing and maintain tensile strength during high-temperature extrusion and processing.
• Elastomer Protection: Used in the stabilization of synthetic rubbers and thermoplastic elastomers (TPEs) to enhance resistance to heat aging and environmental stress cracking.
• Adhesive & Sealant Formulations: Enhances the shelf-life and thermal stability of hot-melt adhesives, polyurethane systems, and other sealants by preventing oxidative cross-linking or degradation.
• Masterbatch Production: A key active component in antioxidant and stabilizer concentrate masterbatches, providing uniform dispersion and ease of handling for compounders.
• Lubricant & Fuel Additive Intermediate: Serves as a chemical intermediate in the synthesis of other specialty additives for lubricants and fuels.

Basic Information

Product Name	Bis(2,4-Di-tert-Butylphenyl)Phenyl Phosphonite
CAS No.	70146-21-3
Molecular Formula	C34H47O2P
Molecular Weight	518.71 g/mol
Synonyms	Phenyl Bis(2,4-di-tert-butylphenyl) Phosphite; Bis(2,4-di-tert-butylphenyl) Phenyl Phosphite; Phosphorous Acid, P,P-Bis(2,4-bis(1,1-dimethylethyl)phenyl) P-Phenyl Ester; Irgafos® 2020; Alkanox® 240; Doverphos® S-9228; Ultranox® 626; Hostanox® PAR 24; Antioxidant 2020; 2,4-Bis(1,1-dimethylethyl)phenyl Phosphite (3:1)
EINECS	Contact for details

Quality Control

Our Bis(2,4-Di-tert-Butylphenyl)Phenyl Phosphonite is manufactured under a strict quality management system. Each batch undergoes rigorous analytical testing to ensure it meets the high-purity standards required for sensitive polymer applications. We provide comprehensive Certificates of Analysis (COA) with key parameters including assay, melting point, and specific impurity profiles. Our quality commitment aligns with ISO 9001 principles, and we can support compliance with relevant global regulatory frameworks such as REACH and FDA indirect food contact regulations where applicable.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and easily oxidized; therefore, containers must be kept tightly sealed under an inert atmosphere (e.g., nitrogen) after opening to prevent degradation. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0 %
Melting Point	175 - 185 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.1 %
Solution Color (APHA)	≤ 50

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.