Description

2,2'-[Butylidenebis[[2-(tert-Butyl)-5-Methyl-p-Phenylene]Oxy]]Bis[5,5-Dimethyl-1,3,2-Dioxaphosphorinane] is a high-performance, sterically hindered organophosphite antioxidant. This compound is specifically engineered to provide exceptional thermal and color stability to polymers during processing and long-term service. It is a critical additive for manufacturers in the plastics and polymer industries seeking to enhance product durability and performance. Its unique molecular structure offers superior hydrolytic stability compared to conventional phosphite antioxidants.

Application

This specialized organophosphite is a key additive in advanced polymer formulations, primarily functioning as a secondary antioxidant and process stabilizer.

• Polyolefin Stabilization: Essential for protecting polypropylene (PP) and polyethylene (PE) against thermal degradation during high-temperature extrusion, injection molding, and film blowing processes.
• Engineering Plastics: Used in formulations for polystyrene (PS), acrylonitrile butadiene styrene (ABS), and polycarbonate (PC) blends to prevent yellowing and maintain mechanical properties.
• Synthetic Fiber Production: Incorporated into polymer melts for fibers to ensure consistent viscosity and prevent chain scission during spinning.
• Adhesive and Sealant Formulations: Enhances the shelf-life and processing stability of hot-melt and reactive adhesive systems.
• Elastomer Compounding: Protects synthetic rubbers from oxidative degradation during mastication and curing.
• Masterbatch Production: A core component in antioxidant and stabilizer concentrate masterbatches for simplified dosing and uniform dispersion in final polymers.

Basic Information

Product Name	2,2'-[Butylidenebis[[2-(tert-Butyl)-5-Methyl-p-Phenylene]Oxy]]Bis[5,5-Dimethyl-1,3,2-Dioxaphosphorinane]
CAS No.	72018-03-2
Molecular Formula	C41H60O6P2
Molecular Weight	710.87 g/mol
Synonyms	Bis(2,4-di-tert-butylphenyl) pentaerythritol diphosphite; Pentaerythritol bis(2,4-di-tert-butylphenyl) phosphite; Bis(2,4-ditert-butylphenyl)pentaerythritol diphosphite; Antioxidant 626; Irgafos 126; ADK STAB PEP-36; Ultranox 626; Phosphite stabilizer 626
EINECS	Contact for details

Quality Control

Our production of 2,2'-[Butylidenebis[[2-(tert-Butyl)-5-Methyl-p-Phenylene]Oxy]]Bis[5,5-Dimethyl-1,3,2-Dioxaphosphorinane] adheres to a stringent quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for assay and purity, to ensure it meets precise specifications for critical parameters like phosphorus content, hydrolytic stability, and melting point. Certificates of Analysis (COA) documenting all test results are provided with each shipment. Our quality commitment supports compliance with relevant global standards for polymer additives.

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 moisture absorption, which can compromise product efficacy. Keep away from strong oxidizing agents.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	160 - 180 °C
Phosphorus Content	8.5 - 9.0 %
Acidity (as H3PO4)	≤ 0.1 %
Loss on Drying	≤ 0.5 %

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