Description

2-(tert-Butyl)-4-[1-[3-(tert-Butyl)-4-Hydroxyphenyl]-1-Methylethyl]Phenyl Bis(4-Nonylphenyl) Phosphite is a high-performance, sterically hindered phenolic phosphite antioxidant. This compound matters because it provides exceptional long-term thermal stability and color protection for polymers by effectively scavenging peroxy radicals and decomposing hydroperoxides. It is primarily needed by manufacturers in the plastics and polymer industries, especially for high-temperature processing applications where maintaining material integrity and appearance is critical.

Application

This phosphite antioxidant is engineered for demanding polymer stabilization applications, offering superior protection against thermal degradation and oxidative stress.

• Polyolefin Stabilization: A key additive for polypropylene (PP) and polyethylene (PE) to prevent yellowing and maintain mechanical properties during processing and end-use.
• Engineering Plastics: Provides essential thermal stability for high-performance resins such as polyamides (nylon), polyesters (PET, PBT), and polycarbonates.
• Styrenic Polymers: Used in HIPS (High Impact Polystyrene) and ABS (Acrylonitrile Butadiene Styrene) to protect against heat-induced degradation.
• Adhesives and Sealants: Enhances the shelf-life and performance stability of hot-melt and reactive adhesive formulations.
• Elastomers and Rubber Compounds: Protects synthetic rubbers from oxidative aging, preserving elasticity and tensile strength.
• Masterbatch Production: A highly effective component in antioxidant and stabilizer concentrate formulations for uniform dispersion in final polymers.
• Food Contact Packaging Materials: When used in compliant formulations, it helps stabilize polymers intended for packaging applications.
• Fiber and Filament: Stabilizes synthetic fibers against thermal degradation during high-speed melt-spinning processes.

Basic Information

Product Name	2-(tert-Butyl)-4-[1-[3-(tert-Butyl)-4-Hydroxyphenyl]-1-Methylethyl]Phenyl Bis(4-Nonylphenyl) Phosphite
CAS No.	20227-53-6
Molecular Formula	C55H81O4P
Molecular Weight	837.20 g/mol
Synonyms	Bis(4-nonylphenyl) [2-[1-[3-(tert-butyl)-4-hydroxyphenyl]-1-methylethyl]-5-tert-butylphenyl] phosphite; Tris(2,4-di-tert-butylphenyl) phosphite (Note: This is a common but distinct compound; included for clarity); Phosphite antioxidant 20227-53-6; Irgafos 168 (Note: Irgafos 168 is tris(2,4-di-tert-butylphenyl) phosphite, CAS 31570-04-4); Antioxidant TNPP (Note: TNPP is typically tris(nonylphenyl) phosphite); Sterically hindered phosphite stabilizer; Phenolic phosphite antioxidant; Polymer processing stabilizer.
EINECS	Contact for details

Quality Control

Our production of 2-(tert-Butyl)-4-[1-[3-(tert-Butyl)-4-Hydroxyphenyl]-1-Methylethyl]Phenyl Bis(4-Nonylphenyl) Phosphite adheres to a stringent quality management system. Every batch undergoes rigorous analytical testing to ensure consistent purity, performance, and compliance with industry specifications. Certificates of Analysis (COA) documenting key parameters such as assay, color, and hydrolyzable chloride content are available upon request. Our quality commitment supports your need for reliable and effective polymer stabilization.

Storage

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

Specification

Item	Specification
Appearance	White to off-white crystalline powder or flakes
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	180 - 185 °C
Volatile Matter	≤ 0.5 %
Hydrolyzable Chloride	≤ 10 ppm
Solution Color (APHA)	≤ 50

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