Description

Diethyl 3,5-Di-tert-Butyl-4-Hydroxybenzyl Phosphate is a high-performance organophosphorus compound, specifically a phosphite antioxidant, valued for its exceptional ability to inhibit oxidative degradation and thermal decomposition in polymers. Its primary function is to act as a highly effective secondary antioxidant, often used in synergy with primary phenolic antioxidants to provide comprehensive polymer stabilization. This product is essential for manufacturers in the plastics, synthetic rubber, and specialty chemical industries seeking to enhance the longevity and performance stability of their materials under demanding processing and end-use conditions.

Application

• Polymer Stabilization: Acts as a key secondary antioxidant (phosphite) in polyolefins (PP, PE), engineering plastics (ABS, PC), and synthetic rubbers to prevent chain scission and maintain molecular weight during high-temperature processing.
• Synergistic Formulations: Used in combination with primary phenolic antioxidants (e.g., Irganox 1010) to create robust stabilization packages that combat both radical-initiated oxidation and hydroperoxide decomposition.
• Color Retention: Helps prevent yellowing and discoloration in clear and pigmented polymers, making it critical for applications requiring long-term aesthetic quality.
• Thermal Processing Aid: Protects polymers during extrusion, injection molding, and other thermal manufacturing processes, reducing melt flow instability and improving processability.
• Adhesives and Sealants: Incorporated into hot-melt and reactive adhesive formulations to prevent oxidative cross-linking and viscosity increase, ensuring consistent application properties.
• Lubricant and Fuel Additive: Serves as an antioxidant additive in synthetic lubricants, greases, and industrial fuels to inhibit sludge formation and acid generation.

Basic Information

Product Name	Diethyl 3,5-Di-tert-Butyl-4-Hydroxybenzyl Phosphate
CAS No.	976-56-7
Molecular Formula	C19H33O5P
Molecular Weight	372.43 g/mol
Synonyms	Diethyl (3,5-di-tert-butyl-4-hydroxybenzyl)phosphonate; Phosphonic acid, P-[(3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl)methyl]-, diethyl ester; Ethyl di-tert-butylhydroxybenzylphosphonate; Antioxidant 1222; Irgafos 1222; Doverphos S-9228; Weston 618; 3,5-Di-tert-butyl-4-hydroxybenzylphosphonic acid diethyl ester
EINECS	213-574-9

Quality Control

Our production of Diethyl 3,5-Di-tert-Butyl-4-Hydroxybenzyl Phosphate adheres to stringent quality management protocols. Every batch is subjected to comprehensive analytical testing, including assay (HPLC), identity confirmation (IR, NMR), and impurity profiling, to ensure it meets precise specifications for antioxidant performance. A Certificate of Analysis (COA) detailing all test results is provided with each shipment. Our quality system is designed to support compliance with global regulatory frameworks, including REACH.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at ambient temperature (15-25°C). Keep away from heat, sparks, and open flame. Due to its light-sensitive nature, the container should be opaque or stored in darkness to maintain product integrity. Isolate from strong oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0 %
Melting Point	159 - 163 °C
Loss on Drying	≤ 0.5 %
Heavy Metals (as Pb)	≤ 10 ppm
Solution Color (5% in Toluene)	Colorless to pale yellow

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