Description

2,2'-[[2-[[(5,5-Dimethyl-1,3,2-Dioxaphosphorinan-2-Yl)Oxy]Methyl]-2-Ethylpropane-1,3-Diyl]Bis(Oxy)]Bis[5,5-Dimethyl-1,3,2-Dioxaphosphorinane] P,2,2'-Trioxide is a specialized organophosphorus compound with a complex cyclic structure, functioning as a high-performance phosphite antioxidant and process stabilizer. Its molecular architecture provides exceptional efficacy in scavenging free radicals and decomposing hydroperoxides, thereby preventing thermal and oxidative degradation in sensitive polymers. This compound is essential for manufacturers in the plastics, synthetic fiber, and specialty chemical industries seeking to enhance the longevity and color stability of their products under demanding processing conditions.

Application

• Polymer Stabilization: Primary application as a highly effective secondary antioxidant (phosphite) in polyolefins (PP, PE), polyesters (PET, PBT), and engineering plastics to prevent thermal degradation during high-temperature processing such as extrusion and injection molding.
• Color Retention Agent: Used to maintain polymer color and clarity by inhibiting the formation of colored oxidation products, critical for fibers, films, and clear packaging materials.
• Synergistic Formulations: Employed in combination with primary phenolic antioxidants to create robust stabilization systems that offer superior long-term thermal stability (LTS) and processing stability.
• Synthetic Fiber Production: Protects synthetic fibers like nylon and polyester from molecular weight degradation and yellowing during melt-spinning processes.
• Adhesive & Coating Resins: Enhances the heat stability of hot-melt adhesives, polyurethane systems, and solvent-based coatings, preventing gelation and viscosity increase.
• Rubber & Elastomer Processing: Acts as a stabilizer in synthetic rubber compounds to protect against scorching and maintain elasticity during vulcanization and end-use.
• Intermediate for Specialty Chemicals: Serves as a key building block or ligand precursor in the synthesis of more complex organophosphorus compounds for catalytic or flame-retardant applications.

Basic Information

Item	Details
Product Name	2,2'-[[2-[[(5,5-Dimethyl-1,3,2-Dioxaphosphorinan-2-Yl)Oxy]Methyl]-2-Ethylpropane-1,3-Diyl]Bis(Oxy)]Bis[5,5-Dimethyl-1,3,2-Dioxaphosphorinane] P,2,2'-Trioxide
CAS No.	83044-95-5
Molecular Formula	C22H44O9P3
Molecular Weight	554.48 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite (common industry name); Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Antioxidant 626; Ultranox 626; Irgafos 126; Doverphos S-9228; Phosphite stabilizer 626; Tris(2,4-di-tert-butylphenyl) phosphite (related compound); 1,3,2-Dioxaphosphorinane-based phosphite; Cyclic neopentyl tetrayl bis(2,4-di-tert-butylphenyl) phosphite
EINECS	Contact for details

Quality Control

Every batch of our phosphite antioxidant is manufactured under strict quality management systems and undergoes comprehensive analytical testing to ensure it meets the exacting standards required for polymer stabilization. We provide a detailed Certificate of Analysis (COA) with each shipment, which includes key parameters such as Assay, Phosphorus content, Hydrolyzable Chloride, and solution color. Our production adheres to ISO 9001 guidelines, and the product quality is consistent with major global specifications for polymer additives.

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 product is hygroscopic (moisture-sensitive); the container must be kept tightly sealed after each use to prevent absorption of atmospheric moisture, which can lead to hydrolysis and reduced efficacy. Keep away from heat sources and incompatible materials.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Phosphorus Content	16.5 - 17.0 %
Melting Point	175 - 185 °C
Volatile Matter	≤ 0.5 %
Solution Color (APHA)	≤ 50
Hydrolyzable Chloride	≤ 10 ppm

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