Description

2-[2,4-Bis(tert-Butyl)Phenoxy]-5,5-Dimethyl-1,3,2-Dioxaphosphorinane is a high-performance organophosphorus compound, specifically a cyclic phosphonite, valued for its role as a highly effective secondary antioxidant and process stabilizer in polymer chemistry. Its primary commercial value lies in its ability to prevent thermal and oxidative degradation during the processing and long-term service life of polymers, thereby enhancing product durability and performance. This compound is essential for manufacturers in the plastics, synthetic fiber, and elastomer industries seeking to improve the stability and color retention of their materials.

Application

• Polymer Stabilization: Acts as a secondary antioxidant (phosphite) in polyolefins (PP, PE), polyesters, and engineering plastics to prevent thermal degradation during high-temperature processing such as extrusion and injection molding.
• Color Retention: Effectively inhibits the formation of colored oxidation products in polymers, maintaining clarity and aesthetic quality in finished goods.
• Synergistic Formulations: Used in combination with primary phenolic antioxidants to provide comprehensive stabilization, significantly extending the service life of polymer products.
• Elastomer Protection: Applied in synthetic rubber and thermoplastic elastomers to protect against heat and oxygen-induced cross-linking or chain scission.
• Adhesive & Sealant Manufacturing: Enhances the thermal stability of hot-melt adhesives and other polymer-based sealants during production and application.
• Fiber Production: Stabilizes synthetic fibers like polypropylene and polyester against molecular weight breakdown during melt-spinning processes.

Basic Information

Product Name	2-[2,4-Bis(tert-Butyl)Phenoxy]-5,5-Dimethyl-1,3,2-Dioxaphosphorinane
CAS No.	71519-95-4
Molecular Formula	C19H31O3P
Molecular Weight	338.42 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (common trade name); Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Phosphorous acid, cyclic 2,4-bis(1,1-dimethylethyl)phenyl pentaerythritol diester; Antioxidant 626; Ultranox 626; Irgafos 126; ADK STAB PEP-36; Hostanox PAR 24; Phosphite stabilizer 626; Cyclic neopentanetetrayl bis(2,4-di-tert-butylphenyl) ester of phosphorous acid
EINECS	Contact for details

Quality Control

Our production of 2-[2,4-Bis(tert-Butyl)Phenoxy]-5,5-Dimethyl-1,3,2-Dioxaphosphorinane adheres to a stringent quality management system to ensure batch-to-batch consistency and high purity. The product is manufactured and tested in compliance with relevant industry standards for polymer additives. Certificates of Analysis (COA) detailing key parameters such as assay, phosphite content, melting point, and acidity are provided with each shipment to guarantee it meets your specific technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed after initial opening to prevent degradation from atmospheric moisture. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 175 °C
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Phosphorus Content	8.9 - 9.3 %
Solution Color (APHA)	≤ 50

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