Description

Didodecyl 4-[1-(4-Hydroxyphenyl)-1-Methylethyl]Phenyl Phosphite is a high-performance, sterically hindered phenolic phosphite antioxidant, widely recognized for its exceptional efficacy in polymer stabilization. This compound is engineered to provide superior protection against thermal degradation and oxidative stress during high-temperature polymer processing and long-term service. It is an essential additive for manufacturers in the plastics, synthetic fiber, and specialty elastomer industries seeking to enhance product durability and extend material lifespan.

Application

This advanced phosphite antioxidant is utilized across various high-demand industrial sectors for polymer stabilization and protection.

• Polyolefin Stabilization: Primary antioxidant for polypropylene (PP) and polyethylene (PE) resins to prevent thermal oxidation during extrusion, injection molding, and film blowing.
• Engineering Plastics: Critical additive in polycarbonate (PC), polyamide (PA), and polyester (PBT, PET) formulations to maintain molecular weight and color stability under processing heat.
• Synthetic Fibers: Used in the spin finish and polymer melt for nylon and polyester fibers to prevent yellowing and strength loss.
• Adhesives and Sealants: Enhances the thermal aging resistance of hot-melt adhesives and polyurethane-based sealant systems.
• Elastomers and Rubbers: Protects synthetic rubbers like SBR and EPDM from oxidative cross-linking and embrittlement.
• Polymer Masterbatches: A key active component in concentrated antioxidant and stabilizer blends for easy dispersion in final polymer compounds.

Basic Information

Product Name	Didodecyl 4-[1-(4-Hydroxyphenyl)-1-Methylethyl]Phenyl Phosphite
CAS No.	59189-82-1
Molecular Formula	C41H69O4P
Molecular Weight	656.96 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite; Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Antioxidant 626; Ultranox 626; ADK STAB PEP-36; Irgafos 126; Phosphite stabilizer 626; Bis(2,4-ditert-butylphenyl)pentaerythritol diphosphite
EINECS	261-647-9

Quality Control

Our production of Didodecyl 4-[1-(4-Hydroxyphenyl)-1-Methylethyl]Phenyl Phosphite adheres to stringent quality management systems. Every batch is subjected to comprehensive analytical testing, including assay, impurity profile, and physical property verification, to ensure it meets the exacting standards required for high-performance polymer applications. Certificates of Analysis (COA) documenting purity, phosphite content, and other critical parameters are available upon request to support your quality assurance protocols.

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). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept tightly sealed under an inert atmosphere (e.g., nitrogen) after initial opening to prevent moisture absorption and oxidation. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to standard
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 175 °C
Phosphorus Content	9.2 - 9.6 %
Acidity (as H3PO4)	≤ 0.1 %
Volatile Matter	≤ 0.5 %
Solution Color (APHA)	≤ 50

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