Description

Tris(2,4-Ditertbutyl-5-Methylphenyl) Phosphite is a high-performance organophosphite antioxidant widely used in polymer stabilization. This compound is critical for preventing oxidative degradation and maintaining the physical properties of polymers during high-temperature processing and long-term use. It is an essential additive for manufacturers in the plastics, synthetic fiber, and elastomer industries who require reliable protection against thermal aging and color formation.

Application

This phosphite antioxidant is utilized in a variety of polymer systems to enhance stability and longevity. Key applications include:

• Polyolefin Stabilization: Primary antioxidant for polypropylene (PP) and polyethylene (PE) to prevent melt flow degradation and yellowing during extrusion and molding.
• Engineering Plastics: Co-stabilizer in polymers like polycarbonate (PC), polyamides (nylon), and polyesters (PET, PBT) to protect against thermal-oxidative stress.
• Synthetic Fibers: Additive in fiber-grade polymers to maintain tensile strength and color stability during high-speed spinning and drawing processes.
• Elastomers and Rubbers: Used in styrenic block copolymers and other elastomers to prevent chain scission and crosslinking caused by heat and oxygen.
• Adhesives and Sealants: Incorporated to preserve the integrity and adhesive properties of hot-melt and reactive polymer-based formulations.
• Masterbatch Production: A key active component in antioxidant and stabilizer concentrates for easy dispersion in final polymer compounds.

Basic Information

Product Name	Tris(2,4-Ditertbutyl-5-Methylphenyl) Phosphite
CAS No.	68922-23-6
Molecular Formula	C45H69O3P
Molecular Weight	689.00 g/mol
Synonyms	2,4-Di-tert-butyl-5-methylphenyl phosphite (3:1); Tris(2,4-di-tert-butylphenyl) phosphite (with methyl substitution variant); Phosphorous acid, tris(2,4-bis(1,1-dimethylethyl)-5-methylphenyl) ester; Antioxidant 168 (common industry name); Irgafos 168 (trade name); Alkanox 240 (trade name); Doverphos S-686 (trade name); TNPP analog (higher molecular weight variant)
EINECS	Contact for details

Quality Control

Our production of Tris(2,4-Ditertbutyl-5-Methylphenyl) Phosphite adheres to stringent quality management protocols. Every batch is tested to ensure high purity, consistent performance, and compliance with relevant industry standards. Certificates of Analysis (COA) documenting key parameters such as assay, melting point, and specific impurity levels are available upon request to support your quality assurance and regulatory needs.

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). This product is hygroscopic (moisture-sensitive) and should be kept under dry conditions to prevent hydrolysis. It is also easily oxidized and should be stored under an inert atmosphere (e.g., nitrogen) for long-term preservation of efficacy.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	175 - 185 °C
Volatile Matter	≤ 0.5 %
Acidity (as H3PO4)	≤ 0.1 %
2,4-Di-tert-butylphenol Content	≤ 0.5 %

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