Description

Methyl 9-Octadecenyl Phosphite is a specialized organophosphorus compound widely utilized as a high-performance intermediate and additive. Its primary commercial value lies in its role as a key precursor for synthesizing advanced antioxidants and stabilizers, particularly in polymer and lubricant formulations. This chemical is essential for manufacturers in the plastics, synthetic lubricants, and specialty chemical industries seeking to enhance product durability and performance under oxidative stress.

Application

• Polymer Stabilizer Intermediate: A crucial building block for the synthesis of high-molecular-weight phosphite antioxidants used to protect polyolefins (PP, PE) and engineering plastics from thermal and oxidative degradation during processing and end-use.
• Lubricant & Grease Additive Precursor: Used to manufacture additives that improve the oxidation stability and anti-wear properties of synthetic engine oils, industrial lubricants, and greases.
• Synergistic Antioxidant Systems: Employed in combination with phenolic antioxidants to create synergistic stabilization packages for enhanced longevity of rubber and elastomeric products.
• Flame Retardant Synergist: Acts as a component in certain halogen-free flame retardant systems for plastics and textiles, contributing to char formation and reducing flammability.
• Chemical Intermediate: Serves as a versatile intermediate in organic synthesis for introducing phosphite functional groups into larger, more complex molecules for agrochemicals or pharmaceuticals.
• Metal Deactivator Component: Used in formulations designed to chelate metal ions in fuels and polymers, preventing metal-catalyzed oxidation reactions.

Basic Information

Product Name	Methyl 9-Octadecenyl Phosphite
CAS No.	109647-71-4
Molecular Formula	C19H39O3P
Molecular Weight	346.48 g/mol
Synonyms	Methyl Oleyl Phosphite; 9-Octadecenyl Methyl Phosphite; Methyl (9-Octadecenyl) Phosphite; Phosphorous Acid, Methyl 9-Octadecenyl Ester; Oleyl Methyl Phosphite; Methyl (Z)-9-Octadecenyl Phosphite; (9Z)-9-Octadecenyl Methyl Phosphite; (Z)-9-Octadecenyl Methyl Phosphite
EINECS	Contact for details

Quality Control

Our production of Methyl 9-Octadecenyl Phosphite adheres to stringent quality management protocols to ensure batch-to-batch consistency and high purity. Each lot is analyzed against established internal specifications using advanced analytical techniques such as GC, HPLC, and NMR. A comprehensive Certificate of Analysis (COA) detailing identity, purity, and impurity profiles is provided with every shipment to support your quality assurance and regulatory needs.

Storage

Preserve in a tightly closed container, protected from light. Store under an inert atmosphere (e.g., nitrogen or argon) in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its sensitivity to oxidation, containers should be kept tightly sealed after each use to minimize exposure to air.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms to structure
Assay (GC)	≥ 95.0%
Acid Value	≤ 1.0 mg KOH/g
Moisture (KF)	≤ 0.1%

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